JP4051650B2 - Electric disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembly property of a ball lamp mechanism, as well as to improve the rigidity of a thrust transmitting passage. SOLUTION: A ball lamp mechanism 27 is installed at the inner side of the flange part 10 of an about C-shape claw part 4 striding over a disk rotor 2, an electric motor 12 is installed at the outer side, and the movable disk 33 of the ball lamp mechanism 27 and the rotor 15 of an electric motor 12 are spline connected. The rotation of a rotor 15 is converted into a linear movement by the ball lamp mechanism 27, and brake pads 6 and 7 are pressed to a disk rotor 2 by moving a piston 28. Since the thrust of the ball lamp mechanism 27 is transmitted directly to the brake pads 6 an 7 by the about C-shape claw part 4, the rigidity of a thrust transmission passage can be improved. And since a ball lamp unit 14 is formed by integrally forming the fixing disk 32, the movable disk 33, and the ball 34, of the ball lamp mechanism 27 by a case 54, those members can be assembled to a caliper main body 3 easily.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric disc brake device that generates a braking force by a rotational force of an electric motor.
[0002]
[Prior art]
For example, as a braking device for a vehicle such as an automobile, a so-called “dry brake” device that does not use brake fluid and generates a braking force by the output of an electric motor is known.
[0003]
As a dry brake device, for example, as disclosed in JP-A-60-206766, the rotational motion of an electric motor is converted into the forward and backward movement of a piston by a ball screw mechanism, and the brake pad is pressed against the disc rotor by the piston. Thus, there is an electric disc brake device that generates a braking force. In this type of electric disk brake device, a brake pedal depression force (or displacement amount) by a driver is detected by a sensor, and a controller controls rotation of the electric motor in response to the detection to obtain a desired braking force. I have to.
[0004]
In the electric disc brake device as described above, various sensors are used to detect vehicle conditions such as the rotational speed of each wheel, vehicle speed, vehicle acceleration, steering angle, vehicle lateral acceleration, etc., and these are detected by the controller. By controlling the rotation of the electric motor based on the above, boost control, anti-lock control, traction control, vehicle stabilization control, and the like can be incorporated relatively easily.
[0005]
[Problems to be solved by the invention]
Generally, in the electric disc brake as described above, due to restrictions on the installation space of the ball screw mechanism, the motor, etc., one brake pad is pressed against the disc rotor, and the caliper is moved by the reaction force to move the other brake. A caliper floating type structure is employed in which the pad is pressed against the disk rotor. For this reason, it is necessary to increase the rigidity of the thrust transmission path from the thrust generating mechanism to the claw portion. Further, since a power transmission mechanism such as a ball screw mechanism and an electric motor are incorporated into the caliper body, it is necessary to sufficiently consider these assembling properties.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide an electric disc brake that can increase the rigidity of a thrust transmission path and is excellent in assembling.
[0007]
[Means for Solving the Problems]
  In order to solve the above problems, the invention of claim 1 includes a pair of brake pads disposed on both sides of a disk rotor, a piston provided in a caliper body so as to face one of the pair of brake pads, In the caliper bodyBefore being establishedA claw portion opposed to the other of the pair of brake pads, an electric motor provided in the caliper body, and a mechanism for converting the rotational movement of the rotor of the electric motor into a linear movement to move the piston forward and backward. The electric disc brake includes a pair of discs and a ball interposed therebetween, and is unitized with the ball interposed between the pair of discs. Ball lamp mechanismThe ball ramp mechanism and the rotor of the electric motor have spline coupling portions that are spline coupled to each other in the axial direction of the rotor, and the unitized ball ramp mechanism and the rotor of the electric motor Can be assembled and assembled by the spline coupling part.It is characterized by that.
  An electric disc brake according to a second aspect of the present invention includes the ball ramp mechanism in addition to the configuration of the first aspect.SaidA pair of discsWiththeseA pair of disksAnd the ball interposed betweenA pair ofCover the outer periphery of the discThe spline joint formed on one of the pair of disks is exposed.Integrated ball lamp unit housed in a caseThe spline coupling portion exposed from the ball lamp unit is spline coupled to the spline coupling portion of the rotor of the electric motor.It is characterized by being assembled.
[0008]
With this configuration, when the rotor is rotated by the electric motor, the movable disk of the ball ramp mechanism moves the piston, presses one of the brake pads against the disk rotor, and the reaction force causes the claw to move to the other brake. A braking force is generated by pressing the pad against the disk rotor. Further, since the fixed disk, the movable disk and the ball of the ball ramp mechanism are housed in a case and integrated into a ball lamp unit, these can be easily assembled to the caliper body.
[0009]
  The invention of claim 3A caliper body, a pair of brake pads disposed on both sides of the disc rotor, a piston provided in the caliper body so as to oppose and press one of the pair of brake pads, and provided in the caliper body A claw portion opposed to the other of the pair of brake pads, an electric motor having a rotor provided in the caliper body, and transmission for converting the rotational motion of the rotor of the electric motor into a linear motion to move the piston forward and backward. An electric disc brake including a mechanism, wherein the transmission mechanism for converting rotational motion into linear motion is sub-assembled and integrated, and the transmission mechanism and the rotor of the electric motor slide in the axial direction of the rotor. A spline coupling portion that is movably spline coupled, and the transmission mechanism integrated with the sub-assembly and the electric And a motor rotor, characterized in that to enable the assembly attached by the spline coupling portion.
[0010]
  With this configuration,When the rotor is rotated by the electric motor, the transmission mechanism moves the piston and presses one brake pad against the disk rotor, and the reaction force causes the pawl to press the other brake pad against the disk rotor, generating braking force. Let By assembling the transmission mechanism integrally, the caliper body can be easily assembled. Moreover, by attaching the transmission mechanism to the inside of the claw part, the thrust is directly transmitted to both brake pads via the claw part.be able to.
[0011]
  According to a fourth aspect of the present invention, there is provided a pair of brake pads disposed on both sides of the disc rotor, a piston provided on the caliper body so as to face one of the pair of brake pads, and the caliper body.ProvidedA claw portion facing the other of the pair of brake pads, and provided on the caliper body.With rotorElectric disc brake comprising: an electric motor; and a transmission mechanism for converting the rotary motion of the rotor of the electric motor into a linear motion to move the piston forward and backwardIn the manufacturing method, a step of preparing an electric motor having a spline coupling portion on the rotor, and a subassembly of the transmission mechanism having a spline coupling portion slidably coupled to the spline coupling portion of the rotor in an axial direction. And assembling the sub-assembled transmission mechanism and the electric motor so as to be coupled to each other by the spline coupling portion.
[0012]
  With this configuration,The electric disc brake can be easily assembled.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0014]
As shown in FIGS. 1 to 4, the electric disc brake 1 of the present embodiment has a caliper body 3 disposed on one side (usually inside the vehicle body) of a disc rotor 2 that rotates with wheels (not shown). The caliper body 3 is integrally connected with a claw portion 4 formed in a substantially C shape and extending to the opposite side across the disk rotor 2 by a bolt 5. Brake pads 6 and 7 are provided on both sides of the disc rotor 2, that is, between the disc rotor 2 and the caliper main body 3 and between the tip portions of the claw portions 4, respectively. The brake pads 6 and 7 are supported by a carrier 8 fixed to the vehicle body so as to be movable along the axial direction of the disk rotor 2 and receive braking torque by the carrier 8. Is guided so as to be slidable along the axial direction of the disk rotor 2 by a slide pin 9 attached to the carrier 8.
[0015]
An electric motor 12 and a rotation detector 13 are provided in a substantially cylindrical case 11 of the caliper main body 3 to which an annular flange portion 10 formed at the base of the claw portion 4 is coupled. The portion 4 is inserted into the rotor 15 of the electric motor 12 from the annular flange portion 10 side. A cover 16 is attached to the rear end portion of the case 11 with a bolt 17.
[0016]
The electric motor 12 is supported by the stator 18 fixed to the inner periphery of the case 11 and the case 11 so that it can be rotated by the slide bearings 19 and 20 while being opposed to the inner periphery of the stator 18 and is movable in the axial direction. Rotor 15 is provided. The rotation detector 13 includes a resolver stator 23 fixed to a resolver case 22 attached to the case 11 by bolts 21, and a resolver rotor 24 fixed to the rotor 15 so as to face the resolver stator 23, and relative to them. The rotational position of the rotor 15 is detected based on the rotation.
[0017]
The cover 16 is provided with a connector 25 and a cable 26 connected to the electric motor 12 and the rotation detector 13, and the electric motor 12 responds to a control signal (electric signal) from a controller (not shown). Thus, the rotor 15 can be rotated by a desired angle with a desired torque. The connector 25 and the cable 26 are inclined with respect to the axial direction of the disk rotor 2 and extend radially outward in order to avoid interference with members such as arms, links, knuckles, struts and the like of the suspension device of the vehicle. Has been.
[0018]
The ball ramp unit 14 includes a ball ramp mechanism 27 (transmission mechanism) that converts the rotational motion of the rotor 15 of the electric motor 12 into a linear motion, a piston 28 that presses the brake pad 6, and an adjustment that is interposed therebetween. A nut 29 and a limiter mechanism 30 (pad wear compensation mechanism) that transmits the rotation of the ball ramp mechanism 27 to the adjustment nut 29 are provided.
[0019]
The ball ramp mechanism 27 is in contact with the flange portion 10 of the claw portion 4 and is fixed so as not to rotate by a pin 31, a movable disk 33 disposed so as to face the fixed disk 32, and these And a ball 34 (steel ball) interposed therebetween. The movable disk 33 is integrally formed with a cylindrical portion 35 that is inserted into the fixed disk 32 and extends to the inside of the case 11. The cylindrical portion 35 is splined to the inner peripheral portion of the rotor 15, and these spline connecting portions 36 are moderate in the rotational direction and radial direction in consideration of axial slidability, dimensional tolerance, and assembly. Play is provided.
[0020]
Three ball grooves 37 and 38 extending in an arc shape along the circumferential direction are formed on the opposing surfaces of the fixed disk 32 and the movable disk 33, respectively. These ball grooves 37 and 38 are each extended at an equal central angle (for example, 90 °) and arranged at equal intervals. The ball grooves 37 and 38 are inclined in the same direction, and the ball 34 is inserted between the ball grooves 37 and 38, and the three balls 34 are moved into the ball groove 37 by the rotation of the movable disk 33 with respect to the fixed disk 32. 38, and the movable disk 33 moves in the axial direction in a direction away from the fixed disk 32 in accordance with the rotation angle.
[0021]
The adjustment nut 29 includes a cylindrical portion 39a and a flange portion 39b formed on the outer side of one end portion thereof. The cylindrical portion 39a is inserted into the cylindrical portion 35 of the movable disk 33 and is rotatably supported by the slide bearing 40. The portion 39b abuts on one end of the movable disk 33 and is rotatably supported by the thrust bearing 41. The cylindrical portion 39a of the adjustment nut 29 extends to the inside of the rotor 15 in the case 11, and the limiter mechanism 30 is mounted on the outer periphery of the tip portion.
[0022]
In the limiter mechanism 30, a limiter 42 and a spring holder 43 are rotatably fitted on the outer periphery of the tip end portion of the cylindrical portion 39a of the adjustment nut 29, and these are connected to each other by a coil spring 44. The limiter 42 and the spring holder 43 are engaged with each other so as to be relatively rotatable within a predetermined range, and a predetermined set load is applied to the rotation direction by the coil spring 44. The limiter 42 is attached to the spring holder 43. Thus, it can rotate clockwise against the set load of the coil spring 44 (clockwise as viewed from the left in FIG. 1, the same applies hereinafter). An engagement recess 45 formed in the limiter 42 is engaged with an engagement projection 46 formed at the end of the cylindrical portion 35 of the movable disk 33, and the limiter 42 is in a predetermined range with respect to the cylindrical portion 35. The relative rotation is possible with. Further, a clutch spring 47 (coil spring) is wound around the outer periphery of the tip of the cylindrical portion of the adjustment nut 29, and one end thereof is coupled to the spring holder 43. The clutch spring 47 has a diameter expanded by twisting. Further, it acts as a one-way clutch due to the reduced diameter, and transmits only the clockwise rotation of the spring holder 43 to the cylindrical portion 39a of the adjustment nut 29.
[0023]
  The piston 28 is screwed into a thread portion 48 (pad wear compensation mechanism) formed on the inner peripheral portion of the adjustment nut 29, and when the adjustment nut 29 rotates clockwise with respect to the piston 28, the piston 28 moves toward the brake pad 6 side. To move forward. An anti-rotation rod 50 having one end fixed to the resolver case 22 by a nut 49 is inserted into the cylindrical portion 39a of the adjustment nut 29, and the other end of the anti-rotation rod 50 is slidable in the axial direction with respect to the piston 28. And is engaged so as to restrict rotation. A small-diameter portion 28C having a groove 28B forming a two-chamfered portion 28A is formed at the rear end portion of the piston 28 (see FIGS. 8 and 9). A non-rotating cap 28b (see FIGS. 10 and 11) having a claw portion 28a that engages with the groove 28B is fitted to the small diameter portion 28C from the side of the small diameter portion 28C along the groove 28B. Installed. Then, a chamfered portion 50a formed at the other end of the detent rod 50 is inserted and fitted into a chamfered hole 28c having the same diameter as the inner diameter of the piston 28 formed in the detent cap 28b. In addition to restricting relative rotation between the non-rotating rod 50 and the piston 28,Axial directionRelative movement is possible. A plurality of disc springs are provided between a flange portion 51 formed at an intermediate portion of the rotation preventing rod 50 (a base end portion of the two-chamfered portion 50a) and a flange portion 52 formed within the cylindrical portion 39a of the adjustment nut 29. 53 is interposed, and the adjusting nut 29 is urged to the right in FIG. 13 by the spring force. The urging force (the set load of the disc spring 53) to the adjustment nut 29 can be adjusted by moving the axial position of the detent rod 50 with the nut 49.
[0024]
A substantially cylindrical case 54 is attached to the fixed disk 32, the movable disk 33, and the adjustment nut 29 of the ball ramp mechanism 27 so as to cover the outer periphery of these flange portions. In the case 54, a flange portion 55 is formed inside the tapered tip portion, and an engaging claw 56 having a notch is formed inside the cylindrical rear end portion. Then, the fixed disk 32 is engaged with the engaging claw 56, and a wave washer 57 is interposed between the flange portion 55 and the flange portion 39b of the adjustment nut 29, so that the fixed disk 32, the movable disk 33 and the ball 34 are attached. The movable disk and the adjustment nut 29 are allowed to move in the axial direction by the elasticity of the wave washer 57, and an appropriate resistance is given to the rotation of the adjustment nut. The tip of the piston boot 58 attached to the flange portion 55 is coupled to the outer periphery of the tip of the piston 28 attached to the adjustment nut 29. The cylindrical portion of the case 54 is fitted into the claw portion 4 and the space therebetween is sealed with an O-ring 59. In the figure, reference numeral 60 denotes a pin boot.
[0025]
Next, the operation of the present embodiment configured as described above will be described.
[0026]
During braking, when the rotor 15 of the electric motor 12 rotates clockwise with a predetermined torque in response to a signal from a controller (not shown), the movable disk 33 of the ball ramp mechanism 27 rotates via the spline coupling portion 36. Then, the ball 34 rolls along the ball grooves 37 and 38 to advance the movable disk 33 toward the brake pad 6 along the axial direction. This thrust is transmitted to the adjusting nut 29 via the thrust bearing 41, and further transmitted to the piston 28 via the threaded portion 48. One brake pad 6 is pressed against the disc rotor 2, and the reaction force causes the caliper body. 3 moves along the slide pin 9 of the carrier 8, and the claw portion 4 presses the other brake pad 7 against the disc rotor 2, and a braking force is generated according to the torque of the electric motor 12.
[0027]
At this time, by reducing the inclination of the ball grooves 37 and 38 of the ball ramp mechanism 27, the lead against rotational displacement can be set sufficiently small, so that the boost ratio can be increased and the output of the electric motor 12 can be increased. Therefore, the power consumption can be reduced and the motor can be downsized. Further, by arranging the three ball grooves 37, 38 at equal intervals along the circumferential direction in each of the fixed disk 32 and the movable disk 33, the thrust is evenly transmitted between them, so that the moment load is reduced. Without being generated, the brake pads 6 and 7 can be pressed evenly, and a stable braking force can be obtained. As a result, the moment load acting on the support portions of the fixed disk 32 and the movable disk 78 can be reduced, and the required strength can be reduced, so that each part can be reduced in size and weight.
[0028]
Further, a ball ramp mechanism 27 for driving the brake pads 5 and 6 on both sides of the disc rotor 2 is disposed adjacent to the disc rotor 2 and fixed inside the substantially C-shaped claw portion 4, and the outside is electrically driven. By disposing the motor 12, the distance between the ball ramp mechanism 27 and the brake pads 5 and 6 can be sufficiently reduced, and the thrust can be directly transmitted by the claw portion 4. As a result, the case 11 of the electric motor 12 does not directly receive the load during braking, so that the case 11 can be made thinner and lighter materials can be used, and the weight reduction and heat dissipation of the electric motor 12 can be promoted. it can. Further, since the reaction force during braking does not directly act on the bearing portion of the rotor 15, the structure of the bearing portion of the electric motor 12 can be simplified.
[0029]
When releasing the brake, when the electric motor 12 is rotated in the reverse direction and the movable disk 33 is rotated counterclockwise to the original position, the movable disk 33, the adjusting nut 29 and the piston 28 are retracted by the spring force of the disc spring 53, and the caliper The main body 3 moves along the slide pin 9 so that the brake pads 6 and 7 are separated from the disc rotor 2 and the braking is released.
[0030]
Next, compensation for wear of the brake pads 6 and 7 will be described with reference to FIGS. Since the relative positional relationship between the piston 28 and the brake pad 6 and between the claw portion 4 and the brake pad 7 is the same, only the relationship between the piston 28 and the brake pad 6 is shown in FIGS.
[0031]
When the brake pad 6 is not worn or after the adjustment of wear described later is performed, the piston 28 is set from the non-braking position (A) by the rotation of the rotor 15 during braking, as shown in FIG. When the brake pad 6 moves forward by the pad clearance C and moves to the braking start position (B) where the brake pad 6 contacts the disk rotor 2, the engagement protrusion 46 of the cylindrical portion 35 of the movable disk 33 extends along the engagement recess 45 of the limiter 42. And rotate to move from one end of the engaging recess 45 to the other end. Further, when the piston 28 presses the brake pad 6 against the disc rotor 2 and moves to the braking position (D), the engaging convex portion 46 rotates the limiter 42 clockwise, and the rotational force is applied to the coil spring 44 and the clutch spring. It is transmitted to the adjusting nut 29 via 47. At this time, since the piston 28 presses the brake pad 5 and a large frictional force is generated in the screw portion 48 between the piston 28 and the adjustment nut 29, the coil spring 44 is bent and the adjustment nut 29 does not rotate. . When the piston 28 moves backward to the non-braking position (A) due to the reverse rotation of the movable disk 33 when the brake is released, the engaging convex portion 46 comes into contact with one end portion of the engaging concave portion 45 and the limiter 62 and the spring holder 43 Is rotated counterclockwise, but the piston 28 does not rotate because the clutch spring 47 expands in diameter and idles. In this way, pad wear is not adjusted and a constant pad clearance is maintained.
[0032]
When the brake pad 6 is worn, as shown in FIG. 6, during braking, the brake pad 6 is moved to the position (B) corresponding to the set pad clearance C from the non-braking position (A) by the clockwise rotation of the rotor 15. The piston 28 does not press the brake pad 6 due to the wear W even if the engagement protrusion 46 moves from one end to the other end of the engagement recess 45. When the rotor 15 further rotates, the movable disk 33 and the adjusting nut 29 are advanced to the position (D) toward the disk rotor 2 and the piston 28 brings the brake pad 6 into contact with the disk rotor 2. At this time, the engaging convex portion 46 rotates the limiter 42 clockwise, and the rotational force is transmitted to the adjustment nut 29 via the coil spring 44 and the clutch spring 47, but the piston 28 presses the brake pad 6. Since no large frictional force is generated in the threaded portion 48 between the piston 28 and the adjusting nut 29, the adjusting nut 29 rotates clockwise to further advance the piston 28 toward the brake pad 6 side. Adjust the wear. When the piston 28 moves to the position (E) where the brake pad 6 is pressed against the disk rotor 2, a large frictional force is generated in the thread portion 48 between the piston 28 and the adjusting nut 29, and the coil spring 44 is The adjustment nut 29 stops rotating due to the bending. When the brake is released, when the piston 28 is retracted to the non-braking position (A) due to the counterclockwise rotation of the rotor 15, the engaging convex portion 46 comes into contact with one end portion of the engaging concave portion 45 and the limiter 42 is counterclockwise. However, the adjustment nut 29 does not rotate because the clutch spring 47 expands in diameter and idles. In this way, the gap W between the brake pad 6 and the piston 28 at the non-braking position caused by wear is reduced to W ', and only a certain percentage of the wear of the brake pad 6 can be operated once. The piston 28 can be advanced from the adjustment nut 29 to the brake pad 6 side, and by repeating this, the wear of the brake pads 6 and 7 can be adjusted.
[0033]
Next, assembly of the electric disc brake 1 will be described with reference to FIG.
[0034]
As shown in FIG. 7A, the ball ramp mechanism 27, the adjusting nut 29, the piston 28, the non-rotating rod 50, the disc spring 53, the wave washer 57, and the piston boot 58 are assembled together by the case 54, and the adjusting nut 29 The limiter mechanism 30 is assembled to the cylindrical portion 39a, the ball lamp unit 14 is sub-assembled, the ball lamp unit 14 is inserted into the flange portion 40 of the claw portion 4, and the opening / closing mechanism portion 61 (see FIG. 7B) is provided. Constitute. As shown in FIG. 7B, the electric motor 12 and the rotation detection mechanism 13 are assembled to the case 11 and the cover 16 to constitute a motor mechanism 62, and the cylindrical portion 35 of the movable disk 33 and the rotor of the electric motor 12 are configured. An electric caliper 63 (see FIG. 7 (c)) is constructed by connecting 15 spline connecting portions 36, screwing a nut 49 to the rotation preventing rod 50, and assembling the opening / closing mechanism portion 61 and the motor mechanism portion 62. To do. The electric disc brake 1 can be assembled by mounting the electric caliper 63 on the carrier 8 that supports the brake pads 6 and 7.
[0035]
Thus, the electric disc brake 1 can be easily assembled by connecting the sub-assembled opening / closing mechanism 61 (ball lamp unit 14, claw 4) and the motor mechanism 62. At this time, since a suitable play is provided in the spline coupling portion 36 between the movable disk 33 and the rotor 15 of the electric motor 12, dimensional tolerance can be absorbed, and assembly and disassembly of these can be easily performed. it can. Further, the play of the spline coupling part 36 can absorb the vibration of the movable disk 33, and the load on the sliding bearings 19 and 20 of the rotor 15 can be reduced. Further, by elastically supporting the case 54 via the O-ring 59, the shock from the brake pads 6 and 7 can be absorbed by the O-ring 59.
[0036]
【The invention's effect】
  As detailed above,According to the electric disc brake of the first aspect, since the ball ramp mechanism is unitized with the ball interposed between a pair of discs, these can be easily assembled to the caliper body, The assembly of the disc brake can be improved.
  Also,Claim2According to the electric disk brake, the fixed disk, the movable disk and the ball of the ball ramp mechanism are accommodated in a case and integrated into a ball lamp unit, so that these can be easily assembled to the caliper body. The assembly of the brake can be improved.
[0037]
  According to the electric disk brake of claim 3,Since the transmission mechanism is integrally sub-assembled, the transmission mechanism can be easily assembled to the caliper body, and the assembly performance of the electric disc brake can be improved. In addition, by attaching the transmission mechanism to the inside of the claw part, the thrust can be transmitted directly to both brake pads via the claw part, so that the rigidity of the thrust transmission path can be increased, and the thin case It is possible to reduce the weight and use a lightweight material, and to promote weight reduction and heat dissipation of the electric motor.
[0038]
  Further, according to the electric disk brake of the fourth aspect, since the transmission mechanism is integrally sub-assembled, the electric disk brake can be easily assembled to the caliper body, and the assemblability of the electric disk brake can be improved..
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an electric disc brake according to an embodiment of the present invention.
FIG. 2 is a side view showing the apparatus of FIG.
FIG. 3 is a plan view showing the apparatus of FIG.
4 is a front view showing the apparatus of FIG. 1 with a part broken away. FIG.
FIG. 5 is an explanatory diagram showing an operation when the pad wear compensation mechanism pad of the apparatus of FIG. 1 is not worn.
6 is an explanatory view showing an operation when the pad of the pad wear compensation mechanism of the apparatus of FIG. 1 is worn. FIG.
7 is an explanatory view showing an assembly process of the apparatus of FIG. 1; FIG.
FIG. 8 is a longitudinal sectional view of a rear end portion of a piston of the apparatus of FIG. 1;
9 is a longitudinal sectional view taken along line AA in FIG.
10 is a side view of the detent cap of the apparatus of FIG. 1. FIG.
11 is a front view of a detent cap of the apparatus of FIG. 1. FIG.
[Explanation of symbols]
1 Electric disc brake
2 Disc rotor
3 Caliper body
4 nails
6,7 Brake pads
12 Electric motor
14 Ball lamp unit
15 Rotor
27 Ball ramp mechanism (transmission mechanism)
28 piston
30 Limiter mechanism (pad wear compensation mechanism)
32 Fixed disk
33 Movable disc
34 balls
48 Screw part (pad wear compensation mechanism)
54 cases

Claims (4)

Facing the pair of brake pads disposed on opposite sides of the disc rotor, a piston provided in the caliper body so as to face one of the pair of brake pads, the other prior Symbol pair of brake pads provided in the caliper body An electric disc brake comprising: a claw portion for performing the above operation; an electric motor provided in the caliper body; and a mechanism for converting the rotary motion of the rotor of the electric motor into a linear motion to move the piston forward and backward. mechanism includes a pair of disks, a ball and which is interposed between them, Ri ball ramp mechanism der which the ball is unitized in a state of being interposed between the discs of said pair, said The ball ramp mechanism and the rotor of the electric motor have spline coupling portions that are slidably coupled to each other in the axial direction of the rotor, and are unitized. The ball ramp mechanism and an electric disk brake, characterized in that a rotor of the electric motor to allow the assembly attached by the spline coupling portion which is. The ball ramp mechanism has a ball interposed between said pair of disk and these pair of disks have covering the outer periphery of said pair of disks, one of said pair of disks A ball lamp unit housed in a case in which the formed spline joint is exposed and integrated, and the exposed spline joint of the ball lamp unit is splined to the spline joint of the rotor of the electric motor. 2. The electric disc brake according to claim 1, wherein the electric disc brake is combined and assembled. A caliper body, a pair of brake pads disposed on opposite sides of the disc rotor, a piston provided in the caliper body so as to press it so as to face one of the pair of brake pads, provided in the caliper body is the other in opposite claw portions of the pair of brake pads, an electric motor having a rotor provided in the caliper body, transmission for advancing and retreating movement of the piston is converted into a linear motion a rotational motion of the rotor of the electric motor An electric disc brake including a mechanism, wherein the transmission mechanism that converts rotational motion into linear motion is sub-assembled into a single unit, and the transmission mechanism and the rotor of the electric motor are arranged in the axial direction of the rotor. The transmission mechanism having a spline coupling portion slidably coupled to the spline and integrated with the sub-assembly, and the electric Electric disc brake, characterized in that the motor rotor and allow assembly coupled by the spline coupling portion. A pair of brake pads disposed on both sides of the disc rotor, a piston provided on the caliper body so as to face one of the pair of brake pads, and facing the other of the pair of brake pads provided on the caliper body A method of manufacturing an electric disc brake comprising: a claw portion; an electric motor having a rotor provided in the caliper body; and a transmission mechanism for converting the rotational movement of the rotor of the electric motor into a linear movement to move the piston forward and backward. A step of preparing an electric motor having a spline coupling portion on the rotor, and a subassembly of the transmission mechanism having a spline coupling portion slidably coupled to the spline coupling portion of the rotor in an axial direction; The sub-assembled transmission mechanism and the electric motor are connected to the spline coupling portion. Manufacturing method of the electric disk brake which comprises a the steps of assembling to be coupled to each other Ri.

Images