JPH08326010A - Rolling roller - Google Patents

Abstract

PURPOSE: To simplify the transmission structure of power to a driving wheel while avoiding the generation of a phenomenon such as the re-shaking etc. of a car. CONSTITUTION: A hydraulic pump is connected to an engine. The hydraulic pump is connected to a hydraulic motor 12 through a piping. A pair of axle housings 20, 21 are arranged on both sides in the car width direction of the hydraulic motor 12, and unified with a motor housing. Mounting flanges 27, in which the thickness direction is directed in the longitudinal direction of a car body, are installed on the outer circumferential sections of the axle housings 20, 21. The axle housings 20, 21 are set up to a bracket on the car body side through the mounting flanges 27. A plurality of driving wheels 3 are fitted to the right-left nose sections 15b, 15a of the output shaft of the hydraulic motor 12 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure roller such as a tire roller for driving a drive wheel by a fluid pressure motor, and more particularly to a pressure roller having a drive structure for the drive wheel. .

[0002]

2. Description of the Related Art As a conventional pressure roller, for example, there is one shown in FIG. This is because the rotary shaft of the hydraulic pump 51 is connected to the engine 50,
Is rotatably driven by the power transmission from the engine 50 and can discharge hydraulic oil. To the suction port and the discharge port of the hydraulic pump 51, one end portions of the hydraulic pipes 52 and 53 forming the supply pipe or the return pipe are connected. Each of the hydraulic pipes 52, 53 is extended rearward in the front-rear direction of the vehicle body, and the other ends thereof are connected to a hydraulic motor 54 composed of an axial piston motor or the like. The rotary shaft of the hydraulic motor 54 is connected to a differential gear 56 via a speed reducer 55, and the differential gear 56 is connected via a chain mechanism 57 to
The driving torque can be transmitted to the axle of the rear wheel 58 (driving wheel) arranged below it.

A ring-shaped mounting flange is formed on the outer peripheral surface of the axle housing that rotatably supports the axle along the circumferential direction, and the mounting frame hangs down from the vehicle body frame. The axle housing is fixed to the vehicle body frame by being bolted to the bracket. Further, a front wheel 60 (guide wheel) is disposed on the front portion of the vehicle body so as to be turnable via a yoke 59.

[0004]

However, in the conventional pressure roller as described above, in addition to the hydraulic motor 54, the speed reducer 5 is used to transmit the drive torque to the drive wheels.
A large number of parts such as 5, the chain mechanism 57 and the like are required. Therefore, there is a problem that the drive structure is complicated and assembly and maintenance of each component are complicated.

Further, as described above, in the structure in which the driving torque from the hydraulic motor 54 is transmitted to the axle through the gear and the chain, the backlash of the gear and the elongation and wear of the chain cause the wheel rotation, especially when the wheel rotates. When starting / stopping the vehicle, phenomena such as swinging back may occur in the vehicle. This is one of the reasons that the rolled road surface has a wavy uneven shape, which is not preferable.

Further, since the mounting flange provided on the axle housing has its thickness direction oriented in the vehicle width direction, the axis of the bolt joining the mounting flange to the bracket is oriented in the vehicle width direction. Therefore, when the drive wheels are attached to the axle,
Difficult to remove. Therefore, after the axle housing is attached to the vehicle body, the drive wheels have to be attached to the axle supported by the axle housing.

The present invention has been made by paying attention to the above problems, and simplifies the structure for transmitting power to the drive wheels, and at the same time, causes the phenomenon such as the rolling back of the vehicle as described above. It is an object to provide an avoidable compaction roller.

[0008]

In order to achieve the above object, the pressure roller according to claim 1 of the present invention is a pressure roller for driving a drive wheel by a fluid pressure motor, wherein the fluid pressure motor is a vehicle. Arranged in the widthwise central part or approximately central part,
The output shaft is projected from the housing of the fluid pressure motor to both sides in the vehicle width direction, and one or a plurality of drive wheels is attached to each projection of the output shaft.

Further, according to the invention described in claim 2, in contrast to the structure described in claim 1, the housing of the fluid pressure motor is fixed to an axle housing which rotatably supports the output shaft. The axle housing is characterized in that it is attached to the vehicle body side at a position between the left and right drive wheels. The invention described in claim 3 is different from the structure described in claim 2 in that the mounting flange is provided on the axle housing and has a bolt hole that opens in the vehicle front-rear direction, and is provided on the vehicle body frame. And a bracket having an abutting portion capable of abutting on the mounting flange from the front-rear direction of the vehicle body, and the mounting flange and the abutting portion are joined by a bolt having an axis oriented in the vehicle front-rear direction. It is characterized by that.

Further, in the invention described in claim 3, in contrast to the configuration described in claim 2 or 3, the fluid pressure motor is a radial piston motor in which the housing constitutes a cam ring. The housing of the fluid pressure motor is characterized in that it is detachably fixed to the axle housing.

[0011]

According to the first aspect of the invention, the output shaft of the hydraulic motor is used as a drive axle, and one or more drive wheels are individually fixed to the left and right end portions of the output shaft. The drive torque of the hydraulic motor can be directly transmitted to the left and right drive wheels.

As a result, since the drive torque is not transmitted to the drive wheels through the chain mechanism or the speed reducer, the structure is simplified, and the occurrence of problems due to the backlash of the gears and the elongation of the chain is avoided. Furthermore, since a speed reducer and the like are not necessary and the left and right drive wheels are driven by one hydraulic motor, the parts for transmitting the drive torque to the drive wheels can be downsized.

Further, since each tip portion of the output shaft extending in the vehicle width direction has a length to which a plurality of wheels can be attached, a plurality of wheels are attached to each tip portion of the output shaft. In addition to being mountable, it is possible to mount drive wheels having different widths by replacing the disk wheel or hub mounted on the tip without replacing the axle housing.

According to the second aspect of the invention, the axle housing can be attached to or removed from the vehicle body frame with all the drive wheels attached to the output shaft that is integral with the axle housing. Becomes At this time, since the drive wheels on the left and right are relatively spaced from each other in the vehicle width direction, it is easy to attach and detach the axle housing to and from the vehicle body frame.

Further, since the mounting portion of the axle housing to the vehicle body frame is provided between the left and right drive wheels, the mounting portion does not interfere with the mounting of the drive wheel at each tip of the output shaft. Absent. Further, in the invention described in claim 3, since the shaft of the bolt for mounting the axle housing on the vehicle body side is oriented in the front-rear direction of the vehicle body, even if the drive wheel is mounted on the output shaft, it is obstructed by the drive wheel. Without this, the axle housing can be easily attached to the vehicle body side.

Further, in the invention described in claim 4, since the housing of the fluid pressure motor constituting the cam ring is detachably attached to the axle housing, it is possible to replace the fluid by replacing the motor housing constituting the cam ring. It is possible to change the motor capacity of the pressure motor, that is, the drive torque.

[0017]

An embodiment of the present invention will be described with reference to the drawings.
In this embodiment, a tire roller with a cabin will be described as an example of the pressure roller. First, the overall configuration will be described. As shown in FIG. 1, the tire roller with a cabin is provided with a cabin (driver's cab) 1 on the upper rear side of the vehicle body. Further, three tire guide wheels 2 (front wheels) are arranged at equal intervals in the vehicle width direction on the front part of the vehicle body, and four drive wheels 3 (two left and two right wheels) are provided on the rear part of the vehicle body. Rear wheel)
Is arranged.

Inside the cabin 1, in addition to the driver's seat 4 and the steering wheel 5, various operating levers such as instruments (not shown), a brake pedal, a parking brake lever and the like are arranged. The guide wheel 2 located at the center of the three guide wheels 2 is surrounded by a horizontally arranged rectangular frame 6, and the axle of the guide wheel 2 is rotatably supported by the frame 6. There is. The frame 6 is supported by the yoke 7 from above. Its york 7
Is arranged so as to straddle the guide wheel 2 from above, and
The upper end portion is supported by a front frame 9 of the vehicle body via a swivel bearing 8 so as to be able to swivel around a vertical axis.

A steering wheel 5 is connected to a steering arm 7a extending from the yoke 7 in the vehicle width direction, and in response to an operation of the steering wheel 5,
The guide wheels 2 are steered by the operation of the steering cylinder 8. An engine 10 is arranged at a lower position in front of the cabin 1. The engine 1
0 is a so-called laterally arranged crankshaft (not shown) oriented in the vehicle width direction so that the weight distribution of the vehicle is not biased forward and the weight balance between the front and the rear of the vehicle is secured.

A hydraulic pump 11 is attached to one end (left end) of the engine 10 in the vehicle width direction. The hydraulic pump 11 is rotationally driven by the power transmission from the engine 10 to supply hydraulic oil to a hydraulic motor 12 described later.
Is to be supplied to A return pipe 13 is connected to the inlet of the hydraulic pump 11, and a supply pipe 14 is connected to the outlet. Both of the pipes 13 and 14 are extended rearward in the front-rear direction of the vehicle body, and their ends are connected to the discharge port and the inflow port of the hydraulic motor 12, respectively.

The hydraulic motor 12 is a multi-stroke radial piston motor, as shown in FIGS. This multi-stroke radial piston motor is a known hydraulic motor 12 that is thin and generates low speed and high torque. In the configuration of the hydraulic motor 12, as shown in FIGS. 2 and 3, the cylinder block 16 is coaxially fixed to the outer periphery of the output shaft 15 arranged in the central portion. The cylinder block 16 has a thin cylindrical shape, and a plurality of cylinder blocks (in this embodiment, 8 cylinders) are formed on the outer peripheral surface thereof along the circumferential direction.
Cylinder holes 17 are formed at equal intervals. The cylinder holes 17 are arranged radially around the output shaft 15, and pistons 18 are inserted in the respective cylinder holes 17 so as to be able to move forward and backward. Each piston 18
A roller 18a is rotatably provided at the tip of the roller. Then, each piston 18 has, via its roller 18a, a cam surface 19a of a cam ring 19 arranged on the outer periphery.
Is in contact with The cam ring also serves as the houning of the motor.

Further, hydraulic oil can be supplied to each of the cylinder holes 17 through a passage 22 formed in an axle housing 20 described later. In FIG. 2, 23 is
The hydraulic port is connected to the pipes 13 and 14. When the hydraulic oil flows into each cylinder hole 17, the piston 18 reciprocates within the cylinder hole 17, and the cylinder block 16 rotates due to the reaction force of the roller 18a pressing the cam surface 19a during the movement. The output shaft 15 integrated with the cylinder block 16 is adapted to rotate.

The output shaft 15 of the hydraulic motor 12 having the above-described structure is arranged so as to extend on both sides in the vehicle width direction to form a drive axle. Further, as shown in FIG. 2, the hydraulic motor 12 is provided on both sides of the hydraulic motor 12 in the vehicle width direction.
A pair of axle housings 20,
21 are arranged. The left and right axle housings 20 and 21 are integrated with the motor housing 19 by being bolted to the housing 19 of the hydraulic motor 12, respectively, as shown in FIG. 2 and FIG. 4 viewed from the right side in the vehicle width direction. It has become. The axle housings 20 and 21 are coaxially arranged on the outer periphery of the output shaft 15 and rotatably support the output shaft 15 via a bearing 24.

Here, the right side axle housing 2
0 is provided with a hydraulic port 23 for the hydraulic motor 12, and the hydraulic port 23 communicates with a cylinder hole 17 of the hydraulic motor 12 via a passage 22 formed in the axle housing 20. ing. A wet multi-plate brake 26 is arranged coaxially with the output shaft 15 in the left axle housing 21.

Further, the axle housings 20 and 21
A pair of mounting flanges 27, which are formed apart from each other in the vehicle width direction, are provided at the upper and lower positions, respectively, on the outer peripheral portion of the. The mounting flange 27 has its thickness direction oriented in the vehicle front-rear direction, and has a bolt hole formed in the center thereof. The axle housings 20 and 21 are attached to the bracket 28 provided on the vehicle body frame 29 via the attachment flange 27.

The bracket 28 is composed of a pair of mounting plates 28a opposed to each other in the vehicle width direction. As shown in FIG. 5, the pair of mounting plates 28a hang down from the center portion of the vehicle body frame 29 in the vehicle width direction. ing. The pair of mounting plates 28a are reinforced by being connected by a plurality of reinforcing ribs 37 extending in the vehicle width direction. A substantially semicircular cutout portion 28b corresponding to a half shape of the axle housings 20 and 21 in the circumferential direction is formed in the vertical direction on the end surface of each mounting plate 28a on the rear side in the vehicle body direction. Between the upper end and the lower end of the cutout portion 28b of each mounting plate 28a, a square pillar-shaped mounting block 30 that constitutes an abutting portion is horizontally installed. A bolt hole 30a is formed in the mounting block 30 at a position where it can contact the mounting flange 27 with its axis oriented in the longitudinal direction of the vehicle body.

Then, with the axle housings 20 and 21 engaged with the notches 28b, the mounting flanges 27 provided at the upper and lower ends are brought into contact with the mounting block 30 from the front-rear direction of the vehicle body. Secure with bolts 31. At this time, since the shaft of the bolt 31 is oriented in the front-rear direction of the vehicle body, the drive wheel 3 does not interfere with the left and right drive wheels 3 when the bolt 31 is attached or detached. As a result, the axle housing 20,
21 and the hydraulic motor 12 are simply
It is attached to 9.

In the figure, reference numeral 32 denotes a tank arranged at the rear part of the vehicle body. The output shaft 15 of the hydraulic motor 12 is extended on both sides in the vehicle width direction, and its tip portions 15a and 15b form a drive axle. As shown in FIG. 6, the left and right end portions 15a and 15b of the output shaft 15 are respectively provided with hubs 3 of the drive wheels 3 forming a set of two wheels.
3 are fixed, and two disc wheels 35 are attached to the respective hubs 33 via hub nuts 34. As a result, the tip portion 15a of each output shaft 15,
Two drive wheels 3 are attached to each of 15b.

Next, driving of the tire roller having the above structure will be described. By operating an accelerator pedal, a front-rear switching device, or the like (not shown) in the cabin 1, hydraulic oil is supplied from the hydraulic pump 11 to the hydraulic motor 12 via the pipe 13, so that the hydraulic motor 12 is rotationally driven and output. The shaft 15, that is, the drive wheel 3 rotates normally or reversely, and the tire roller moves forward or backward.

Thus, the output shaft 15 of the hydraulic motor 12
Since a plurality of drive wheels 3 are directly attached to the left and right parts of the vehicle and the power from the engine 10 is transmitted to the drive wheels 3, parts such as a conventional speed reducer and a chain mechanism are not required, and the drive is performed. The structure for driving the wheel 3 can be simplified. Also, because there are no parts such as reducer and chain mechanism in the middle of transmission of drive torque,
It is possible to suppress the occurrence of problems such as the rolling back of the vehicle due to the backlash of the gears and the elongation of the chain. As a result, it is possible to prevent the rolled road surface from being wavy and uneven due to the rolling back of the vehicle.

Here, the vehicle speed is reduced by the hydraulic motor 1 described above.
It is realized by driving 2 at a low speed. In particular, the radial piston motor adopted as the hydraulic motor 12 in the present embodiment is capable of generating low speed and high torque, so there is no problem.
Further, by arranging the engine 10 and the hydraulic pump 11 in the front of the cabin 1, the hydraulic pump 11 in the rear of the cabin 1, and the pipes 13 and 14 on the side of the cabin 1, the bottom of the floor of the driver's seat can be reduced. No components for driving the drive wheels 3 are arranged in the. As a result, the floor of the driver's seat can be lowered, and the position of the cabin 1 can be set low, that is, the vehicle height can be set low.

Further, by using a thin radial piston motor as the hydraulic motor 12, the hydraulic motor 12 can be arranged between the left and right drive wheels 3. Further, the axle housings 20 and 21 integrated with the hydraulic motor 12 are provided with a bracket 28 at a central portion having the largest gap between the drive wheels 3 in the vehicle width direction and attached to the bracket 28. By attaching the flange 27, the axle housing and the hydraulic motor are attached / detached to / from the vehicle body frame.

For this reason, the axle housings 20 and 21 can be attached to and detached from the vehicle body frame with all the drive wheels 3 attached to the output shaft 15, which facilitates assembly and maintenance. In particular, since it has only one hydraulic motor 12 and is a thin motor, even if the hydraulic motors 12 are provided in the axle housings 20 and 21,
The axle housings 20 and 21 integrated with the hydraulic motor 12 do not increase in size and do not hinder the above-described mounting work.

Further, the axle housings 20 and 21
Since the mounting flange 27 provided on the output shaft 15 is disposed at a position between the left and right drive wheels 3, the tip end portions 15a of the output shafts 15,
The mounting flange 27 does not interfere with the mounting of the drive wheel 3 on 15b. This also allows the hub 33 to be replaced without replacing the axle housings 20 and 21.
It is possible to attach tires having different widths simply by exchanging the disc wheels 35.

Further, in the above-described embodiment, an example in which the driving wheels 3 of two wheels are attached to the respective tip portions 15a and 15b of the output shaft 15 is shown. However, as shown in FIG. 15
A set of three drive wheels 3 may be attached to b, or the number of left and right drive wheels 3 may be different, such as one wheel and two wheels.
Further, as the drive wheel 3, a drum-shaped iron wheel forming a compaction wheel may be attached instead of the tire.

The housing 2 of the hydraulic motor 12
Nos. 0 and 21 are detachably bolted to the axle housings 20 and 21. Therefore, by exchanging the motor housing 19 forming the cam ring, the hydraulic motor 12
The capacity, that is, the drive torque, may be changed and used for the roller compaction roller of another model. Further, in the present embodiment, since the brake structure is directly connected to the output shaft 15, the structure is such that the axle rotating at a low speed is braked, and the life of the brake is extended. In the conventional drive mechanism, since the brake 26 is located at the input shaft side of the speed reducer, the rotating shaft rotating at high speed is braked.

In the above embodiment, a multi-stroke radial piston motor is adopted as the hydraulic motor 12, but the invention is not necessarily limited to this, and another known hydraulic motor 12 may be adopted. . Further, in the above embodiment, the mounting flanges 27 provided on the axle housings 20 and 21 are formed in pairs at the upper part and the lower part, respectively, but the invention is not limited to this.

However, as in this embodiment, the mounting bolt 3
When the axis 1 is set to face the front-rear direction of the vehicle body, the work can be easily performed without being obstructed by the drive wheels 3 on both sides when the bolt 31 is attached and detached. Further, the brake 26 is not limited to the wet multi-disc brake, and another brake device such as a single disc disc brake may be adopted.

[0039]

As described above, in the pressure roller according to the present invention, the drive torque of the fluid pressure motor can be directly transmitted to the drive wheels. This is unnecessary and simplifies the structure for driving the drive wheels, and also has the effect of avoiding the occurrence of problems due to backlash of gears and elongation of the chain.

Further, since the above-mentioned speed reducer is unnecessary and the left and right driving wheels are driven by only one hydraulic motor, the parts for transmitting the driving torque to the driving wheels can be miniaturized. There is. Further, since each tip of the output shaft has a length to which a plurality of wheels can be attached, respectively, a plurality of wheels can be attached to each tip of the output shaft and the axle housing can be replaced. Without doing so, it is possible to attach the drive wheels having different widths by replacing the disc wheel or the hub attached to the tip portion.

Further, when the invention according to claim 2 is adopted, the axle housing can be attached to or removed from the vehicle body frame with all the drive wheels attached to the output shaft that is integral with the axle housing. It becomes possible, and the assembling property and the maintainability are improved. At this time, since the drive wheels on the left and right are relatively spaced apart from each other in the vehicle width direction, the work of attaching / removing the axle housing to / from the vehicle body frame is easy. Further, since the attachment portion of the axle housing to the vehicle body frame is provided between the left and right drive wheels, the attachment portion does not interfere with the attachment of the drive wheel to each tip of the output shaft. Therefore, the workability of exchanging the left and right drive wheels is good.

When the invention described in claim 3 is adopted, even if the drive wheel is attached to the output shaft, the axle housing can be easily attached / detached to / from the vehicle body side without being disturbed by the drive wheel. There is an effect that it becomes possible. Further, when the invention according to claim 4 is adopted, since the cam ring is replaceable, it becomes possible to change the motor capacity of the fluid pressure motor, that is, the drive torque, by replacing the cam ring. The effect is that it is possible to support multiple types of roller compaction rollers by simply replacing.

[Brief description of drawings]

FIG. 1 is a side view showing a tire roller with a cabin according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the relationship between the hydraulic motor, the axle housing, and the output shaft of the embodiment according to the present invention.

FIG. 3 is a sectional view showing a multi-stroke radial piston motor as a hydraulic motor of an embodiment according to the present invention.

FIG. 4 is a view showing the coupling between the housing of the hydraulic motor and the axle housing as seen from the axial direction of the output shaft of the embodiment according to the present invention.

FIG. 5 is a side view showing the attachment of the axle housing of the embodiment according to the present invention to the vehicle body frame.

FIG. 6 is a diagram showing how drive wheels are attached to an output shaft according to an embodiment of the present invention.

FIG. 7 is a diagram showing another example of how the drive wheels are attached to the output shaft according to the embodiment of the present invention.

FIG. 8 is a view showing a conventional pressure roller.

[Explanation of symbols]

 3 Drive Wheel (Rear Wheel) 11 Hydraulic Pump 12 Hydraulic Motor 15 Output Shaft 15a, 15b Tip of Output Shaft 19 Motor Housing 20, 21 Axle Housing 27 Mounting Flange 28 Bracket 29 Body Frame 30 Mounting Block (Abutting Part)

Claims (4)

[Claims] 1. A rolling roller for driving a drive wheel by a fluid pressure motor, wherein the fluid pressure motor is arranged at a central portion or a substantially central portion in a vehicle width direction, and a housing of the fluid pressure motor is provided on both sides in a vehicle width direction. A rolling roller, wherein each output shaft is projected, and one or more drive wheels are attached to each projection of the output shaft. 2. A housing of the fluid pressure motor is fixed to an axle housing that rotatably supports the output shaft, and the axle housing is attached to the vehicle body side between the left and right drive wheels. The pressure roller according to claim 1. 3. A mounting flange provided on the axle housing having a bolt hole opening in the vehicle front-rear direction, and an abutting portion provided on the vehicle body frame and capable of contacting the mounting flange in the vehicle front-rear direction. The rolling roller according to claim 2, further comprising: a bracket having the holding member, wherein the mounting flange and the abutting portion are joined by a bolt having a shaft oriented in the front-rear direction of the vehicle body. 4. The fluid pressure motor is a radial piston motor whose housing constitutes a cam ring, and the housing of the fluid pressure motor is detachably fixed to the axle housing. Alternatively, the pressure roller according to claim 3.