JPH07149158A - Transmission case for tractor - Google Patents

Abstract

PURPOSE:To provide transmission gears of various specifications at a low cost by using the clutch housing and transmission case of a tractor in common, and providing a spacer case and a sub-case to be fitted at the front end section of the transmission case. CONSTITUTION:The front end section of a gear shift shaft 3 in a transmission case 1 is extended to the inside of a clutch housing 2 in front of the transmission case 1, a spacer case and a sub-case 5 removably fitted to the front end face of the transmission case 1 are supported on a bearing 6, and the bearing 6 is hooked by a stop ring 8 from an opening section opened at the extension section of the transmission shaft 3 of the spacer case and the sub-case 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor mission case, and a subcase of various specifications is attached to a clutch housing and a mission case by utilizing a space portion of a clutch housing in front of the mission case. -It is intended to share the space.

[0002]

2. Description of the Related Art In the case where a space case, a sub-case, etc. are attached to the front side of a standard mission case to form transmissions of various different specifications, the mission is A C-shaped retaining ring is simply attached to the front end of the transmission shaft in the case between the space case and the sub-case.

[0003]

According to the present invention, the front end portion of a transmission shaft 3 in the transmission case 1 is extended inside the clutch housing 2 in the front portion of the transmission case 1 so as to extend the transmission case. Spare that can be detachably attached to the front end surface of 1.
The bearing 4 is borne by the case 4 to the sub-case 5, and the bearing bearing 6 is locked by a stop ring 8 from an opening 7 opened in the extension of the transmission shaft 3 of the space case 4 to the sub-case 5. The structure of the mission case of the tractor is provided as much as possible.

[0004]

[Operation and effect of the invention] Space case 4 and subcase
In order to mount the shoe 5 and the like on the front side of the mission case 1, since the space in the clutch housing 2 is used, the clutch housing 2 and the mission case 1 are commonly used, and various specifications can be provided. The transmission can be manufactured at low cost. In this case, an opening 7 is formed in the extension of the transmission shaft 3 such as the space case 4 and the sub case 5, and the stop ring 8 is formed from the opening 7. Since it can be attached and detached, the operation is simple, and the construction is simple because it is based on the opening 7 and the extension of the transmission shaft 3.

[0005]

EXAMPLE A clutch housing 2 of a tractor is connected to the rear side of an engine body, a front mission case 1 is connected to the rear side of the clutch housing 2, and a rear mission case 9 is further connected to the rear side. Be connected. The front wheels are steerably provided on both left and right ends of a front axle housing supported by a front axle bracket located in the front part of the engine body, and the rear wheels are rear axles integrated on both left and right sides of the rear mission case 9. They are provided on the outer side of the housing, and are respectively driven via transmission devices in the mission case.

In the front transmission case 1, a pinion gear shaft 11 having a pinion gear 10 at its rear end, a transmission shaft 3, a front wheel transmission shaft 12, and a counter shaft 13 are arranged. The front parts of the shafts 3, 11, 12, 13 and the like are borne by the spacer 4 or the sub case 5 and the rear part by the rear mission case 9, and the front mission case 1 itself. Do not directly bearing.

As shown in FIG. 1, the standard transmission has a sub-case 5 directly attached to the front side of the front transmission 1. The sub-case 5 has an input shaft coaxial with the pinion gear shaft 11. 14 is borne by bearings 15 and 16, the transmission shaft 3 is a PTO transmission shaft, the front end portion is borne by the bearing 6, and the front end portion of the front wheel transmission shaft 12 is borne by the bearing 18.

The input shaft 14 is connected to a transmission shaft 19 which is driven through a main clutch in the clutch housing 2 by a coupling 20 and has a gear 21 at a rear end thereof, and a front end of the pinion gear shaft 11 is provided at this shaft portion. The portion is supported by a needle bearing 22. A front end portion 23 of the PTO transmission shaft 3 extends forward of the bearing 6 and projects into an opening formed in the sub case 5, and a C-shaped stop ring 8 is inserted into the opening 7. , PTO transmission shaft 3
It is fitted in a ring groove formed around the front end 23. Two
A cap 4 covers the front end of the opening 7.

The front end of the front wheel transmission shaft 12 is provided with a front wheel take-out shaft 25 which is interlocked with the differential device of the front axle housing.
They are connected by a coupling 26. 27 is a shaft cover. The pinion gear 10 at the rear end of the pinion gear shaft 11 meshes with the bevel gear 28 of the differential device in the rear transmission case 9 to transmit the left and right rear wheels. The rear portion of the PTO transmission shaft 3 is interlocked with the rear PTO shaft via the rear transmission gear 1 through the transmission gears, and is interlocked with the working machine connected to the rear portion of the tractor body or the like.

In the mission case 1, each shaft 1
A main transmission 29 and an auxiliary transmission 30 for traveling transmission are provided between 1, 3, 12, and 13. On the pinion gear shaft 11, a gear shaft 34 having gears 31, 32, 33 is rotatable, an auxiliary transmission gear 35 is axially movable, and a gear shaft 38 having gears 36, 37 is rotatable. Further, gears 39 are respectively provided as integral rotations, and the auxiliary transmission gears 3
By the movement of 5, the gear shafts 34 and 38 are engaged with each other, and the transmission to the pinion gear shaft 11 is switched.

Further, on one side of the front transmission case 1, a gear case 43 rotatably supporting a gear shaft 42 having gears 40, 41 is attached by being inserted from the outside. The auxiliary transmission gear 35 and the gear 36 are set to have a meshable relationship. The sub-transmission gear 35 has a relationship in which it can mesh with the gear 41 at a position where it does not mesh with the front and rear gear shafts 34, 38.

A gear 44 that meshes with the gear 21 of the input shaft 14 is integrated on the PTO transmission shaft 3, and a first speed gear 46 and a back gear 47 that are meshed with a main speed clutch 45 are made rotatable, and a main speed shift is performed. A second speed gear 49 and a gear shaft 50 that are engaged by the clutch 48 are rotatably provided. The first speed gear 46 includes the gear 31 and a back gear 47.
Is a counter gear 51 rotatable with respect to the counter shaft 13, a second speed gear 49 is a gear 32, a gear 52 on the gear shaft 50 is a gear 33, a gear 53 is a gear 37, and
The gear 54 rotatable with respect to the gear shaft 50 is a gear 39.
Are always meshed with each other.

In this way, in the main transmission 29, the main transmission clutch 45 is engaged with the first speed gear 46 side to transmit the gear shaft 34 to the first speed, and the main transmission clutch 45 is engaged with the back gear 47 side. At the same time, the transmission of the counter gear 51, the gear 32 and the like is transmitted to the back by switching transmission, and the main transmission clutch 58 is engaged with the second speed gear 49 to transmit to the second speed and the main transmission clutch 58 is transmitted to the third speed. High speed gear 52
The transmission of the third speed is performed by engaging with.

Further, in the sub transmission 30, the sub transmission gear 35
Is geared to the gear shaft 34 side to be a gear shift H, gear gear 38 is geared to a low speed L, and gear 41 is geared to a super-low speed LL. Being transmitted. To engage with the front wheel transmission shaft 12, the clutch gear 55 is connected to the intermediate gear 5 on the gear shaft 50.
It is possible to drive four-wheel drive by engaging with four and transmitting the output.

The sub case 5 is attached to the front end of the front transmission case 1 by means of a bolt inside the clutch housing 2. The specifications in FIG. 2 are such that the front wheel four-wheel drive can be accelerated and the front wheel is driven to almost double speed during turning to facilitate steering. Therefore, between the front wheel transmission shaft 12 and the shaft 25,
The wet friction multi-plate type switching clutches 56 and 57 are provided, and the piston 59 and the spring 60 by the hydraulic pressure in the cup link 58 are provided.
By switching the switching clutch 56 or 57 on and off, the switching clutch 56 and 57 are turned on and off by switching from the gear 61 integrated with the front wheel transmission shaft 12 to the switching clutch 56, 57.
The front wheel take-out shaft 25 is transmitted at a constant speed to the front wheel transmission shaft 12 via the cup link 58, the shaft 25 and the like. Also, the switching clutch 5
When 7 is turned on, the switching clutch 56 is off,
The front wheel transmission shaft 12 includes a gear 61, a counter gear shaft, a gear 62, a switching clutch 57, and a coupling 5.
The gears 61 and 6 are interlocked with the front wheel take-out shaft 25 through 8 or the like.
Depending on the ratio with 2, the speed is increased to about twice.

The sub-case 5 having the switching clutches 56, 57 and the like therein is tightened together with bolts with a space case 4 having a predetermined thickness interposed on the front end surface of the transmission case 1. To install. The bearing 16 of the input shaft 14 is supported by the space case 4, and the bearing 6 at the front portion of the PTO transmission shaft 3 and the bearing 18 bearing the gear 61 at the front end portion of the front wheel transmission shaft 12 are also provided. Support the space case 4.

In the sub case 5, the input shaft 14 is supported by the bearing 15 and the front wheel take-out shaft 25 is supported by the bearing 63. Further, the PTO transmission shaft 3 is set to have a long dimension of the shaft end 23 so that it can be seen through the opening 7 of the sub-case 5 and the collar 64 can be fitted to the outer peripheral surface of the shaft end 23. Then, the front end is locked by the stop ring 8.

In the specifications shown in FIG. 3, the PTO transmission shaft 12
Coupling the front PTO shaft 65 to the front end of the
The sub-case 5 has an opening 7
The bearing 67 is supported by a bearing 67, and the bearing 67 is locked to the front PTO shaft by a stop ring 8.
68 is a seal. In addition, without the back gear 47, the gears 44 and 46, the main transmission clutch 45, the gear 49,
The main transmission clutch 48 and the like are provided on a cylindrical shaft 69 that rotates integrally with the PTO transmission shaft 12.

In the specifications shown in FIG. 4, a full-time four-wheel WD 70 is provided between the front wheel transmission shaft 12 and the front wheel take-out shaft 25 inside the space case 4 and the sub case 5. The gear 71 on the front wheel transmission shaft 12 is constantly meshed with the gear 54. 5 and 6, the mid PTO shaft 7 is shown.
6, the PTO gear case 72 is attached to the lower side or the lateral side of the mission case 1 or 9 and the drive gear 73 is inserted into the mission case 1 or 9 from this attachment port. When the PT is engaged with a gear at a proper position on the PTO transmission shaft 3, for example, the gear 44,
The configuration is such that the O-axis 76 can output and rotate. The transmission of the take-out of the mid PTO shaft 76 is performed by the movement of the clutch gear 74 that is spline-fitted on the PTO shaft 76.
It is performed by meshing with the drive gear 73.

The operating mechanism for operating the clutch gear 74 is a shifter shaft 75 rotatably fitted to the side surface of the PTO gear case 72, and a shifter arm 77 integrally attached to the inner end of the shifter shaft 75. And the shifter pin 78 at the tip,
An attachment plate 79 for attaching the shifter shaft 75, a clip pin 81 for positioning the shifter pin 78 by pressing a clip ball 81 into a clip hole 80 of the arm 77 with a spring 82, and an outer side of the shifter shaft 75. To the arm pin 8 with a spring pin 84 and an arm pin 85.
Operation shaft cylinder 86 rotated by an operation mechanism connected to
When the operation shaft cylinder 86 is rotated, the shifter pin 78 is rotated around the shifter shaft 75, and the clutch gear 74 in which the shifter pin 78 is fitted in the pin groove 87 is moved to drive the drive gear 73. The PTO clutch is engaged and disengaged by engaging and disengaging with.

The shifter shaft 75 and the shifter arm 77 are integrally formed, and the shifter shaft 75 is inserted from the inside of the PTO gear case 72 into the shaft hole and mounted. Further, with the shifter pin 78 engaged with the pin groove 87 of the clutch gear 74, the clip pin 83 is inserted into the pin hole from the outside, and the clip ball 81 at the tip end is clipped on the shifter arm 77. The hole 80 is opposed to the turning position. The clip hole 80 of this shifter arm 77 is
It is set at two positions corresponding to the clutch engagement position and the clutch disengagement position of the movement.

When the shifter shaft 75 and the clip pin 83 are mounted on the PTO gear case 72 in this manner, the mounting plate 79 is superposed from the outside of these and the bolts 110 are tightened and fixed to the case 72. . At this time, a shaft hole facing the shifter shaft 75 is formed in the mounting plate 79, and the shaft hole is fitted to the shifter shaft 75 to the outside of the shifter shaft 75 and the clip pin 83. Do not slip out. The shaft cylinder 86 is fitted to the outer end of the shifter shaft 75 from the outside of the mounting plate 79, and is stopped by the spring pin 84. 88 is an o-ring for the shifter shaft 75, 8
Reference numeral 9 is an o-ring of the clip pin 83. 90 is PT
It is a mounting bolt for the O gear case 72 to the mission case. Reference numeral 91 is a detachable cap that covers the PTO shaft 76.

In FIG. 7, a hydraulic continuously variable transmission HS is provided in the clutch housing 92 in place of a part of the transmission.
T is provided, and forward and backward shifts are interlocked with the petals 94 and 95 that petal-operate the speed change shaft 93 of the hydraulic continuously variable transmission HST, but the rotation of the neutral cam 97 fixed to the petal shaft 96 of the petals 94 and 95. The arm 99 of the roller 98 that locks the movement at the neutral position is engaged by the lock lever 100 to fix the petals 94 and 95 at the neutral position.

The petals 94 and 95 are provided in front of and behind the petal shaft 96, and can step forward on the petal 94 and step forward on the petal 95. A rod 1 which can be freely expanded and contracted between the petal 94 and the arm 101 of the transmission shaft 93.
It is connected with 02. The neutral cam 97 integrally includes the petals 94, 95 and the like, and the roller 98 of the roller arm 99 is pressed by the spring 103 at the center of the V-shaped inclined cam surface, so that the petals 94, 95 are separated from each other. It is provided so that it can always return to the neutral position. Reference numeral 104 is a pivotal shaft of the roller arm 99 with respect to the clutch housing 92, and 105 is a pin at the tip of the roller arm 99.

A lock lever is provided on the clutch housing 92.
100 is provided so as to be swingable around a pivot shaft 106, and a hook 107 at the lower end thereof is engaged with a pin 105 of the roller arm 99, whereby a neutral position of the roller 98 is obtained. This lock lever -1 can be locked when operating the petals 94 or 95 to shift gears.
00 of the hook 107 from the pin 105, the spring 10
3, the roller 98 is pressed, that is, the new
This is performed after the trawl cam 97 is allowed to rotate. At this time, the lock lever 100 locks the release position of the neutral lock by the stopper 108.

[Brief description of drawings]

FIG. 1 is a transmission mechanism diagram.

FIG. 2 is a transmission mechanism diagram showing another embodiment.

FIG. 3 is a transmission mechanism diagram showing another embodiment.

FIG. 4 is a transmission mechanism diagram showing another embodiment.

FIG. 5 is a side view of a PTO gear case portion.

FIG. 6 is a front view thereof.

FIG. 7 is a side view of a shift operation device portion according to another invention.

[Explanation of symbols]

 1 mission case 2 clutch housing 3 speed change shaft 4 spacer case 5 sub case 6 bearing bearing 7 opening 8 stop ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Koyama, 1 No. 1 Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture

Claims (1)

[Claims] 1. A front end portion of a transmission shaft 3 in the transmission case 1 is extended inside a clutch housing 2 in the front portion of the transmission case 1 so as to be attachable to and detachable from a front end surface of the transmission case 1. Space case 4 to sub case 5 to attach
A transmission of a tractor which is connected to a bearing ring 6 and can be locked by a stop ring 8 from an opening 7 which is opened in an extension of the transmission shaft 3 of the space case 4 to the sub-case 5. Case.