JP2594639Y2 - Idler pulley mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idler pulley mounting structure, and more particularly to a technology for reducing product cost by simplifying a pulley mounting structure and reducing the number of components.

[0002]

2. Description of the Related Art Conventionally, as a mounting structure of an idler pulley, Japanese Unexamined Utility Model Publication No.
Japanese Patent Application Laid-Open No. 97256/1997 discloses such a device. FIG. 2 shows an example of such an idler pulley mounting structure. That is, in the figure, a bracket 2 is fixed to a cylinder block 1 of an engine by bolts 3 and a bolt 4 is inserted through a hole 2a formed on the back surface of the bracket 2 to A support member 5 is inserted into contact with the surface of the bracket 2, and a bearing 7 is formed by an end of the support member 5 and a nut 6 screwed from the tip of a bolt 4.
And the pulley body 8 is rotatably mounted via the bearing 7.

The support member 5 is provided with a flange 5a extending to a position near the outer case 7a of the bearing 7.
The function a provides a dust sealing function on the engine end surface side of the bearing 7. The bearing 7 includes a spacer 9 and a retaining ring 1.
The dust seal member 11 is fixed in the pulley main body 8 and the dust seal of the bearing 7 on the side opposite to the engine is performed by a dust seal member 11.

[0004]

In order to mount such an idler pulley on the engine body, a support member 5 having a bracket 2 and a flange 5a is required. In this case, the bracket 2 and the support member 5 must be fixed by the bolts 3 and 4, respectively, and there is a problem that the number of assembling steps increases and the product cost increases.

In view of the foregoing, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an idler pulley mounting structure in which the mounting cost is reduced by simplifying the mounting structure and reducing the number of components. With the goal.

[0006]

[Means for Solving the Problems] For this reason, the present invention is, d
A support that protrudes from the outer wall surface of the engine body into a substantially columnar shape on the engine body.
Part is integrally molded, and a shaft support is attached to the tip of the support ,
A nut is screwed in from one end of the shaft support , and a bearing is sandwiched and fixed between the support and the nut. A pulley body is rotatably mounted via the bearing, and The inner dust seal also serves as the front end surface of the support portion .

[0007]

According to this configuration, the shaft support of the idler pulley is provided.
Is attached to the tip of the support part integrally molded with the engine body.
This eliminates the need for conventional mounting brackets and spacers, and also fixes the bearing between the support and the nut.
When the pulley body is rotatably mounted via the bearing
In both cases, attach the dust seal inside the bearing to the tip of the support
With a configuration that also serves as a surface, the number of dust seal members can be reduced.

As described above, the mounting structure is simplified, the number of components is reduced, and the product cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 showing an embodiment of the present invention, a support portion 21a is provided on a side surface of a cylinder block 21 of an engine body. A stud 23 is mounted as a shaft supporting portion for freely supporting the shaft.
Male threads are threaded at both ends of the stud 23, one end is a free end, and the other end is screwed and fixed to a female thread 21b threaded to the support 21a.

The tip surface 21c of the support portion 21a contacts the side surface of the inner case 24a of the bearing 24,
The upper end of the distal end surface 21c is extended to a position near the outer case 24b to perform a dust sealing function of the bearing 24. The bearing 24 includes an inner case 24a, an outer case 24b, and a ball bearing 24c. The inner case 24a of the bearing 24 is formed by a nut 25 screwed from a free end of a stud 23 and a distal end surface 21c of the support portion 21a. The outer case 24b is clamped and fixed, and the outer case 24b is clamped and fixed in the idler pulley 22 by a contact surface 22a of the idler pulley 22 and a retaining ring 27 via a spacer 26. It is rotatably supported by the stud 23 through the shaft.

The nut 25 is provided with a flange 25a extending to a position near the outer case 24b of the bearing 24, and the flange 25a has a dust sealing function on the bearing 24 opposite to the engine. In addition, this collar 25
a is a nut 25 as a dust seal member as in the prior art.
Alternatively, it may be provided separately.

According to the idler pulley mounting structure having such a configuration, the stud 23 as a shaft support of the idler pulley 22 is directly mounted on the support 21a of the cylinder block 21 of the engine body, which has conventionally been required for mounting. Brackets and support members are not required. Furthermore,
The inner case 24a of the bearing 24 is sandwiched and fixed between the distal end surface 21c of the support portion 21a of the cylinder block 21 and the nut 25, and the bearing 24 is fixed by the distal end surface 21c of the support portion 21a.
By also using the dust seal on the engine body side, the number of dust seal members can be reduced. Thus, the mounting structure is simplified, the number of components is reduced, and the cost of the product can be reduced.

In the above embodiment, the upper end of the front end surface 21c of the support portion 21a and the flange portion 25a of the nut 25 are extended to a position near the outer case 24b of the bearing 24 as having a dust sealing function. However, it is not always necessary to completely close the gap, and it is sufficient that the gap is extended to a position that substantially closes the gap.

[0014]

[Effects of the Invention] As described above, according to the present invention,
The idler pulley shaft support is directly integrated with the engine body.
Since it is configured to be attached to a support portion which forms, conventional mounting bracket will not be required, the engine body supported
The bearing between the sandwiching member and the nut to fixedly hold, the inner bearing da
Whether the strike seal is also used as the tip of the support section
Therefore , the number of dust seal members can be reduced, so that the mounting structure can be simplified, the number of components can be reduced, and the product cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an attachment structure of an idler pulley according to the present invention.

FIG. 2 is a sectional view showing a conventional idler pulley mounting structure.

[Description of Signs] 21 Cylinder block 21a Support portion 21c Tip surface 22 Idler pulley 23 Stud 24 Bearing

Claims (1)

(57) [Scope of request for utility model registration] 1. An engine body having a substantially columnar shape from an outer wall surface of the body.
The support part which bulges in is integrally formed, a shaft support part is attached to the tip of the support part, and a nut is screwed in from one end of the support part.
An idler, wherein a bearing is sandwiched and fixed between the support portion and the nut, a pulley body is rotatably mounted via the bearing, and a dust seal inside the bearing also serves as a tip end surface of the support portion. Pulley mounting structure.