JPH0512848U - Control cable dust boot mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the sealing property of the attachment part of the dust boot end to the mouthpiece member and the workability of attaching and detaching. [Structure] An annular groove 7A is formed between the flange 10 and a caulking ring 12 of a protector 11 on the outer periphery of the end of the mouthpiece member 3, and the annular groove 7A is externally fitted to the flange 6 of the dust boot 4. A retainer cap 13 and a clamp member 14 that axially presses and fixes the retainer cap 13 toward the protruding edge portion 6 side of the dust boot 4 are arranged, and the retainer cap 13 and the clamp member 14 project the dust boot 4 from the protrusion. The edge portion 6 is compressed and deformed in the radial direction and the axial direction to form the annular groove 7
The sealing pressure in the radial direction and the axial direction in A is increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dust boot mounting structure for a control cable such as a parking brake cable or a clutch cable of an automobile.

[0002]

[Prior Art]

 FIG. 5 shows a conventional structure. Reference numeral 1 denotes a parking brake cable as a control cable. The parking brake cable 1 is pulled out from a mouthpiece member 3 of a parking lever unit 2 and the other end is a brake not shown. Connected to the unit, the braking operation force of the parking lever unit 2 is transmitted to the brake unit as traction force. A bellows-shaped dust boot 4 made of an elastic material such as rubber is attached to cover a portion of the parking brake cable 1 pulled out from the mouthpiece member 3.

The dust boot 4 is formed with a cable holding portion 5 at one end thereof through which the parking brake cable 1 is slidably slidably inserted, and at the other end thereof, the mouthpiece is provided toward the inner circumference. A protruding edge portion 6 that engages with an annular groove 7 formed on the outer periphery of the end portion of the member 3 is formed, and this protruding edge portion 6 is elastically fixed to the annular groove 7 and fixed. This similar structure is shown, for example, in Japanese Utility Model Laid-Open No. 57-143442.

[0004]

[Problems to be solved by the device]

 The projecting edge portion 6 has an inner diameter smaller than the outer diameter of the groove bottom of the annular groove 7, and a thickness dimension in the width direction set to be slightly larger than the groove width of the annular groove 7 to elastically engage the annular groove 7. Thus, the sealing pressure is obtained in the radial direction and the axial direction in the annular groove 7. However, this sealing pressure depends only on the elasticity of the projecting edge portion 6 and cannot be made sufficiently large. Yes. That is, in order to increase the sealing pressure, the inner diameter of the projecting edge portion 6 may be made smaller and the pressure in the width direction may be made larger. However, considering the attachment property to the annular groove 7, Naturally, there is a limit to reducing the diameter and increasing the wall thickness, and there is also a limit to the setting of sealing pressure. In addition, since the projecting edge portion 6 is elastically deformed and twisted into the annular groove 7 to be engaged with the annular groove 7, the mounting workability also deteriorates. On the other hand, in order to compensate for the above-mentioned lack of sealing pressure, the projecting edge portion 6 may be clamped from the outer periphery by a crimp ring, but in this case, the dust boot 4 is not disassembled by mounting the crimp ring. Therefore, inconvenience occurs that it becomes impossible to lubricate grease or the like.

Therefore, the present invention provides a control cable that is excellent in workability of attaching the end portion of the dust boot to the mouthpiece member, and that can sufficiently increase the sealing pressure to further improve the sealing performance. A dust boot mounting structure is provided.

[0006]

[Means for Solving the Problems]

 A bellows-shaped dust boot is attached to cover the portion of the control cable that is pulled out from the base member, and the edge of the dust boot that is formed toward the inner circumference is attached to the end of the base member. A retainer cap that is elastically engaged with the annular groove formed on the outer peripheral surface of the dust boot is fitted to the annular groove, and the retainer cap is fitted to the protruding edge portion of the dust boot. The retainer cap is attached to the protruding edge portion of the dust boot by a clamp member. It is pressed and fixed in the axial direction, and the protruding edge portion is pressed and fixed in the annular groove in the radial direction and the axial direction.

[0007]

[Action]

 By axially pressing the retainer cap against the protruding edge portion of the dust boot by the clamp member, the protruding edge portion of the end portion of the dust boot is compressed and deformed between the retainer cap and the side edge of the annular groove. By the compressive deformation in the width direction of the projecting edge portion, that is, in the axial direction of the die member, the projecting edge portion tends to increase in diameter toward the outer peripheral side, but this increase in diameter is suppressed by the retainer cap. As a result, the sealing pressure (contact pressure) in the radial direction and the axial direction of the projecting edge portion is increased in the annular groove.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings by attaching the same reference numerals to the same portions as those of the conventional configuration.

1 to 3, reference numeral 1 denotes a parking brake cable as a control cable. The parking brake cable 1 is pulled out from a cap member 3 of a parking lever unit 2 and the other end is connected to a brake unit not shown. It is connected.

A flange 10 is formed at the end of the mouthpiece member 3, and a protector 11 is externally mounted on the mouthpiece member 3, and the end of the protector 11 is tightened to the outer periphery of the mouthpiece member 3 with a caulking ring 12. , Is fixed, and an annular groove 7A is formed between the caulking ring 12 and the flange 10 with a required width.

The bellows-shaped dust boot 4 made of an elastic member mounted so as to cover the pulled-out portion of the parking brake cable 1 from the mouthpiece member 3 has a projecting edge portion 6 at the end thereof, and has an inner diameter outside the groove bottom portion of the annular groove 7A. It is formed smaller than the diameter and is elastically engaged with the annular groove 7A. A retainer cap 13 is loosely fitted in the annular groove 7A, and the retainer cap 13 is externally fitted to the projecting edge portion 6 of the dust boot 4.

A clamp member 14 is press-fitted and arranged between the crimp ring 12 of the annular groove 7 A and the side wall 13 a of the retainer cap 13, and the retainer cap 13 is dusted by the clamp member 14. The boot 4 is pressed and fixed axially, specifically, toward the flange 10 toward the projecting edge portion 6 of the boot 4, and the projecting edge portion 6 is pressed and fixed in the annular groove 7A in the radial direction and the axial direction. There is.

The clamp member 14 includes an annular portion 14a that fits into the groove bottom of the annular groove 7A, and a pair of fastening pieces 14b for sandwiching the annular portion 14a on the groove bottom. .. A taper portion 14c is formed on each side edge of each of the fastening pieces 14b and 14b so as to be easily inserted between the caulking ring 12 and the side wall 13a of the retainer cap 13, and these fastening pieces 14b and 14b are formed. The tapered portion 14c of the above is used as an insertion guide portion to push open between the caulking ring 12 and the side wall 13a, and the annular portion 14a is fitted to the groove bottom of the annular groove 7A, and the tightening pieces 14b and 14b are bolted. -By tightening and fixing with the nut 15, the retainer cap 13 is pressed and fixed to the flange 10 side by the annular portion 14a.

By thus pressing and fixing the retainer cap 13 to the flange 10 side with the clamp member 14, the projecting edge portion 6 is axially compressed between the side wall 13 a of the retainer cap 13 and the flange 10. The axial sealing pressure (surface pressure) of the annular groove 7A is increased. Due to the axial compressive deformation of the projecting edge portion 6, the projecting edge portion 6 tends to increase in diameter toward the outer peripheral side, but since the circumferential wall 13b of the retainer cap 13 suppresses this increase in diameter, the projecting edge portion 6 is prevented. In addition to the elasticity of itself, the inner periphery of the outer peripheral surface of the dust boot 4 further strongly adheres to the outer peripheral surface of the groove bottom, and the outer peripheral portion of the end portion of the dust boot 4 adheres strongly to the peripheral wall 13b of the retainer cap 13, which results in a radial sealing pressure in the annular groove 7A ( The surface pressure) is increased.

In addition to such a sealing effect, when mounting the end of the dust boot 4 on the mouthpiece member 3, the end on the side where the projecting edge 6 is formed is expanded in diameter to pass over the flange 10 to form an annular shape. The retainer cap 13 is elastically engaged with the groove 7A, and then the retainer cap 13 is slid in the axial direction to be externally fitted to the end portion, the clamp member 14 is press-fitted into the annular groove 7A, and the bolt / nut 15 is fastened to the retainer cap. By pressing and fixing 13, the projecting edge portion 6 can be surely compressed and deformed to be attached, so that the assembling workability is good, and the projecting edge portion is screwed into the annular groove as in the conventional case. In addition, the projecting edge does not lift up in the annular groove and cause a seal failure.

FIG. 4 shows a second embodiment of the present invention. An annular seal lip 6a is formed on the inner peripheral edge of the projecting edge portion 6 on the side close to the side wall 13a of the retainer cap 13, and the seal lip 6a is formed. A peripheral groove 6b is formed in the molding base portion on the outer peripheral side of 6a. According to this embodiment, the seal lip 6a can perform multi-stage sealing, the intrusion water can be captured by the circumferential groove 6b, and the sealing performance can be further enhanced. In some cases, the circumferential groove 6b and the seal lip 6a can be sealed. It is also possible to improve the sealing performance by filling grease in the gap portion of the molding base on the inner peripheral side.

[0017]

[Effect of the device]

 As described above, according to the present invention, the protruding edge portion of the end portion of the dust boot is compressed and deformed in the radial direction and the axial direction by the retainer cap and the clamp member, and the diameter in the annular groove of the mouthpiece member is increased. The sealing pressure in the axial and axial directions can be increased, and the sealing performance can be further improved.

In addition, when attaching the protruding edge portion to the annular groove, no troublesome prying work is involved, and the work of fitting the retainer cap, the press-fitting of the clamp member, and the fastening work are sufficient, resulting in good workability. In addition, since the sealing failure due to the mounting failure does not occur and the end of the dust boot can be easily removed from the mouthpiece by removing the clamp member, maintenance, inspection and lubrication can be performed. Etc. can be done easily.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same embodiment with the clamp member removed.

FIG. 3 is a side view of a clamp member.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control cable, 3 ... Base member, 4 ... Dust boot, 6 ... Projection edge part, 7A ... Annular groove, 13 ... Retainer cap, 14 ... Clamp member.

Claims (1)

[Scope of utility model registration request] 1. A bellows-shaped dust boot is mounted so as to cover a portion of the control cable that is pulled out from the mouthpiece member, and a projecting edge portion formed toward the inner circumference at an end portion of the dust boot on the mouthpiece member side is provided with the mouthpiece member. Of the dust boot is elastically engaged with the annular groove formed on the outer periphery of the end of the dust boot, and a retainer cap is fitted in the annular groove so as to be fitted onto the projecting edge portion of the dust boot. A dust boot mounting structure for a control cable, characterized in that it is pressed and fixed to an edge portion in an axial direction, and the protruding edge portion is pressed and fixed in a radial direction and an axial direction in an annular groove.