JP2500641Y2 - Engine integrated drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to an engine-integrated traveling drive mechanism mounted on a steering vehicle.

(B) Conventional Technology Conventionally, it is well known that the mission case for installing the engine is a vertically divided two-part case. For example, it is like the technique described in JP-A-62-234725.

(C) Problems to be solved by the invention However, in the prior art, in the case of the vertically split two-part case, the widths of both cases are made equal, and the engine is arranged so as to straddle the upper surfaces of both cases. Since E is mounted, when the heights of both cases are different due to the machining error of the cases, the two cases, which are less rigid than the engine, are relatively deformed, and the input shaft, axle, etc. There was a possibility that the shaft would be deformed or that the parallelism of the shaft center would not be obtained, and in the worst case, the mission case might be damaged.

Further, since mounting brackets made of sheet metal are provided in various places such as the engine and the mission case, a vibration system is newly added, which is disadvantageous to vibration and noise. There was also the problem that it was difficult to attach it to the machine frame.

The problems of the prior art of the present invention are solved.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

In a configuration in which one end of the input shaft 3 which is parallel to the axles 5L and 5R is projected from the mission case M and is linked to the output shaft 21 of the engine E through a belt speed change mechanism, the mission case M is connected to the input shaft 3. It is a right-angled two-divided case, the upper surface of one of the half-divided cases 1 is formed wide to form an engine installation surface 1c, and the other half-divided case 2 is a lid,
Mounting brackets 1a are mounted on the machine frame at the four corners of the upper surface of the half cases 1 and 2.

(E) Embodiment The problems to be solved and the means for solving the present invention are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a rear cross-sectional view of an engine-integrated traveling drive mechanism of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view of a mission case M, and FIG. A side view, FIG. 5 is a rear cross-sectional view of the speed change pulley portion on the output shaft 21 of the engine E, FIG. 6 is a side cross-sectional view of the centrifugal clutch C part, and FIG. 7 is a speed change pulley part of the input shaft 3. FIG. 8 is a rear cross-sectional view showing another embodiment of the portion shown in FIG.

In FIG. 1, the overall structure of the engine-integrated traveling drive mechanism will be described.

The mission case M is disposed below, the upper surface of the mission case M is configured as an engine installation surface 1c, and the engine E is mounted and fixed on the engine installation surface 1c.

The output shaft 21 of the engine E is projected into the belt shift case 29, and the rotation after continuously changing the speed in the belt shift case 29 is transmitted from the input shaft 3 into the transmission case M.

After shifting forward and backward inside the mission case M,
It is configured to drive wheels by axles 5L and 5R.

As shown in FIG. 3, the mission case M is constructed by joining the left and right half-split cases 1 and 2 with a vertical joining surface to form one.
The case is individual. And one half case 1 is made thick, and the engine installation surface 1c is configured on the upper surface.
The engine E can be placed only on the engine installation surface 1c. The other half case 2 is made thin as a lid for covering the opening of the half case 1, and the engine E is not mounted on the half case 2.

As a result, the engine E is supported only by the engine installation surface 1c on the half case 1.

In addition, as shown in FIG.
Mounting brackets 1a and 1b are integrally projected at the corners, and mounting brackets 2a are provided at the two corners above the half case 1.
・ 2b is projected. The anti-vibration rubbers 35, 36 are placed on the lower surface of the mounting brackets 1a, and the anti-vibration rubbers 35, 36 are placed on the machine body frame F of the traveling vehicle.

And the engine installation surface 1c on the mission case M
A centrifugal clutch C is provided on the output shaft 21 of the engine E mounted on the drive side split pulley 7a of the belt transmission mechanism.
7b, a governor weight 6 and a cooling fan 10 are arranged.

Further, the driven side split pulleys 8a and 8b are arranged on the input shaft 3 arranged below the belt transmission case 29.

The centrifugal clutch C interposed between the output shaft 21 and the drive side split pulleys 7a and 7b is disclosed in FIGS.

That is, the boss portion 22 is fixed to the output shaft 21, and the flange plate 23 is fixed to the outer periphery of the boss portion 22 by bolts. The brake shoe 15 is pivotally supported by the pivot plate 16 on the flange plate 23, and when the rotation speed of the output shaft 21 is increased, the brake shoe 15 rotates outwardly about the pivot shaft 16, The part of the brake friction plate 17 contacts the inner circumference of the brake case 7e, which is formed integrally with the drive side split pulley 7a, and the output shaft 21 and the brake case 7e are integrated.

The flange plate 23 is provided on the inner side of the brake case 7e,
16 and the brake shoe 15 are pivotally supported, and the flange plate 23
On the surface of the engine E side of, the return spring 18 of the brake shoe 15
Is arranged. The driven side split pulleys 8a and 8b are engaged with a spring fixing bolt 19 on the side of the brake shoe 15 and a spring bracket 20 provided on the engine E side of the flange plate 23.

An end portion of a boss portion 22 integrally fixed to the output shaft 21 is projected to the left and configured as a mounting shaft of the cooling fan 10.

A bearing is provided on the outer periphery of the boss portion 22, and a drive side split pulley is provided.
7a is loosely fitted. A drive side split pulley 7b is slidably and non-rotatably interposed via a slide key 38 on the outer periphery of the drive side split pulley 7a.

Both of the drive side split pulleys 7a and 7b slide in the opposite direction by the rotation of the governor weight 6 to change the pulley diameter of the drive side split pulleys 7a and 7b around which the belt 11 is wound. .

A cam contact disk 7d is fixed to the boss portion of the drive side split pulley 7b, and a cam contact disk 7c is also bolted to the end of the boss portion of the drive side split pulley 7a.

The cam abutment portion of the governor weight 6 is fitted between the cam abutment disk 7d and the cam abutment disk 7c, and the governor weight 6 increases the rotational speed to allow the camber of the governor weight 6 to move. The abutment portion rotates to open between the cam abutment disk 7d and the cam abutment disk 7c and narrow the drive side split pulleys 7a and 7b to form a large diameter pulley.

Therefore, the centrifugal clutch C is turned on and the drive side split pulley 7
When the rotation starts, the governor weight 6 controls the drive-side split pulleys 7a and 7b in the large-diameter direction.
The number of rotations of will be faster.

7 and 8 are drawings showing the structure of the driven side split pulleys 8a and 8b, in which the pressing spring 12 supported by the spring receiver 13 constantly narrows the space between the driven side split pulleys 8a and 8b. do it,
Although it is biased toward the small diameter pulley, the governor weight 6 is rotated by the rotation of the drive side split pulleys 7a and 7b as described above, and the drive side split pulleys 7a and 7b are changed to the large diameter pulley. In this case, the belt 11 pushes open the space between the driven side split pulleys 8a and 8b against the pressing spring 12, and the rotation speed of the input shaft 3 is increased.

When the centrifugal clutch C is disengaged and the drive-side split pulley 7 stops rotating, the diameter of the drive-side split pulley 7 is reduced, so that the belt 11 is loosened and the diameter of the driven-side split pulley 8 is increased.

Reference numeral 14 is a long bolt that connects the spring receiver 13 and the driven-side split pulley 8a.

In FIG. 1, the mission case M from the input shaft 3
The gears 30 and 31 are engraved on the input shaft 3 by being input into the inside of the
And forward rotation is transmitted.

Further, the gear 31 on the input shaft 3 meshes with the reverse gear 26 on the shifter shaft 32, and the reverse gear 26 meshes with the gear 24 on the counter shaft 4 to transmit the reverse rotation.

Either the forward gear 25 or the reverse gear 24 is used as a shift shifter.
33 is selected and power is transmitted from the gear 27 to the ring gear 28 of the differential gear device D. Axles 5L and 5R project from the differential gear device D to the left and right.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

Firstly, it was possible to improve the overall rigidity of the engine-integrated traveling drive mechanism.

Second, the engine installation surface 1c on the upper surface of one half case
Since the transmission case M itself has a low rigidity, the engine is installed on one half case side, so that relative deformation does not occur and the input shaft and the axle are not deformed. Of.

Thirdly, since the mounting bracket 1a of the machine body frame is integrally molded with the mission case M, the bracket can be molded at the same time when the half case is molded.

Therefore, the processing cost is low, and it is no longer necessary to bolt the mounting bracket 1a to the engine E or the like as in the conventional case.

Fourthly, since the engine-integrated traveling drive mechanism of the present invention can be assembled from the upper side of the machine chassis, it can be assembled by attaching it to the machine frame via a vibration-proof rubber on its mounting bracket, so assembly is easy. It will be.

[Brief description of drawings]

FIG. 1 is a rear cross-sectional view of an engine-integrated traveling drive mechanism of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a perspective view of a mission case M, and FIG. A side view, FIG. 5 is a rear cross-sectional view of the speed change pulley portion on the output shaft 21 of the engine E, FIG. 6 is a side cross-sectional view of the centrifugal clutch C part, and FIG. 7 is a speed change pulley part of the input shaft 3. FIG. 8 is a rear cross-sectional view showing another embodiment of the portion shown in FIG. E …… Engine C …… Centrifugal clutch 1,2 …… Half case 1a, 1b, 2a, 2b …… Mounting bracket 1c …… Engine installation surface 3 …… Input shaft 5L, 5R …… Axle

Claims (1)

(57) [Scope of utility model registration request] 1. In a structure in which one end of an input shaft 3 which is parallel to the axles 5L and 5R is projected from the mission case M and is linked to an output shaft 21 of an engine E through a belt speed change mechanism, the mission case M is input to the input shaft 3. A half-divided case that is perpendicular to the shaft 3 is formed. The upper surface of one half-divided case 1 is widened to serve as an engine installation surface 1c, and the other half-divided case 2 serves as a lid. An engine-integrated traveling drive mechanism characterized in that mounting brackets 1a, ... to the body frame are formed at the four corners of the upper surface of the.