JPS621500Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boot seal for preventing water, dust, etc. from entering the sliding portion of a slide shaft of an automobile or the like.

Normally, this type of boot seal is relatively often used as shown in Figure 3, but in cases where the swinging angle of the ball stud is required to be large, the inner circumferential surface of the bellows and the outer circumferential surface of the socket are in contact with each other. However, in order to prevent the bellows from cracking due to wear and contact, some bellows have a larger inner diameter, but this increases the size of the boot seal and increases costs. Furthermore, due to the increased size, the weight increases, making it easier for the bellows to fall in, which can lead to problems such as the inner circumferential surface of the bellows getting caught between the tightening nut at the socket end and the end of the rack bar housing. Ta. In order to prevent this, there is a method of clamping one end of the bellows onto the outer periphery of the socket, but this method does not allow sufficient sliding stroke of the slide shaft due to the compression of the bellows (dimension D). This caused a problem in seal durability (see compressed state D of the bellows in Figure 3). In addition, the assembly required many man-hours, resulting in high costs.

The present invention aims to eliminate these drawbacks, and by providing a support part (ordinary cylindrical part) into which the ball joint socket is fitted within the boot seal, the swinging movement of the ball socket prevents the boot seal from moving in the direction perpendicular to the axis of the boot seal. It is designed to stop the movement of.

The present invention will be explained in more detail below with reference to Examples.

FIG. 1 is a cross-sectional view of an embodiment of the boot seal according to the present invention. The socket fitting support part 5 branches from a part of the cover part 2 that is connected to the bellows part 3, has a substantially cylindrical shape, extends inside the bellows part 3, and has a tip bent slightly inward so as not to come off.

FIG. 2 shows a sectional view of the boot seal shown in FIG. 1 assembled as a ball joint assembly, in which 6 is a ball stud, 7 is a ball joint socket, 8 and 9 are clamps, and 10 is a ball joint assembly.
11 shows the compression state of the rack bar housing and the dotted line 11 shows the boot seal.

As shown in Figs. 1 and 2, when a bearing portion 5 for fitting a ball joint socket is provided, the movement of the bellows portion located outside the bearing portion 5 in the direction perpendicular to the axis is restricted, and even if the ball stud swings widely, the bellows portion 3 does not easily come into contact with the ball joint socket 7 as in the conventional case. Also, the socket fitting bearing portion 5 has only one end connected to the vicinity of the connection portion between the cover portion 2 and the bellows portion 3, and is structured to extend inward of the bellows portion 3, so that the effective length of the bellows portion 3 is the length of the socket fitting bearing portion 5.
The socket fitting support portion 5 is the same as that without the cover portion 2 and the bellows portion 3.
Since the axial expansion and contraction of the boot seal is not affected at all, the expansion and contraction stroke of the boot seal can be sufficiently secured. Also, there is no need to clamp the boot seal to the socket portion. Furthermore, when the pleats of the bellows portion approach a tight contact state (see 11), the socket fitting support portion 5 slides relatively to the socket 7 toward the small diameter mounting portion, preventing the pleats of the bellows from coming into a pressure-contact state as in the conventional case (see Figure 2C).

Note that it is possible to tightly fit the ball joint socket onto the outer periphery of the ball joint socket using the elasticity of the fitting support part in the boot seal. Since there is no need for clamping as in the conventional method, advantages such as parts can be omitted can be obtained.

Although the support part 5 can be formed integrally with the boot seal part as in the above embodiment, it is also possible to form and join this separately.

[Brief explanation of the drawing]

Figure 1 is a half-longitudinal cross-sectional view of the invented boot seal.
FIG. 2 is a longitudinal sectional view showing the installed state of the boot seal of the present invention. FIG. 3 is a longitudinal cross-sectional view showing a state in which a conventional boot seal is attached. 1...Small diameter mounting part, 2...Cover part, 3...Bellows part, 4...Large diameter mounting part, 5...Socket fitting support part, 6...Ball stud, 7...Ball joint socket.

Claims (1)

[Scope of utility model registration request] A boot seal between members that slide relative to each other in the axial direction has a small-diameter mounting part at the end and a cover part at the end, and a substantially cylindrical part that is fitted over the circumference of the ball joint socket from the cover part. The bellows part is branched into a shaped support part and a bellows part, and the support part extends in the axial direction inside the bellows part, and the other end of the bellows part is connected to a large diameter mounting part. boot seal.