JP2006188118A - Oil filter of hst charge circuit of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To install an oil filter of an HST charge circuit of a working vehicle at an easy-to-access portion except for an HST unit with noise problems due to pulsation of oil emitted from a charge pump eliminated, and with low manufacturing costs. <P>SOLUTION: This oil filter is mounted to a bracket mounted to a vehicle body frame of a working vehicle via a cushioning member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an oil filter installation structure used in a charge circuit of a hydrostatic transmission (HST) installed in a work vehicle such as a wheel loader.

Typical examples of work vehicles equipped with a hydrostatic transmission (hereinafter sometimes abbreviated as “HST”) include wheel loaders and agricultural work vehicles. A typical HST includes a hydraulic pump and a hydraulic motor attached as a HST unit to a power source such as an engine. Since this HST is configured as a closed hydraulic circuit, it is provided with a charge circuit having a charge pump for replenishing the drain oil of the equipment. The charge circuit is provided with a charge pump and an oil filter through which discharged oil flows.

A typical example of an oil filter is formed as a spin-on filter in which a filter element is integrated in a case. In a preferred installation example, the filter is directly attached to an HST unit and installed in an easily accessible place for maintenance. (For example, refer to Patent Document 1).
JP-A-6-199140

The oil filter of the HST charge circuit having the above-described configuration has the following problems that are desired to be improved.

access:
When a relatively small work vehicle is equipped with a power source engine and an HST unit inside the body frame, it is difficult to secure a sufficient space for attaching and removing the spin-on filter when the oil filter is directly attached to the HST unit. It is difficult to access for maintenance such as regular replacement of oil filter.

noise:
When the oil filter is installed in a place other than the HST unit, the pulsation vibration of the discharge oil of the charge pump may propagate to the installation place and generate noise, and the installation part is made as rigid as the HST unit, or like an accumulator A pulsation reducing means is required and the manufacturing cost is high.

The present invention has been made in view of the above-mentioned facts, and its technical problem is caused by pulsation of charge pump discharge oil in an oil filter of an HST charge circuit of a work vehicle in an easily accessible place other than the HST unit. It is an object of the present invention to provide an oil filter for an HST charge circuit of a work vehicle, which eliminates the problem of noise and is installed at a low manufacturing cost.

According to the present invention, in order to solve the above technical problem, an oil filter provided in an HST charge circuit of a work vehicle equipped with HST is attached to a bracket attached to a body frame of the work vehicle via a buffer member. An oil filter for an HST charge circuit is provided.

Preferably, the bracket includes a flat plate portion having a plurality of mounting holes for mounting the oil filter, and the buffer member sandwiches the flat plate portion between the body portion inserted into the mounting hole and both axial sides thereof. The oil filter is formed in a cylindrical shape having a collar portion, and is positioned on one surface side of the flat plate portion, and is attached to the bracket via the buffer member by a screw member inserted through the buffer member. The vehicle body frame includes a pair of frames extending in the front-rear direction of the work vehicle with an interval in the width direction of the work vehicle, the HST being provided between the pair of frames, and at least one of the pair of frames. The bracket is attached.

The oil filter of the HST charge circuit configured according to the present invention is attached to a bracket attached to a vehicle body frame of a work vehicle via a buffer member. Therefore, the oil filter can be installed at an easily accessible location other than the HST unit by a bracket, with a buffer member interposed, eliminating the problem of noise caused by the pulsation of the charge pump discharge oil, and at a low manufacturing cost. .

Hereinafter, an oil filter of an HST charge circuit configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a wheel loader which is a typical work vehicle.

First, the wheel loader will be described with reference to FIG. A wheel loader generally indicated by numeral 2 includes a front vehicle body 4 and a rear vehicle body 6, and the front vehicle body 4 includes a working device 10 and a front wheel device 12 having a bucket 8, and the rear vehicle body 6 includes a cab 14, an engine compartment. 16 and a rear wheel device 18 are provided. The front vehicle body 4 and the rear vehicle body 6 are connected to each other with a refraction steering freely around a vertical axis 20.

The rear vehicle body 6 is equipped with a hydrostatic transmission (hereinafter abbreviated as “HST”) together with the engine, and the mechanical output of the HST is connected to the front wheel device 4 and the rear wheel device 18.

1 will be described with reference to FIG. 2, which is an enlarged cross-sectional view of a portion of the rear vehicle body 6 equipped with HST in FIG. An HST 24 including a hydraulic piston pump and a hydraulic piston motor is directly attached to the engine 22. The wheel loader 2 has a pair of frames 26a extending in the front-rear direction (the left-right direction in FIGS. 1 and 2) at an interval in the width direction (the direction perpendicular to the paper surface in FIG. 1, the up-down direction in FIG. 2). , 26b. The pair of frames 26a and 26b are formed substantially the same and are integrally connected by a connecting frame 26c. The engine 22 and the HST 24 are installed between the pair of frames 26a and 26b.

The HST 24 includes a charge pump 24a for the charge circuit. An oil filter 28 through which oil discharged from the charge pump 24a flows is attached to a bracket 30 attached to the inside of one frame 26a of the pair of frames 26a and 26b. Is attached via a buffer member 32. The HST 24 and the oil filter 28 are connected by a pair of hydraulic hoses 34a and 34b.

This will be described with reference to FIGS. 3 and 4 together with FIG. The oil filter 28 itself may be a well-known one, and includes a base 28a to which the hydraulic hoses 34a and 34b are connected, and a spin-on type filter cartridge 28b that is detachably attached to the base 28a and has a case with a built-in filter element. ing. The base 28a is formed with four screw holes 28c (FIG. 4) for attachment to the bracket 30 on the opposite side of the filter cartridge 28b attachment portion.

The bracket 30 is formed of a substantially strip-shaped horizontally extending steel plate, and includes a base portion 30a attached to the frame 26a at one end and a flat plate portion 30b attached to the oil filter 28 at the other end. The base 30a is formed by bending a strip connected to the flat plate portion 30b at a right angle upward, and a reinforcing rib 30c is provided at the right angle portion. The flat plate portion 30b is provided with four mounting holes 36 (FIG. 4) arranged in a rectangular shape.

The base 30a is attached to the screw hole flat plate boss 26d of the frame 26a by four bolts 38.

The buffer member 32 will be mainly described with reference to FIG. 4. The buffer member 32 is formed of synthetic rubber such as chloroprene rubber, and has a body portion 32 a inserted through each of the mounting holes 36, and flat plate portions 30 b of the bracket 30 on both sides in the axial direction. It is formed in a grommet shape having a collar portion 32b sandwiching the sleeve, and a steel cylindrical spacer 32c extending between the ends of the pair of collar portions 32b and 32b is integrally bonded to the trunk portion 32a. .

In order to attach the oil filter 28 to the bracket 30, the buffer member 32 is inserted into each of the four mounting holes 36 of the bracket 30, and the hard washers 40 are brought into contact with the flange portions 32 b at both ends of the buffer member 32, respectively. 28 is positioned with the base 28a on the lower surface of the flat plate portion 30b and the filter cartridge 28b facing downward, and a bolt 42 as a screw member is inserted into the spacer 32c of the buffer member 32 from the upper surface side of the flat plate portion 30b. Screw into hole 28c. Thus, the oil filter 28 is attached to the bracket 30 via the buffer member 32.

The operation of the oil filter of the HST charge circuit as described above will be described.

The oil filter 28 is attached to a bracket 30 attached to the vehicle body frame 26 of the work vehicle 2 via a buffer member 32 between the bracket 30 and the oil filter 28. Therefore, the oil filter 28 can be easily accessed by the bracket 30 other than the HST unit 24, and the buffer member 32 is interposed to eliminate the problem of noise caused by the pulsation of the charge pump discharge oil. Can be installed. The bracket 30 does not need to be a strong rigid body in combination with the buffer member 32.

Since the buffer member 32 may have a cylindrical grommet shape having a barrel portion 32a inserted into each mounting hole 36 of the bracket 30 and a flange portion 32b sandwiching the flat plate portion 30b of the bracket 30 on both sides in the axial direction thereof. It is easy to obtain and easy to install, and the manufacturing cost can be reduced.

The bracket 30 may be attached to at least one of the pair of frames 26a and 26b of the vehicle body frame 26. Therefore, installation is easy.

The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications or corrections can be made within the scope of the present invention, for example, as described below. Is.

The bracket to which the oil filter 28 is attached may be attached to a connecting frame 26c (FIG. 2) that is integrally extended to both the pair of frames 26a and 26b.

The side view of the wheel loader which is a typical example of the working vehicle provided with the oil filter of the HST charge circuit comprised according to this invention. The expanded sectional view of the part equipped with HST seeing in the AA arrow direction of FIG. FIG. 3 is an enlarged view showing an oil filter installation portion rotated 90 degrees in the direction of arrows BB in FIG. 2. The expanded sectional view of a buffer member attaching part.

Explanation of symbols

2: Wheel loader (work vehicle)
24: Hydrostatic transmission (HST)
26: body frame 28: oil filter 30: bracket 32: buffer member

Claims (3)

An oil filter provided in an HST charge circuit of a work vehicle equipped with HST,
The oil filter is attached to a bracket attached to a vehicle body frame of a work vehicle via a buffer member.
An oil filter for an HST charge circuit of a work vehicle. The bracket includes a flat plate portion having a plurality of mounting holes for mounting the oil filter,
The shock-absorbing member is formed in a cylindrical shape having a body portion inserted through the mounting hole and a flange portion sandwiching the flat plate portion on both sides in the axial direction thereof,
The oil filter is positioned on the one surface side of the flat plate portion, and is attached to the bracket via the buffer member by a screw member inserted through the buffer member.
The oil filter of the HST charge circuit of the work vehicle according to claim 1 characterized by things. The vehicle body frame includes a pair of frames extending in the front-rear direction of the work vehicle at intervals in the width direction of the work vehicle;
The HST is equipped between a pair of frames, and the bracket is attached to at least one of the pair of frames.
3. An oil filter for an HST charge circuit of a work vehicle according to claim 1 or 2.

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