JP3198414B2 - Side clutch / brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transmission device for an agricultural traveling vehicle body such as a tractor or a mobile agricultural machine.

[Conventional technology and its problems]

Many agricultural traveling vehicles have a four-wheel drive configuration for traveling on a soft field, and a configuration in which a working device is connected to a rear portion to advance the work while moving forward. In such an agricultural traveling vehicle body, the work apparatus is connected to increase the weight on the rear side of the vehicle body, while the weight on the front side of the vehicle body is configured to be increased by using the vehicle body constituent members. In addition, the weight balance of the entire body is improved while reducing the weight of the body.

Therefore, conventionally, as shown in Japanese Utility Model Application Laid-Open No. 61-134218, a branch transmission unit to the left and right front wheels is provided in a transmission case which is provided with a branch transmission unit to the left and right front wheels and is disposed at the front of the vehicle body. , The weight of the front side of the vehicle body is configured to be heavy, and the left and right front axles that transmit to the left and right front wheels extend outward from the left and right sides of the transmission case to the left and right. In some configurations, the transmission case is used as a support component for the front wheels to reduce the weight of the machine body.

Moreover, in the above-described vehicle, the transmission case is provided with a branch transmission portion to the left and right rear wheels, so that the left and right rear wheel take-out shafts that transmit to the left and right rear wheels extend rearward from inside the transmission case. Although it comes out, the branch transmission to the left and right rear wheels is arranged forward of the left and right front axle, and the left and right rear wheel take-out shafts are arranged to extend from the front of the front axle to the rear. Has become. As a result, the transmission case can be arranged further forward, while the front axle extends left and right outward from both left and right sides of the transmission case. The overall front-to-back weight balance can be improved.

However, in the above-mentioned vehicle, the left and right rear wheel take-out shafts are arranged below the front axle. For this reason, the transmission case swells downward, and there is a problem that the clearance with the ground below the transmission case is reduced accordingly. Therefore, an object of the present invention is to solve this problem.

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention provides a four-wheel drive agricultural traveling vehicle body having front and rear wheels on the left and right and connecting a working device 68 on the rear, and a branch transmission unit to the left and right front wheels and a left and right The transmission case 7 is provided with a branch transmission unit for the rear wheels, and the left and right front axles 11 for transmitting to the left and right front wheels are extended outward from the left and right sides of the transmission case 7 to the left and right. The left and right rear wheel take-out shafts 32 that transmit to the rear wheels extend rearward from inside the transmission case 7, and the branch transmissions to the left and right rear wheels are arranged forward of the left and right front axles 11. The rear wheel take-out shaft 32 is disposed above the front axle 11 so as to extend from the front to the rear of the front axle 11 to provide a transmission for an agricultural traveling vehicle body.

[Functions and Effects of the Invention]

Since the present invention is configured as described above, the transmission case 7 is arranged as close to the front as possible while using the transmission case 7 as a support component for the front wheels, while reducing the weight of the body. It is possible to improve the front-to-back weight balance of the entire body, and furthermore, in the transmission case 7, the left and right rear wheel take-out shafts 32 extend rearward from the front of the front axle 11 at a position above the front axle 11. With such an arrangement, the downward swelling of the transmission case 7 is reduced, so that the clearance between the transmission case 7 and the ground below the transmission case can be increased.

[Embodiment] A transmission device for a tractor as one embodiment of the present invention,
This will be described below.

The transmission case 7 shown in FIG.
And a right and left split type that is joined from both right and left sides, and the joining edge of the left case L7 and the right case R7 is tightened and fixed with bolts. The tractor is configured in a four-wheel drive configuration. A front wheel differential device 13 serving as a branch transmission unit to the left and right front wheels is provided at the center of the left and right front axle housings 12 that house left and right front axles 11 that transmit to the left and right front wheels.
The transmission case is formed by integrally molding a front wheel differential device case portion 14 that accommodates the front wheel differential device 13 and is located between the left and right front axle housings 12 and a front transmission case portion 15 thereof. 7. Therefore, the left and right front axles transmitted to the left and right front wheels
The transmission case 11 is extended outward from the left and right sides of the transmission case 7 to the left and right, and the transmission case 7 is used as a support component for the front wheels.

In front of the front axle 11, belts 16,1
An input shaft 18 which is transmitted by the transmission gear 7 and a center shaft 22 which is geared and meshed by a transmission gear 19 on the input shaft 18 and has a center gear 22 at the center where the clutch shaft 4 serves as a branch transmission to the left and right rear wheels. A pair of left and right rear wheel counter shafts 25 each having a counter gear 24 always meshed with a gear 23 integral with the side clutch 1 on the clutch shaft 4 and a front wheel differential gear constantly meshed with a center gear 22 on the clutch shaft 4. Ring gear 26 of device 13
A front wheel counter shaft 28 having a counter gear 27 that meshes with
A gear 20 meshed with the transmission gear 29 on the input shaft 18 and a power take-out shaft 21 having a back gear 30 and the like are mounted on the shaft. Therefore, a front wheel differential device 13 serving as a branch transmission unit to the left and right front wheels is provided, and the left and right front axles 11 that transmit to the left and right front wheels as described above are moved outward from the left and right sides of the transmission case 7. Transmission case 7 extended toward
Inside, a clutch shaft 4 serving as a branch transmission to the left and right rear wheels
And the front side of the vehicle is made heavier.

Also, from the left and right ends of the rear wheel counter shaft 25, via a bevel gear 31, the rear wheels interlocking with the rear axles of the left and right rear wheels via the left and right outer portions of the differential case portion 14 above the front axle housing 12. The take-out shafts 32 are provided on the left and right. Accordingly, the left and right front axles 11 transmitting to the left and right front wheels extend outward from the left and right sides of the transmission case 7 to the left and right while transmitting the right and left rear wheels to the left and right rear wheels. The wheel take-out shaft 32 is configured to extend rearward from inside the transmission case 7. And, as described above, the clutch shaft 4 serving as a branch transmission portion to the left and right rear wheels.
Are arranged on the front side of the left and right front axles 11, and the left and right rear wheel take-out shafts 32 are arranged so as to extend from the front of the front axle 11 to the rear above the front axle 11, and The bulge is reduced.

In addition, a connection shaft 34 mounted on a power take-out case 33 attached to the outside of the left case L7 is fitted to the distal end portion of the power take-out shaft 21, and a rearward operation is performed via a gear 35, a beveler 36, and the like. A transmission shaft 37 is provided, and the work transmission shaft 37 is linked to a working device 68 such as a seedling planting device that connects the work transmission shaft 37 to the rear end of the vehicle body. 38 is a drive shaft mounted on the rear end of the right case R7,
Pulley 3 transmitted by belt 70 from pulley 69 of engine 64
A pulley 41 is provided between the input shaft 18 and the pulley 40 of the input shaft 18 for passing belts 16 and 17 capable of sub-speed change.

A center gear is provided on the clutch shaft 4 by springs 78 at both ends.
A clutch body integrally including a side clutch 1, a gear 23, a side brake 2 having a conical brake shoe 3 and the like to be tensioned toward the side 22 is provided slidably in the axial direction.
It is configured to be operated by the shifter 42. A brake surface 6 is formed on the cone brake 5 in which the bearings 43 bearing both ends of the clutch shaft 4 are fitted, and the rotation of the clutch body is braked by the frictional force between the brake shoe 3 and the brake surface. Outside the cone brake 5, the clutch shaft 4
Protruding short-shaped detent projection 9 so as to pass through the axis of
Inside of transmission case 7, ie, left case L7 and right case
A depressed portion is formed inside R7 so as to be fitted with the cone brake 5, and a detent for fitting the detent projection 9 on the center of the clutch shaft 4 at the center of the depressed portion. Recess 8
Is formed. The engagement between the locking projection 9 and the locking recess 8 keeps the rotation of the cone brake 5 with respect to the transmission case 7 locked and disabled. This cone brake 5
An opening 44 for opening the fitting portion 45 of the bearing 43 is formed on the long-change side of the detent projection 9.

 46 is a shift shifter stay, and 47 is a differential lock mechanism.

48 is a steering shaft hole formed in the vertical direction at the front end of the left case L7.
The lower end of the steering shaft 51 is bearing. Reference numeral 49 denotes a steering shaft hole formed vertically in the lower portion of the left case L7. The steering shaft hole 49 is interlocked with a steering shaft hole 49 via a pinion mechanism provided in the transmission case 7 from the lower end of the steering shaft 51. By bearing the pitman arm shaft that is used, a steering interlocking configuration can be achieved.

By the rotation of the input shaft 18, the center gear 22 is transmitted directly from the transmission gear 19 or via the back gear 30, and the side clutch 1 is engaged with the center gear 22,
The gear 23 transmits the counter gear 24 of the rear wheel counter shaft 25, and transmits the rear wheel take-out shaft 32. The rear wheels are driven and rotated from the rear wheel take-out shaft 32.

In addition, the differential gear 13 and the front axle 11 are transmitted from the center gear 22 on the clutch shaft 4 via a counter gear 27, a ring gear 26, and the like to drive the front wheels.

A work transmission shaft 37 for transmitting the work device is connected to a coupling shaft 3 of a power take-out case 33 attached to the outside of the transmission case 7 from the transmission gear 29 on the input shaft 18 via the gear 20 and the power take-out shaft 21.
4, transmitted via gear 35, bevel gear 36 and the like.

Therefore, as described above, and as shown in the drawings, the transmission of the tractor is a four-wheel drive agricultural traveling vehicle body having front and rear wheels on the left and right and connecting the working device 68 to the rear. The transmission case 7 is provided with a branch transmission unit for the left and right front wheels and a branch transmission unit for the left and right rear wheels, and the left and right front axles 11 for transmitting the left and right front wheels are disposed on both left and right sides of the transmission case 7. Left and right rear wheel take-out shafts that extend outward from the left and right and are transmitted to the left and right rear wheels
32 extends rearward from the inside of the transmission case 7, the branch transmissions to the left and right rear wheels are arranged on the front side of the left and right front axles 11, and the left and right rear wheel take-out shafts 32 are connected to the front axle 11. Since the transmission case 7 is arranged so as to extend from the front to the rear of the front axle 11 at the upper position, the transmission case 7 is arranged as close to the front as possible while using the transmission case 7 as a supporting component for the front wheels. In addition, the weight of the fuselage can be reduced while improving the front-rear weight balance of the entire fuselage. In addition, the right and left rear wheel take-out shafts 32 are located in the transmission case 7 and the front axle 11 is positioned above the front axle 11. 11 is arranged so as to extend from the front to the rear, so that the downward swelling of the transmission case 7 is reduced, and therefore, the clearance between the transmission case 7 and the ground below the transmission case is lower than before. Can be increased.

[Brief description of the drawings]

Each drawing is briefly described below. FIG. 1 is a cross-sectional plan view showing the inside of a transmission case in a developed manner. FIG. 2 is a cross-sectional plan view showing a left case and a right case of the transmission case in a developed manner. FIG. 3: Inside view of the left case of the transmission case. FIG. 4: Inside view of the right case of the transmission case. FIG. 5: Front view of the cone brake. FIG. 6: Cross-sectional side view of the cone brake. FIG. 7: Cross-sectional side view of the cone brake. Main symbols in the figure will be briefly described below. 7: Transmission case 11: Front axle 32: Rear wheel take-out shaft

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor, Hisashi Kamiya 1-Yakura, Tobe-cho, Iyo-gun, Ehime Pref. (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 17/22 B60K 17/348 B62D 11/08 F16D 67/02

Claims (1)

(57) [Claims] 1. A four-wheel drive agricultural traveling vehicle body having front and rear wheels on the left and right and a working device 68 connected to the rear, a branch transmission for left and right front wheels and a branch transmission for left and right rear wheels. The left and right front axles 11 that transmit to the left and right front wheels extend outward from the left and right sides of the transmission case 7 to the left and right, and the right and left front wheels that transmit to the right and left rear wheels are provided. The rear wheel take-out shaft 32 is connected to the transmission case 7
Extending rearward from inside, the branch transmission to the left and right rear wheels is arranged forward of the left and right front axles 11, and the left and right rear wheel take-out shafts 32 are positioned above the front axle 11 A transmission for an agricultural traveling vehicle body, which is arranged so as to extend from the front to the rear of the vehicle.