JP2017020565A - Floating-type electric disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating-type electric disc brake device which reduces a weight load of a caliper, and is achieved in a smooth operation and the improvement of durability.SOLUTION: A floating-type electric disc brake device 11 comprises: a thrust generation mechanism 25 which brakes an outer pad 23 and an inner pad 21 arranged at both side faces of a rotor 29 which rotate together with wheels in an axial direction by press-pushing them to a rotor 29; and an electric motor 15 which drives the thrust generation mechanism 25. A reduction mechanism 83 interposed between the electric motor 15 and the thrust generation mechanism 25 is fixed to a support 19 while adjoining the rotor 29, and a slide mechanism 110 which is relatively movable to an axial direction, and transmittable in a rotation force is arranged between a drive spindle 17 of the thrust generation mechanism 25 and an output gear 91 which is rotated by the reduction mechanism 83.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a floating electric disc brake device.

  As a disc brake device for braking a vehicle such as an automobile, the caliper is supported by a support so as to be freely displaced in the axial direction, and a hydraulic cylinder (cylinder and piston) is provided only on one side of the caliper with respect to the rotor. A provided floating caliper type disc brake is known (see Patent Document 1). This is because the caliper straddling the rotor can be moved along the rotor axial direction via a pair of guide pins with respect to the support attached to the vehicle body, and the inner pad is rotated by the hydraulic cylinder installed on the inner side of the caliper. The disc brake is configured such that the outer pad is pressed against the rotor by a claw on the outer side when the caliper is moved by the reaction force.

  There is also an electric disc brake device in which the hydraulic cylinder of the disc brake is replaced with an electric motor (see Patent Document 2). This electric disc brake device is arranged so as to straddle the rotor, a rotor that rotates together with the wheels, a carrier that is fixed to the vehicle body side, a pair of brake pads that are arranged on both sides of the rotor and supported by the carrier, An electric caliper supported by the carrier so as to be movable along the axial direction of the rotor is provided. The electric caliper is a caliper body in which an electric motor, a speed reduction mechanism, a rotation-linear motion conversion mechanism, and a piston are incorporated. At the time of braking, the rotation-linear motion conversion mechanism is driven by the rotation of the electric motor through the speed reduction mechanism, and one brake pad is pressed against the rotor by the piston, and the caliper body is moved by the reaction force of the pressing by the piston. Then, braking is performed by pressing the other brake pad against the rotor, and the braking is released by rotating the electric motor in reverse to separate the brake pad from the rotor.

JP 2009-133356 A JP 2009-287732 A

  However, conventionally, in an electric disc brake device, a structure in which a motor gear unit including a rotation-linear motion conversion mechanism (thrust generating mechanism) is mounted on a caliper is common. In such a structure, since the motor gear unit is mounted on the inner side end of the caliper, the weight on the inner side of the caliper increases. As a result, the weight balance with respect to the caliper sliding portion deteriorates, and vibrations may occur, which may adversely affect caliper holding and sliding performance.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a floating type electric disc brake device capable of reducing the weight load of the caliper and realizing smooth operation and improved vibration resistance.

The above object of the present invention is achieved by the following configuration.
(1) A thrust generating mechanism for pressing and braking an outer pad and an inner pad respectively disposed on both axial sides of a rotor rotating together with a wheel against the rotor, an electric motor for driving the thrust generating mechanism, and the electric A speed reduction mechanism interposed between the motor and the thrust generation mechanism is fixed to the vehicle body adjacent to the rotor;
A slide mechanism is provided between the rotation input member of the thrust generation mechanism and the output gear rotated by the speed reduction mechanism, so as to be relatively movable in the axial direction and to transmit the rotational force. Floating type electric disc brake device.

According to the floating electric disk brake device having the configuration (1), the thrust generating mechanism for pressing the outer pad and the inner pad against the rotor for braking and the electric motor for driving the thrust generating mechanism are adjacent to the rotor. Supported by the vehicle body. Furthermore, a speed reduction mechanism interposed between the thrust generation mechanism and the electric motor is also supported by the vehicle body. As a result, the caliper is reduced in weight compared to the conventional structure in which the motor gear unit including the thrust generating mechanism is mounted on the caliper.
Further, since the thrust generating mechanism is fixed to the vehicle body, the thrust generating mechanism is driven via the speed reduction mechanism by the rotation of the electric motor, the inner pad is pressed against the rotor, and the reaction force of the pressing by the inner pad is At the time of braking when the caliper moves and the outer pad is pressed against the rotor, the rotation input member of the thrust generating mechanism moves in the axial direction together with the caliper, but between the output gear rotated by the speed reduction mechanism, the slide mechanism Therefore, the movement of the rotation input member in the axial direction is not hindered.

(2) A cylinder body in which the thrust generating mechanism is accommodated, a motor gear housing in which the electric motor and the speed reduction mechanism are accommodated are integrally fixed to the vehicle body, and the power from the electric motor is coaxially Is input to the final output gear via the speed reduction mechanism disposed in the position, and meshes with the final output gear and is offset with respect to the electric motor via an output gear disposed between the electric motor and the speed reduction mechanism. The floating electric disk brake device according to (1) above, wherein the floating electric disk brake device is output to the rotation input member of the thrust generating mechanism arranged.

  According to the floating electric disk brake device having the configuration (2), the cylinder body and the motor gear housing are offset, so that the axial length is shorter than the structure in which the cylinder body and the motor gear housing are coaxially arranged. it can. Further, the power from the electric motor can be output to the thrust generating mechanism by the output gear from a substantially central position in the axial direction of the motor gear housing. Thereby, a cylinder body and a motor gear housing can be integrated compactly.

(3) A support fixed to the vehicle body adjacent to the rotor, a main body wall portion disposed on the inner side of the bridge portion straddling the rotor, and a claw portion disposed on the outer side are provided, and the support A caliper supported movably along the axial direction of the rotor, the inner pad disposed on the inner side of the rotor and guided by the support so as to be movable in the axial direction of the rotor, The outer pad disposed on the outer side and held by the claw portion, and interposed between the inner pad and the main body wall portion, and the inner pad and the main body wall portion are driven by power from the electric motor. A thrust generation mechanism that presses the inner pad and the outer pad against the axial side surface of the rotor by expanding the gap, respectively, and generates the thrust The structure is fixed to the arm portions provided on both the turning-in side and the turning-out side of the rotor in the support via attachment portions disposed on the radially outer side of the thrust generating mechanism. The floating electric disk brake device according to (1) or (2), characterized in that it is characterized in that

According to the floating electric disk brake device having the configuration (3), the thrust generating mechanism is supported by the support arm portion via the mounting portion. An electric motor that drives the thrust generating mechanism is also supported by the support. As a result, the caliper is reduced in weight compared to the conventional structure in which the motor gear unit including the axial force conversion mechanism is mounted on the caliper.
The thrust generating mechanism supported by the support expands between the inner pad and the caliper main body wall. That is, the weight increase at the inner side end of the caliper, which is caused by the conventional structure in which the motor gear unit is mounted on the inner side end of the caliper, does not occur. Thereby, the deterioration of the weight balance with respect to the caliper sliding part is suppressed, and vibration is less likely to occur.
Further, the thrust generating mechanism is fixed to the arm portions provided on both the rotor entrance side and the outlet side of the support via attachment portions disposed on the radially outer side of the thrust generating mechanism. For this reason, the thrust generating mechanism can easily realize a stable arrangement in which the expansion drive center axis is made to coincide with the center position (substantially the center of gravity position) of the inner pad and the outer pad.

(4) The thrust generation mechanism is configured by a combination of a feed screw mechanism and a high-efficiency axial force conversion mechanism, and the feed screw mechanism is driven via a transmission gear that is rotated by the output gear. As a drive spindle, a drive-side rotor screwed into a male screw portion provided on an outer half of the drive spindle, a thrust bearing interposed between an inner-side end of the drive spindle and the body wall portion The high-efficiency axial force conversion mechanism includes the driving-side rotor, the driven-side rotor, and a rolling element interposed between the driving-side rotor and the driven-side rotor, and the driving The spindle according to any one of (1) to (3) above, wherein the spindle has a transmission mechanism capable of moving relative to the transmission gear in the axial direction and capable of transmitting rotational force. Floaty Grayed type electric disc brake device.

According to the floating electric disc brake device having the configuration (4), when the electric motor is driven, the drive spindle is rotated via the transmission gear rotated by the output gear. When the drive spindle is rotated, the drive-side rotor moves in parallel with the driven-side rotor toward the front end side of the drive spindle. By this parallel movement, the inner pad is pushed out and pressed against the rotor.
When the resistance against the further movement of the driving side rotor and the driven side rotor toward the rotor increases, the driving side rotor and the driven side rotor rotate relative to each other. Then, the rolling element moves to the shallower side of the ramp portion between the driving side rotor and the driven side rotor while rolling, and the distance between the driving side rotor and the driven side rotor increases.
As the distance between the drive-side rotor and the driven-side rotor increases, the inner end of the drive spindle provided on the opposite side of the inner pad is pushed away from the inner pad. As a result, the caliper moves in a direction in which the main body wall separates from the inner pad. At this time, the drive spindle can move relative to the transmission gear in the axial direction and can transmit the rotational force, so that the movement in the direction away from the inner pad is not hindered. As a result, the caliper presses the outer pad held by the claw portion against the rotor, and each of the inner pad and the outer pad is pressed against the axial side surface of the rotor.

  According to the floating electric disc brake device of the present invention, it is possible to reduce the weight load of the caliper and realize smooth operation and improved vibration resistance.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

It is the perspective view which looked at the floating type electric disc brake device concerning one embodiment of the present invention from the slanting upper part of a caliper. It is the perspective view which looked at the floating type electric disc brake device shown in FIG. 1 from the diagonally lower side of the electric motor. FIG. 2 is a longitudinal sectional view including an axis of a drive spindle of the floating electric disk brake device shown in FIG. 1. FIG. 2 is a horizontal sectional view including an axis of a slide pin of the floating electric disc brake device shown in FIG. 1. It is a disassembled perspective view of the floating type electric disc brake device in which the caliper and the support are separated. FIG. 6 is an exploded perspective view in which a cylinder body and a motor gear housing are separated from the caliper shown in FIG. 5. It is the disassembled perspective view which isolate | separated the cylinder body and the motor gear housing. It is a disassembled perspective view of a motor gear housing.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 3, the floating electric disk brake device 11 according to an embodiment of the present invention includes a support 19, a caliper 13, an inner pad 21, an outer pad 23, a thrust generating mechanism 25, The electric motor 15 and the speed reduction mechanism 83 are included as main components.

  The support 19 is fixed to a vehicle body (not shown) adjacent to a rotor 29 that rotates together with wheels (not shown). In the present embodiment, the support 19 is disposed facing the inner surface of the rotor 29. The support 19 is formed in a substantially rectangular plate shape, and a pair of arm portions 31 and 33 are provided on both the turn-in side and the turn-out side of the rotor 29 that are both ends of one long side portion.

  A pin insertion hole 35 is formed in each of the pair of arm portions 31 and 33. The pin insertion hole 35 is for inserting a slide pin 47 described later. The slide pin 47 is fixed to the support 19 via a sleeve 55 described later. A pair of mounting holes 37 and 39 are formed in the support 19 at positions closer to the center of the rotor than the pin insertion holes 35 (both ends of the other long side portion). The support 19 is fixed to the vehicle body by inserting mounting screws (not shown) through the pair of mounting holes 37 and 39. An inner pad 21 described later is guided and attached to the support 19 so as to be movable in the axial direction of the rotor 29.

  The caliper 13 is formed by integrally connecting the main body wall portion 41 disposed on the inner side of the bridge portion 45 straddling the rotor 29 and the claw portion 43 disposed on the outer side. The caliper 13 is supported by the support 19 so as to be movable along the axial direction of the rotor 29 by a pair of left and right parallel sleeves 55 (described later).

4 is a horizontal sectional view including the axis of the slide pin 47 of the floating electric disk brake device 11 shown in FIG. 1, and FIG. 5 is an exploded perspective view of the floating electric disk brake device 11 with the caliper 13 and the support 19 separated. is there.
On the caliper 13, a pair of cylindrical portions 49 and 51 are integrally formed on the outside sandwiching the bridge portion 45, the axis line being along the axial direction of the rotor 29. The pair of cylindrical portions 49 and 51 are provided on both the turn-in side and the turn-out side of the rotor 29.

  As for a pair of cylinder parts 49 and 51, the hole penetrated along an axis serves as sleeve penetration hole 53. The sleeve 55 is inserted into the sleeve insertion hole 53 of each of the tube portions 49 and 51. The slide pin 47 is inserted into the sleeve 55 from the inner side. The slide pin 47 has a tip projecting from the sleeve 55 and penetrating a pair of attachment portions 59 and 61 of a cylinder body 57 described later. The slide pin 47 penetrating the pair of attachment portions 59 and 61 protrudes from the pin insertion hole 35 of the support 19. A torque receiving pin 63 is screwed to the tip of the slide pin 47 protruding from the pin insertion hole 35 of the support 19. That is, the sleeve 55, the pair of attachment portions 59, 61, and the pair of arm portions 31, 33 are fixed in a state of being sandwiched integrally by the pin head 65 (see FIG. 4) and the torque receiving pin 63.

  The sleeve 55 is fixed to the support 19 by the slide pin 47 as described above. In the caliper 13, the sleeve 55 is slidably inserted into the sleeve insertion holes 53 of the cylindrical portions 49 and 51. The torque receiving pin 63 screwed to the tip of the slide pin 47 is slidably inserted into a pin engagement hole 67 formed in the claw portion 43 of the caliper 13. As a result, the caliper 13 is supported so that the cylindrical portion 49 is slidable with respect to the sleeve 55 and the torque receiving pin 63 integrally fixed to the support 19. The outer peripheral surface of the sleeve 55 on which the pair of cylindrical portions 49 and 51 slide is covered with sleeve boots 69 and 71 to be dust-proof.

  Thus, the caliper 13 straddling the rotor 29 is movable along the axial direction of the rotor 29 via the pair of left and right parallel sleeves 55 with respect to the support 19 attached to the vehicle body.

  The inner pad 21 is disposed on the inner side of the rotor 29 and is guided by the support 19 so as to be movable in the axial direction of the rotor 29. The inner pad 21 is formed with anchor protrusions (not shown) on both side edges, for example, and a concave groove 36 (see FIG. 5) is formed in the corresponding portion of the support 19 along the rotor axial direction. It can be set as a braking anchor part. When the inner pad 21 is operated by the electric motor 15 to move while being guided by the projection / recess fitting portion 25 to be pressed against the rotor 29 and to follow the rotor 29, the inner pad 21 is rotated. The concave-convex fitting portion functions as an anchor and receives braking torque.

  The outer pad 23 is disposed on the outer side of the rotor 29 and is held by the claw portion 43. The caliper 13 is guided by the sleeve 55 by the reaction force applied by the inner pad 21 and moves toward the inner side along the axial direction of the rotor 29. That is, the claw portion 43 of the caliper 13 approaches the rotor 29. As a result, the outer pad 23 is pressed against the rotor 29 by the claw portion 43. The braking torque of the outer pad 23 is transmitted to the caliper 13 via the sleeve 55 and the torque receiving pin 63 and further transmitted to the support 19.

  The caliper 13 is moved along the axial direction of the rotor 29 by the thrust generating mechanism 25. The thrust generating mechanism 25 is interposed between the inner pad 21 and the main body wall portion 41. The thrust generating mechanism 25 presses the inner pad 21 and the outer pad 23 against the axial side surface of the rotor 29 by expanding the space between the inner pad 21 and the main body wall 41 by the power from the electric motor 15.

  6 is an exploded perspective view in which the cylinder body 57 and the motor gear housing 73 are separated from the caliper 13 shown in FIG. 5, FIG. 7 is an exploded perspective view in which the cylinder body 57 and the motor gear housing 73 are separated, and FIG. 8 is a motor gear housing. 73 is an exploded perspective view of 73. FIG.

  Inside the caliper 13, a cylinder body 57 and a motor gear housing 73 that are integrally fixed are arranged. The cylinder body 57 and the motor gear housing 73 are fixed to the support 19 via a pair of attachment portions 59 and 61 of the cylinder body 57.

  The cylinder body 57 opens at both ends on the inner pad side and the main body wall side of the caliper 13. In the cylinder body 57, the inner pad side piston 77 advances and retreats. The outer periphery of the inner pad side piston 77 protruding from the inner pad 21 side of the cylinder body 57 is covered with an inner pad side piston boot 79 to be dust-proof.

  The gear housing 85 in the motor gear housing 73 includes a bottomed cylindrical reduction mechanism accommodation portion 86 that accommodates the reduction mechanism 83, a transmission gear accommodation portion 138 that has a drive spindle insertion hole 137 formed therethrough and accommodates the transmission gear 105. Have The motor housing 87 in the motor gear housing 73 has a bottomed cylindrical motor accommodating portion 88 that accommodates the electric motor 15 and a body wall side piston 81 that is accommodated by a drive spindle insertion hole 139 penetrating and retracting. And a main body wall side piston accommodating portion 135. The gear housing 85 and the motor housing 87 constituting the motor gear housing 73 are integrally fixed by fastening bolts 89.

The inner pad side piston 77 housed in the cylinder body 57 and the main body wall side piston 81 housed in the main body wall side piston housing part 135 are expanded by the thrust generating mechanism 25 provided therebetween. .
The thrust generating mechanism 25 accommodated in the cylinder body 57 is in the radial direction of the thrust generating mechanism 25 with respect to the pair of arm portions 31 and 33 provided on both the return side and the return side of the rotor 29 in the support 19. It is fixed via a pair of attachment portions 59 and 61 of the cylinder body 57 disposed on the outside. The cylinder body 57 in which the thrust generation mechanism 25 is accommodated and the motor gear housing 73 in which the electric motor 15 and the speed reduction mechanism 83 are accommodated are integrally fixed to the support 19.

  The power from the electric motor 15 is input to the final output gear 93 via the speed reduction mechanism 83 arranged on the same axis. The power input to the final output gear 93 is thrust offset with respect to the electric motor 15 via an output gear 91 that meshes with the final output gear 93 and is disposed between the electric motor 15 and the speed reduction mechanism 83. It is output to a drive spindle 17 that is a rotation input member of the generating mechanism 25.

The thrust generation mechanism 25 is configured by a combination of a feed screw mechanism 95 and a ball ramp mechanism 97 that is a high-efficiency axial force conversion mechanism.
The feed screw mechanism 95 is a drive spindle (rotation input member) 17 driven via a transmission gear 105 rotated by an output gear 91 and a drive screwed to a male screw portion 99 provided on the outer half of the drive spindle 17. The side rotor 101 and the thrust bearing 103 interposed between the inner side end 115 of the drive spindle 17 and the main body wall 41 are provided. A transmission gear 105 is provided on the outer periphery of the drive spindle 17. The transmission gear 105 meshes with an output gear 91 that is rotatably supported by the gear base 16. The drive spindle 17 is rotated via the transmission gear 105 when the output gear 91 is rotated. The male screw portion 99 of the drive spindle 17 is screwed into a screw hole 107 provided in the central portion of the drive side rotor 101 constituting the ball ramp mechanism 97.

The drive spindle 17 has a transmission mechanism that can move relative to the output gear 91 in the axial direction and can transmit rotational force. The transmission mechanism capable of relatively moving and transmitting the rotational force is fitted into the pair of key portions 109 (see FIG. 7) at both ends in the diameter direction formed on the drive spindle 17 and the transmission gear 105 so as not to be relatively rotatable. The slide mechanism 110 is constituted by a pair of key grooves 111 formed on the bush 18 at both ends in the diameter direction. That is, the drive spindle 17, the transmission gear 105, the key portion 109, the key groove 111, and the output gear 91 constitute a transmission gear device 113 having the slide mechanism 110.
Note that the transmission mechanism of the drive spindle 17 that can move in the axial direction relative to the output gear 91 and can transmit the rotational force is not limited to the slide mechanism 110, but is a transmission gear fixed to the drive spindle 17. On the other hand, the tooth width of the output gear can be sufficiently widened.

  The ball ramp mechanism 97 includes the driving side rotor 101, the driven side rotor 117, and a plurality of rolling elements 119 interposed between the driving side rotor 101 and the driven side rotor 117. The driving-side rotor 101 and the driven-side rotor 117 have a plurality of circumferential positions on the surfaces facing each other at a plurality of positions (for example, three to four positions), each having an arc shape when viewed in the axial direction. A driving side lamp unit 121 and a driven side lamp unit 123 are provided.

The depths in the axial direction of the driving side lamp part 121 and the driven side lamp part 123 gradually change with respect to the circumferential direction. However, the direction of change varies between the driving side lamp part 121 and the driven side lamp part 123. The directions are opposite to each other. Therefore, when the driving-side rotor 101 and the driven-side rotor 117 are relatively rotated and each rolling element 119 is rolled along the driving-side ramp portion 121 and the driven-side ramp portion 123, the driving-side rotor 101 and the driven-side rotor are The distance between the rotors 117 is increased with a large force.
Such a ball ramp mechanism 97 is arranged so as to be loosely fitted inside the inner pad side piston 77.

  Further, a biasing spring is provided between the inner side surface of the tip end portion (left end portion in FIG. 3) of the drive side rotor 101 and the retaining ring 125 fixed to the inner side of the inner peripheral surface of the inner pad side piston 77. 127 is provided via a seat spring 129. The urging spring 127 gives the driving-side rotor 101 an elastic force in a direction opposite to the rotation direction when the driving-side rotor 101 is operated (when a braking force is generated) and an elastic force toward the outer side. ing.

  Further, the outer peripheral surface of the tip end portion of the driven-side rotor 117 is a rotor-side inclined surface 131 that is inclined in a direction in which the outer diameter becomes smaller toward the outer side. The rotor-side inclined surface 131 is provided on the inner surface of the tip of the inner pad-side piston 77 and faces a partially conical concave receiving surface 133 inclined at the same angle in the same direction. The driven-side rotor 117 is prevented from rotating by the wedge effect based on the contact between the rotor-side inclined surface 131 and the receiving surface 133.

  The thrust generation mechanism 25 presses the inner pad side piston 77 and the inner pad 21 through the driven side rotor 117 by the extension of the ball ramp mechanism 97. The reaction force from the inner pad 21 that presses the rotor 29 is supported by the thrust bearing 103 with which the inner side end 115 of the drive spindle 17 abuts.

  A drive spindle insertion hole 139 is opened in the piston housing part 135 on the body wall side of the motor housing 87. The drive spindle 17 penetrates the transmission gear 105 inserted through the drive spindle insertion hole 137 of the transmission gear accommodating portion 138 on the inner side end 115 side. An inner side end 115 side of the drive spindle 17 penetrating the transmission gear 105 is inserted into a drive spindle insertion hole 139 of the main body wall side piston housing part 135. The inner end 115 of the drive spindle 17 inserted through the drive spindle insertion hole 139 is brought into contact with the thrust bearing 103 in the main body wall side piston 81 housed in the main body wall side piston housing part 135.

  The body wall side piston 81 is housed in the body wall side piston housing part 135 so as to freely advance and retract. The outer periphery of the main body wall portion side piston 81 protruding from the main body wall portion 41 side of the main body wall portion side piston accommodating portion 135 is covered and protected by the main body wall portion side piston boot 143.

  The thrust bearing 103 is supported so as to be movable in the axial direction of the rotor 29 inside the bottomed cylindrical body wall side piston 81. The thrust bearing 103 supports the inner side end 115 of the drive spindle 17 and receives a reaction force from the inner pad 21 received by the drive spindle 17. An axial force sensor 145 is provided between the thrust bearing 103 and the inner bottom surface 147 of the main body wall side piston 81. The main body wall side piston 81 is projected to the main body wall 41 side by receiving the reaction force from the drive spindle 17 at the inner bottom surface 147 via the axial force sensor 145. The outer bottom surface 149 of the body wall side piston 81 abuts on a piston abutting recess 151 formed on the body wall 41 of the caliper 13.

  The speed reduction mechanism 83 has a gear housing 85 that defines a gear housing space. The reduction gear housing 86 of the gear housing 85 includes an input gear shaft 153, a first sun gear 155 that rotates integrally with the input gear shaft 153, a first planetary gear 157 that meshes with the first sun gear 155, and a first A first planet carrier 159 that holds the planetary gear 157 around the first sun gear 155 so as to freely rotate and revolves, and first inner teeth 161 that are formed on the inner peripheral surface of the gear housing 85 and mesh with the first planetary gear 157. A second sun gear 163 disposed on the electric motor 15 side with respect to the first sun gear 155 and rotating integrally with the first planet carrier 159; a second planet gear 165 meshing with the second sun gear 163; A second planetary carrier 167 that holds the second planetary gear 165 around the second sun gear 163 so as to freely rotate and revolves, and is formed on the inner peripheral surface of the gear housing 85 and meshes with the second planetary gear 165. The second internal teeth 169 and the second sun gear 163 are disposed on the electric motor 15 side and are meshed with the final output gear 93 and the final output gear 93 that is rotationally driven by the second planetary carrier 167. An output gear 91 that is rotatable around a rotation axis parallel to the input gear shaft 153 is provided.

  The speed reduction mechanism 83 decelerates the high speed rotation from the output shaft 171 of the electric motor 15 with a large reduction ratio by a two-stage planetary gear mechanism connected in series, and transmits it to the final output gear 93. The rotation of the final output gear 93 is transmitted to the output gear 91 and finally input from the output gear 91 to the transmission gear 105 of the thrust generating mechanism 25.

Next, the operation of the floating electric disk brake device 11 will be described.
When operating the electric brake, the floating electric disc brake device 11 rotates the output shaft 171 of the electric motor 15 by energizing the electric motor 15. The rotational movement of the output shaft 171 is transmitted to the speed reduction mechanism 83. The rotation reduced by the reduction mechanism 83 rotates the output gear 91 via the final output gear 93. The rotation of the output gear 91 is transmitted to the transmission gear 105 and then transmitted to the drive spindle 17 of the feed screw mechanism 95 that constitutes the thrust generating mechanism 25 to drive the drive spindle 17 to rotate.

  In the initial stage of this rotational drive, the drive-side rotor 101 does not rotate due to the frictional resistance between the rotor-side inclined surface 131 and the receiving surface 133 and the resistance of the biasing spring 127 and the like. Then, the drive-side rotor 101 moves in parallel with the driven-side rotor 117 to the front end side of the drive spindle 17 based on the threaded engagement between the male screw portion 99 of the drive spindle 17 and the screw hole 107 of the drive-side rotor 101 ( It moves toward the rotor 29 without rotating). By this parallel movement, the inner pad side piston 77 is pushed out to the outer side, and the gap between the axial side surface of the rotor 29 and the inner pad 21 is closed. The reaction force from the inner pad 21 pressed against the rotor 29 is transmitted to the thrust bearing 103 via the drive spindle 17. The reaction force transmitted to the thrust bearing 103 pushes the main body wall side piston 81 to the inner side via the axial force sensor 145. The caliper 13 in which the main body wall portion 41 is pushed out to the inner side by the main body wall portion side piston 81 is moved in a direction in which the claw portion 43 approaches the rotor 29, so that the outer pad 23 is pressed against the axial side surface of the rotor 29. . During such parallel movement, each rolling element 119 is located at the deepest end of the driving side ramp portion 121 and the driven side ramp portion 123.

  As a result of the parallel movement, gaps between the respective parts are lost, and when the resistance to the movement of the driving-side rotor 101 and the driven-side rotor 117 further toward the rotor 29 is increased, the driving-side rotor 101 is driven by the driving spindle. 17 and the drive-side rotor 101 and the driven-side rotor 117 rotate relative to each other. Then, each rolling element 119 moves to the shallower side of the driving side ramp portion 121 and the driven side ramp portion 123 while rolling, and the interval between the driven side rotor 117 and the driving side rotor 101 increases. Since the inclination angles of the driven-side lamp portion 123 and the driving-side lamp portion 121 are loose, the force for increasing the distance between the driven-side rotor 117 and the driving-side rotor 101 is increased.

  The force that widens the distance between the driven-side rotor 117 and the driving-side rotor 101 further pushes the inner pad-side piston 77 toward the outer side. The pushed-out inner pad side piston 77 presses the inner pad 21 against the rotor 29. The reaction force from the inner pad 21 pushes the main body wall side piston 81 further to the inner side through the driving spindle 17 together with the force for expanding the distance between the driven side rotor 117 and the driving side rotor 101.

  As a result, the thrust generating mechanism 25 can perform braking by pressing the inner pad 21 and the outer pad 23 against both side surfaces of the rotor 29 with a large force. The magnitude of the force for pressing the inner pad 21 and the outer pad 23 against both side surfaces of the rotor 29 can be adjusted by feedback control based on the measurement signal of the axial force sensor 145. It can also be performed by feedforward control that adjusts the amount of current supplied to the electric motor 15.

  When releasing the operation of the floating electric disk brake device 11, the electric motor 15 is energized, so that the output shaft 171 of the electric motor 15 is operated in a direction opposite to that during operation (when the braking force is generated). It is rotated by a predetermined amount (a sufficient rotation amount to release the braking force). The rotational movement of the output shaft 171 is transmitted to the input gear shaft 153 of the speed reduction mechanism 83 through the same path as that during operation. Further, after the rotational movement of the input gear shaft 153 is transmitted to the output gear 91 via the final output gear 93 of the speed reduction mechanism 83, the drive spindle 17 of the feed screw mechanism 95 constituting the thrust generating mechanism 25 is rotationally driven. To do. Then, the distance between the driven-side rotor 117 and the driving-side rotor 101 is narrowed, and the driving-side rotor 101 moves in parallel with the driven-side rotor 117 toward the inner side end 115 side of the driving spindle 17. By this parallel movement, the inner pad side piston 77 is returned to the inner side, and the gap between the axial side surface of the rotor 29 and the inner pad 21 is widened. Since the caliper 13 from which the pressing force of the thrust generating mechanism 25 has been released becomes movable in the axial direction together with the drive spindle 17, the outer pad 23 can also be separated from the axial side surface of the rotor 29.

Next, the operation of the floating electric disc brake device 11 according to the present embodiment will be described.
In the floating electric disk brake device 11 of the present embodiment, a thrust generating mechanism 25 for pressing the outer pad 23 and the inner pad 21 against the rotor 29 for braking, an electric motor 15 for driving the thrust generating mechanism 25, and the electric motor 15 A speed reduction mechanism 83 interposed between the thrust generation mechanism 25 and the thrust generation mechanism 25 is supported by a support 19 that is a vehicle body adjacent to the rotor 29. Thereby, the caliper 13 is reduced in weight as compared with the conventional structure in which the motor gear unit including the thrust generating mechanism is mounted on the caliper.

  Further, since the thrust generating mechanism 25 is fixed to the support 19 that is a vehicle body, the thrust generating mechanism 25 is driven via the speed reduction mechanism 83 by the rotation of the electric motor 15, and the inner pad 21 is pressed against the rotor 29. During the braking operation in which the caliper 13 is moved by the reaction force of the inner pad 21 and the outer pad 23 is pressed by the rotor 29, the drive spindle 17 of the thrust generating mechanism 25 moves in the axial direction together with the caliper 13. Between the output gear 91 rotated by the speed reduction mechanism 83, the slide mechanism 110 constituted by the key portion 109 and the key groove 111 is provided, which hinders the movement of the drive spindle 17 in the axial direction. There is nothing.

  Further, in the floating type electric disk brake device 11 of the present embodiment, the thrust generation mechanism 25 is provided with respect to the arm portion 31 provided on both the turn-in side and the turn-out side of the rotor 29 in the support 19. 25 is fixed via a mounting portion 59 arranged radially outward. For this reason, the thrust generating mechanism 25 can easily realize a stable arrangement in which the expansion drive center axis is made to coincide with the center position (substantially the center of gravity position) of the inner pad 21 and the outer pad 23.

Further, in the floating electric disk brake device 11 of the present embodiment, the thrust generating mechanism 25 is accommodated in the cylinder body 57. The electric motor 15 and the speed reduction mechanism 83 are accommodated in the motor gear housing 73. The cylinder body 57 and the motor gear housing 73 are integrally fixed to the support 19. Thereby, the weight load of the caliper 13 is reduced.
Furthermore, the motor gear housing 73 is provided with the electric motor 15 and the speed reduction mechanism 83 coaxially. The coaxial is arranged in parallel with the axis of the cylinder body 57 (offset arrangement). In the motor gear housing 73, an output gear 91 is disposed at a substantially central position in the axial direction between the electric motor 15 and the speed reduction mechanism 83 arranged on the same axis. The power of the electric motor 15 is input to the output gear 91 by the final output gear 93 of the speed reduction mechanism 83 via the speed reduction mechanism 83. In other words, the power from the electric motor 15 is decelerated and input to the thrust generating mechanism 25 via the output gear 91.

  Therefore, in the floating type electric disc brake device 11 of the present embodiment, the cylinder body 57 and the motor gear housing 73 are offset, so that the axial length is shorter than the structure in which these are coaxially arranged. it can. Further, the power from the electric motor 15 can be output to the thrust generating mechanism 25 by the output gear 91 from the substantially central position in the axial direction of the motor gear housing 73. Thereby, the cylinder body 57 and the motor gear housing 73 can be integrated compactly. As a result, in the floating type electric disc brake device 11, the weight balance with respect to the caliper sliding portion is good, and vibration is less likely to occur. Further, the holding and sliding performance of the caliper 13 is improved.

  In the floating electric disk brake device 11 of the present embodiment, when the electric motor 15 is driven and the output gear 91 meshing with the final output gear 93 is rotated, the transmission gear 105 meshing with the output gear 91 is transmitted. The drive spindle 17 is rotated. When the drive spindle 17 is rotated, the drive-side rotor 101 moves together with the driven-side rotor 117 together with the driven-side rotor 117 based on the threaded engagement between the male screw portion 99 of the drive spindle 17 and the screw hole 107 of the drive-side rotor 101. It moves parallel to the tip side (moves toward the rotor 29 without rotating). By this parallel movement, the inner pad side piston 77 is pushed out, and the inner pad 21 is pushed against the rotor 29.

  When the resistance against the movement of the drive-side rotor 101 and the driven-side rotor 117 further toward the rotor 29 is increased, the drive-side rotor 101 rotates with the drive spindle 17 and the drive-side rotor 101 and the driven-side rotor The drive-side rotor 117 rotates relative to each other. Then, the rolling element 119 moves to the shallower side of the driven side lamp portion 123 and the driving side ramp portion 121 while rolling, and the interval between the driving side rotor 101 and the driven side rotor 117 is increased.

  As the distance between the drive-side rotor 101 and the driven-side rotor 117 increases, the inner side end 115 of the drive spindle 17 provided on the side opposite to the inner pad 21 is pushed away from the inner pad 21. The inner end 115 presses the body wall 41 of the caliper 13 by being pushed out by receiving a reaction force from the inner pad 21. As a result, the caliper 13 moves in a direction in which the main body wall portion 41 is separated from the inner pad 21. At this time, the drive spindle 17 can move relative to the transmission gear 105 in the axial direction and can transmit the rotational force, so that the movement in the direction away from the inner pad 21 is not hindered. Thus, the caliper 13 presses the outer pad 23 held by the claw portion 43 against the rotor 29. That is, the thrust generating mechanism 25 expands the space between the inner pad 21 and the main body wall 41, so that each of the inner pad 21 and the outer pad 23 is pressed against the axial side surface of the rotor 29.

  Therefore, according to the floating type electric disc brake device 11 according to the present embodiment, it is possible to reduce the weight load of the caliper 13 and realize smooth operation and improved vibration resistance.

Here, the features of the embodiment of the floating electric disk brake device according to the present invention described above will be briefly summarized below.
[1] A thrust generation mechanism for pressing and braking an outer pad and an inner pad respectively disposed on both axial sides of a rotor that rotates together with a wheel against the rotor, an electric motor that drives the thrust generation mechanism, and the electric A speed reduction mechanism interposed between the motor and the thrust generation mechanism is fixed to the vehicle body adjacent to the rotor;
Between the rotation input member of the thrust generation mechanism and the output gear rotated by the speed reduction mechanism, there is provided a slide mechanism (110) that can be relatively moved in the axial direction and can transmit the rotational force. Floating type electric disc brake device.
[2] A cylinder body in which the thrust generation mechanism is accommodated, a motor gear housing in which the electric motor and the speed reduction mechanism are accommodated are integrally fixed to the vehicle body, and the power from the electric motor is coaxially Is input to the final output gear via the speed reduction mechanism disposed in the position, and meshes with the final output gear and is offset with respect to the electric motor via an output gear disposed between the electric motor and the speed reduction mechanism. The floating electric disk brake device according to [1], wherein the floating type electric disk brake device is output to the rotation input member of the thrust generation mechanism arranged.
[3] A support fixed to the vehicle body adjacent to the rotor, a main body wall portion disposed on the inner side of the bridge portion straddling the rotor, and a claw portion disposed on the outer side are provided, and the support A caliper supported movably along the axial direction of the rotor, the inner pad disposed on the inner side of the rotor and guided by the support so as to be movable in the axial direction of the rotor, The outer pad disposed on the outer side and held by the claw portion, and interposed between the inner pad and the main body wall portion, and the inner pad and the main body wall portion are driven by power from the electric motor. A thrust generating mechanism that presses the inner pad and the outer pad against the axial side surface of the rotor by expanding the space, respectively, and the thrust generator The structure is fixed to the arm portions provided on both the turning-in side and the turning-out side of the rotor in the support via attachment portions disposed on the radially outer side of the thrust generating mechanism. The floating electric disk brake device according to [1] or [2], which is characterized in that
[4] The thrust generating mechanism is configured by a combination of a feed screw mechanism and a high-efficiency axial force conversion mechanism, and the feed screw mechanism is driven via a transmission gear rotated by the output gear. As a drive spindle, a drive-side rotor screwed into a male screw portion provided on an outer half of the drive spindle, a thrust bearing interposed between an inner-side end of the drive spindle and the body wall portion The high-efficiency axial force conversion mechanism includes the driving-side rotor, the driven-side rotor, and a rolling element interposed between the driving-side rotor and the driven-side rotor, and the driving The spindle according to any one of the above [1] to [3], wherein the spindle has a transmission mechanism capable of moving relative to the transmission gear in the axial direction and capable of transmitting rotational force. Flotin Type electric disc brake device.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 ... Floating type electric disc brake device 13 ... Caliper 15 ... Electric motor 17 ... Drive spindle (rotation input member)
DESCRIPTION OF SYMBOLS 19 ... Support 21 ... Inner pad 23 ... Outer pad 25 ... Thrust generating mechanism 29 ... Rotor 31 ... Arm part 33 ... Arm part 41 ... Main body wall part 43 ... Claw part 45 ... Bridge part 57 ... Cylinder body 59 ... Mounting part 61 ... Installation Portion 73 ... Motor gear housing 83 ... Reduction mechanism 91 ... Output gear 93 ... Final output gear 95 ... Feed screw mechanism 97 ... Ball ramp mechanism (high efficiency axial force conversion mechanism)
99 ... Male screw portion 101 ... Driving side rotor 103 ... Thrust bearing 110 ... Slide mechanism 117 ... Driven side rotor 119 ... Rolling element

Claims (4)

A thrust generating mechanism for pressing and braking an outer pad and an inner pad respectively disposed on both axial sides of the rotor rotating with the wheel against the rotor; an electric motor for driving the thrust generating mechanism; the electric motor; A speed reduction mechanism interposed between the thrust generating mechanism and the rotor adjacent to the rotor,
A slide mechanism is provided between the rotation input member of the thrust generation mechanism and the output gear rotated by the speed reduction mechanism, so as to be relatively movable in the axial direction and to transmit the rotational force. Floating type electric disc brake device.   A cylinder body in which the thrust generation mechanism is accommodated, and a motor gear housing in which the electric motor and the speed reduction mechanism are accommodated are integrally fixed to the vehicle body, and the power from the electric motor is arranged coaxially. It is input to the final output gear via the speed reduction mechanism, and is offset with respect to the electric motor via an output gear that meshes with the final output gear and is disposed between the electric motor and the speed reduction mechanism. 2. The floating electric disk brake device according to claim 1, wherein the floating electric disk brake device is output to the rotation input member of the thrust generating mechanism.   A support fixed to the vehicle body adjacent to the rotor, a main body wall portion disposed on the inner side of the bridge portion straddling the rotor, and a claw portion disposed on the outer side are provided, and the rotor is supported by the support. A caliper supported movably along the axial direction of the rotor, the inner pad disposed on the inner side of the rotor and guided by the support so as to be movable in the axial direction of the rotor, and on the outer side of the rotor The outer pad, which is disposed and held by the claw, is interposed between the inner pad and the main body wall, and is expanded between the inner pad and the main body wall by power from the electric motor. A thrust generation mechanism that presses the inner pad and the outer pad against the side surface in the axial direction of the rotor by opening, the thrust generation mechanism, The support is fixed to the arm portions provided on both the return side and the return side of the rotor via attachment portions arranged on the radially outer side of the thrust generating mechanism. The floating electric disk brake device according to claim 1 or 2.   The thrust generation mechanism is configured by a combination of a feed screw mechanism and a high-efficiency axial force conversion mechanism, and the feed screw mechanism is driven as a rotation input member that is driven via a transmission gear that is rotated by the output gear. A spindle, a drive-side rotor that is screwed into a male screw portion provided on an outer-side half of the drive spindle, and a thrust bearing that is interposed between an inner-side end of the drive spindle and the body wall portion The high-efficiency axial force conversion mechanism includes the driving-side rotor, the driven-side rotor, and a rolling element interposed between the driving-side rotor and the driven-side rotor, and the driving spindle is The floating electric motor according to any one of claims 1 to 3, further comprising a transmission mechanism capable of moving relative to the transmission gear in the axial direction and capable of transmitting rotational force. Click brake system.

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