JPH0510061U - Axle drive - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Prevent bubbles mixed in the hydraulic oil filled in the axle case containing the hydraulic transmission from being sucked into the hydraulic transmission, and replace the oil filter Arrange to be long. An axle drive (2) in which a hydraulic transmission is installed, wherein an imaginary line connecting an axis of an output shaft of the transmission and an axis of an axle substantially coincides with a dividing line of the axle case. In the device, an oil filter 24 communicating with the hydraulic oil supply circuit of the hydraulic transmission is arranged on the dividing line of the axle case.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an arrangement configuration of an oil filter that cleans hydraulic oil stored in an axle case in an axle drive device equipped with a hydraulic transmission when replenishing hydraulic fluid for the hydraulic transmission.

[0002]

[Prior Art]

 Conventionally, an axle drive device in which a hydraulic transmission is installed, wherein an imaginary line connecting an output shaft axis of the transmission and an axle shaft of the transmission is substantially aligned with a dividing line of the axle case. Therefore, a technique is known in which an oil filter communicating with the hydraulic oil supply circuit of the hydraulic transmission is arranged on the back surface of the center section. For example, it is a technique disclosed in Japanese Patent Laid-Open No. 1-309821.

[0003]

[Problems to be solved by the device]

 For the axle drive, it is necessary to fill the hydraulic case of the hydraulic transmission in the axle case, but it is difficult to completely fill the case with hydraulic oil, and air is always mixed in. is there. When such an axle drive is operated, air bubbles are mixed with the hydraulic oil and air is trapped on the back surface of the center section.When the vehicle starts, air is sucked together with the hydraulic oil that is supplied to the closed circuit of the hydraulic transmission. However, noise and start time lag due to cavitation were occurring. Also, because the oil filter was located at the bottom of the axle case, it directly sucked in foreign substances such as iron powder that had accumulated at the bottom, clogged immediately, and had to be replaced in a short period of time.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention is an axle case in which a hydraulic transmission is installed, and an imaginary line connecting the axis of the output shaft of the transmission and the axis of the axle is an axle case. In the axle drive device that is substantially aligned with the dividing line of No. 3, an oil filter communicating with the hydraulic oil supply circuit of the hydraulic transmission is arranged on the dividing line of the axle case.

[0005]

【Example】

 The problems to be solved by the present invention and the means for solving the problems are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described. 1 is a plan sectional view of the axle case with the upper half case removed, FIG. 2 is a front sectional view of the axle case, FIG. 3 is a perspective view of an oil filter mounting portion, and FIG. 4 is a second embodiment. FIG. 5 is a side sectional view, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is a perspective view of the oil filter mounting portion.

1, 2, and 3, a hydraulic transmission E, an axle 4, and a power transmission means for interlocking and connecting the hydraulic transmission E are internally provided in an axle case. The axle case is composed of a half upper case 1 and a half lower case 2, and the dividing lines are the output shaft of the hydraulic transmission, the motor shaft axis, the power transmission shaft axis, and the axle 4 axis. It is configured so as to substantially coincide with an imaginary line that connects the cores in a straight line. A reserve tank 35 is arranged on the upper half case 1, and hydraulic oil is filled in the axle case. The hydraulic transmission E has a center section 10 on which a hydraulic pump P and a hydraulic motor M are mounted. The center section 10 is L-shaped in cross section, and a hydraulic pressure is provided on a horizontal portion 10 a of the center section 10. A pump P is mounted and a hydraulic motor M is mounted on the vertical portion 10b.

In the hydraulic pump P, a pump shaft 11 is rotatably erected in the center of a horizontal portion 10 a, a cylinder 21 is fitted on the pump shaft 11, and pistons 22. Are arranged around the pump shaft 11, and the pistons 22, 22 ... Are urged by springs so that their heads are brought into contact with the variable swash plate 13, and the variable swash plate 13 is attached to the transmission shaft 14. The angle can be changed by rotating the fixed arm 15, and the rotation direction and the rotation speed of the motor shaft 16 can be changed by adjusting the discharge direction and discharge amount of the pressure oil of the hydraulic pump P.

In the hydraulic motor M, one side of the motor shaft 16 is pivotally supported at the center of the outer surface of the vertical portion 10b of the center section 10, and the other end is supported by the split surface of the axle case. The brake drum 17 is fixed to the. A cylinder 25 is externally fitted to the motor shaft 16, and a plurality of pistons 26, 26, ... Are arranged around the motor shaft 23 in the cylinder 25. The pistons 26, 26 ,. The head is brought into contact with the fixed swash plate 27.

Further, an engraved gear 16 a is engraved on the motor shaft 16, a gear 31 on a counter shaft 30 is meshed with the engraved gear 16 a, and the engraved gear is engraved on the counter shaft 30. The ring gear 32 of the differential device D is engaged with 30a to drive the axle 4.

In the center section 10 between the cylinder 21 and the cylinder 25, oil passages 10c and 10d for discharge and return oil are bored to connect the hydraulic pump P and the hydraulic motor M, Check valves 19a and 19b are fitted at the ends of the oil passages 10c and 10d, and an oil passage 10e is formed at a right angle so that the check valves 19a and 19b communicate with both of the oil passages 10c and 10d. The end of the oil passage 10e is opened at the end of the oil passage 10f, and the oil passage 10f is opened obliquely upward so that air can be easily removed. The oil filter 24 is provided between the opening of the oil passage 10f and the axle case. Is fitted.

The mounting portion of the oil filter 24 is arranged at the end opposite to the hydraulic motor M on the dividing line between the upper half case 1 and the lower half case 2, and the upper half case 1 and the lower half case. Oil filter support portions 1a and 2a are partially projected inside the case 2, and receiving portions 1b and 2b are formed on the oil filter support portions 1a and 2a so as to match the shape of the oil filter 24.

Then, the wall surface of the center section 10 on the side where the oil passage 10f is opened is brought into close contact with the side surface of the oil filter support portion 2a opposite to the receiving portion 2b, and the oil filter support portion 2a A cutout 2c is provided in a portion facing the path 10.

Therefore, when the oil filter 24 is sandwiched between the two support parts 1a and 2a by the attachment of the upper half case 1 and the lower half case 2, the oil filter 24 floats inside the axle case and While the outside is partitioned, the notches 2c form an oil passage due to the attachment of the support portions 1a and 2a, and the inside of the oil filter 24 is connected to the oil passage 10f.

The axle drive device of the present invention is mounted on a vehicle with the pump shaft 11 facing upward, or with the pump shaft 11 facing forward, depending on the engine installation form of the traveling vehicle. In any case, the state in which the oil filter 24 is installed at the substantially central position of the axle case does not change.

By thus disposing the oil passage and the oil filter 24, the release rods 20 and 20 inserted into the check valves 19a and 19b are pushed from the side of the center section 10 to push the hydraulic pump P and the hydraulic motor M. The motor shaft 16 can be freely rotated by draining the pressure oil in the closed circuit between the oil passages 10e and 10f, and the release rods 20 and 20 rotate the release lever 23 provided outside the axle case. It will be slid by. When the hydraulic oil in the closed circuit leaks and becomes negative pressure, the hydraulic oil is supplied to the oil passages 10b and 10c through the oil filter 24, the oil passages 10f and 10e, and the check valves 19a and 19b. Is done.

As another embodiment, as shown in FIGS. 4, 5 and 6, communication holes 34c and 34d are opened obliquely upward in the holding members 34a and 34b of the check valves 19a and 19b. The oil filter 24 'is arranged in the receiving portions 1b', 2b 'so that both the communication holes 34c, 34d are located inside, and the shape of the oil filter 24' is limited to a cylindrical shape or a prismatic shape. I don't.

[0017]

[Effects of the Invention] With the above-mentioned configuration, the following effects can be obtained. That is, when the axle drive is operating, the hydraulic oil in the axle case is in a state of agitating the air bubbles, and when the operation is stopped, they collect and air can be collected on the inner wall of the case. Since the filter is located approximately in the center of the top and bottom of the axle case, and the circumference of the oil filter is open to the inside of the axle case, the air inside the oil filter can easily escape from the inner wall to the top of the case, and It was possible to prevent this from occurring, and when starting, it was possible to eliminate the noise due to cavitation and the start time lag by not sucking air together with the supplemental hydraulic oil into the closed circuit of the hydraulic transmission. In addition, the oil filter is less likely to be clogged with foreign matter such as iron powder that has accumulated on the bottom of the axle, making it possible to use it for a long time.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a state in which a half upper case of an axle case is removed.

FIG. 2 is a front sectional view of an axle case.

FIG. 3 is a perspective view of an oil filter mounting portion.

FIG. 4 is a side sectional view showing a second embodiment.

5 is a cross-sectional view taken along the line AA in FIG.

FIG. 6 is a perspective view of an oil filter mounting portion.

[Explanation of symbols]

 E Hydraulic transmission P Hydraulic pump M Hydraulic motor 1 Half upper case 2 Half lower case 10 Center section 10c, 10d, 10e, 10f Oil passage 4 Axle 24 Oil filter

Claims (1)

[Claims for utility model registration] Claims: 1. In an axle case incorporating a hydraulic transmission, an imaginary line connecting the axis of the output shaft of the transmission and the axis of the axle is a parting line of the axle case. In the axle drive device which is substantially the same as the above, the axle drive device is characterized in that an oil filter communicating with a hydraulic oil supply circuit of the hydraulic transmission is arranged on the dividing line of the axle case.