JPS6333730Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a parking brake operating device, and particularly to one that aims to reduce manufacturing costs and improve assembly workability.

The parking brake operating device includes a parking brake lever to which a brake cable is connected,
a sector with arcuate ratchet teeth; a pawl that is rotatably attached to the lever and meshes with the ratchet teeth; and spring means for biasing the rod in a direction to protrude from the lever, thereby engaging the pawl with the ratchet teeth.

In this parking brake operating device, the tip of the rod protruding from the lever includes:
A knob is provided to apply operating force to release the engagement between the pawl and the ratchet teeth, but this knob is designed to provide a good feel during operation and to facilitate the assembly of the brake operating device. In order to achieve this, the rod body is manufactured separately from synthetic resin, and the two are screwed together when the device is assembled. That is, in such an operating device, it is necessary to manufacture the rod body and the knob separately, provide screws for each, and screw them together. Since the parking brake operating device is manufactured in

The present invention was developed against the background of the above, and its purpose is to provide a parking brake operating device that can be manufactured at low cost and is easy to assemble.

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

In the figure, 10 is a sector, and the mounting piece 1
At 2 and 14, it is fixed to the vehicle body together with the cover 16. Spread over this sector 10,
A parking brake lever 20 whose base end 18 is bent into a U-shape is rotatably mounted around a pin 22. A pawl 24 is arranged inside the U-shaped base end 18 of the lever 20, and is attached to the lever 20 by a pin 26 so as to be rotatable in a plane parallel to the rotation plane of the lever 20. ing. As shown in FIG. 7, this pawl 24 is provided with a claw portion 28 at one end, and is formed in the sector 10 so as to form an arc around the pivot center line of the lever 20 (i.e., the center line of the pin 22). It is designed to mesh with the ratchet teeth 30, thereby holding the lever 20 at a predetermined angular position corresponding to the meshing position. In addition, 32 is Paul 2
This is a stopper that defines the rotation end of lever 2.
It is formed by partially bending 0 inward.

On the side of the lever 20 (upper side in FIG. 1), there is a holding member 3 for holding the end of the brake cable.
4 is fixed, and this holding member 34 has a cylindrical portion 36 extending substantially in the vertical direction, and a screw member 38 is housed inside the cylindrical portion 36. A brake cable 40 is connected to the lower end of the screw member 38, thereby connecting the cable 40 to the lever 20, and a nut 4 screwed onto the screw member 38.
2, the length of the brake cable 40 extending to a brake device (not shown) can be adjusted. The holding member 34 fits into the recess 44 of the cover 16 together with the lever 20, and is provided with a guide part 46 for guiding the brake cable 40 in this part, and the brake cable 40 is connected to the screw member 38 at the tip end.
After being curved along this guide portion 46, it extends to the outside from a hole 48 provided in the cover 16.

The tip of the lever 20 is formed into a cylindrical shape, and a similarly cylindrical grip 50 is press-fitted and fixed on the outside thereof, and a main body 52 extending along the lever 20 and a knob 54 as an operating part are provided on the inside. A rod 56 made of synthetic resin, which is integrally molded, is inserted. Between the rod 56 and the lever 20, one end contacts the knob 54 and the other end contacts the lever 20.
A hanging piece 5 formed by cutting and bending a part of
A coil spring 60 is interposed which engages the lever 8, thereby causing the rod 56 to move against the lever 20.
It is biased in the direction of protruding from. Rod 5
The main body part 52 of No. 6 has a shape in which opposite sides of a cylinder are cut out with planes parallel to each other, and the end thereof, that is, the end 62 on the opposite side from the knob 54 is shown in FIG. It is formed to have a wide width, and the cut surfaces on both sides thereof can be moved while being guided by the inner wall surface of the lever base end portion 18 which has a U-shape as shown in FIG. A partially circular notch 64 is provided in the center of the wide end 62 from the lower side, and one end of the pole 24, that is, the end opposite to the claw 28, is provided in the notch 64. A partially disc-shaped engagement portion 66 formed in is inserted. Notch 6
4 is a half of a circle whose center is a straight line parallel to the center line of the pin 26 that rotatably supports the pole 24 and whose radius is slightly larger than the radius of the engaging portion 66. It is defined by a concave concave surface 68 that is an arc larger than the circumference, that is, a concave concave surface, and two planes 70 that extend parallel to each other from both ends of the concave concave surface. That is, the partially circular notch 64 is formed so that its opening is slightly smaller than the diameter of the partially disc-shaped engaging part 66 of the pole 24, and the engaging part 66 fitted into the notch 64 is inserted into the notch 64. Although it is relatively rotatable in the notch 64, it is prevented from coming off from the notch 64. Note that since the rod 56 is made of synthetic resin, when the pole 24 is connected to the rod 56, if the pawl engaging portion 66 is pressed from below toward the notch 64, the area around the notch 64 will be elastically deformed. The engaging portion 66 can be easily fitted into the notch 64 by the snap action based on the above. Note that both ends of the notch 64 are closed by end walls 72 to prevent the engaging portion 66 from coming off laterally.

In the above device, when the lever 20 at the lower end of rotation, that is, the non-operating position, is pulled up, the brake cable 40 connected to it is pulled and the brake is applied. The lever 20 is often pulled up without being pushed in. In this case, the pawl 24 is moved over each tooth of the ratchet teeth 30 with its pawl 28 pressed against the sector 10 by the biasing force of the coil spring 60 interposed between the lever 20 and the rod 56. It was then moved. At this time, the pawl 24 is repeatedly rotated in small increments in the clockwise direction and counterclockwise direction in FIG. The high arc concave surface 68 of the rod notch 64 is worn mainly on the right half surface (in FIG. 6), but this wear is caused by the large contact area of the notch 64 with the pole engaging portion 66. Progress of wear is suppressed.

When the lever 20 is rotated a predetermined amount and stopped, the pawl 28 of the pawl 24 engages the ratchet teeth 3.
0, the lever 20 is held in its stopped angular position, and the brake is now activated.

To release the brake, push in the knob 54,
All you have to do is return the lever 20. When the knob 54 is pushed in, since the pawl claw portion 28 and the ratchet teeth 30 are engaged, there is a gap between the pawl engaging portion 66 and the left half surface (in FIG. 6) of the arched concave surface 68 of the rod notch 64. Although a considerably large frictional force is generated, since the contact area between the two is large, wear of the highly arched concave surface 68 is small. Note that the flat surface 72 of the opening of the notch 64 does not come into contact with the pawl 24 and therefore does not wear out. Therefore, even if the highly arcuate concave surface 68 wears out, the engaging portion 66 will not separate from the notch 64.

In this way, the rod 56 in the above device is
The knob 54 and the main body part 52 are integrally constructed, which eliminates the work of manufacturing the knob 54 and the main body part 52 separately, the work of providing screws thereto, and the work of assembling them by screwing them together. Since the device itself can be easily obtained by molding of synthetic resin, the cost and assembly man-hours can be reduced compared to conventional devices.

By the way, in conventional devices, the connection between the rod and the pole is generally performed by a pin connection, and in this case, this connection part is surrounded by the inside of the lever, that is, the U-shaped base end. Therefore, during assembly of the device, it was necessary to connect the two in advance and then store them inside the lever. Moreover, since a spring must be placed between the tip of the lever and the rod, the rod is divided into the main body and the knob, and when assembled, the main body of the rod is inserted from the proximal end of the lever into the cylindrical tip. After passing through the rod, the knob was screwed into the threaded portion at the tip of the rod by pushing in one end of the spring. That is, in conventional devices, the rod main body and the knob are manufactured separately in order to facilitate the assembly work and because it is necessary to construct the knob serving as the operation part from a material with a good feel. was being carried out.

On the other hand, in the above device, the rod 56 is made of synthetic resin having elastic deformability, and the connecting portion with the pole 24 is formed as a partially circular notch 64 that opens downward. It is not necessarily necessary to connect the rod 56 to the pole 24 prior to receiving it in the lever 20, since it can be easily connected to the rod 56 from below by a snap action, and therefore also to the knob 54. This eliminates the need to separate the main body portion 52 and allows them to be integrally molded, thereby achieving the above-mentioned cost reduction and assembly man-hour reduction.

Moreover, since the pawl 24 with the partial disc-shaped engaging part 66 fitted into the rod notch 64 is held by the rod 56 at the engaging part 66, when the central part of the pawl is connected to the lever 20 with a pin, There is no need to separately support the pole when the central portion is pin-coupled to the lever 20, and the assembly has the advantage of being easy to assemble.

In addition, in the above device, the rod 56 and the pole 2
Since the rod 56 and the pole 24 are in contact with each other over a wide area, there is little wear on the rod notch, and this prevents looseness between the rod 56 and the pole 24 during use of the device, making the operating characteristics unstable. There are no problems such as oxidation.

The rod material used in the above device is as follows:
Various synthetic resins such as ABS resin, PBT resin, polycarbonate resin, etc. It can be constructed in various other shapes as long as it has an opening that allows the passage of the pole engaging portion.

As described in detail above, the parking brake operating device according to the present invention includes a parking brake lever to which a brake cable is connected, a parking brake lever that is rotatably supported, and a parking brake operating device that supports a parking brake lever rotatably about the center line of rotation of the lever. a sector provided with ratchet teeth along a circular arc; a pawl attached to the parking lever so as to be rotatable in a direction parallel to the rotational direction of the lever; and a pawl provided with a pawl at one end; A rod whose distal end is relatively rotatably connected to the end thereof and whose distal end protrudes from the distal end of the parking lever; A parking brake operating device including a spring means that engages with the rod and biases the rod in a direction to protrude from the tip of the parking lever, wherein the entire rod is made of a synthetic resin molded product, and the end portion of the rod includes: While forming a partially circular notch having an inner peripheral surface of half a circumference or more centered on a straight line parallel to the rotation center line of the pole,
A partial disk-shaped engaging portion corresponding to the partial circular notch is formed at the other end of the pole, and the engaging portion is attached to the notch by a snap action based on elastic deformation of the peripheral portion of the notch. It is characterized by being inset.

Such a device has excellent advantages such as being inexpensive to manufacture, requiring few man-hours for assembly, and being lightweight.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a parking brake operating device that is an embodiment of the present invention, Fig. 2 is a side view (partial sectional view) of the same device, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 and FIG. 5 are a plan view and a side view (partial sectional view) of the rod in FIGS. 1 and 2, respectively;
FIG. 6 is an enlarged cross-sectional view of the main part of the rod, and FIG. 7 is a side view of the pole in FIGS. 1 and 2. 10: sector, 20: parking brake lever, 24: pole, 28: pawl, 30: ratchet tooth, 40: brake cable, 52: main body,
54: Knob, 56: Rod, 60: Coil spring, 64: Partial circular notch, 66: Engagement portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A parking brake lever to which a brake cable is connected, and a ratchet tooth that rotatably supports the parking lever and is provided along an arc centered on the rotation center line of the lever. a sector attached to the parking lever so as to be rotatable in a direction parallel to the rotational direction of the lever, a pole having a claw portion at one end, and a terminal end portion of the pole being rotatable relative to the other end thereof; a rod connected to the parking lever and having a tip protruding from the tip of the parking lever; A parking brake operating device including a spring means biased in a direction protruding from a tip, wherein the entire rod is made of a synthetic resin molded product, and the rod is provided with a rod parallel to the center line of rotation of the pole at the end portion of the rod. forming a partially circular notch centered on a straight line and having an inner peripheral surface of half a circumference or more, and forming a partially disc-shaped engagement portion corresponding to the partially circular notch at the other end of the pole; A parking brake operating device characterized in that the engaging portion is fitted into the notch by a snap action based on elastic deformation of the peripheral portion of the notch.