JP2002089598A - Disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake device capable of enhancing impact and vibration resistance. SOLUTION: A non-reversible speed-reducing actuator 14 includes a motor 17, a worm 18, a worm wheel 19, and a first and a second gears 20 and 21, with the motor 17 disposed on one side across the axis L2 of a caliper 11 and the worm 18, the worm wheel 19 and the first gear 20 disposed on the other side across the axis L2 of the caliper 11. The axis L1 of braking of both brake pads 12 and 13 with respect to a disc rotor 30 is located on the same line as the axis L2 of the caliper 11. That is, the actuator 14 is disposed so that its center of gravity is located on the axis L1 of braking of both brake pads 12 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake device and, more particularly, to an arrangement of a drive source (actuator) for the disk brake device.

[0002]

2. Description of the Related Art As a vehicle brake device, there is well known a disk brake device that applies a brake by sandwiching a brake pad driven by a drive source (actuator) from both sides of a disk rotor that rotates with an axle.
This type of disc brake device is disclosed in, for example,
As disclosed in Japanese Patent No. 44596 and JP-A-11-147458, power from a motor is transmitted to a brake pad by an irreversible speed reduction mechanism (worm gear and worm wheel). That is, the rotational motion of the motor decelerated by the speed reduction mechanism is converted to linear motion, and the linear motion causes the brake pad to linearly move, thereby pinching the disk rotor.

FIG. 3 is a plan view showing an example of a conventional disk brake device, and FIG. 4 is a sectional view taken along line BB in FIG. As shown in FIGS. 3 and 4, the conventional disk brake device 50 includes a sliding caliper 51, a transmission (reduction mechanism) 52, and a motor 53.

As shown in FIG. 4, the transmission 52 includes a worm 54 fixed to a rotating shaft of a motor 53 and a worm wheel 55 meshing with the worm 54. A male screw 56 a is formed at the tip of the rotation shaft 56 of the worm wheel 55. A sleeve 57 having a female screw 57a is screwed to the male screw 56a. The tip of the sleeve 57 is in contact with a piston 59 that presses the brake pad 58.

During braking, the rotational movement of the motor 53 is transmitted through the worm 54, the worm wheel 55, the male screw 56a and the female screw 57a to the sleeve 57, ie, the piston 5
The linear motion of the brake pad 9 is converted into the linear motion of 9, and the brake pad 58 pressed by the piston 59 sandwiches the disk rotor 61 together with the other brake pad 60.

[0006]

As shown in FIG. 3, in the conventional disk brake device 50, the center of gravity K of the motor 53 is set at the center axis of the sliding caliper 51 (that is, the two brake pads 58 and 60). (The braking center axis line) L0. When an impact load due to running vibration or braking reaction force is applied to the sliding caliper 51 during running and braking of the vehicle, a large bending is caused at the base of the motor 53 with respect to the sliding caliper 51 due to the weight and length of the motor 53. A moment is generated. As a result, there is a possibility that a problem may occur at the base of the motor 53 depending on the magnitude of the bending moment. That is, the conventional disc brake device 50 has a problem that the shock resistance and the vibration resistance are weak.

[0007] The present invention has been made to solve the above problems, and an object of the present invention is to provide a disc brake device capable of improving shock resistance and vibration resistance.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention provides a disk brake device main body that straddles a rotating disk rotor, and a fixed brake fixed to the disk brake device main body. A pad, a movable brake pad for sandwiching the disk rotor together with the fixed brake pad, a linear motion member movably mounted in the disk brake device main body, and having the movable brake pad fixed to a tip end thereof; A drive source for driving the linear motion member along the axis of the braking center axis of both brake pads with respect to the disk rotor, wherein the drive source has a center of gravity of the brake pads. The gist is that it is arranged so as to be close to or on the braking center axis of .

According to a second aspect of the present invention, in the disk brake device according to the first aspect, the driving source includes a motor, a worm fixed to a rotating shaft of the motor, and a worm wheel meshing with the worm. A first power transmission member interlocking with the worm wheel; and a second power transmission member interlocking with the linear motion member while transmitting rotation of the first power transmission member. The worm, worm wheel, and first power transmission member are:
The gist is that the brake pads are disposed on both sides of the braking center axis with respect to the braking center axis.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
The gist of the present invention is that the braking center axes of the two brake pads are located on the same line as the center axis of the disc brake body.

(Operation) According to the first aspect of the present invention,
When both brake pads clamp the disk rotor to apply braking, the reaction force applied to the drive source in the axial direction of the braking center of both brake pads acts on the center of gravity of the drive source. As a result, the drive source is less likely to sway with respect to the disk brake device main body. Further, the shock resistance and vibration resistance of the disc brake device of the present invention can be improved as compared with the related art in which the center of gravity of the drive source is shifted from the braking center axis of both brake pads.

According to the invention described in claim 2, according to claim 1,
In addition to the operation of the invention described in the above, the center of gravity of the drive source can be easily arranged on the braking center axis of both brake pads by disposing the motor, worm, worm wheel, first power transmission member, etc. constituting the drive source. Can be done.

According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the inventions described in (1) and (2), the braking center axes of both brake pads are located on the same line as the center axis of the disc brake device body. Therefore, by arranging the center of gravity of the drive source on the center axis of the disc brake device main body, the center of gravity of the drive source can be arranged on the brake center axis of both brake pads. As a result, the shock resistance and vibration resistance of the disc brake device can be easily improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the disc brake device of the present embodiment. FIG. 2 is a cross-sectional view of a main part of the disk brake device of the present embodiment taken along line AA in FIG.

[0015] The disc brake device 10 of the present embodiment.
As shown in FIG. 1, the apparatus includes a caliper 11 as a disc brake device main body, a fixed brake pad 12, a movable brake pad 13, and an irreversible deceleration actuator 14 as a drive source.

The caliper 11 includes a cylinder portion 11a fixed to a non-rotating body (not shown) of the vehicle body, a connecting portion 11b straddling a disk rotor 30 linked to an axle, and a claw portion 11c fixing the fixed brake pad 12. And
A piston sliding part 11d is formed in the cylinder part 11a. In the piston sliding portion 11d, a piston 16 as a direct-acting member is arranged so as to be non-rotatable and axially movable with respect to the piston sliding portion 11d. The piston 16 is provided with a screw hole 16b extending from the base end face 16a along the central axis of the piston 16.
The movable brake pad 13 is fixed to a distal end surface 16c of the piston 16. In the present embodiment, as shown in FIG. 1, the braking center axis of the disc brake device 10 (that is, both brake pads 12,
The center axis of the caliper 11 (that is, the center axis of the piston 16) L2 is located on the same line with respect to the center axis L1 of the brake 13). The two brake pads 1
The braking center axes L1 and L2 indicate the axes passing through the centers of the braking forces applied from the brake pads 12 and 13 to the disk rotor 30.

The irreversible deceleration actuator 14 is shown in FIG.
And a motor 17 and a worm 18 as shown in FIG.
, A worm wheel 19, a first gear 20 as a first power transmission member, and a second gear 21 as a second power transmission member.

The motor 17 has a worm 18 fixed to a rotating shaft 17a. A worm wheel 19 is meshed with the worm 18. The first gear 20 is formed to have a smaller diameter than the worm wheel 19, and is fixed on the same rotation shaft 22 as the worm wheel 19.
The first gear 20 is meshed with a second gear 21 having a diameter larger than that of the first gear 20. The second gear 21 is provided with a screw shaft portion 21a screwed with the screw hole 16b of the piston 16. Further, the first and second gears 20 and 21 are non-movably and rotatably accommodated in a holding member 23 connected to the cylinder portion 11a of the caliper 11 in a state of being meshed with each other. In the present embodiment, the motor 17 has a motor body 17 b attached to a side surface of the holding member 23 by a bracket 24.

In the present embodiment, the irreversible deceleration actuator 14 is provided such that its center of gravity is the center axis L of the caliper 11.
2 (that is, the braking center axis L1 of both brake pads 12 and 13). In other words, the center of gravity of the irreversible deceleration actuator 14 is aligned with the center axis L2 of the caliper 11 (that is, both brake pads 1).
The motor 17 is disposed on one side (left side in FIGS. 1 and 2) with respect to the center axis L2 of the caliper 11 so as to be located on the braking center axis L1) of the caliper 11 and the worm wheel 19. The first gear 20 is disposed on the other side (the right side in FIGS. 1 and 2) with respect to the center axis L2 of the caliper 11.

When the motor 17 rotates during braking (or when braking is released), the rotation is transmitted to the second gear 21 via the worm 18, the worm wheel 19 and the first gear 20. When the screw shaft portion 21a rotates together with the rotation of the second gear 21, the rotational motion is converted into linear motion of the piston 16 by the screw hole 16b, and the piston 16 is moved along its central axis (that is, the caliper 11).
Along the center axis L2) of the piston sliding portion 11d. By the movement of the piston 16, the brake pads 12 and 13 are moved to the disk rotor 3.
It is driven so as to pinch (or separate) from zero.

Hereinafter, features of the disc brake device 10 of the present embodiment will be described. (1) In the present embodiment, the irreversible deceleration actuator 1
4 is arranged so that its center of gravity is located on the braking center axis L1 of both brake pads 12, 13.

Accordingly, when the brake pads 12, 13 clamp the disc rotor 30 and apply a brake, the reaction force applied to the irreversible deceleration actuator 14 in the axial direction of the braking center axis L1 of the brake pads 12, 13 is:
It acts on the center of gravity of the irreversible deceleration actuator 14. As a result, the irreversible deceleration actuator 14 is less likely to swing with respect to the caliper 11. And, compared with the conventional technology in which the center of gravity of the drive source is shifted from the braking center axis of both brake pads, the disc brake device 10
Impact resistance and vibration resistance can be improved.

(2) In the present embodiment, the irreversible deceleration actuator 14 comprises a motor 17, a worm 18, a worm wheel 19, first and second gears 20, 21.
And the motor 17 is connected to the brake pads 12, 1
3 and the worm 18, the worm wheel 19, and the first gear 20 are arranged on the other side with respect to the braking center axis L1 of the brake pads 12, 13.

Therefore, the irreversible deceleration actuator 14
The center of gravity of the irreversible deceleration actuator 14 can be easily adjusted by the arrangement of members constituting the two brake pads 12 and 13.
On the braking center axis L1.

(3) In the present embodiment, the motor 17 has a motor
It is attached to the side surface of the holding member 23 integrated with the holding member 23. Therefore, the swing of the motor 17 constituting the irreversible deceleration actuator 14 is limited by the bracket 24, and the shock resistance and vibration resistance of the disc brake device 10 can be further improved.

(4) In this embodiment, the disk rotor 3
The center axis L1 of braking of both brake pads 12, 13 with respect to 0 is located on the same line as the center axis L2 of the caliper 11.

Therefore, the irreversible deceleration actuator 14
Is arranged on the center axis L2 of the caliper 11, so that the center of gravity of the irreversible deceleration actuator 14 is adjusted to the center axis L1 of the brake pads 12, 13.
Can be placed on top. As a result, the shock resistance and vibration resistance of the disc brake device 10 can be easily improved.

The embodiment of the present invention is not limited to the above embodiment, but may be modified as follows. In the above embodiment, the drive source is implemented by the irreversible deceleration actuator 14, but the drive source may be implemented by an actuator other than the irreversible deceleration actuator, for example, a reversible deceleration actuator. In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

In the above embodiment, the first power transmission member and the second power transmission member are provided with a pair of first
And the second power transmission member, the first power transmission member and the second power transmission member are not limited to the gears. May be carried out by a chain or a belt. In this case, effects similar to the effects described in the features (1) to (4) of the above embodiment can be obtained.

In the above embodiment, the irreversible deceleration actuator 14 is arranged such that its center of gravity is located on the center axis L2 of the caliper 11 (that is, the braking center axis L1 of the brake pads 12, 13). But
The center of gravity of the irreversible deceleration actuator 14 is set at the center axis L2 of the caliper 11 (that is, both brake pads 1).
2 and 13 may be arranged so as to be close to the braking center axis L1). In this case, substantially the same effects as those described in the features (1) to (4) of the above embodiment can be obtained.

[0031]

According to the first aspect of the present invention, the shock resistance and vibration resistance of the disc brake device can be improved.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the center of gravity of the drive source can be easily arranged on the braking center axis of both brake pads.

According to the invention described in claim 3, according to claim 1
In addition to the effects of the inventions described in (1) and (2), the impact resistance and the vibration resistance of the disc brake device can be easily improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a disc brake device according to an embodiment.

FIG. 2 is a sectional view of a main part of the disk brake device.

FIG. 3 is a plan view of a conventional disc brake device.

FIG. 4 is a view B of FIG.
-B line sectional drawing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Disc brake device, 11 ... Caliper as a disc brake device main body, 12 ... Fixed brake pad, 13 ... Moving brake pad, 14 ... Irreversible deceleration actuator as a drive source, 16 ... Piston as a linear member, 17 ... Motor, 17a rotating shaft, 18 worm, 19 worm wheel, 20 first gear as first power transmission member, 21 second gear as second power transmission member, 30 disk rotor , L1... The central axis of the brake pads 12, 13 and L2... The central axis of the caliper 11.

Claims (3)

[Claims] 1. A disk brake device main body (11) straddling a rotating disk rotor (30), a fixed brake pad (12) fixed to the disk brake device main body (11), and the fixed brake pad (12). And a movable brake pad (13) for sandwiching the disk rotor (30), and a movable brake pad (1) attached to the disk brake device body (11) movably.
3) a linear moving member (16) to which the fixing is fixed, and the linear moving member (16) is moved along the axial direction of the braking center axis (L1) of both brake pads (12, 13) with respect to the disk rotor (30). And a drive source (14) that drives the drive source (14) so that the center of gravity of the drive source (14) approaches or brakes the braking center axis (L1) of the brake pads (12, 13). A disc brake device characterized by being arranged so as to be located on a center axis (L1). 2. The disk brake device according to claim 1, wherein the drive source (14) includes a motor (17) and a worm (1) fixed to a rotation shaft (17a) of the motor (17).
8), a worm wheel (19) meshing with the worm (18), a first power transmission member (20) interlocked with the worm wheel (19), and rotation of the first power transmission member (20). And the linear motion member (1).
6) and a second power transmission member (21) interlocked with the worm (18), the worm wheel (19), and the first power transmission member (20). A disc brake device, which is disposed on both sides of the braking center axis (L1) with respect to the braking center axis (L1) of the brake pads (12, 13). 3. The disc brake device according to claim 1, wherein a center axis (L1) of the brake pads (12, 13) is aligned with a center axis (L2) of the main body (11) of the disc brake device. A disc brake device characterized by being located on the same line as the above.