JPH0516057Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cable for a parking brake of a vehicle, and in particular, a seal is inserted into the casing cap to prevent water, dust, etc. from entering from the outside. This invention relates to a parking brake cable seal structure that can ensure stable sealing performance.

BACKGROUND ART Conventionally, an example of a seal structure for a parking brake cable for a vehicle is shown in FIG. 3. A parking brake cable with this conventional seal structure has two ends: a brake operating part (not shown) and a brake operating part (not shown).
Inner cables 1 connected to the outer casing 2 slideably pass through the outer casing 2. The outer casing 2 has a casing cap 3 at its end, and both ends of such a parking brake cable are held in the casing cap 3 by means of a mounting bracket 9, so that the cable can be connected to the brake operating part and in the vicinity of the brake operating part. are fixed to a vehicle body (not shown), respectively, and the force applied to the brake operating section is transmitted to the brake operating section via the inner cable 1 without shorting. In addition, the outer casing 2 is generally used for the purpose of efficiently transmitting force.
It is constructed of a cylinder of coiled windings with no gaps so as not to contract due to the compressive force in the axial direction, and a water-resistant outer skin 4 is provided on the outer periphery for waterproofing. Furthermore, a sealing material 5 made of rubber or the like is attached to the casing cap 3 to prevent water, dust, etc. from entering through the gap between the outer casing 2 and the inner cable 1. This attachment structure of the sealing material 5 is such that the sealing material 5 held between the sockets 8 is connected to the step 7 of the inner cavity of the casing cap 3 and the end surface of the rigid cylinder of the outer casing 2 (in this case, the cylinder of the coiled winding). The flange portion 6 of the sealing material 5 protruding from the annular portion of the socket 8 touches the stepped portion 7 of the inner cavity of the casing cap 3.
is in contact with.

Problems to be Solved by the Invention However, in the parking brake cable seal structure constructed as described above, since the cable is bent and runs along the vehicle body, it is difficult to operate the brake operating section. If a tensile force is applied to the inner cable 1, the outer casing 2
A compressive force acts between the fixed points, and as a result, the flange portion 6 of the sealing material 5 is compressed by the socket 8 and the stepped portion 7 of the casing cap 3. When the sealing material 5 is compressed in the axial direction, the sealing material 5 expands in the axial direction with respect to the axial direction, strongly compressing the contact surface with the inner cable 1, and in some cases, the socket 8 and the casing cap. 3, or secondary damage due to the compressive force caused by the reaction force from the inner cable 1, or the sealing effect decreases after the force is removed due to plastic deformation. I am forced to do so. Moreover, even if the sealing material 5 does not become damaged, the sealing material 5 is at least deformed, so that the sealing effect is reduced at that point.

Furthermore, when the inner cable 1 is pulled, the flange portion 6 of the sealing material 5 is compressed, and the compressed amount shortens the length of the outer casing 2 between the casing caps 3 at both ends of the attached parking cable. This was an inconvenience as the parking cables were dangling.

Therefore, an object of the present invention is to prevent compressive force from being applied to the sealing material 5 during brake operation.

Means for Solving the Problems The present invention comprises an outer casing, an inner cable slidably passing through the outer casing, a casing cap provided at an end of the outer casing, and a casing cap 3. In a parking brake cable seal structure comprising a sealing material held between a socket loaded into a stepped portion of the inner cavity, a portion of an axial end surface of the annular portion of the socket is connected to the stepped portion of the inner cavity of the casing cap. It is characterized by being adapted to come into contact with the end face of.

Function: Therefore, since the end of the annular part of the socket that holds the sealing material is in contact with the end surface of the stepped part of the inner cavity of the casing cap, the sealing material is subjected to compressive force due to the tension of the inner cable when the brake is operated. This eliminates the disadvantages caused by compression of the flange portion of the sealing material.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 and 2.

Figure 1 shows the installation state of the brake part A side, which is the driven side of the parking brake cable.
A casing cap 3 at one end of the outer casing 2 is fixed to the brake part A by a mounting bracket 9, so that the inner cable 1 can slide in response to a brake operation.

Figure 2 shows an outer casing 2 that is made of a rigid cylinder such as a coiled winding cylinder with no gaps and has a structure that does not contract under compressive force in the axial direction, and an outer casing 2 that freely slides through the inside of the outer casing 2. , an inner cable 1 whose ends are connected to a brake operating section (not shown) and a brake operating section A, and a casing cap 3 provided at the end of the outer casing 2 and attached to the vehicle body via a mounting bracket 9 or the like. and,
A parking brake cable mounting structure is shown, which includes a sealing material 5 made of an elastic material such as rubber, which is provided through a socket 8 to the stepped portion 7 of the inner cavity of the casing cap 3. Then, all or part of the axial end surface of the annular portion of the socket 8 is extended into a leg shape to form the stepped portion 7 of the inner cavity of the casing cap 3.
It is designed to come into direct contact with the end face of the

Now, when the parking brake is operated and a tensile force is applied to the inner cable 1, a compressive force is applied to the outer casing 2, and the socket 8 is pushed inside the casing cap 3 by the end surface of the cylinder of the coiled winding of the outer casing 2. It is pushed in the direction of the end surface of the stepped portion 7 of the cavity, and further, the axial end surface of the annular portion of the socket 8 directly pushes the end surface of the stepped portion 7 of the internal cavity of the casing cap 3, causing a problem to occur in the sealing portion. The compressive force acts on the socket 8 itself and does not act on the sealing material 5.

Note that as a means for bringing the axial end surface of the annular portion of the socket 8 into contact with the end surface of the stepped portion 7 of the inner cavity of the casing cap 3, instead of extending part or all of the socket 8 itself, a third As shown in the figure, it is also an aspect of the present invention to provide a protrusion 10 in the inner cavity of the casing cap 3 that abuts the axial end surface of the annular portion of the socket 8.

Effects of the invention As described above, according to the invention, by only slightly improving the socket part, when the brake is operated and compressive force is generated in the outer casing, the sealing material is protected by the socket and is not compressed. This prevents damage, deformation, or deterioration of the sealing material, ensuring stable sealing performance of the sealing material and preventing dangers due to abnormalities in the parking brake cable. can do.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an embodiment of the parking brake cable of the present invention, Fig. 2 is a partial sectional view of an embodiment of the seal structure of the parking brake cable, and Fig. 3 is a schematic diagram of an embodiment of the parking brake cable of the present invention. It is a partially sectional view. 1...Inner cable, 2...Outer casing, 3...Casing cap, 4...Outer cover, 5
... sealing material, 6 ... flange section, 7 ... step section,
8...Socket, 9...Mounting bracket, A
...Brake operation section.

Claims (1)

[Scope of utility model registration request] Outer casing 2 and Outer casing 2
It is held between an inner cable 1 slidably passing through the inner casing 2, a casing cap 3 provided at the end of the outer casing 2, and a socket 8 loaded into a stepped portion 7 of the inner cavity of the casing cap 3. In the parking brake cable seal structure including the sealing material 5, at least a part of the end surface of the annular portion of the socket 8 in the axial direction is brought into contact with the end surface of the stepped portion 7 of the inner cavity of the casing cap 3. A parking brake cable seal structure characterized by: