JP2979617B2 - Clutch housing structure - Google Patents

Description

The present invention relates to a structure of a clutch housing of an agricultural tractor or the like.

[Prior Art] In an agricultural tractor, a reduction gear case is attached to a rear portion of a clutch housing case accommodating a clutch, and an output shaft of the reduction gear case and an input shaft on a transmission case side provided at a rear portion of the machine body are universally connected. The applicant has filed an application linked and connected by a joint. In such a transmission, oil must be injected to lubricate the gear mechanism in the reduction gear case.
Therefore, an oil supply hole is provided on the upper surface of the case, and a drain hole for discharging the oil is provided on the lower surface.

[Problems to be Solved by the Invention] By the way, in recent tractors, when a specification change is required, a method is adopted in which most of the components are shared and only some of the components are replaced.

For example, in the case of the tractor as described above, the transmission in the transmission case may be used as it is, and the gears in the reduction gear case may be changed, or another transmission unit may be attached in place of the reduction gear case. is there.

However, in such a device, it is necessary to provide an oil supply hole, a drain hole, and the like for each transmission case and unit having different types and sizes. This was cumbersome and increased costs.

[Means for Solving the Problems] The present invention has been proposed in view of the above problems, and has taken the following technical means.

That is, a case 25 accommodating a transmission mechanism 28 is detachably connected to a rear portion of the clutch housing 3 accommodating the clutch 6, and an output shaft 32 projecting rearward from the case 25 is provided.
And an input shaft 42 extending forward from the transmission case 4 behind the transmission case 4 via an appropriate power transmission tool 43. The upper rear portion of the clutch housing 3 is communicated with the case 25. An oil supply hole 20 is provided, and an oil detection hole 21 communicating with the inside of the case 25 is provided at the rear center of the housing 3.
Further, a drain housing 22 for draining oil communicating with the inside of the case 25 is provided in a lower rear portion of the housing 3 to provide a clutch housing structure.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the structure will be described. Reference numeral 1 denotes a tractor, which is provided with an engine 2 at the front of the fuselage.
The clutch body 3 is connected to a rear portion of the vehicle, and a saddle-shaped spacer case 5 behind the clutch housing 3 for connecting the clutch housing 3 and the transmission case 4 constitutes an airframe.

In the clutch housing 3, a dry single-plate main clutch 6 is provided. As shown in FIG. 5, a shifter yoke 10 is mounted on a support shaft 8 suspended in the clutch housing 3, and the shifter yoke 10 is moved in the front-rear direction. , The cylindrical sleeve 11 moves on the clutch shaft 12 and the clutch 6 is disconnected.

As shown in FIGS. 2 and 3, the support shaft 8 of the clutch 6 protrudes forward from a boss 13 fixed horizontally outward from an outer wall of the clutch housing 3 and a rear wall 14 of the clutch housing 3. A clutch arm 18 is rotatably supported between the boss 15 and a clutch arm 18 connected to the clutch pedal 16 at the outer end of the support shaft 8.

In the case of the conventional device, the boss 15 is fixed to the outer wall of the clutch housing 3. However, in this embodiment, since the boss 15 is provided on the wall 14, the length of the support shaft 8 can be shortened, so that machining members can be saved. In addition, since the depth of the processing hole for inserting the support shaft does not increase, the hole forming operation is easy.

A first communication hole 20 communicating from the top to the rear is formed in an upper portion of the rear wall 14 of the clutch housing 3, and a second communication hole 21 communicating with a horizontal space is formed in a lateral side portion.
A third communication hole 22 communicating with the lower space is formed in the bottom.

Reference numeral 25 denotes a concave metal case connected to the rear surface of the clutch housing 3. A closed chamber 26 is formed by the metal case 25 and the wall 14 of the clutch housing 3.
Inside, various transmission mechanisms are provided.

The first communication hole 20 serves as an oil supply hole for injecting oil into the chamber 26, and the second communication hole 21 flows out of the room when the supplied oil reaches a certain level, and the specified amount of oil flows out. The third communication hole 22 is configured to function as a drain hole for draining oil, and is configured to function as a window that allows confirmation of filling.

In this embodiment, a synchromesh type forward / reverse transmission 28 is provided in a metal case 25.

That is, the small-diameter gear 33b formed at the end of the clutch shaft 12 meshes with the large-diameter gear 33a of the two-stage gear 33 loosely fitted on the transmission shaft 32.
It always meshes with the counter gear 36 integrated with the counter shaft 35. Counter gear at the rear of the counter shaft 35
37 is a transmission shaft through a back idle gear (not shown).
When the front gear train is selected by operating the shifter by constantly meshing with the gear 40 on the gear 32, the transmission shaft 32 is given forward (forward) rotation, and conversely, when the shifter is moved backward, the reverse rotation is performed. The rotation power in the (reverse) direction is taken out.

The transmission shaft 32 extends rearward as it is, and is interlocked with an input shaft 42 of the transmission case 4 via a coupling 43. The rotation of the transmission shaft 32 is appropriately shifted by a transmission A accommodated in the transmission case 4, and The power is transmitted to the wheel transmission system and the front wheel transmission system.

Here, the structure of the transmission A will be briefly described. The transmission A is composed of a main transmission section B and an auxiliary transmission section C, and the main transmission section B can perform three speed shifts of high speed, medium speed and low speed. The sub-transmission C can perform high-speed and low-speed two-speed shifting. Both the main and auxiliary transmissions are provided between the drive pinion 44 and the PTO drive shaft 45.

Reference numeral 46 denotes an input gear formed at a shaft end of the input shaft 42, and a front end of the drive pinion 44 is loosely fitted into a hole of the input gear 46. Reference numeral 50 denotes a three-stage gear including a large-diameter gear 50a, a medium-diameter gear 50c, and a small-diameter gear 50c, which is rotatably fitted to the drive pinion 44, and has a claw 50d formed at a rear end of the small-diameter gear 50c. I have. Reference numeral 51 denotes a boss at the rear portion of the three-stage gear 50, which is spline-fitted to the drive pinion 44. A sliding gear 52 is fitted to the boss 51 so as to be able to move back and forth.

A two-stage gear 54 composed of a small-diameter gear 54a and a large-diameter gear 54b is loosely fitted to the drive pinion 44 at the rear thereof. 54c is a claw provided on the small diameter gear 54a.

On the other hand, a boss 57 is loosely fitted to the front of the PTO drive shaft 45,
A gear 58 is fixed to the front end, and this gear 58 is an input gear.
It is configured to always mesh with 46. A gear 59 is loosely fitted on the boss 57, which is a rear portion of the gear 58, and a claw portion 59a formed at the rear end of the gear 59 is engaged with the internal teeth of the first shifter member 61 fitted to be able to rotate integrally with the boss 57. It is configured to mesh. That is, when the first shifter member 61 is moved to the front side and the internal teeth and the claw portions 59a mesh, the rotation of the boss 57 is
The speed is transmitted to the large-diameter gear 50a of the third-stage gear 50 via the "9", and "low speed" is selected. A gear 62 is loosely fitted to the rear portion of the boss 57. The gear 62 is always meshed with the medium-diameter gear 50b of the three-stage gear 50, and a claw portion 62a is formed at an end thereof. 64
Is a second shifter member that slides in the front-rear direction on a spline boss 65 fitted to the rear end of the boss 57.

A cylindrical two-stage gear 68 is loosely fitted on the PTO drive shaft 45 behind the spline boss 65, and a large-diameter gear on the front side is provided.
68a always meshes with the small diameter gear 50c of the three-stage gear 50. 2
A claw portion 68c is formed at the front of the large-diameter gear 68a of the step gear 68,
When the second shifter member 64 meshes with the claw portion 62a of the gear 62,
The rotation of the boss 57 is transmitted to the medium-diameter gear 50b via the gear 62, where "medium speed" is selected. When the second shifter member 64 is moved rearward and meshes with the claw portion 68c of the second gear 68, the rotation of the boss 57 rotates via the large gear 68a of the second gear 68 and the small gear 50c of the third gear 50. , Where "high speed" is selected.

A small-diameter gear 68b provided at the rear of the two-stage gear 68 meshes with a gear 54b on the drive pinion 44. Reference numeral 70 denotes a gear spline-fitted to the final portion of the drive pinion 44, and reference numeral 71 denotes a counter gear which always meshes with the gear 70 and is fixed to the two-stage gear 68.

The operation of the auxiliary transmission C will be briefly described. The sliding gear 52 is moved to the front side so that the claw portion 50d of the three-stage gear 50 and the boss 5 are moved.
When the first gear 1 is connected, the "high speed" of the auxiliary transmission C is obtained.
When the boss 51 is connected to the boss 51, "low speed" is obtained.

Further, the front wheel power take-out gear 73, which is spline-fitted on the front wheel drive shaft 72 and is configured to be slidable back and forth, meshes with the counter gear 71 to transmit power to the front wheel drive shaft 72.

Although a detailed description is omitted, in the middle of the power transmission system of the front wheel drive shaft 72, the peripheral speed of the front wheels becomes higher than the peripheral speed of the rear wheels even in conjunction with the turning operation of the steering handle 75. The front wheel speed-up mechanism 80 is provided.

81 is a constant velocity clutch when the peripheral speeds of the front wheels 2 and 2 and the rear wheels 3 and 3 are substantially equal.
This is a speed increasing clutch that works when the peripheral speed is increased beyond the peripheral speed.
82 are connected so as to be connected.

In this embodiment, the transmission 28 for forward / reverse rotation is incorporated in the metal case 25. However, it is possible to incorporate various transmissions in place of this device. Since the hole communicating with the case 25 side is formed in advance, it is not necessary to form a plurality of holes for different types of metal cases, and the labor for hole processing can be saved.

In addition, the spacer case 5 side covering the periphery thereof does not require a hole forming operation such as providing a hole at a position corresponding to the communication hole of each metal case, so that it is possible to save not only the processing work but also the mounting. Work is also easier.

In this embodiment, the outer periphery of the metal case 25 is covered with the saddle-shaped spacer case 5 and the spacer case 5 is directly fixed to the transmission case 4. On the case 4 side, the present invention may be applied to a so-called frame type tractor having no spacer case fixed to a frame. In that case, the upper part of the metal case 25 may be directly covered with the floor of the tractor 1.

[Effects of the Invention] Since the present invention is configured as described above, the oil supply hole 20, the oil inspection hole 21, or the drain hole is provided on the case 25 side which is connected to the rear portion of the clutch housing 3 and accommodates various transmission mechanisms 28. twenty two
It is not necessary to provide the same, the labor for processing the various cases 25 can be saved, the manufacturing cost can be reduced, and the strength is not reduced by opening the holes on the case 25 side.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a side view of a tractor, FIG. 2 is a side sectional view of a transmission, FIG. 3 is an enlarged sectional view of a main part, FIG. FIG. 5 is a front view,
FIG. 6 is a side view. DESCRIPTION OF SYMBOLS 1 ... Tractor 3 ... Clutch housing 4 ... Mission case 6 ... Main clutch 20 ... First communication hole 21 ... Second communication hole 22 ... Third communication hole 25 ... Metal case

Continuation of the front page (56) References Japanese Utility Model Sho 61-25225 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 17/00-17/36 F16H 57/02

Claims (1)

(57) [Claims] 1. A case 25 accommodating a transmission mechanism 28 is detachably connected to a rear portion of the clutch housing 3 accommodating the clutch 6, and an output shaft 32 protruding rearward from the case 25 is provided. An input shaft 42 projecting forward from one of the transmission cases 4 is interlocked and transmitted by an appropriate power transmission tool 43. An oil supply hole 20 communicating with the inside of the case 25 is provided at an upper rear portion of the clutch housing 3. In the middle of the rear part of the housing 3, an oil detecting hole 21 communicating with the case 25 is provided.
And a drain hole 22 for discharging oil communicating with the inside of the case 25 at a lower rear portion of the housing 3.