JP2019049112A - Hydraulic pump support structure for work machine - Google Patents

Abstract

To provide a hydraulic pump support structure for a working machine capable of favorably relieving a load acting on a mounting portion of a hydraulic pump device having a cantilever support structure.SOLUTION: In a hydraulic pump support structure for a working machine comprising an engine 13 supported by a body frame 12, a house 15 for housing the engine, and a hydraulic pump device 14 attached to the engine in a cantilevered manner, a free end side of the hydraulic pump device is supported by a suspension 16 suspended from a top plate 15a of the house, and the suspension is provided with a coil spring 38 which can be elastically displaced in the vertical direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic pump support structure of a working machine, and more particularly to a hydraulic pump support structure of a working machine provided with a plurality of engine driven hydraulic pumps.

  In various work machines that use an engine as a drive source, such as pile driving machines, ground improvement machines, cranes, etc., hydraulic oil discharged from a hydraulic pump driven by the engine is supplied to various work equipment such as hydraulic motors and hydraulic cylinders Are doing various tasks. The hydraulic pump generates hydraulic pressure by adding a plurality of gear pumps to a so-called tandem-type hydraulic pump device in which two swash plate type hydraulic pumps are connected in series in the rotational axis direction. A working machine equipped with such a hydraulic pump device executes control means to increase or decrease the displacement of the swash plate type hydraulic pump based on a preset engine load condition to adjust the engine torque, thereby controlling the engine during work. The smooth operation of the vehicle is maintained (see, for example, Patent Document 1).

JP, 2016-108997, A

  The conventional hydraulic pump device has a long and heavy structure because a plurality of hydraulic pumps are connected in series in the direction of the rotational axis, and the support structure is the hydraulic pressure disposed closest to the engine The pump is supported in a cantilever state by being attached to the engine block through a flange. For this reason, since the rotational moment generated by the weight of the hydraulic pump device during engine operation acts as an axial vibration load on the flange mounting bolt, slack or breakage of the bolt at the mounting portion is likely to occur. In addition, when the natural frequency decreases due to the lengthening and weight increase of the hydraulic pump device, resonance of the hydraulic pump device is likely to occur when the engine is operated at a low rotational speed, which acts on the mounting portion There is a problem of causing an increase in load.

  Then, an object of this invention is to provide the hydraulic pump support structure of the working machine which can relieve favorably the load which acts on the attaching part of the hydraulic pump apparatus of a cantilever support structure.

  In order to achieve the above object, a hydraulic pump support structure of a working machine according to the present invention comprises an engine supported by an airframe frame, a house accommodating the engine, and a hydraulic pump device cantilevered to the engine In the hydraulic pump support structure of a working machine, the free end side of the hydraulic pump device is supported by a suspension body suspended from a top plate of the house, and the suspension body is elastically deformable so as to be elastically displaceable in the vertical direction. It is characterized by having a body.

  In addition, the suspension body has a house side member whose upper portion is attached to the top plate, a shaft member which penetrates the lower portion of the house side member in the vertical direction, and a pump side member which is attached to the hydraulic pump device And a large diameter portion is provided at an upper portion of the shaft member, and the pump side member is provided at a lower portion of the shaft member, and the elastic body is disposed between the large diameter portion and a lower portion of the house side member. The large diameter portion has a male screw portion provided on an upper portion of the shaft member and a first nut screwed with the male screw portion. It is characterized by

  Further, the house side member includes a first holder provided with a first through hole for penetrating the shaft member, a connecting arm projecting from both sides of the first holder, and a pair corresponding to the connecting arm. The suspension rod is characterized in that the upper end is attached to the top plate and the lower end is attached to the tip of the connecting arm via a universal joint.

  Further, the pump side member is provided at a second holder provided with a second through hole for penetrating the shaft member, a locking arm projecting from both sides of the second holder, and a lower portion of the shaft member. In a state in which the second holder having the second nut screwed to the provided male screw portion and the suspension fitting attached to the hydraulic pump device and the second holder penetrating the shaft member is supported by the second nut The suspension bracket is engaged with the tip end of the engagement arm.

  According to the hydraulic pump support structure of the working machine of the present invention, the free end side of the hydraulic pump device is supported by the hanging body suspended from the top plate of the house, and the hanging body is elastically deformable in the vertical direction. Since the body is provided, not only can the suspension body be mounted using the upper space of the hydraulic pump device which has a relatively large space in the house, but also the vibration during engine operation is transmitted to the house side Instead, only the weight of the hydraulic pump device can be supported to reduce the rotational moment, and the load acting on the mounting portion of the hydraulic pump device can be favorably alleviated.

  In addition, the lower part of the house side member is vertically penetrated by the shaft member, and the coil spring is interposed between the first nut provided on the upper portion of the shaft member and the lower part of the house side member It is possible to obtain the desired elastic force of the coil spring with various structures, and it is possible to easily adjust the supporting reaction force of the hydraulic pump device without being influenced by the length and weight of the hydraulic pump device which varies with various working machines. .

  Furthermore, since universal joints are provided at both ends of the suspension rod, even if the rear part of the hydraulic pump device largely swings back and forth and left and right due to cranking at engine start and resonance of the hydraulic pump device, both ends of the suspension rod The bending moment does not act on the top plate and the durability of the top plate and the hanging body can be improved.

  In addition, since the suspension bracket attached to the hydraulic pump device is engaged with the locking arm of the pump side member, the suspension bracket is attached to the hydraulic pump device in advance before mounting the hydraulic pump device on the machine frame. It is possible to quickly set up the suspension body and adjust the support reaction force of the hydraulic pump device.

It is a side view of a hydraulic pump support structure of a working machine showing an embodiment of the present invention. It is a rear view similarly. It is the III-III sectional view of FIG. It is a perspective view of the principal part similarly.

  1 to 4 show an embodiment of the present invention, and the hydraulic pump support structure 11 of the working machine shown in this embodiment is a diesel engine (hereinafter referred to as "the diesel engine") disposed above the bottom wall 12a of the airframe frame 12. The engine 13), a hydraulic pump device 14 attached to the rear of the engine 13, a box-shaped house 15 accommodating these, and the hydraulic pump device 14 suspended from a top plate 15a of the house 15 A suspension 16 is provided.

  FIG. 1 shows the left side surface of the hydraulic pump device 14 whose front end is attached to the engine 13. The hydraulic pump device 14 is a so-called tandem hydraulic pump device in which a first hydraulic pump 17 and a second hydraulic pump 18, which are variable displacement swash plate type hydraulic pumps, are connected in series in the rotational axis direction. A flange 19 provided at the front end of the hydraulic pump 17 is fastened to the engine block 13 a by a bolt 20. In addition, the pump shaft 21 protruding from the front end of the first hydraulic pump 17 is rotationally driven by being connected to the power transmission unit 22 provided on the output shaft (not shown) of the engine 13, and the first hydraulic pump 17 The displacement volume is adjusted by tiltingly driving the swash plate about the axis with the first control valve 17a and the second control valve 18a respectively provided on the upper part of the second hydraulic pump 18 and the second hydraulic pump 18.

  A third hydraulic pump 23, which is a fixed displacement gear pump, is connected to the rear end of the second hydraulic pump 18 via an adapter 24. Further, the housing 17b of the first hydraulic pump 17 and the housing 18b of the second hydraulic pump 18 are integrally connected via an intermediate block 25, and a part of the driving force is transmitted to the right side surface of the intermediate block 25. A gear box 26 for taking out is provided, and a fourth hydraulic pump 27 which is a fixed displacement gear pump is connected to a rear end of the gear box 26.

  The power transmission unit 22 includes a coupling 28 in which an inner member 28 a and an outer member 28 b in which the pump shaft 21 is splined and assembled and fastened with a bolt 29, a flywheel 30 directly connected to the output shaft of the engine 13, and a cup An adapter 31 for attaching the ring 28 to the flywheel 30, the adapter 31 being fastened to the flywheel 30 with a bolt 32 and the coupling 28 being fastened to the adapter 31 with a bolt 33 The coupling 28 is integrally rotated with the rotation of the wheel 30, and the driving force from the engine 13 is transmitted to the splined pump shaft 21.

  The hanging body 16 is suspended from the top plate 15a of the house 15 to support the rear portion (free end side) of the hydraulic pump device 14, and the house side member 34 whose upper portion is attached to the top plate 15a; A columnar shaft member 35 penetrating the lower portion of the side member 34 in the vertical direction, and a pump side member 36 attached to the hydraulic pump device 14, and the large diameter portion 37 is provided on the upper portion of the shaft member 35 The pump side member 36 is provided at the lower part of the shaft member 35. Further, between the large diameter portion 37 and the lower portion of the house side member 34, a shaft member 35 is inserted in a coil spring 38 which is an elastic body.

  The house side member 34 has a cylindrical first holder 39 provided with a first through hole 39a for penetrating the shaft member 35 in the vertical direction, and a connecting arm 39b projecting from both sides of the first holder 39, 39b and a pair of suspension rods 40, 40 corresponding to the connecting arms 39b. Further, on the side surface of the first holder 39, a grease supply port 39c for supplying a lubricating oil for reducing the sliding resistance of the shaft member 35 penetrating the first through hole 39a is provided.

  The suspension rod 40 is one in which one of the male screws provided at both ends of the long round bar member 40a is a reverse screw, and a ball joint 40b, which is a universal joint, is screwed to each male screw. , 40b, the upper end portion is fastened to the mounting portion 15b of the top plate 15a with a nut 41, and the lower end portion is fastened to the tip end portion of the connecting arm 39b with a nut 42, respectively. In addition, after loosening the anti-rotation nut 40c screwed to both ends of the round bar member 40a to make the round bar member 40a rotatable relative to the ball joint 40b, a through hole provided in the round bar member 40a When the rotary operation jig (not shown) is engaged with 40d and the screwing amount of the round bar member 40a is reduced, the ball joints 40b and 40b move away from each other to increase the screwing amount. When rotated in the direction, the ball joints 40b, 40b are configured to move in the direction approaching each other. As a universal joint, a universal joint or the like can be adopted in addition to a general ball joint. In addition, one axial center of each of the suspension rods 40, 40 is eccentrically disposed forward of the axial center of the shaft member 35, and the other is eccentrically disposed rearward and arranged alternately. It prevents it from tilting in the direction.

  The large diameter portion 37 has an externally threaded portion 35a provided on the upper portion of the shaft member 35, a first nut 43 screwed to the externally threaded portion 35a, and a washer 44 brought into contact with the lower surface of the first nut 43. doing. The first nut 43 is screwed to the shaft member 35, and is detentated by joining means such as welding. Further, the lower end of the coil spring 38 abuts on the upper surface of the first holder 39 and the upper end thereof is washer 44 by the shaft member 35 being assembled by penetrating the washer 44, the coil spring 38 and the first holder 39 in this order from above. The shaft member 35 is controlled to move downward and drop out of the first holder 39.

  The pump side member 36 has a cylindrical second holder 45 provided with a second through hole 45 a for vertically penetrating the shaft member 35, and a locking arm 45 b provided on both sides of the second holder 45. , 45b, a second nut 46 screwed to an externally threaded portion 35b provided at the lower portion of the shaft member 35, and a pair of left and right hanging fittings 48, 48 fastened to the adapter 24 at the rear of the second hydraulic pump 18 by bolts 47. And. Further, the second holder 45 is penetrated from above by the shaft member 35, and is supported by the second nut 46 screwed to the male screw portion 35b. By causing the split pin 46a to pass through the second nut 46 in a state where the groove (not shown) of the second nut 46 and the through hole (not shown) provided in the shaft member 35 coincide with each other. There is a detent. Furthermore, with the U-shaped locking groove 45c provided at the tip end of the locking arm 45b inserted in the locking hole 48a provided in the suspension bracket 48, the left and right suspension rods 40 using the rotation operation jig. And 40 are screwed into the ball joint 40b, respectively, the shaft member 35 and the second holder 45 are simultaneously pulled up, and the coil spring 38 starts to contract. As a result, an upward elastic force is generated in the coil spring 38, and a reaction force for pulling up the hydraulic pump device 14 is applied via the suspension fitting 48.

  The hydraulic pump support structure 11 of such a working machine is supported by a suspension 16 having a rear portion (free end side) of the hydraulic pump device 14 hanging down from the top plate 15a of the house 15, and the suspension 16 is Since the coil spring 38 which can be elastically displaced in the vertical direction is provided, not only the mounting of the suspension 16 can be performed utilizing the upper space of the hydraulic pump device 14 having a relatively large space in the space within the house 15 It is possible to support only the weight of the hydraulic pump device 14 and reduce the rotational moment without transmitting the vibration during operation of the engine 13 to the house 15 side, and the mounting portion of the hydraulic pump device 14, for example, an engine block The load acting on the female screw portion 13b formed on the rear surface of 13a can be favorably relieved.

  Further, since the coil spring 38 is interposed between the first nut 43 and the first holder 39 provided on the upper portion of the shaft member 35 penetrating the first holder 39 in the vertical direction, the rotation operation of the suspension rod 40 is performed. Makes it possible to obtain the desired elastic force of the coil spring 38, and easily adjust the support reaction force of the hydraulic pump device 14 regardless of the length and weight of the hydraulic pump device 14 which differ depending on various working machines. it can.

  Furthermore, since the ball joints 40a are provided at both ends of the suspension rod 40, the suspension is performed even if the rear part of the hydraulic pump device 14 largely shakes back and forth and left and right due to cranking at engine start and resonance of the hydraulic pump device 14. The bending moment does not act on both ends of the rod 40, and the durability of the top plate 15a and the hanging body 16 can be improved.

  In addition, since the suspension bracket 48 attached to the adapter 24 at the rear of the second hydraulic pump 18 is locked to the locking arms 45 b protruding from both sides of the second holder 45, the hydraulic pump device on the machine frame 12 It becomes possible to attach the suspension fitting 48 to the hydraulic pump device 14 in advance before mounting 14, and the assembly of the suspension 16 and the adjustment of the supporting reaction force of the hydraulic pump device 14 can be performed quickly.

  The present invention is not limited to the embodiment described above, the number of hydraulic pumps connected to the engine is optional, and the type of work machine is not limited. In addition, the supporting body only needs to be provided with an elastic body capable of suppressing the vertical vibration while supporting the weight of the hydraulic pump, and can be appropriately configured according to various conditions such as a space to be attached.

  11 ... hydraulic pump support structure, 12 ... body frame, 12a ... bottom wall, 13 ... diesel engine, 13a ... engine block, 13b ... internal thread, 14 ... hydraulic pump device, 15 ... house, 15a ... top plate, 15b ... mounting Part 16 suspension body 17 first hydraulic pump 17a first control valve 17b housing 18 second hydraulic pump 18a second control valve 18b housing 19 flange 20 20 Bolts 21 ... pump shaft 22 ... power transmission unit 23 ... third hydraulic pump 24 ... adapter 25 ... intermediate block 26 ... gear box 27 ... fourth hydraulic pump 28 ... coupling 28a ... inner member , 28b: outer member, 29: bolt, 30: flywheel, 31: adapter, 32, 33: bolt, 34: house side member, 35: shaft member 35a, 35b: Male thread portion 36: Pump side member 37: Large diameter portion 38: Coil spring 39: First holder 39a: First through hole 39b: Connecting arm 39c: Greasing port 40: Suspension rod, 40a: round bar member, 40b: ball joint, 40c: nut, 40d: through hole, 41, 42: nut, 43: first nut, 44: washer, 45: second holder, 45a: second penetration Hole 45b Locking arm 45C Locking groove 46 Second nut 46a Split pin 47 Bolt 48 Suspension bracket 48a Locking hole

Claims (5)

  In a hydraulic pump support structure of a working machine comprising an engine supported by an airframe frame, a house accommodating the engine, and a hydraulic pump device cantilevered to the engine, the free end of the hydraulic pump device A hydraulic pump support structure for a working machine, characterized in that the side is supported by a hanging body suspended from the top plate of the house, and the hanging body is provided with an elastic body that can be elastically displaced in the vertical direction.   The suspension body has a house side member whose upper part is attached to the top plate, a shaft member which penetrates the lower part of the house side member in the vertical direction, and a pump side member which is attached to the hydraulic pump device A large diameter portion is provided at the upper portion of the shaft member, and the pump side member is provided at the lower portion of the shaft member, and the elastic body is the shaft between the large diameter portion and the lower portion of the house side member The hydraulic pump support structure for a working machine according to claim 1, which is a coiled spring in which a member is inserted.   The hydraulic pump for a working machine according to claim 2, wherein the large diameter portion has an external thread portion provided on an upper portion of the shaft member, and a first nut screwed to the external thread portion. Support structure.   The house side member includes a first holder provided with a first through hole for penetrating the shaft member, a connecting arm projecting from both sides of the first holder, and a pair of suspension corresponding to the connecting arm. The rod according to claim 2 or 3, wherein the hanging rod is attached at its upper end to the top plate and at its lower end to the tip of the connecting arm via a universal joint. Hydraulic pump support structure of the working machine.   The pump side member is provided at a lower portion of the shaft member, a second holder provided with a second through hole for penetrating the shaft member, a locking arm provided on both sides of the second holder, and A second nut threadedly engaged with the male screw portion and a suspension fitting attached to the hydraulic pump device, the second holder penetrating the shaft member being supported by the second nut; The hydraulic pump support structure for a working machine according to any one of claims 2 to 4, wherein the suspension fitting is engaged with a tip end portion of an engagement arm.

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