JPH032736Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a boot shape of a drive shaft provided in a vehicle such as an automobile. For more details,
This relates to the shape of the end of the boot that is attached to the joint of the drive shaft.

[Conventional technology]

Conventionally, a joint portion is sometimes provided in a drive shaft of a vehicle such as an automobile. A boot made of rubber or synthetic resin is attached to this joint part for waterproofing and dustproofing purposes.

FIG. 5 shows an example of the arrangement of a drive shaft in an automobile.

In Fig. 5, 10 indicates the drive shaft;
Reference numeral 12 indicates a joint, and reference numeral 14 indicates a boot, and the drive shaft 10 transmits rotational driving force to the wheels 16 via the joint 12. The boot 14 is made of rubber and is attached to both the drive shaft 10 and the joint portion 12. That is, one end of the boot 12 is attached to the joint portion 12, and the other end is attached to the drive shaft 10.

In FIG. 5, reference numeral 18 indicates a knuckle arm, and reference numeral 20 indicates a shock absorber of a strut type suspension. Since these are all well-known parts, detailed explanation will be omitted.

3 and 4 show a structure for attaching the boot 14 to the joint boot 12.

As shown in FIG. 3, the boot 14 is formed in a bellows shape, and the attachment portion 14a at one end thereof is
It is attached to the outer race 12a of the joint portion 12 by being tightened by a band 22.

The end portion 14b of the attachment portion 14a of the boot 14 is formed into a vertically raised shape, as clearly shown in FIG.

In addition, as shown in FIG. 3, the joint portion 12
Other parts 30 of the suspension device are arranged in close proximity to . The other parts are 30.
For example, the knuckle arm 18 shown in FIG. 5 is used.

Further, the joint portion 12 is connected to the outer race 12.
In addition to a, the ball 12c includes an inner race 12b and a ball 12c interposed between the inner race 12b and the outer race 12a. 12d is a cage for the ball 12c.

[Problem that the invention attempts to solve]

However, in the conventional structure as described above,
As shown in FIG.
If the foreign object 40 falls between the foreign object 40 and other parts 30 such as the knuckle arm 18, the end portion 14b of the boot 14 is formed to stand up vertically, so the foreign object 40 will be difficult to dislodge and remain trapped. , this foreign object may damage the end 14 of the boot 14.
This may cause problems such as damage to b.

Therefore, the problems that this invention attempts to solve are:
The purpose is to prevent damage to the end of the boot caused by foreign objects such as flying stones.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems by making the end of the boot so shaped that even if a foreign object such as a flying stone flies into the end of the boot, the foreign object can easily escape.

Specifically, the present invention provides a boot with an attachment part installed on the joint part and a member provided so as to cover part or all of the joint part of the driveshaft in a manner that spreads toward the end. On the other hand, the end shape of the attachment part that is non-contact is made into a chamfered shape or a curved shape that gradually becomes thicker toward the bellows-shaped part, and the space between the inner surface of the member and the outer circumferential surface of the attachment part is formed toward the bellows-shaped part. Measures are taken to gradually form it into an unexpanded form.

[Effect]

According to the above-mentioned means, it is devised so that foreign objects that have jumped into the space can easily escape. Specifically, if a foreign object were to fly into the space between the boot attachment part and the member due to the direction of the bellows-shaped part of the boot, the end shape of the boot attachment part would turn into the bellows-shaped part. By having a chamfered shape or a curved shape that gradually becomes thicker toward the bellows-shaped portion, when a foreign object tries to escape toward the bellows-shaped portion, there is less catching resistance, and the foreign object can escape extremely easily. Become.

Moreover, the "member provided so as to cover part or all of the joint portion in a manner that spreads toward the end" may be a fixed member or a member that rotates together with the joint portion. If the member is a rotating member, the member is provided with a gap (space) from the mounting part of the boot so as to cover it in a widening manner. A component of centrifugal force will act.
Due to this force, the foreign object can easily escape by its own action. In addition, if the member is a fixed member, the direction in which the member widens toward the end and the direction in which the end face shape of the boot becomes thick are not opposite but the same direction, and the rate of change in the distance between the member and the boot is small. It's starting to happen. This also makes it easier for foreign objects to escape.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

In each of the embodiments shown below, parts that are the same as or corresponding to the conventional structure described above are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of the boot shape of a drive shaft according to the present invention.

The attachment portion 14a of the boot 14 is attached to the outer lace 12a of the joint portion 12 by a band 22 in the same manner as in the prior art. The end portion 14b of the attachment portion 14a of the boot 14 is chamfered by a width C. That is, the end portion 14b of the boot 14 has a chamfered shape.

Since the end portion 14b of the boot 14 is chamfered in this way, as shown by the chain line in FIG.
Even if the foreign object 40 jumps between the joint part 12 at position 4b and another part 30 provided to cover part or all of this joint part 12 in a way that spreads out, the foreign object 40 will not be able to reach the bellows as shown by the arrow. When trying to get out toward the shaped part, the resistance to getting caught is reduced, the user can easily get out to the solid line position, and the end 14b of the boot 14 will not be damaged.

FIG. 2 shows a second embodiment of the boot shape of the drive shaft according to the present invention.

This second embodiment includes an end 14b of the boot 14.
The shape is formed as a curved shape with a radius R. The rest of the structure is the same as the first embodiment described above.

Even when the end portion 14b is formed into a curved shape as in this second embodiment, even if a foreign object 40 jumps in, as shown by the chain line in FIG.
As shown by the arrow, 0 is toward the bellows-shaped portion and when trying to escape, there is less catching resistance, and it can easily escape to the solid line position, preventing damage to the end 14b of the boot 14. There is no.

Although the present invention has been described above with reference to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention.

For example, the joint part 12 is also provided on the differential side of the drive shaft 10, and the boots attached to the joint part on the differential side can also be configured in the same manner as in each of the above-described embodiments. The same effect as in the example can be achieved.

[Effects of the invention] As detailed above, according to the invention, by making the end shape of the boot chamfered or curved, foreign objects that fly into the end position of the boot are directed toward the bellows-shaped portion. When trying to get out, the resistance to getting caught is reduced and the foreign object can easily escape, thereby preventing the end of the boot from being damaged by the foreign object.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the boot shape of a drive shaft according to the present invention. FIG. 2 is a sectional view showing a second embodiment of the boot shape of the drive shaft according to the present invention. 3 and 4 show the shape of a conventional drive shaft boot, with FIG. 3 being a half-cut sectional view, and FIG. 4 being an enlarged sectional view of the end portion of the boot. FIG. 5 is a configuration diagram showing the arrangement of the drive shaft. Explanation of symbols, 10... Drive shaft, 12
...Joint part, 14...Boots, 14b...
the edge of the boot.

Claims (1)

[Scope of utility model registration request] A mounting part is provided between the joint part of the drive shaft and a member provided so as to cover part or all of the joint part without spreading, and is attached to the joint part, and does not contact the member. In the boot, the end shape of the attachment part is chamfered or curved so that it gradually becomes thicker toward the bellows-shaped part, and the space between the inner surface of the member and the outer peripheral surface of the attachment part is gradually unwidened toward the bellows-shaped part. The boot shape of the drive shaft is characterized by its shape.