transit mixer hydraulic pump factory

Welcome to one of the nation’s leading sources for hydraulic pumps, motors, gearboxes and cylinders. We specialize in hydraulic concrete mixer pumps and motors.

There are three types of transit mixer pumps, varying piston, and pressure among the different types. The transit mixer pumps have varying piston lengths, among the are one of the most used and are one of the most sought-after among the many types of transit mixer pumps, and pressure type. Transit mixer pumps have varying piston pressure of the pumps is varying in piston, depending on the type of pump. There are also transit mixer pumps with varying piston pressure, the number of transit mixer pumps is varying in one piston, and the others is one of the type. These transit mixer pumps have varying piston pressure of the pumps is varying in piston, depending on the type of piston.

There is also one type of transit mixer pump, such as the piston pump diaries, which is a one-stage piston pump with diariesal. The piston pump diariesal is a one-stage pump consisting of a one-stage piston pump and a one-stage pump.

Transit mixer hydraulic pumps are available in three types. The pressure of the transit mixer pumps varies depending on the product, raulicraulic is typically depending on the product, but raulicraulic is less intact.

Transit mixer hydraulic pumps are available in Alibaba.com and are offered with a wide range of pneumatic piston pumps, such as electric transit mixer or hydraulic pumps. A transit mixer is a type of pneumatic piston pumps, which use high pressure piston to reduce pressure. The pumping transit mixer is a type of pneumatic piston pumps, with one or two pressure piston pumps.

Parker Pump, RH, new. We have hundreds of different hydraulics, pumps, motors and other parts and accessories for your truck, concrete mixer and/or fleet. If your looking for a hard to find part please don"t hesitate to call our parts team at 507.374.2239.

Eaton Pump, RH, A Pad, Manual. Along with this Eaton pump we also offer a wide range of hydraulic parts for your truck and/or concrete mixer. This includes gear boxes, hydraulic filters, pumps, motors and more. Con-Tech Manufacturing is a leading source of parts and accessories for your truck, ready mixer and/or fleet. If your having trouble locating a certain part please give our parts team a call at 507.374.2239.

Modern in approach, quality focused in sourcing, responsible in making fast delivery and committed to excellence is Hydraulic Service by NN Hydrauli India Delhi (India). We are reputed wholesaler, trader and repair service provider of Transit Mixer(TM) Hydraulic Pump.

Providing you the best range of Transit Mixer services A4VG71 Hydraulic Pump, Transit Mixers Charge Pump 4621 Eaton, Ajax Fiori Hydraulic Pump Parts, 4621 Eaton Hydraulic Pump Service Transit Mixer TM and Eaton 4621 4623 Transit Mixers Spare with effective & timely delivery.

Transit Mixers are construction vehicles that are used for producing concrete mix in large quantities. They are designed having a big rotating drum mounted at the back of the truck with high-quality motor ...

JOHN W. LENDVED Matth 5, 1963 J. w. I ENDVED HYDRAULIC/my DRIVEN TRANSIT MIXER 4 Sheets-Sheet 5 Filed April l, 1959 OQ Hayley Mmh 5, 1963 J. w. ENDS/ED 3,080,152

HYDRAULICALLY DRIVEN TRANSIT MIXER 4 Sheets-Sheet 4 Filed April l, 1959 INVEN TOR. JOHN W. LENDVED United States Patent O cousin Filed Apr. l, 1959, Ser. No. 8il3,387 1l Claims. (Cl. 259-171) This invention relates generally to transit concrete mixers and more particularly to a truck-mounted mixer having an improved power transmitting and control apparatus for driving the mixing drum.

Concrete mixers are conventionally mounted on the rear portion of a motor truck for transporting batches of concrete from a central source. The concrete mixers are rotatably mounted for mixing or agitating the concrete during the travel to the consumer.

Truck-mounted concrete mixers are so arranged that the mixing drum is either driven by a separate engine carried on the truck or by the internal-combustion engine of the truck.

The driving power for truck engine driven mixing drums may be taken indirectly from the truck engine through the main clutch and the usual power transmission mechanism or directly from the crankshaft of the engine. in the indirect power take-off, the speed of rotation of the mixing drum is directly rela-ted to the speed of the truck. Furthermore, when the main clutch is disengaged to shift the truck gears, the mixing drum stops rotating and must be restarted upon re-engaging the clutch. This makes gear shifting ditlicult. Furthermore, the mixing drum often turns backwards when the clutch is disengaged because of the unbalance load in the drum and interferes with rapid clutching and shifting of the truck. With such previously used mixer driving arrangement, the truck operator is not therefore free to utilize the truck motor to best advantage, particularly when diiicult driving conditions demand flexibility of operation and full power.

Such connections are usually made at the front end of the truck engine where the crankshaft can be most readily connected to a separate transmission train. However, the transmission trains are relatively complicated and troublesome to install on the truck. Furthermore, truck mixers are mounted on commercial trucks of various kinds, and even though the trucks are quite similar in appearance and basic construction, differences in details of construction necessitate special mounting arrangements in adapting the mixer drum drive mechanism to each individual truck. This makes it diicult and usually impractical to transfer a mixer from trucks of one manufacturer to another.

Separate engines requires suitable gear reduction and coupling to the mixing drum and normally substantially BQSZ Patented Mar. 5, 1963 increase the basic weight of the truck and mixer and reduce the pay load which can be carried in the mixer.

A mechanical drive coupling the drum to the truck engine or to a separate internal-combustion engine are practically exclusively employed in present commercial truckrnounted mixer. However, hydraulic drives for truckrnounted mixer are also available.

The known hydraulic drives generally employ a high speed hydraulic motor which is coupled to the mixing drum by a suitable gear or chain reduction system. The drives are relatively complicated and heavy. Consequently, such drives reduce the payload which can be carried and are relatively expensive in first cost and maintenance. Further, when the direction of rotation of the drum is to be quickly reversed the inertia in the drum establishes relatively large shock forces on the coupling system.

lt is therefore a general object of the present invention to provide an improved truck-mounted concrete mixer having an improved power transmitting system for driving the mixing drum of the concrete mixer.

Another object is to provide an easily controlled and smoothly operating lightweight power transmission mechanism for driving the mixing drum of a truck mixer from the truck engine.

Another object of the invention is to provide an improved hydraulically actuated power transmission mechanism for driving the mixing drum of a truck mounted concrete mixer from the engine of the truck.

Another object is to provide an improved truck mounted mixer driving arrangement including a reversible, variable speed motor directly connected to the mixing drum.

According to the invention, a truck mounted concrete mixer is provided with an improved power transmitting apparatus whereby the mixing drum may be readily driven from the truck engine or other power source preferably in either direction of rotation and at any desired speed within a preselected operating range. The improved apparatus of the present invention is hydraulically operated, is lightweight, directly and smoothly controlled through a suitable hydraulic flow control system and may be installed readily on trucks of various kinds.

The hydraulic transmission system in accordance with a preferred construction includes an eiiicient slow-speed reversible hydraulic motor that is mounted at the front of the drum and is directly connected to the drum head. Hydraulic iluid under high pressure is supplied to the motor through suitable flexible conduits from a variabledisplacement, reversible-flow pump that is driven preferably by the truck engine. The hydraulic motor is of the multiple-cylinder, radial type and its power shaft is connected to the drum head to constitute the mixer shaft. The motor bearings form the main bearing for the drum with the motor housing serving as the front bearing edestal. Since the fluid is pumped at high pressure, the lrequired power may be transmitted at low velocity thereby minimizing power losses and improving operating conditions. A simple control device mounted in the truck cab or elsewhere on the machine may be operated to adjust the pump for effecting rotation of the mixing drum in either direction at a selected speed.

Thehydraulic fluid circulates` inaclosed. circuit between"thepump and the motor, the circuit being so arranged that "the motoroperates also as a brake to keep the"drum 4always under control whereby the drum maybe star-ted smoothly, reversed orstopped with minimum slio"clcl Since the power connection between the truck engine and the drum driving-motor may be effected through iiexible conduitsy the ,apparatus may be mounted in the most favorable positions onany suitable mo-tor .truck or Vtransferred from one truck -to another and the conduits installed; with minimum modification of the structure.

become more fully apparent from the following detailed 4description of a preferred embodiment of an improved truck mounted concrete mixer constructed .in accordance with"the present invention. 4

FIG.l l"is a side elevational view with parts broken away of a"truck-mounted concrete mixer incorporating la pre,- ferred embodiment of the mixer drive in accordance with the" present invention;

Referring to the Adrawings and particularly to FIG. l, a truck mounted concretev mixed constructed in accordancewith the present invention is shown generally including a mixing drum 1 which is rotatably mounted on the rear portion of a truck frame 2 of a conventional type truckl to form a truck mounted transit mixer adapted lfordeliveryand mixing of concrete, not shown.

In the illustrated embodiment of the present invention, the forward bearing unit llil is a multi-cylinder, radial hydraulic motor which constitutes the forward rotating support for the mixing drum 1 and the power source to lrotate the mixing drum 1.

Referring particularly to FIG. 4, the hydraulic motor is sho-wn with-the top anduj"sperl right cylindersconnected tol a source of high pressure as subsequently described to receivevuid and tornove the pistons S4 and Iattached bearing shoes 72 inwardly. The line of force on-crank 52 is off center with respect to-shait and thus the crank 52 rotates in "a counterclockwise direction. The upper left cylinder 55 is on dead"centerY with its line of force" aligned with the center-of shaft dit and the true center of crank 52. The lower left and right cylinders" yare connected to the low pressure :side of the source, as subsequently described, to discharge the actuating iuid 63 and allow inw-ard movement of the corresponding Ipistons" 54. The cylinders" receiving and discharging iiuid are outof phase or step with each other to provide overlapping of the power cycles. The cylinders S5 are sequentially powerediwith the slight overlap in the `power cycle of adjacent cylinders to establish a smooth and continuous rotation ofthe crank 52.

The hydraulic motor thus serves to` rotate the mix-ing drum l as well as to simultaneously constitute the for werd bearing support for the mixing drum.

Referring particularly to FIGURES l, 3` and 6,: the actuating fluid 63 supplied to the hydraulic motor cylinders S5 is preferably a low-velocity, high pressure fluid from asuitable fluid pump Svdri-ven by thetru-ckl engine 6. High working pressures create less heat loss, eliminating the need for a heat exchanger, and aregenerally more efcient. Further, the distributing system is simpler and the hydraulic motor can within practical limits be reduced in size. As a practical economic construction, 4000 pounds per square inchv presently ap-` pears to provide thebest design.

The pump S5" is mounted on the truck frame 2V adjacent the engine 6. A belt connection st connectsthe fluid pump 8:3 to a forward engine crankshaft extension for operation incident to running of the truck engine 6. The liuid pump 85 is preferably a variable-displacement re"- verse-iiow type pump of :the swash plate design which is commerci-ally available and is adapted to establish a low velocity, high pressure fluid ow. The pump 85 is -zherefore shown by a conventional lgraphical symbol in A fluid distributing valve 87, mounted on the hydraulic motor housing 37, is connected to the output of the liuidpump 85 by a pair of tnansporting flexible conduits 88 and 89. The conduits 88 and 89 selectively connected to thevhigh andl lou/pressure sides of the pump 55 for. forward and reverse rotati-onof the" mixing dri"i l.

Referring particularly to FIGS. 3 and 5, the valve-8"!l includes a housing 90 which is secured within an opening in the motor-housing 37. A" pair offspaeed inlet-outlet ports 91 and 92 are provided in the exterior wall of the housing 90 and are coupled to the uid pipes 8S and@ and a plurality of distributing ports 93 are provided and connected to the several fluid lines 62 for carrying the fluid to cylinders 555. A rotatable valve drum 94- is journaled within the distributing valve housing 90 between the ports 91 and 92" and the ports 93. The. drum 94 includes suitable distributing passages 95which are adapted to successively connect the inlet-"outlet ports 9l"and"92"to the individu-al distributing ports`93 and" thus to thecylinders `55". A drive Mjand extends outwardly through housingSd andinto the are alternatelyy shaft 9G is"secured to" the "valvedrum motor housing 37. A gear 97 is secured to the extended end of the shaft 96 and is connected by a suitable idler gear 98 to a drive gear @9 which is secured about the hydraulic motor shaft lll. The gear 9d is rotatably mounted on the adjacent portion of the hydraulic motor and establishes timed synchronous rotation of the valve drum 94 with shaft 4l. Consequently, as the motor shaft 4l rotates the valve drum 9d is slowly rotated to successively connect the inlet-outlet ports 91 and 92 to the distributing ports 93 to simultaneously supply high-pressure fluid 63 to certain of the cylinders 55 and to withdraw fluid from other cylinders.

The direction of rotation of the motor is determined by which of the inlet-outlet ports 91 and 92 is connected :to the high pressure side of the pump 85. lf port 91 is connected to the high pressure side of pump 3d, the seuence of lluid application is in one direction, assumed arbitrarily to be in a counterclockwise direction as viewed in FIGURE 4. Then, it port 92 is connected to the high pressure side of the pump S5, the sequence of luid application to the cylinders 5S is in a reverse or clockwise direction. Consequently, the direction of rotation of drum l is easily and readily controlled in accordance with the operation of pump Se".

The `hydraulic circuit may be formed in any conventional or desired manner. A simplified diagrammatic hydraulic how circuit is shown in FlGURE `6 for purposes of fully and clearly explaining the functioning of the present invention.

Referring particularly to FIGURE 6, the illustrated circuit is a closed-loop hydraulic system extending between the hydraulic motor and bearing unit lll and the pump 35. The truck engine 6 is connected to drive the fluid pump S5 which in turn is connected to the distributor valve S7 by the conduits 553 and 89.

A control lever lli@ is connected to the pump 8S by a suitable mechanical linkage or the like, as shown in PIG. l, and controls the direction of uid ilow through the pump and consequently determines the high and low pressure connection of the pump 5S to conduits S8 and 89. The control lever ldd has a forward position, shown in phantom to the right in the FIG. 6, and it is assumed for purposes of illustration that in this position, luid flow is through the pump S5 from conduit S9 to conduit SS and consequently conduit SS is connected to the high pressure side of tie ump 5S and conduit 89 is connected to the low pressure side or" the pump. The control lever ldd has a reverse position, shown in phantom to the left in FIG. 6, in which position a reverse luid low is established by pump $5 and the conduit 83 is now connected to the low pressure side of the pump and the conduit S9 is connected to the high pressure side.

The control lever litt when centrally located between the forward position and the reverse position, as shown, constitutes a neutral position wherein the conduits 8d and 39 are effectively disconnected from the pump SS and lock the fluid within the motor circuit.

Further, when the hydraulic motor is operating in one direction and is to be quickly reversed, the mixing drum 1 is braked and establishment of high shock forces is eliminated. As the operator moves the control lever lll@ toward the neutral position, the uid flow to the cylinders 55 is progressively reduced and `the motor speed reduced accordingly. When the neutral position is reached, the fluid 63 is locked in the circuit and brakes the drum l to 19,- prevent large shock forces incident to the reverse positioning of the lever Mit).

The control lever ftd@ constituting a manual control is mounted within the cab of the truck 3 and connected to pump by a suitable coupling cable, not shown, to allow ready and convenient location of the control adjacent the operator, not shown.

A small oil reservoir lill is mounted on the truck 3 and connected to the crankcase drain 78 to collect the lubricating oil by-passed through the hydraulic motor, as previously described. Because the hydraulic power system to the motor and bearing unit 14 is a closed loop, the reservoir 161 is small and does not add appreciably to the weight ofthe truck and mixing components.

A make-up pump M2, shown in FIG. 6, connects the oil reservoir lill to the lluid conduits 3S and 89 to make up or return the withdrawn huid into the system and thereby to maintain a constant volume in the closed loop between the motor and the pump S5. Check valves 193 and ldd are connected in parallel "between each of the conduits 88 and 39 and the make-up pump ltlZ to prevent a reverse llow of fluid from the corresponding conduits. Consequently, the volume of fluid within the closed loop driving the hydraulic motor is maintained at a constant value.

A suitable pulley connection connects the makeup pump lli?. to the engine 6 for operation of the makeup pump whenever the hydraulic motor is operated. The pump to2 and connecting conduits are only shown in FIG. 6 for clarity of illustration.

The direct connection of the hydraulic pump to the engine establishes independent operation of the mixing drum and the propulsion of truck 3. The starting and the stopping of the truck and the changing of the truck driving gears can be readily and rapidly controlled in the most advantageous manner. Further, the truckmounted mixer of the present invention can be operated without any substantial training without clashing of the gear and destruction of the clutch.

The direct interconnection of the hydraulic motor as a forward bearing unit reduces the number of separate components mounted on the truck and interconnected ege-sai 1l with the" drum and permits a more modern design of a truck mounted mixer.

l. A drive mount for a tubular shaped mixing drum havin-g laclosed end for mounting on" the frame of a truck, whichl comprises a hydraulic motor includinghousf ing" and a driven shaft rotatably mounted in the housing, means to connect the driven shaft to 4the elo-sed end of the mixing drum to rotate the mixing drum, and a universal pivotl support secured to the housing and having attachment means for securement"lto the frame of the truck toy transmit the concentrated load presented at the"closed end ofthe drum directly to the frame.

2. A drive mount" for a tubular shaped mixing drum havinga closed end for mounting on the channel frame of a truck, which comprises a hydraulic motor including a housing and a driven shaft rotatably mounted in the housing, meansto connect the driven shaft to the mixing drum-to rotate the mixingV drum, a universalpivot supp-ort secured to the housing", and attachment means secured to the pivot support and including sidel plate members; extending downwardly adjacent the outer Vsurfaces of the" frame and having bolt receiving means for bolting of the side plate"members to the frame of" the truckto transmit the concentrated load presented at the" closed"end of the drum directly to the frame in thev assembled position.

3". -A truck-mounted` concrete mixer includingv a concrete mixing drum adapted to be rotatably mounted on a frame of a conventional motor truck having a running controly transmission and an engine operatively connected to drive said contro-l transmission, said mixingv drum being closed at its forward end and open at its rear- Ward end, whichj comprises-a variable displacement reversible-iiow high-pressure pump operatively" connected to" be driven by"said truck engine independently of said running control transmission, control apparatus arranged to Vcontrol said pump"as to volume and" direction of fiuidow therefrom, bearing means disposed to rotatablysupport said open rearward end of said drum, a multiradial-cylinder hydraulic motor having a rotating shaft secure"d"to the closed forward"end ofthe drum, a ball a"ndsocket joint disposed to support said hydraulic motor ou said motor truck at a single point for universal pivoting movement thereon, a torque-resisting strut interposed between said hydraulic motor and said truck" to stabilize iSaidfmotor and said mixing drum` in operating position while permitting relative movement between said mixing drum and said truck to accommodate deflections of said truck, and flexible fluid conduits" sequentially conn"ectedr4 between said"high pressure pump and the cylinders ofsaid hydraulic motor to drive said mixing drum in either direction at desired speed incident to predetermined actuation of saidl control apparatus.

4; In a transit mixer for transporting and mixing a batch of concrete or the like including a motor truck having a drive engine on one end of the truck and a mixing drum rotatably mounted on the opposite end of said truck for receiving a batch ofconcrete to be transported, ak high pressure reversible hydraulic motor having a rotating." member rotatable at the velocity range of the mixing drum, said rotating member being directly connected to the"engineend of said mixing drum to directly rotate the drum at the" sameV angular velocity as the motor, a high pressure variableV capacity pump operatively connected to"be driven by said truck engine and to drive said hydraulic motor, and control apparatus operatively connected to adjust "said variablecapacity pump in a manner to regulate" the speed and"direction of rotation of said mixing" "drum". c

5: In" a" transit concrete mixer" of the" type having a rotatable mixing drum carried by a self-propelled vehicle having a driving engine, a Variable capacity reversing ow pump connected to be driven by said vehicle driving engine independently of the"l vehicle propulsion connection of said engine, manually operable control means arranged to adjust said pump to supply pressure fluid at selected rate in selected direction of ow from saidl pump, a hydraulic motor directly connected to said mixing drum to rotate the drum at the same velocity as the hydraulic motor, fluid conduit means operatively connecting said variable capacity reversing ow pumpl to said hydraulic motor whereby said rotatable mixing drum may be driven in either direction as predetermined speed selectively by controlling said pump independently" of the propulsion of said vehicle, andI a universal joint secured to the truck and thelhydraulic motor and constituting the support for the adjacent end of the drum.

6. In a motor-truck transit mixer having a driving engine on one end of the truck and having a concrete mixing drum rotatably mounted on the opposite end of the truclt for containing a batch of" concrete and transporting the batch of concrete, a slow speedA hydraulic motor having a motor housing and a power rotated member directly connected to said mixing drum adjacent said engine, a ball socket joint mounting said motor housing on said truck to rotatably support the drum, a variable capacity hydraulicpump mounted adjacent the engineand operatively connected to be driven by said truck driving engine, fluid conduit means interconnecting said pump and said"hydraulic motor to selectively drive the rotatable member of the motor and attached drum incident to said pump being driven by said engine, and" control means operatively connected to adjust the pumping capacity of said pump thereby to regulate the iiuid pressure to said motor to regulate the speed -of rotation of said mixing drum. l

7. In a transit concrete mixer, including va vehicle having spaced running wheels secured to a yieldable frame subject to deiiection when operating overuneven terrain; av mixing drum closed at one end and open at the other end to receive a batch of concrete to be mixed and transported and adapted toV be secured to theframe close to certain running wheels and spaced"from other running wheels, a motor provided with a protruding drive shaft that is rigidly xed to the closed end of said mixing drum in a manner to rotatably support said drum end and to rotate the drum, means arranged to support said motor on said vehicle frame for universal relative movement to accommodate deiiection of said frame, means arranged to support said open end of said drum for rotation on said frame in a` manner to accommodate deiiection of said frame, and a torque arm connected between said frame andsaid universally mounted motor to maintain said motor in position relative to said framey for supporting said closed end"of said drum for rotation on said frame, the arrangement being such that said drum may be rotated as said vehicle vtraverses uneven terrain without detrimental effects upon said drum or its driving motor resulting from deflection of said yieldable frame.

8. In a transit concrete mixer including a wheeled conveyance having a yieldable frame, a mixing drum for transporting and mixing concrete, said drum being open at one end and presenting an axially disposed shaft at-the other end, a pair of spaced rollers rotatably mounted on said yieldable conveyance frame in a position to support the open end of said mixing drum, and a `drum driving motor comprising a stator and a driven rotor mounted with said driven rotor rigidly connected to said shaft of said drumy and with said stator mounted for universal movement on said yieldable conveyance frame and constituting the support for the corresponding end of the drum, the arrangement being such that said mixing drum and said motor are rigidly interconnected as a unitary structure that is"mounted at vthree points on said yieldable frame whereby weaving of said yieldable frame may occur as said conveyance moves over uneven surfaces.

9. A drive mount for a tubular shaped mixing drum having a closed end for mounting on the channel frame of a truck, which comprises a hydraulic motor including a relatively stationary housing and a driven shaft rotatably mounted in the housing, means to connect the driven shaft to the mixing drum to rotate the mixing drum, a ball pivot support having a ball member and a socket member one of which is secured to the housing, a lateral mounting `brace secured to the opposite member of the pivot support, and junction plates secured to the brace and adapted to project downwardly adjacent the outer surfaces of the frame with the brace resting on the frame and adapted to be lbolted to the frame of the truck to transmit the concentrated load presented at the closed end of the drum directly to the frame.

10. A drive mount for a tubular shaped mixing drum having -a closed end for mounting on the channel frame of a truck, which comprises a hydraulic motor including a relatively stationary housing and a driven shaft rotatably mounted in the housing, means to connect the driven shaft to the mixing drum to rotate the mixing drum, a ball pivot support having ta ball member and a socket member one of which is secured to the housing, a lateral mounting brace secured to the opposite member of the pivot support, junction plates secured to the brace and projecting downwardly adjacent the outer surfaces of the frame in the assembled position and being bolted to the frame of the truck to transmit the concentrated load presented at the closed end of the drum directly to the frame, and load distributing braces secured to the mounting brace immediately adjacent said junction plates and resting upon the adjacent members of the channel frame of the truck.

11. In a concrete mixer having a generally tubular mixing drum mounted on a truck frame and rotated about the axis of the drum, a radial hydraulic motor having a housing with a plurality of circumferentially distributed cylinders lying in a common plane and pistons in said cylinders directly coupled to drive a crank and a shaft centrally journalled in forward and rear bearings in said housing, said shaft extending perpendicular to said common plane, means to rigidly couple the motor shaft to the drum in alignment with the drum axis, universal support means secured to said truck frame and to said motor in slightly spaced forward relation to said common plane to establish a substantially vertical line extending between the rear bearing for said shaft and said support means, and bearing means secured to said frame to rotatably support the opposite end of the mixing drum with the axis of the drum extending downwardly therefrom in alignment with the motor shaft.