JPS6328006Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a transmission device for a mobile working machine such as a tractor.

More specifically, a hydraulic clutch has a plurality of built-in hydraulic clutches as a transmission, and by selecting engagement/disengagement of the hydraulic clutches with a hydraulic switching valve, selects one set of a plurality of gear trains that are always engaged and changes gears. This is an idea related to a type transmission.

(b) Prior Art Techniques relating to hydraulic clutch devices are known, such as those disclosed in Japanese Utility Model Application No. 53-147378 and Japanese Utility Model Application Publication No. 52-42978.

(c) Problems that the invention attempts to solve However, the first prior art
In the case of the technology described in Publication No. 147378, there are 2 internal
Since it is necessary to assemble the hydraulic clutch device between the walls of the case that has separate walls, the hydraulic clutch device and the shaft cannot be integrated together.
Assembly was complicated because the shaft for the hydraulic clutch and the parts of the hydraulic clutch device had to be inserted into the case separately and then assembled with high precision within the narrow case.

In contrast, in the present invention, the seal case 71 is fitted to the part of the first shaft that protrudes into the main clutch housing 3, and the hydraulic clutch is operated with the first shaft being cantilever-supported by the rear end wall 3a and the seal case 71. The device can be assembled to the shaft to form an assembly, and the assembly can be easily performed by inserting the assembly into the transmission case 2.

In addition, the second conventional technology, Utility Model Application No. 52-42978
In the above publication, support plates for the first and second shafts, called oil passage plates and center plates, were separately provided between the main clutch housing and the transmission case.

In the present invention, the support plate is constructed integrally with the main clutch housing 3 as the rear end wall 3a, thereby reducing the number of parts, and conventionally, when tightening during assembly, it is necessary to incorporate a hydraulic clutch device and assemble the support plate. Although it was a hassle to do it at the same time,
This point could also be improved.

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

The main clutch housing 3 is located on the rear of the engine 1.
Mission case 2, rear axle housing 1
In a configuration in which the hydraulic clutch type transmission is housed in the transmission case 2, the main clutch housing 3 is connected to the front end of the transmission case 2. A rear end wall 3a is integrally provided in the housing 3, and an opening is formed at the front end of the transmission case 2 so that the hydraulic clutch type transmission can be installed therein.
The rear end wall 3a and the wall portion 2c support both ends of the first shaft supporting the hydraulic clutch type transmission by bearings, and the front end of the first shaft 19 is extended from the rear end wall 3a of the main clutch housing 3. A seal case 71 that protrudes forward and connects with the main clutch shaft 16, and inherits the oil passage on the case side and the oil passage on the first shaft side is fitted in the portion where the first shaft 19 protrudes from the rear end wall 3a. , the seal case 71 is attached to the front surface of the rear end wall 3a.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side view of a tractor equipped with the hydraulic clutch type transmission of the present invention.

An engine 1 is contained within a bonnet 10, the rear end of the engine 1 is fastened to the tip of a main clutch housing 3, and a transmission case 2 is fixedly installed at the rear of the main clutch housing 3. Furthermore, a rear axle housing 13 is fastened to the rear part of the housing, and the whole constitutes a chassis.

The front wheels 4 are mounted under the bonnet 10, the rear wheels 5 are mounted under the rear axle housing 13, a three-point linkage hitch device 6 for mounting a work implement is mounted on the rear of the rear axle housing 13, a seat device 8 is mounted on the top surface, and fenders 7 are mounted on the sides. A steering device 9 is disposed above the main clutch housing 3. The essential parts of this device are located inside the transmission case 2.

At the top of the transmission case 2, a main shift lever 14 projects upward from the main shift chamber 2a, and an auxiliary shift lever 15 projects upward from the auxiliary shift chamber 2b. A muffler 11 is provided to protrude above the bonnet from the side of the engine 1.

FIG. 2 is a power transmission diagram of the hydraulic clutch type transmission of the present invention.

The driving force from the engine 1 passes through the hydraulic clutch type transmission A to the auxiliary transmission B, from the rear axle housing 13 to the rear shaft 5, and the other transmission system passes through the PTO transmission D to the PTO shaft 25.
Used to drive work equipment. The support device for the main transmission A, which is a hydraulic clutch type transmission in this transmission diagram, is the essential part of the present invention.

That is, the rotational force of the engine 1 is connected and disconnected by the main clutch 90, and the main clutch shaft 16 is connected and disconnected by the coupling 91.
The hydraulic clutch devices 26a, 26b,
Two pairs of 27a and 27b are installed back to back.

The first shaft 19 is supported by a rear end wall 3a that is integrated with the main clutch housing 3, and a gear pump 18 is tightly attached to the wall 2c of the transmission case 2 at a portion where the shaft 19 projects into the sub-transmission chamber 2b. It is set up.

Further, a seal case 75 is provided at a portion where the front end of the first shaft 19 projects into the main clutch housing 3. The first shaft 19 passes through the inside of the sub-transmission device B, reaches the rear axle housing 13, and reaches the PTO transmission shaft 23 at a coupling 24. PTO gear shift shaft 2
A PTO shaft 25 is provided in parallel with PTO shaft 23 and PTO shaft 25, and PTO speed change is performed between this PTO speed change shaft 23 and PTO shaft 25.

A second shaft 20 is installed in parallel to the lower part of the first shaft 19 in the hydraulic clutch type transmission A, and the hydraulic clutch free rotating gears 33, 34, 35, 36 on the first shaft and the fixed shaft on the second shaft are connected to each other. The installed gears 28, 29, 30, and 31 are always in mesh with each other. Since the combination of the free rotation gear 33 and the fixed gear 28 is a gear train for backward movement, they mesh with each other via the free rotation gear 32 therebetween. The combination of the idling gear 34 and the fixed gear 29 is the first forward speed, and the combination of the idling gear 35 and the fixed gear 30 is the second forward speed.
The combination of the idle gear 36 and the fixed gear 31 is the third forward speed.

Idle gears 33, 34, 35, 36 are connected to driven friction plates 33b, 34b, 35b, 36b of hydraulic clutches 26a, 26b, 27a, 27b, and hydraulic pistons 33c, 34c, 35c, 36c.
Due to the operation of the drive friction plates 33a, 34a, 35
a, 36a are driven friction plates 33b, 34b, 35
b, 36b, the fixed gears 28, 29, 36b transmit power to the idling gears 33, 34, 35, 36 through the hydraulic cylinder, and are always in mesh with the fixed gears 28, 29, 36b.
The second shaft 20 is rotated from 30 and 31.

The hydraulic clutches 26a and 26b are integrally constructed back to back, and similarly the hydraulic clutches 27a and 27b are integrally constructed back to back, which is effective in downsizing the hydraulic clutch device. The second shaft 20 is provided to protrude further from the wall 2c of the mission case 2, and the gear pump 1 is provided on the protrusion on the first shaft.
The traveling drive shaft 22 is loosely fitted and supported at the position where 8 ends.

The first shaft has its front end supported by a rear end wall 3a integrally constructed with the main clutch housing 3, and its rear end supported by a bearing on a wall 2c provided inside the transmission case 2, and then attached to the pump shaft 17. They are connected using a pump gear 18a as a coupling.

A sub-transmission small-diameter gear 37 is fixed to the rear end of the second shaft 20, and is always in mesh with a large-diameter gear 40 among the sub-transmission loosely fitted gears 40, 41, 42, 43 loosely fitted to the pump shaft 17. . The auxiliary transmission loosely fitted gear 41 is a third-speed auxiliary transmission gear, and constitutes the third auxiliary transmission by meshing with the sliding gear 29 on the traveling drive shaft 22. The auxiliary transmission loose fit gear 41 and the sliding gear 44 constitute a second auxiliary transmission speed, and the auxiliary transmission loose fit gear 42 and the sliding gear 45 constitute a auxiliary transmission first speed. Further, by directly connecting the sliding internal gear 38 to the auxiliary transmission small diameter gear 37, a fourth auxiliary transmission speed is constructed.

A bevel gear 46 is provided at the rear end of the traveling drive shaft 22, and the bevel gear 46 and the differential gear bevel gear 47 are connected to each other.
are engaged, and the power is transmitted to the rear shaft 5 after being decelerated by the traveling transmission gears 49 and 50 via the differential device 48. A brake device 1 is installed on the outside of the travel gear 49.
00 is set.

The pump shaft 17 is connected to the PTO speed change shaft 23 by a coupling 24, and spline sliding gears 51 and 52 are slid on the front portion of the PTO speed change shaft 23, and loosely fitted gears 56 and 57 are loosely fitted on the rear half of the PTO speed change shaft 23. do.

On the PTO shaft 25 are loosely fitted gears 53, 54, 55,
58, and sliding clutch pieces 60 and 62 that are spline-fitted and slide on the PTO shaft 25 are provided. A fixed clutch piece 59 is provided at the base of the loosely fitted gear 55, and a fixed clutch piece 61 is provided at the base of the loosely fitted gear 58. The loosely fitted gears 56 and 57 on the PTO transmission shaft 23
The loosely fitted gears 55 and 58 on the PTO shaft are always engaged.

The first stage of PTO transmission is a sliding gear 51 and a loosely fitted gear 5.
3 are engaged, and the sliding clutch piece 62 and the fixed clutch piece 61 are engaged. In the second PTO gear shift, the sliding gear 51 is similarly engaged with the loosely fitted gear 53, and the sliding clutch piece 60 is fixed. clutch piece 5
This is the case when the mesh is engaged with 9.

The third stage of the PTO transmission has a sliding gear 52 loosely fitted into the gear 5.
4, when the sliding clutch piece 62 is engaged with the fixed clutch piece 61, the fourth PTO gear shift similarly engages the sliding gear 52 with the loosely fitted gear 54, and the sliding clutch piece 60 is engaged with the fixed clutch piece 59. This is the case when they mesh together.

The transmission system is as described above.

FIG. 3 is a side longitudinal cross-sectional view showing the main clutch housing 3, transmission case 2, rear axle housing 13, and hydraulic switching valve V section.

Hydraulic clutch devices 26a, 26b, 27a, 27b are installed in the sub-transmission chamber 2a on the first shaft 19, and fixed gears 28, 29, 3 are mounted on the second shaft below.
0 and 31 are fixed. The reversing gear 32 is supported by a cantilever on the rear end wall 3a of the main clutch housing 3. A seal case 71 is protruded into the main clutch housing 3 immediately after the coupling 91 connecting the main clutch shaft 16 and the first shaft 19. The seal case 71 is closely fixed to the front surface of the rear end wall 3a, and is connected to the hydraulic clutches 26a, 26b, 27a,
It serves to transfer the high pressure oil for 27b to the oil passage in the first shaft.

As a route for high-pressure oil, the hydraulic oil that also serves as lubricating oil sucked by the oil filter 81 in the rear axle housing 13 is routed through piping or an oil passage carved or drilled in the wall 2c of the transmission case 2. The oil path reaches the hydraulic direction switching valve V provided on the upper part of the mission case 2, and after the direction of the oil path is determined by the spool 65, the oil path 64 is opened in the mission case wall and the front wall of the mission case 2. The front end of the first shaft 19 is guided into the seal case 71 by an oil passage (not shown) formed between the rear end face 3a of the clutch housing and the rear end face 3a of the clutch housing, and after passing through the oil passage inside the seal case 71. Oil passages 67 for reverse, 1st speed, 2nd speed, and 3rd speed opened in the
Enter 68, 69, 70.

These oil passages 67, 68, 69, and 70 pass through an in-shaft oil passage fitted within the shaft, and then reach hydraulic clutch pistons 33c, 34c, 35c, and 36c. Therefore, hydraulic clutches 26a, 26b, 27
The oil passage for moving a and 27b is the gear pump 18.
An oil passage for the hydraulic directional control valve V is provided on the upper wall of the transmission case 2, and an oil passage for the seal case is provided on the rear end of the clutch housing. It is provided on the wall 3a. The seal case 71 functions to take over the oil passage in the rear end wall 3a and the oil passage in the rotating first shaft 19.

Therefore, parts related to oil passages necessary for hydraulic clutch type shifting are arranged on the first shaft. First, seal case 7 inside the clutch housing.
1 has a hydraulic clutch device 26 in the main transmission chamber 2a.
A, 26b, 27a, and 27b are provided with a gear pump 18 in the sub-transmission chamber 2b.

Further, an inertial slip prevention brake device 93 is provided on the front wall surface of the rear end wall 3a of the main clutch housing 3 under the seal case 71. The inertial slip prevention brake 93 prevents the second and subsequent shafts from continuing to rotate due to the inertial weight of the hydraulic clutch even when the hydraulic clutch type main transmission is in neutral, and also prevents the second and subsequent shafts from continuing to rotate when the hydraulic clutch type main transmission is in neutral. This is provided for the purpose of preventing the hydraulic clutch and the second shaft and the following from rotating.

The inertial slip prevention brake device 93 is a piston 93
a, a cylinder 93b, and a friction plate 93c fixed to the tip of the piston 93a. High-pressure oil from a gear pump is fed into the cylinder in conjunction with the operation of the clutch pedal 94, and the friction plate 93
c is pressed against the tip of the second shaft to forcibly stop the rotation of the second shaft, thereby stopping idling and twisting. An oil passage for an inertial slip prevention brake is also cut into the front wall of the rear end wall 3a of the main clutch housing.

Figure 4 shows the installation inside the rear axle housing.
It is a detailed diagram of the PTO transmission device D.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, in the case of the conventional technology described in Japanese Utility Model Application Publication No. 53-147378, it is necessary to assemble a hydraulic clutch device between the walls of a case that has two internal walls. However, it is not possible to integrate the hydraulic clutch device and the shaft into one, so the shaft for the hydraulic clutch and the parts of the hydraulic clutch device must be inserted into the case separately, and then assembled with high precision inside the narrow case. It is necessary to do so. On the other hand, in the present invention, the seal case 71 is fitted in the part where the first shaft protrudes from the main clutch housing 3, and the first shaft is connected to the rear end wall 3a and the seal case 71.
The hydraulic clutch type device can be attached to the shaft in a cantilevered state to form an assembly, and the assembly can be easily performed by inserting the assembled state into the transmission case 2. It can be done.

Second, in the technology described in Japanese Utility Model Application Publication No. 52-42978, support plates for the first and second shafts, called oil passage plates and center plates, are placed between the main clutch housing 3 and the transmission case 2. However, in the present invention, the support plate is formed as a rear end wall 3a that is integrally formed with the main clutch housing 3, so the number of parts can be reduced, and the assembly time can be reduced compared to the conventional method. In the above, there was the trouble of assembling the hydraulic clutch device and the support plate at the same time, but this problem has been solved.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a tractor equipped with a hydraulic clutch type transmission, Figure 2 is a transmission line diagram of the hydraulic clutch type transmission, Figure 3 is a side longitudinal sectional view of the housing case, and Figure 4 is a PTO transmission. FIG. 3 is a detailed diagram of device D. 1... Engine, 2... Mission case, 2
c...Wall portion, 3...Main clutch housing, 3a
... Rear end wall, 13 ... Rear axle housing,
19...first axis, 26a, 26b, 27a, 27
b...Hydraulic clutch, 71...Seal case.

Claims (1)

[Scope of utility model registration request] The main clutch housing 3 is located on the rear of the engine 1.
Mission case 2/Rear axle housing 1
In a configuration in which the hydraulic clutch type transmission A is housed in the transmission case 2, the rear end of the main clutch housing 3 is connected to the front end of the transmission case 2. A rear end wall 3a is integrally erected on the clutch housing 3, and an opening is formed at the front end of the transmission case 2 in which the hydraulic clutch type transmission A can be installed. 2c, both ends of the first shaft supporting the hydraulic clutch type transmission are supported by bearings between the rear end wall 3a and the wall portion 2c, and the front end of the first shaft 19 is connected to the rear end wall 3a of the main clutch housing 3. The first shaft 19 protrudes further forward and connects with the main clutch shaft 16, and the first shaft 19 is connected to the rear end wall 3a.
A hydraulic system characterized in that a seal case 71 that inherits the oil passage on the case side and the oil passage on the first shaft side is fitted in the more protruding part, and the seal case 71 is attached to the front surface of the rear end wall 3a. Clutch type transmission.