JP2018159170A - Cargo vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce pitching phenomenon of the vehicle body and vibration of steering lever without impairing operation responsiveness by effectively shutting off the shaking and vibration from the engine to the traveling hydraulic pump device.SOLUTION: On the vehicle body frame 20 a partition board 30 is provided which divides the engine chamber 23E in which the engine 31 is installed and the pump chamber 23 P in which the traveling hydraulic pump device 32 is installed, on the partition board 30 the traveling hydraulic pump device 32 is supported and the input axis of the traveling hydraulic pump device 32 installed over the opening part 30a of the partition board 30 and output axis of engine 31 are connected via equal speed joint 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cargo handling vehicle in which a traveling hydraulic pump device is driven by an engine mounted on a vehicle body, and the traveling device is driven by pressure oil sent from the traveling hydraulic pump device.

  Small cargo handling vehicles such as conventional skid steer loaders have an engine installed at the rear of the body frame, and left and right integrated traveling hydraulic pump devices (for example, two variable displacement axial piston pumps) installed at the front of the engine HST pump) and a hydraulic pump for cargo handling are attached in a directly connected state.

Utility Model Registration No. 2511364

  Conventionally, a traveling hydraulic pump is attached to the front of the engine, and the output shaft of the engine and the input shaft of the traveling hydraulic pump are directly connected. For this reason, the engine is shaken back and forth, left and right, and up and down due to the inertial force of the engine that occurs during forward / backward switching, start / acceleration, stop / deceleration, turning, and the like. When the engine is shaken, the traveling hydraulic pump device is shaken and transmitted to the operating shaft of the traveling hydraulic pump (the swash plate in the HST pump), and the operating swash plate moves, causing a pitching phenomenon that the vehicle body shakes back and forth. was there.

  The driver's seat is provided with a pair of left and right steering levers, and these steering levers are connected to a traveling hydraulic pump via a mechanical interlocking member such as a link mechanism. For this reason, minute vibrations (small compared to the pitching phenomenon) of the engine are transmitted to the steering lever via the traveling hydraulic pump device, which may cause the driver to become tired or misoperate.

  The present invention solves the above-mentioned problems, effectively cuts off vibrations and vibrations from the engine to the traveling hydraulic pump device, and can reduce the pitching phenomenon of the vehicle body without impairing the operation responsiveness. An object of the present invention is to provide a cargo handling vehicle capable of reducing minute vibrations and realizing a comfortable operability for a driver.

  The present invention relates to a traveling hydraulic pump device driven by an engine, left and right traveling hydraulic motors that respectively drive left and right front wheels and rear wheels by pressure oil of the traveling hydraulic pump device, and an interlocking member by a steering lever. And a steering device that controls the amount of hydraulic oil and the supply direction to the left and right traveling hydraulic motors by operating the traveling hydraulic pump device via the vehicle, and is formed on a body frame. A cross member that divides the engine chamber and the pump chamber is installed in the equipment storage chamber, the travel hydraulic pump device is supported by the cross member, and the travel hydraulic pressure is disposed facing the opening of the cross member. An input shaft of the pump device and an output shaft of the engine are connected via a constant velocity joint, and the constant velocity joint is transmitted from the engine to the traveling hydraulic pump device. Characterized in that it is configured to absorb shaking and vibrations is.

  In the above configuration, the interlocking member is preferably composed of a mechanical link mechanism that connects the steering lever and the operating shaft of the traveling hydraulic pump device.

  Further, in the above configuration, the constant velocity joint is a coupling type capable of absorbing radial displacement and radial inclination generated between the input shaft of the traveling hydraulic pump device and the output shaft of the engine, and displacement in the thrust direction. A short axis type is preferred. As a result, the vibrations and vibrations of the engine in all directions can be effectively absorbed by the constant velocity joint.

  Furthermore, in the above configuration, the device storage chamber is formed by left and right side frames and a connecting frame that connects the side frames to each other, and the cross member extends between the left and right side frames. A strength member that crosses the intermediate portion is preferable. Thereby, the body frame can be reinforced.

  According to the present invention, the traveling hydraulic pump device is supported by the cross member, and the vibration and vibration from the engine to the traveling hydraulic pump device can be effectively cut off by the constant velocity joint, and the operation responsiveness is impaired. Therefore, the pitching phenomenon can be reduced. Further, the vibration of the steering lever connected to the traveling hydraulic pump device via the interlocking member can be reduced, and the comfortable operability for the driver can be realized.

It is a top view which shows the vehicle body frame of the skid steer loader concerning this invention. (a), (b) shows a traveling hydraulic pump device and a steering device, (a) is a left side view, (b) is a right side view. It is a perspective view which shows a vehicle body frame. (a)-(d) shows a coupling type short axis type constant velocity joint, (a) is a longitudinal sectional view, (b) is an explanatory view showing a displacement in the radial direction, and (c) is an inclination in the radial direction. Explanatory drawing which shows, (d) is explanatory drawing which shows expansion and contraction of a thrust direction. It is a perspective view which shows a skid steer loader. It is a block diagram explaining the power transmission system of a skid steer loader.

  Hereinafter, an embodiment of a skid steer loader which is a cargo handling vehicle according to the present invention will be described with reference to the drawings.

(Structure of cargo handling vehicle)
As shown in FIG. 5, a skid steer loader, which is a small cargo handling vehicle, has a pair of front and rear right front wheels 12FR and a right rear wheel 12RR, and a pair of front and rear left front wheels 12FL and a left rear wheel 12RL. A traveling device 11 and a cargo handling device 14 having a bucket 13 are provided. The cargo handling device 14 includes a pair of left and right booms 15 that are supported on the both sides of the driver's seat 19 of the vehicle body 10 so as to be able to move up and down around the rear end portion and extend forward, and the front end portions of these booms 15 in the vertical direction. A pair of left and right boom cylinders 16 that are connected between the vehicle body 10 and the front end side of the boom 15 to raise and lower the boom 15, and a front end side of the boom 15 and the bucket 13. And a pair of left and right bucket cylinders 17 connected to each other. Then, the boom 15 is raised and lowered by the boom cylinder 16 to raise and lower the bucket 13, and the bucket 13 is turned up and down by the bucket cylinder 17 to perform the cargo handling operation. As shown in FIG. 6, the cargo handling device 14 is provided with a cargo handling control valve 18 for operating the boom cylinder 16 and the bucket cylinder 17.

  In addition, although the cargo handling apparatus 14 which has arrange | positioned a pair of boom 15 in the rear part both sides of the vehicle body 10 was demonstrated, it is the structure which arrange | positions one boom on the left-right one side of the vehicle body 10, and supports a bucket in a cantilever state. There may be.

(Frame structure of cargo handling vehicle)
As shown in FIGS. 1 and 3, the vehicle body frame 20 has a bottom plate (connection frame) 24 and a front member (connection frame) 25 attached between left and right side frames 21L and 21R configured in a box shape. A device housing chamber 23 is formed. The bottom plate 24 is inclined at a predetermined angle from the rear end portion to the center portion of the device accommodating chamber 23 at a predetermined angle, and the bottom plate 24 is inclined in this manner, thereby cleaning the inside of the device accommodating chamber 23 after cleaning. The waste water can be discharged smoothly.

  Boom supports 26L and 26R that support the rear ends of the boom 15 and the boom cylinder 16 are provided in the raised state at the rear of the left and right side frames 21L and 21R, respectively. Between the boom supports 26L and 26R, a tail support member 27, a tail gate (not shown), a rear weight (not shown), etc., which are connecting frames, are attached. Further, a center weight (not shown) is attached to the bottom of the bottom plate 24.

  A partition plate (cross member) 30 that divides the front pump chamber 23P and the rear engine chamber 23E is attached in a transverse direction across the left and right side frames 21L and 21R at a substantially central portion of the device storage chamber 23. The partition plate 30 constitutes a part of the strength member of the vehicle body frame 20. The engine chamber 23E is provided with four engine support portions 29, and the engine 31 is moved in the front-rear direction with the four receiving portions of the engine 31 sandwiched between the engine support portions 29 by vibration-proof rubber elastic mounts. It is mounted on. In the pump chamber 23P, a traveling hydraulic pump device (for example, an HST pump) 32 is attached to the front surface of the partition plate 30, and a cargo handling hydraulic pump device 33 is integrally provided at a front portion of the traveling hydraulic pump device 32. ing. The traveling hydraulic pump device 32 includes a left drive pump 32L and a right drive pump 32R which are closed circuit type variable displacement axial piston pumps that are integrally disposed at the front and rear positions. An operation shaft 40L for operating the swash plate disposed inside protrudes on the left side of the left drive pump 32L, and a fixed shaft 52R protrudes on the opposite side of the operation shaft 40L. Further, an operating shaft 40R for operating a swash plate disposed therein protrudes on the right side of the right drive pump 32R, and a fixed shaft 52L protrudes on the opposite side of the operating shaft 40R.

(Power system)
As shown in FIG. 6, the traveling device 11 is driven by the left drive motor (travel hydraulic motor) 61L driven by the pressure oil supplied from the left drive pump 32L and the pressure oil supplied from the right drive pump 32R. And a right drive motor (traveling hydraulic motor) 61R. The left drive motor 61L drives the chain-type winding transmission mechanism via the left speed reducer 62L, and the left front and rear wheels 12FL and 12RL are rotationally driven via the left front wheel drive axle 63FL and the left rear wheel drive axle 63RL, respectively. Is done. The chain drive mechanism is driven by the right drive motor 61R via the right speed reducer 62R, and the right front and rear wheels 12FR and 12RR are rotated by the right front wheel drive axle 63FR and the right rear wheel drive axle 63RR. The

  Further, the pressure oil supplied from the cargo handling hydraulic pump device 33 is supplied to the boom cylinder 16 and the bucket cylinder 17 (and the attachment cylinder) via the cargo handling control valve 18, respectively, and the boom 15 and the bucket 13 are driven respectively. The Here, for the left and right drive pumps 32R and 32L and the cargo handling hydraulic pump device 33, for example, constant displacement gear pumps are used, and for the right and left drive motors 61R and 61L, for example, constant displacement radial piston motors are used. .

(Engine, partition plate, hydraulic pump device)
A traveling hydraulic pump device 32 is supported on the front surface of the partition plate 30, and an input shaft 32 s is exposed in an opening 30 a formed in the partition plate 30. An output shaft 31 s of the engine 31 disposed corresponding to the opening 30 a and an input shaft 32 s of the traveling hydraulic pump device 32 are connected via a constant velocity joint 34.

  That is, as shown in FIG. 4A, the flywheel 37 is attached to the end of the output shaft 31 s of the engine 31, and the engine side coupling 38 is attached to the flywheel 37. On the other hand, a pump side coupling 35 is attached to the input shaft 32s of the traveling hydraulic pump device 32, and a pump mount 36 is attached to the pump side coupling 35 via a bearing 36a. The pump mount 36 is fixed to the partition plate 30. Further, a constant velocity joint 34 is interposed between the engine side coupling 38 and the pump side coupling 35.

  This constant velocity joint 34 is a coupling-type short shaft type, and includes a short shaft 34a, an inner ring 34b, a sphere 34c, a cage 34d, and an outer ring 34e, and a radial displacement δ shown in FIG. A radial direction inclination θ shown in (c) and a thrust direction displacement γ shown in FIG. 4 (d) can be absorbed within a predetermined range. Lubricating oil is filled between the pump side coupling 35 and the constant velocity joint 34 and between the engine side coupling 38 and the constant velocity joint 34. The constant velocity joint 34 is covered with a boot 34f that can be bent and stretched.

(Steering device)
As shown in FIGS. 1 and 2, a pair of left and right steering levers 42 </ b> L and 42 </ b> R are arranged in a standing posture on the front floor 41 of the driver's seat 19. The steering levers 42L, 42R and the operation shafts 40L, 40R of the left drive pump 32L and the right drive pump 32R are interlocked and connected via mechanical link mechanisms (interlocking members) 43L, 43R.

  That is, as shown in FIGS. 1 and 2A, the left front and rear wheel link mechanism 43L is fixed to the base end portion of the steering lever 42L and supports the steering lever 42L so as to be swingable in the front-rear direction. A support shaft 44L, an operation arm 46L attached to the steering support shaft 44L, a passive lever 47L attached to the operation shaft 40L, and a link rod 48L that interlocks and connects the operation arm 46L and the passive lever 47L. ing. A shock absorber 45L is connected between the base end side of the steering lever 42L and the vehicle body frame 20. Further, a neutral spring 51L is connected between a neutral lever 50L that is fixed to the operation shaft 40L and extends to the opposite side of the passive lever 47L, and a fixed shaft 52L of the right drive pump 32R.

  As shown in FIGS. 1 and 2B, the right front and rear wheel link mechanism 43R is fixed to the base end portion of the steering lever 42R and supports the steering lever 42R so as to be swingable in the front-rear direction. 44R, a shock absorber 45R connected between the base end side of the steering lever 42R and the vehicle body frame 20, an operating arm 46R attached to the steering shaft 44R, and a passive lever 47R attached to the operating shaft 40R. A link rod 48R that interlocks and connects the operation arm 43R and the passive lever 47R is provided. Further, a neutral spring 51R is connected between a neutral lever 50R that is fixed to the operation shaft 40R and extends to the opposite side of the passive lever 47R, and a fixed shaft 52R of the left drive pump 32L.

  Therefore, when the left and right steering levers 42L and 42R are operated, the operating shafts 40L and 40R of the traveling hydraulic pump device 32 are operated via the link mechanisms 43L and 43R, and the left and right drive pumps are operated according to the angle of the swash plate installed therein. The discharge amount and the discharge direction of the pressure oil from 32L and 32R to the left and right drive motors 61L and 61R are controlled. As a result, the left and right drive motors 61L and 61R are driven to operate the rotational speed and rotational direction of the left front and rear wheels 12FL and 12RL and the right front and rear wheels 12RL and 12RR, and the traveling speed and the traveling direction are manipulated. Further, since the left and right steering levers 42L and 42R and the operation shafts 40L and 40R of the traveling hydraulic pump device 32 are interlocked and connected via mechanical link mechanisms 43L and 43R, the vibration of the traveling hydraulic pump device 32 is vibrated. Is easily transmitted to the left and right steering levers 42L and 42R, but in this embodiment, the vibration generated in the engine 31 is attenuated and absorbed by the constant velocity joint 34 and is not easily transmitted to the traveling hydraulic pump device 32. It has a structure.

(Effect of Example)
According to the above embodiment, the partition plate 30 supports the traveling hydraulic pump device 32, and the output shaft 31 s of the engine 31 supported by the engine support portion 29 of the device housing chamber 23 via the elastic mount, and the traveling Since the constant velocity joint 34 is provided between the input shafts 32s of the hydraulic pump device 32, it is generated in the engine 31 due to the inertial force of the engine by switching between forward and reverse, starting / acceleration, stop / deceleration, turning, etc. It is possible to effectively attenuate and block transmission of vibrations and vibration of the engine 31 itself to the traveling hydraulic pump device 32. Therefore, the pitching phenomenon by the traveling hydraulic pump device 32 can be reduced without impairing the operation responsiveness from the steering levers 42L, 42R to the traveling hydraulic pump device 32. Further, the vibrations of the steering levers 42L and 42R connected to the traveling hydraulic pump device 32 via the link mechanisms 43L and 43R can be greatly reduced, and a comfortable operability for the driver can be realized.

  Further, by making the constant velocity joint 34 a coupling type short shaft type, it is possible to absorb the radial displacement δ and inclination θ of the output shaft 31 s of the engine 31 and the displacement γ in the thrust direction, effectively. The vibration of the engine 31 can be absorbed.

  Furthermore, since the partition plate 30 is a strength member that partitions the pump chamber 23P and the engine chamber 23E, the vehicle body frame 20 can be effectively reinforced.

DESCRIPTION OF SYMBOLS 10 Car body 11 Traveling apparatus 13 Bucket 14 Handling apparatus 15 Boom 16 Boom cylinder 17 Bucket cylinder 20 Car body frame 21R Right side frame 21L Left side frame 23 Equipment accommodation room 23P Pump room 23E Engine room 24 Bottom plate (connection member)
25 Front member (connecting member)
30 Bulkhead plate (cross member)
30a Opening 31 Engine 31s Output shaft 32 Traveling hydraulic pump device 32s Input shaft 32L, 32R Left and right drive pump 34 Constant velocity joint 35 Pump side coupling 36 Pump mount 38 Engine side coupling 42L, 42R Steering levers 43L, 43R Link mechanism (Interlocking member)
61L, 61R Left and right drive motor

Claims (4)

The traveling hydraulic pump device driven by the engine, the left and right traveling hydraulic motors that respectively drive the left and right front wheels and rear wheels by the pressure oil of the traveling hydraulic pump device, and the steering lever via the interlocking member A steering vehicle that operates a hydraulic pump device and controls a hydraulic oil amount and a supply direction to the left and right traveling hydraulic motors,
A cross member that divides the engine chamber and the pump chamber is installed in the equipment housing chamber formed in the body frame,
Supporting the traveling hydraulic pump device to the cross member;
An input shaft of the traveling hydraulic pump device arranged facing the opening of the cross member and an output shaft of the engine are connected via a constant velocity joint,
A cargo handling vehicle configured to absorb vibration and vibration transmitted from the engine to the traveling hydraulic pump device by the constant velocity joint. The cargo handling vehicle according to claim 1,
The interlocking member comprises a mechanical link mechanism that connects a steering lever and an operation shaft of a traveling hydraulic pump device. In the cargo handling vehicle according to claim 1 or 2,
The constant velocity joint is a coupling short shaft type that can absorb radial displacement and radial inclination generated between the input shaft of the traveling hydraulic pump device and the output shaft of the engine, and displacement in the thrust direction. A cargo handling vehicle characterized by that. In the cargo handling vehicle according to any one of claims 1 to 3,
The device storage chamber is formed by left and right side frames and a connecting frame that connects the side frames to each other.
The cross member is a strength member that traverses an intermediate portion of the device storage chamber across the left and right side frames.

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