JP6228053B2 - Mechanical disc brake - Google Patents

Description

  The present invention relates to a mechanical disc brake, and more particularly to a disc brake driven by a camshaft and a push rod.

Japanese Patent Laid-Open No. 2003-294063

  As a disc brake for a vehicle, and particularly a disc brake driven by a camshaft and a push rod, there is already a prior art as disclosed in Patent Document 1.

  By the way, since the invention described in Patent Document 1 has two systems, that is, driving by a camshaft and driving by hydraulic pressure, an adjuster (26) in which the piston moves forward even if the friction pad lining wears is interposed. The adjuster (26) adjusts the lining due to wear. However, in the case of a disc brake that does not have a hydraulic system, the position of the camshaft needs to be adjusted by a separate mechanism.

  Accordingly, the present invention is intended to solve the above-described problems, and an object of the present invention is to obtain a mechanical disc brake that can be adjusted by lining wear of a friction pad with a simple configuration.

  In order to solve the above-described problems, the present invention includes a caliper body having a cylinder hole through which a piston slides and a camshaft insertion hole through which the camshaft is inserted. The caliper body is connected to the camshaft and pulled by the connecting means. It is premised on a mechanical disc brake in which a push rod pushes a piston by turning of a turning arm that operates the camshaft, and a friction pad is slidably contacted with a disc rotor by advance of the piston.

  The rotating arm is screwed to the camshaft, and the rotating arm and a nut are screwed and fixed to the camshaft with a double nut structure.

  As described above, according to the present invention, the friction pad lining wear can be adjusted by a simple configuration in which the camshaft is rotated and the rotating arm and the nut are fixed at an appropriate position by a double nut configuration. It becomes possible. Moreover, since the position of the camshaft can be adjusted steplessly, the degree of freedom of adjustment can be improved.

Sectional drawing which shows Example 1 of this invention. Sectional drawing which shows Example 1 and is perpendicular | vertical to FIG. FIG. 3 is a side view showing Example 1; Sectional drawing which shows the engagement state of a friction pad and a hanger pin in Example 1. FIG. FIG. 2 is a plan view showing Example 1;

  Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5. (1) is a caliper body of a mechanical disc brake, and this caliper body (1) is formed on both sides of a disc rotor (2) as shown in FIG. The action part (3), the reaction part (4), and the bridge part (5) connecting the action part (3) and the reaction part (4) via the insertion interval of the disk rotor (2). It consists of.

  The action portion (3) is provided with a cam insertion portion (6). This cam insertion part (6) is for forming a camshaft insertion hole (8) through which the camshaft (7) is inserted, and is provided adjacent to the cylinder (9) of the action part (3). It is a thing. The cam insertion portion (6) is formed and arranged in the radial direction of the caliper body (1) as shown in FIG. 1, and its external shape is symmetrical in the radial direction of the disc, that is, in the vertical direction in FIG. It is supposed to be. The vertical direction described in the present embodiment is based on the vertical direction of FIGS.

  In this way, the cam insertion portion (6) is formed in the radial direction of the disk of the caliper body (1), and the outer shape thereof is formed symmetrically in the vertical direction, thereby forming the upper end of the cam insertion portion (6) in the formation direction. The camshaft insertion hole (8) can be formed from either the (28) side or the lower end (30) side. Therefore, it is possible to improve the degree of freedom in the take-out direction of the rotating arm (10) assembled to the camshaft (7), and the mounting property to the vehicle is improved.

  The cam insertion portion (6) of the present embodiment is formed with a cam shaft insertion hole (8) having a bottom in the disk radial direction from the upper end (28) side of the cam insertion portion (6) downward. ing. In this embodiment, the cam shaft insertion hole (8) is formed from the upper end (28) side of the cam insertion portion (6) as described above, but in other different embodiments, the cam insertion is not limited thereto. It is also possible to form the camshaft insertion hole (8) from the lower end (30) side of the part (6) upward.

  Further, as shown in FIG. 1, a cylinder hole (11) having an opening on the disc rotor (2) side is directed to the cam insertion portion (6) side on the action portion (3) side of the disc rotor (2). It is recessed. A piston (12) having a cup-shaped cross section is inserted into the cylinder hole (11), and a U-shaped recess (13) is formed at the center of the bottom surface (31) of the piston (12). (12) Recessed inward. The camshaft insertion hole (8) is formed and arranged in a state of penetrating between the bottom surface (14) of the cylinder hole (11) and the piston (12).

  The camshaft (7) is inserted into the camshaft insertion hole (8) formed as described above, and the base end (15) side of the camshaft (7) is connected to the cam insertion portion (6) as shown in FIG. ) Projecting outward. The camshaft (7) is provided with a cam groove (16) at a position corresponding to the inner surface (32) of the recess of the piston (12), as shown in FIG. 32) and a push rod (17) is inserted between them.

  Further, as shown in FIG. 1, a screw groove is formed on the outer periphery of the base end (15) side of the camshaft (7), and one end (18) side of the rotating arm (10) is screwed into this screw groove. . Then, from above the pivoting arm (10) screwed in this way, the nut (20) is further screwed to the camshaft (7) to fasten the pivoting arm (10) to the camshaft (7). It is fixed. In this way, the rotating arm (10) is screwed to the camshaft (7), and the nut (20) is screwed and fastened to the camshaft (7) from above the rotating arm (10). In (7), the rotating arm (10) and the nut (20) are screwed and fixed in a double nut configuration. The push rod (17) is made of a magnet, and the camshaft (7) and the piston (12) are made of a magnetic material.

  Further, as shown in FIG. 3, the rotating arm (10) extends from the cam insertion portion (6) side of the caliper body (1) to the reaction portion (4) side along the caliper body (1). Forming. By forming and arranging the pivot arm (10) along the caliper body (1) in this way, it is not necessary to take more space than necessary around the disc brake, so that it can be easily mounted on the vehicle. it can.

  One end of a brake wire (not shown) is connected to the tip of the pivot arm (10), and the other end of the brake wire is connected to a brake operation such as a brake pedal or a brake lever operated by the driver. It is connected to a child (not shown). As shown in FIGS. 4 and 5, a projecting portion (37) is formed on one end (18) side of the rotating arm (10) so as to project on the stopper (38) side formed on the caliper body (1). .

  In addition, a pair of friction pads (21) and (22) are disposed opposite each other with the disk rotor (2) interposed between the action part (3) and the reaction part (4). The pair of friction pads (21) and (22) are formed by bonding linings (40) and (41) to back plates (42) and (43), and have an action part (3) and a reaction part (4). Are slidably engaged with the hanger pins (23) installed between them. As shown in FIG. 1, a return spring (24) formed by a linear spring is provided between the friction pad (21) on the action part (3) side and the friction pad (22) on the reaction part (4) side. It is intervening.

  This return spring (24) is provided inside the bridge portion (5) of the caliper body (1) as shown in FIG. 1, and is a coil spring shape portion (25) in which a linear spring is formed into a coil spring shape. Is provided. Then, as shown in FIG. 4, the coil spring shape portion (25) is inserted into the hanger pin (23) so that the return spring (24) is engaged with the hanger pin (23).

  Also, the lower end of the return spring (24) is placed in contact with both friction pads (21) and (22) from the outer peripheral side in the disk radial direction of the friction pads (21) and (22), respectively. A contact portion (34) is provided. Further, the upper end portion of the return spring (24) is disposed in contact with the inner central portion (36) of the bridge portion (5). As described above, the return spring (24) is formed and assembled, and by placing it in contact with both friction pads (21) and (22), the contact portion (34) and the inner central portion (36) of the bridge portion (5) The coil spring shape portion (25) is located between the two. Further, by providing the return spring (24) inside the bridge portion (5) as described above, the return spring (24) can be provided at a position not exposed to the outside of the caliper body (1), and the caliper body ( Since it is not necessary to consider the outer shape of 1), the degree of freedom in design can be improved.

  The biasing force of the return spring (24) causes the friction pad (21) on the action part (3) side to move toward the tip part (26) of the piston (12), and the friction pad (on the reaction part (4) side) ( 22) is urged in the direction of the inner surface (27) of the reaction part (4). Therefore, when not operating, the friction pad (21) on the action part (3) side is disposed in contact with the piston (12) in the state of being biased toward the tip part (26), and on the reaction part (4) side. The friction pad (22) is placed in contact with the reaction portion (4) while being urged toward the inner surface (27). By providing the return spring (24) as described above, the friction pads (21) and (22) are reliably moved in the separation direction of the disc rotor (2) when the piston (12) is returned to the return side when the brake is released. Therefore, drag can be reduced more reliably.

  A case where the mechanical disc brake is braked in the above-described configuration will be described below. First, before braking, a brake operator (not shown) resists the biasing force of a return spring (19) interposed between the caliper body (1) and the rotating arm (10). By pulling a brake wire (not shown), the rotating arm (10) rotates in one direction. The camshaft (7) rotates in the same direction as the rotating arm (10) as the rotating arm (10) rotates.

  As described above, when the camshaft (7) rotates, the cam groove (16) rotates, the push rod (17) is pushed toward the piston (12), and the piston (12) moves toward the disc rotor (2). To slide. As a result, the friction pad (21) on the action part (3) side is pressed against the disk rotor (2) side by the piston (12) against the urging force of the return spring (24), and the surface of the disk rotor (2) It will be pressed against.

  The caliper body (1) is moved in a direction opposite to the moving direction of the piston (12) due to the reaction force accompanying the movement of the friction pad (21) on the side of the action part (3), and the caliper body (1 ) Moves the friction pad (22) on the reaction part (4) side against the biasing force of the return spring (24) against the disk rotor (2), and the reaction part (4) of the disk rotor (2). It is pressed against the side surface.

  As a result, a pair of friction pads (21) and (22) respectively provided on the action part (3) side and the reaction part (4) are brought into pressure contact with both sides of the disk rotor (2) to perform braking by a mechanical disk brake. .

  Next, the release of braking will be described below. First, by releasing the traction of the brake wire by operating the brake operator, the rotating arm (10) is moved to the initial position before the start of braking by the urging force of the return spring (19). Restore to. At the same time, the camshaft (7) rotates in the opposite direction to that during braking and returns to the position before starting braking. At this time, since the push rod (17) is formed of a magnet and the cam shaft (7) and the piston (12) are formed of a magnetic material, the cam shaft (7) moves to the original position and is pushed at the same time. The rod (17) and the piston (12) move together with the camshaft (7) to the opposite side of the disk rotor (2) side by the magnetic force, and return to the original position.

  Thus, the push rod (17) and the piston (12) are released from pushing, and the friction pad (21) pushed by the piston (12) toward the disc rotor (2) is released. Thus, by forming the push rod (17) with a magnet and forming the camshaft (7) and the piston (12) with a magnetic material, the camshaft (7) is returned to the piston (12) return side. During operation, the push rod (17) and the piston (12) can be forcibly restored to the original position by magnetic force simultaneously with the movement of the camshaft (7) to the original position, so that the friction pad (21) ( 22) Drag can be reduced.

  Further, due to the reaction force accompanying the movement of the piston (12) on the action part (3) side as described above, the caliper body (1) moves to the original position before the operation, and the reaction part (4) is restored to the original position. . In addition, the piston (12) and the reaction part (4) on the action part (3) side are restored to their original positions in this way, and at the same time, the friction pads (21) on the action part (3) side and the reaction part (4) side are restored. (22) is forcibly restored to its original position by the urging force of the return spring (24). Thus, since the pair of friction pads (21) (22) is forcibly returned to the original position before the operation by the urging force of the return spring (24), both the friction pads (21) (22) and the disc rotor ( 2), a mechanical disc brake can be reliably released without causing dragging.

  Next, position adjustment of the friction pads (21) and (22) when the linings (40) and (41) of the friction pads (21) and (22) are worn due to use for a certain period of time will be described. First, in a state where the linings (40) and (41) of the friction pads (21) and (22) are not worn, when the pair of friction pads (21) and (22) are brought into pressure contact with the disk rotor (2), the rotation is performed. The rotating arm (10) is positioned so that the protrusion (37) of the moving arm (10) contacts the stopper (38) of the caliper body (1).

  When the lining (40) (41) of the friction pad (21) (22) is worn due to use, the distance between the friction pad (21) (22) and the disc rotor (2) compared to before the wear. Spread. Therefore, when the lining (40) (41) wears out, it is necessary to return the space between the friction pads (21) (22) and the disk rotor (2) to the state before the lining (40) (41) wear. Therefore, the friction pads (21) and (22) must be moved to the disk rotor (2) side.

  The movement of the friction pads (21) and (22) toward the disc rotor (2) will be described below. First, the nut (20) screwed and fastened to the camshaft (7) is loosened and the rotating arm (10) is moved. The camshaft (7) is manually rotated in the brake braking direction while keeping the protrusion (37) in contact with the stopper (38) of the caliper body (1). Thereby, since the push rod (17) and the piston (12) slide toward the disk rotor (2), the friction pad (21) on the acting portion (3) side is moved by the piston (12) to the disk rotor (2). Pressed to the side. Further, due to the reaction force accompanying the movement of the friction pad (21) on the side of the action part (3), the caliper body (1) moves in the direction opposite to the movement direction of the piston (12), and the reaction part (4) The friction pad (22) on the side is pressed toward the disk rotor (2).

  As a result, the pair of friction pads (21) and (22) are pressed against both sides of the disk rotor (2), so that the distance between the friction pads (21) and (22) and the disk rotor (2) is the lining (40) ( It will be in the state returned to the state before wear of 41). Then, the nut (20) is screwed and fastened to the camshaft (7) to fix the position of the friction pads (21) and (22).

  As described above, it is easy to adjust the position of the friction pads (21) and (22) with the simple structure of screwing and fixing the rotating arm (10) and nut (20) to the camshaft (7) with the double nut structure. Can be done. In addition, since the friction pads (21) and (22) can be appropriately adjusted by manually rotating the camshaft (7), it is continuously variable depending on the degree of wear of the linings (40) and (41). Can be adjusted, and the degree of freedom during adjustment can be improved.

DESCRIPTION OF SYMBOLS 1 Caliper body 2 Disc rotor 7 Cam shaft 8 Cam shaft insertion hole 10 Rotating arm 11 Cylinder hole 12 Piston 17 Push rod 20 Nut 21, 22 Friction pad

Claims (1)

The caliper body includes a cylinder hole through which the piston slides and a camshaft insertion hole through which the camshaft is inserted.
A mechanical type in which the push rod pushes the piston by the rotation of the rotating arm connected to the cam shaft and operates the cam shaft by pulling the connecting means, and the friction pad is slidably contacted with the disk rotor by the advance of the piston. In the disc brake,
The pivot arm is screwed to the camshaft;
A mechanical disc brake, wherein the rotating arm and the nut are screwed and fixed to the camshaft in a double nut configuration.