JP2582959B2 - Work vehicle transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission mainly suitable for a mid-mower lawn mower in which a transmission having a frictionless continuously variable transmission mechanism is laterally offset. The present invention is also applicable to tractors and trucks.

[0002]

2. Description of the Related Art Lawn mowers increasingly employ a friction-type continuously variable transmission as an inexpensive means for continuously variable transmission. In a conventional midmore lawn mower, for example, as shown in Japanese Utility Model Application Laid-Open No. 2-123827, mowing turf cut with a mower is collected in a rear grass container via a duct passing through the lateral outside of the body. Configuration.

[0003]

However, in order to eliminate the disadvantage of running due to the overhang of the duct, such as poor passage in a narrow place or high possibility of contact with other objects, the center of the space between the left and right rear wheels is reduced. It has been attempted to displace the duct rearward through the underfloor space of the fuselage by laterally biasing the mission case lying in the section. SUMMARY OF THE INVENTION An object of the present invention is to configure a transmission device suitable for intentionally biasing a transmission including a friction type continuously variable transmission in the left and right direction, in which it is more convenient to arrange the drive unit in the left and right central portions as much as possible. It is in the point to let.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a transmission case in which a rear axle is rotatably mounted with a frictionless continuously variable transmission, and the transmission case is biased to one of the right and left sides of the body. A support for supporting the rear axle located on the other side with respect to the body is formed in a case shape surrounding the rear axle, and the one end of the support is provided. The internal space of the transmission case and the internal space of the support body are connected and connected to each other so as to communicate with each other.

[0005]

When the transmission is deflected in the left-right direction, the rear axle lengths are not the same in the left and right directions. Therefore, it is necessary to support the longer rear axle separately from the transmission at a position near the rear wheel. Therefore, according to the present invention, the supporting body for supporting the shaft is formed in a case shape surrounding the rear axle, and the supporting body is connected and connected to the transmission case in a state where the insides communicate with each other. In other words, the lubricating oil in the transmission case also reaches the support, so that the lubricating oil can be sufficiently supplied to the axle support of the rear axle provided at the tip of the support, thereby enabling the lubricating oil to dissipate heat. It is possible to increase the heat radiation portion. This is advantageous for a transmission including a frictionless continuously variable transmission which is disadvantageous in terms of heat as compared with a gear type or the like because the cooling effect of the lubricating oil is improved as compared with the conventional transmission.

[0006]

Therefore, the transmission case can be improved by adopting a rearward axle supporting structure which is necessary in order to adopt a mission in which the duct is installed under the floor of the fuselage to improve the running performance and has an advantage in that the rearward axle is used. A rational transmission suitable for an internal transmission of a frictionless continuously variable transmission that can enhance the cooling effect of the lubricating oil in the vehicle can be provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 6 shows a mid-mower mower as an example of a work vehicle, wherein 1 is a front wheel, 2 is a rear wheel, 3 is a driver's seat, 4 is an engine, M is a mission, and 6 is a mower. As shown in FIGS. 1 to 4, the transmission M includes a friction type continuously variable transmission (hereinafter abbreviated as CVT) 7, a forward / reverse rotation mechanism 8, and a differential mechanism 9.
Are arranged inside the transmission case 5 and FIG.
As shown in the figure, the switching shaft 10 of the forward / reverse rotation mechanism 8 is connected to the differential mechanism 9
Is disposed above the rear axle 11, which is the output shaft of
The CV is located at a position in front of the switching shaft 10 and above the rear axle 11.
As a result, the transmission case 5 has an L-shaped side view shape that is forward and upside down, and the rear end of the housing 13 of the mower 6 is located in the lower front space S. They are positioned relative to each other. An input shaft 16 having an input pulley 15 which is belt-linked with an output pulley (not shown) of the vertical engine 4 is provided in an up-and-down shaft shape, and is decelerated by one step before being fitted to the main shaft 12 so as to be relatively rotatable. The bevel gear is transmitted to the input gear 17. The differential mechanism 9 includes left and right rear axles 11 and 11 as output shafts, and a differential case 19 is linked with the switching shaft 10 in a chain operation.

[0010] As shown in FIG. 5, the mission M is arranged to be offset to the left side of the fuselage, and the right rear axle 11 is
Is rotatably supported by a shaft support A provided near the center. As shown in FIG. 1, the shaft support A is provided at the right end of a cylindrical case-like support 20 surrounding the right rear axle 11, and the left end of the support 20 is attached to a rear axle take-out portion of the transmission case M. The internal space K of the transmission case and the support 20
And the internal space Q is connected and connected to each other so that the lubricating oil in the transmission case M is supplied to the shaft support A in the support 20. The right rear axle 11 is sufficiently supported by the body by bolting the bracket 18 fixed to the support body 20 at the portion of the shaft support A to the body.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a mission.

FIG. 2 is a cross-sectional view showing the structure of the mission, continued from FIG.

FIG. 3 is a diagram showing the entire structure of the mission.

FIG. 4 is a side view of a mission unit.

FIG. 5 is a rear view of the lower part of the lawn mower.

FIG. 6 is an overall side view of the lawn mower.

[Explanation of symbols]

 Reference Signs List 5 transmission case 7 frictionless continuously variable transmission 11 rear axle 20 support

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryuzo Nakamura 64, Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works

Claims (1)

(57) [Claims] A transmission case (5) for supporting a rear axle (11) is provided with a frictionless continuously variable transmission (7), and the transmission case (5) is shifted to one of the right and left sides of the body. And the rear axle (1
A support (20) for supporting 1) with respect to the body,
Forming and providing a case surrounding the rear axle (11);
And a work vehicle having the one end of the support (20) connected to the transmission case (5) in a state where the internal space of the support and the internal space of the support (20) communicate with each other. Gearing.