JPS6139664Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting mechanism for an engine frame in a mobile machine. For more details,
This invention relates to an engine frame mounting mechanism that prevents high-frequency engine vibrations (chatter vibrations) from propagating to the hands of the driver who holds the steering wheel.

In mobile machines such as rice transplanters, the engine frame on which the engine is mounted is generally fixed to a transmission case. Therefore, depending on how the engine frame is fixed to the transmission case, chatter vibrations from the engine can be transmitted to the hands of the driver who holds the steering wheel, which can cause occupational diseases such as white wax disease. be. In order to eliminate such problems, conventionally the engine frame was attached to the transmission case by rubber mounting via anti-vibration rubber. However, anti-vibration rubber is very expensive and therefore disadvantageous in terms of cost, and also has the drawback of complicating the engine support mechanism.

In addition, since anti-vibration rubber has a large amount of deflection under load, in side-pulling belt-driven devices, load fluctuations can cause the engine to twist, causing the belt to become misaligned and come off the pulley. There were also things to do.

The purpose of this invention is to solve the above-mentioned conventional problems, to prevent the chatter vibration of the engine from propagating to the handle even though it has an extremely simple structure, and to apply it to a horizontal pull type belt drive. Another object of the present invention is to provide a mounting mechanism for an engine frame in a mobile machine that prevents the belt from coming off.

The engine frame mounting mechanism of the mobile machine of the present invention that achieves the above object is such that the engine frame on which the engine is mounted is mounted to the transmission case, and there is a small gap between the mounting part of the engine frame and the mounting part of the transmission case. Tighten and fix with bolts through a collar that forms a
The engine frame and transmission case are loosely connected.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Figure 1 is an overall side view of a walk-behind rice transplanter in which the engine frame is fixed to the transmission case of the machine body using the mounting mechanism of the present invention. This is the engine frame to which it is mounted and fixed. This engine frame 2 is attached to the front part of a transmission case 3 of the fuselage body, as will be described in detail later.
4 is a running wheel, and 5 is a handle provided at the rear.

Figure 2 shows the front part of the rice transplanter mentioned above.
FIG. 3 is a detailed view of the fixing portion between the engine frame 2 and the transmission case 3. FIG. Engine frame 2 is the third
As shown in detail in the figure, the engine 1 is fastened to the upper surface of the engine frame 2 with bolts 6. On the other hand, the engine frame 2 has mounting parts 2a and 2c for the transmission case 3 on both sides and the center of the rear part thereof, respectively, and boss parts 2b and 2d are fixed to the mounting parts 2a and 2c by welding, respectively. ing. As shown in FIG. 4, the left and right mounting parts 2a, 2a have boss parts 3a formed on the front part of the transmission case 3, which is divided into left and right halves, between them.
3a, and insert the bolt 7 so as to pass through the boss portion 2b on the engine frame 2 side and the boss portion 3a on the transmission case 3 side.
Furthermore, a collar 8 and a washer 9 are interposed at both ends thereof, and are integrally tightened and fixed by a nut 10 screwed onto the tip of the bolt 7. Here, the collar 8 is slightly longer than the boss portion 2b on the engine frame 2 side, and one end surface of the collar 8 is brought into contact with the side surface of the boss portion 3a of the transmission case 3, and the other end surface is brought into contact with the side surface of the boss portion 3a of the transmission case 3. By bringing it into contact with the washer 9, a small gap l is formed between the boss portion 3a and the washer 9. Further, the outer diameter of the collar 8 is made slightly smaller than the inner diameter of the boss portion 2b of the engine frame 2, so that a small gap s is formed between the two.

The bolt 7 serves as a means for fixing the engine frame 2 to the transmission case 3 as described above, and also serves as a tightening bolt for integrally tightening the left and right transmission cases 3, which have a split structure. It's becoming like that.

On the other hand, the mounting part 2 at the center of the engine frame 2
c is brought into contact with the front part of the transmission case 3 as shown in FIG. It is tightened and fixed by screwing the bolt 11 into the female thread on the transmission case 3 side. Also in this case, the length of the collar 8 is made slightly larger than the thickness of the boss portion 2d of the engine frame 2, and as a result, a small gap 1 is formed between the collar 8 and the washer 9. Further, similarly to the above, the outer diameter of the collar 8 is made slightly smaller than the inner diameter of the boss portion 2d, so that a gap s is formed between the two.

Therefore, according to the mounting mechanism described above, the engine frame 2 is loosely coupled to the transmission case 3, and the high frequency vibrations generated in the engine 1 are damped at this loosely coupled portion, and the engine frame 2 is loosely coupled to the transmission case 3. It will not be propagated to subsequent members. In order to make such damping more effective, as a result of various experiments, it is preferable that the sizes of the gaps l and s be about 0.1 to 0.5 mm. In particular, the gap l is set to about 0.5 mm, the gap s is set to about 0.1 to 0.3 mm, and l
A relationship of >s is even more preferable.

Furthermore, the above mounting mechanism does not mount using anti-vibration rubber like in the past.
The structure is simple and compact, and it does not cause large flexures like anti-vibration rubber, so even if the drive system of the mobile device is a horizontal pull type belt drive, it will not cause twisting of the engine base or lateral slippage. Therefore, it is possible to eliminate the phenomenon of the belt coming off the pulley due to load fluctuations.

FIG. 6 shows a fixing mechanism according to another embodiment of the present invention. In this embodiment, a thin spacer rubber 12 is interposed between the washer 9 and the boss portion 2b in which the gap l was formed in the above embodiment. In this embodiment as well, the same effects as in the above embodiment can be obtained. However, the thickness of the spacer rubber must not be too large.

Although the embodiment described above is applied to a walking rice transplanter, the present invention can also be applied to other similar mobile machines. It is particularly suitable for application to mobile agricultural machinery.

As described above, the engine frame mounting mechanism for a mobile aircraft according to the present invention is such that the engine frame on which the engine is mounted is mounted on the transmission case, and a small gap is formed between the mounting portion of the engine frame and the mounting portion of the transmission case. Tighten and fix with bolts through a collar that forms a
Since the engine frame and transmission case are loosely connected, high-frequency vibrations from the engine can be damped with a simple structure of inserting a metal collar, without using expensive anti-vibration rubber like in the past. It is possible to prevent the vibration from being transmitted to the members after the transmission case, and it is also possible to eliminate the complexity of the mechanism that is required when using conventional vibration isolating rubber. In addition, since the amount of flexure is not as large as with anti-vibration rubber, there is little twisting of the engine base even when applied to a horizontal pull type belt drive system, which prevents the belt pulley from coming off due to load fluctuations as in the past. This phenomenon does not occur.

[Brief explanation of the drawing]

Figure 1 is a side view of a walk-behind rice transplanter to which the engine frame attachment mechanism of the present invention is applied, Figure 2 is an enlarged side view of the engine frame attachment mechanism of the same rice transplanter, and Figure 3 is a perspective view of the engine frame. 4 is a cross-sectional view of FIG. 2, FIG. 5 is a cross-sectional view of FIG. 2, and FIG. 6 is a cross-sectional view of a mounting portion according to another embodiment. 1...Engine, 2...Engine frame, 3
...Mission case, 7, 11...Bolt, 8
...Color, 9...Washiya, 10...Natsuto.

Claims (1)

[Scope of utility model registration request] The engine frame on which the engine is mounted is fixed to the transmission case by tightening bolts with a collar that forms a small gap between the mounting part of the engine frame and the mounting part of the transmission case. A mounting mechanism for an engine frame in a mobile machine, characterized in that the engine frame and the transmission case are loosely connected.