JPH052048Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a transmission housing that is connected to the rear of the cutting blade housing and projects upwardly from the upper surface of the cutting blade housing. and a front opening space, in which a traveling transmission case is inserted and disposed, and an upper wall portion that covers the upper opening of the transmission housing and a front wall that covers the front opening of the transmission housing. The present invention relates to a cover mounting structure for a walk-behind lawn mower, in which a cover including a portion is detachably attached to the cutting blade housing and the transmission housing.

[Conventional technology]

Such walk-behind lawn mowers are designed so that the transmission system, such as the traveling transmission case inside the transmission housing, can be easily inspected by removing the cover.

In the cover mounting structure of this type of walk-behind lawn mower, conventionally, for example, as shown in FIG.
A bolt 13 is provided for detachably attaching the lower end of the front wall portion 11B of the cover 11 to the upper surface of the corresponding cutting blade housing 1, and the upper wall portion 11A of the cover 11 is attached to the upper surface of the corresponding transmission housing 7. A pair of insertion portions 17, 17 which are removably inserted into and held in the upper portion 7A are attached to the upper wall portion 11.
I have prepared it for A. When attaching the cover 11, the lower end of the front wall portion 11B of the cover 11 is fixed to the upper surface of the cutting blade housing 1 by tightening the bolts 13, and a pair of Insert part 17,1
7 into the upper portion 7A of the transmission housing 7, the rear end portion of the upper wall portion 11A is inserted into the transmission housing 7 and held therein.

[Problem that the invention attempts to solve]

However, in the conventional cover mounting structure, the upper wall portion 11A is simply attached to the upper portion 7A from the front.
In other words, as shown in FIG. 7, since the bolt 13 is inserted and held in the direction along the mounting surface, the cover 11 is damaged by vibrations of the aircraft and heat from sunlight.
In some cases, the insertion portion 17 could move significantly forward and come off from the upper portion 7A when the deformation and the like overlap.

If it comes off, the oscillating cover 11 and the transmission housing 7 will frequently come into contact with each other, causing noise and deformation or damage to the cover 11, which is not preferable. In particular, when the cover 11 is made of a relatively soft material such as synthetic resin, the above-mentioned disadvantage is likely to be noticeable.

The purpose of the present invention is to devise a way to reliably prevent the cover from coming off.

[Means for solving problems]

In order to achieve the above object, the present invention provides a fixture for removably attaching the lower end of the front wall part and the upper surface of the cutting blade housing, and the rear end of the upper wall part and the upper part of the transmission housing. A fitting portion is formed in the opposing portion of the transmission housing to be fitted into and removed from the transmission housing in the longitudinal direction. In order to restrict relative movement in the vertical and longitudinal directions, the fitting direction of the fitting portion is formed along a plane that is inclined with respect to a horizontal plane in the longitudinal direction.

[Effect]

According to the above characteristic structure, the lower end of the front wall portion of the cover and the upper surface of the cutting blade housing can be firmly attached relative to each other using the fixing tool. The rear end portion of the upper wall portion of the cover and the upper portion of the transmission housing are in a fitted state because the fitting directions of the fitting portions formed on both sides are inclined with respect to the horizontal plane. In this case, relative movement between the upper wall portion and the upper portion in both vertical and longitudinal directions is regulated by one fitting structure. This is clearly advantageous compared to the conventional system, in which the relative movement regulating effect between the cover and the transmission housing is exerted almost only in the vertical direction, and the mating parts do not come out of each other even if there is some vibration or thermal deformation of the machine. You can eliminate the need to put things away.

[Effect of idea]

As a result, the problem of the cover easily coming off due to a slight impact will be eliminated, and the problem of noise generation, cover deformation, and damage caused by the cover coming off will be eliminated by setting the mating part to be tilted back and forth. This could be achieved with simple modification.

〔Example〕

FIG. 5 shows a walk-behind lawn mower, which includes a cutting blade housing 1 that also serves as the body frame.
A rotary cutting blade 2 that can freely rotate around a vertical axis is housed, and a pair of left and right front and rear wheels 3, 4 are provided on the front and rear sides of the cutting blade housing 1, respectively, and a pair of front and rear wheels 3, 4 for running are provided on the front and rear sides of the cutting blade housing 1, respectively. An engine E for driving the rotary cutting blade 2 and rear wheels 4 is provided in the blade housing 1, and a storage container 5 for storing the grass cut by the rotary cutting blade 2 is disposed on the rear side of the cutting blade housing 1. The handle 6 is configured to extend rearward from the cutting blade housing 1.

As shown in FIGS. 1 to 4, a transmission housing 7 is integrally formed at the rear of the cutting blade housing 1 and projects upwardly from the upper surface of the cutting blade housing 1. A space that opens forward is formed, and a traveling transmission case 8 is inserted into and arranged in this space, and an upper wall portion 11A that covers an upper opening 9 of the transmission housing 7 and a front opening of the transmission housing 7 are formed. 10
A resin cover 11 having a front wall portion 11B that covers the cutting blade housing 1 and the transmission housing 7 is detachably attached to the cutting blade housing 1 and the transmission housing 7.
By removing 1, it is possible to easily inspect the traveling transmission case 8, the transmission shaft 12 from the engine E to the traveling transmission case 8, etc. through the upper opening 9 and the front opening 10. .

To explain the mounting structure of the cover 11, the cover 11 is installed to cover the upper part of the transmission shaft 12.
11C of cover parts connected to the front wall part 11B of
The lower end of the cutting blade housing 1 corresponding to the lower end of the cutting blade housing 1 is
The cover portion 11C is provided with a bolt 13 as a fixture for detachably attaching it to the upper surface 1A, and the bolt 13 is inserted into the upper surface 1A of the cutting blade housing 1 corresponding to the lower right end of the front wall portion 11B. An insertion portion 14 is formed to restrict the back and forth movement with respect to the cutting blade housing 1, and an insertion portion 14 is formed on the opposing surface between the rear end portion of the upper wall portion 11A of the cover 11 and the corresponding upper portion 7A of the transmission housing 7. , relatively fitting portions 15 and 16 that restrict the relative movement of these both in the vertical direction and the front-back direction, and removable fitting portions 15 and 16 are formed separately. When the cover 11 is attached to the transmission housing 7, the relative fitting direction by the fitting portions 15 and 16 is moved forward and downward so that the relative movement of both the fitting parts 11 and 7 in the vertical and front-back directions is restricted. It is set in a tilted state.

Therefore, in order to attach the cover 11, first insert the fitting part 15 of the cover 11 into the fitting part 16 of the transmission housing 7, and insert the insertion part 14 into the cutting blade housing 1, and then insert the bolt 13 into the cutting blade housing 1.
This is completed by fixing the cover portion 11C to the cutting blade housing 1 using the following steps. This mounting structure allows
The cover 11 can be reliably attached to the transmission housing 7.

[Another example]

In the embodiment, the fitting parts 15 and 16 were formed integrally with the rear end of the upper wall part 11A of the cover 11 and the upper part 7A of the transmission housing 7, but the fitting parts 15 and 16 were formed separately. 16 may be attached to the rear end of the upper wall portion 11A and the upper portion 7A of the transmission housing 7, respectively.

Further, in the embodiment described above, the cover portion 11C that covers the transmission shaft 12 is connected to the front wall portion 11B of the cover 11, but the cover portion 11C and the cover 11 may be formed separately and attached separately. You can.

Further, in the embodiment described above, the front wall portion 11B is provided with the insertion portion 14, but it may be omitted.

Further, in the embodiment described above, the transmission housing 7 is formed integrally with the cutting blade housing 1, but it may be formed separately.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the cover mounting structure for a walk-behind lawn mower according to the present invention, FIG. 1 is a perspective view showing the cover mounting part, FIG. 2 is a longitudinal side view showing the cover mounting part, and FIG. 3 is a perspective view showing the cover mounting part. A and B are a plan view of the rear part of the walk-behind lawn mower, FIG. 4 is a front view of the cover, and FIG. 5 is an overall side view of the walk-behind lawn mower. 6 and 7 show a conventional example. FIG. 6 is an exploded perspective view showing a cover mounting structure, and FIG. 7 is a cross-sectional side view of a main part showing a cover mounting state. 1...Cutter blade housing, 1A...Top surface, 7...
Transmission housing, 7A... upper part, 8... traveling transmission case, 9... upper opening, 10...
...Front opening, 11...Cover, 11A...Top wall portion, 11B...Front wall portion, 13...Fixing tool, 1
5, 16...Mating part.

Claims (1)

[Scope of utility model registration request] A transmission housing 7 that protrudes above the upper surface of the cutting blade housing 1 is connected to the rear of the cutting blade housing 1, and a space that opens upward and forward is formed in the transmission housing 7. A cover 11 into which the traveling transmission case 8 is inserted and provided with an upper wall portion 11A that covers the upper opening 9 of the transmission housing 7 and a front wall portion 11B that covers the front opening 10 of the transmission housing 7. A cover mounting structure for a walk-behind lawn mower, which is detachably attached to the cutting blade housing 1 and the transmission housing 7, wherein the front wall portion 11
A fixture 13 for removably attaching the lower end portion of the upper wall portion 11A to the upper surface of the cutting blade housing 1 is provided at a portion facing the rear end portion of the upper wall portion 11A and the upper portion 7A of the transmission housing 7 in the front-rear direction. Mating parts 1 that are mated to and separated from each other by insertion and removal in the direction along
5 and 16, and the fitting portion 15 is designed to restrict relative movement between the cover 11 and the transmission housing 7 in the vertical and longitudinal directions when the cover 11 is attached to the transmission housing 7. , 16, the fitting direction of the cover is formed along a surface that is inclined with respect to the horizontal plane in the front-rear direction.