JP6756869B2 - Floating electric disc brake device - Google Patents

Description

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

As a disc brake device for braking vehicles such as automobiles, the caliper is freely supported for axial displacement with respect to the support, and a hydraulic cylinder (cylinder and piston) is provided on only one side of the caliper with respect to the rotor. A floating caliper type disc brake provided is known (see Patent Document 1). This allows the caliper that straddles the rotor to move 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. It is a disc brake that is configured to press the outer pad against the rotor with the claws on the outer side by moving the caliper due to the reaction force.

Further, there is 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 a rotor that rotates with 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 carriers, and a rotor. The carrier is equipped with an electric caliper that is supported so as to be movable along the axial direction of the rotor. The electric caliper incorporates an electric motor, a deceleration mechanism, a rotation-linear motion conversion mechanism, and a piston in the caliper body. Then, during braking, the rotation of the electric motor drives the rotation-linear motion conversion mechanism via the reduction mechanism, and the piston presses one brake pad against the rotor, and the caliper body moves due to the reaction force of the pressing by this piston. Then, braking is performed by pressing the other brake pad against the rotor, and braking is released by rotating the electric motor in the reverse direction and separating the brake pad from the rotor.

JP-A-2009-133356 JP-A-2009-287732

However, conventionally, in an electric disc brake device, a structure in which a motor gear unit including a rotation-linear motion conversion mechanism (thrust generation 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 sliding portion of the caliper may be deteriorated, vibration may occur, and the holding and sliding performance of the caliper may be adversely affected.

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

The above object according to the present invention is achieved by the following configuration.
(1) The thrust generating mechanism for pressing the outer pads and inner pads arranged on both axially side surfaces of the rotor rotating with the wheels against the rotor for braking, and the electric motor for driving the thrust generating mechanism are described above. Fixed to the car body adjacent to the rotor,
A floating electric disc brake provided with a slide mechanism capable of relative movement in the axial direction and transmission of rotational force between the rotation input member of the thrust generation mechanism and the output member rotated by the electric motor. It ’s a device,
A support fixed to the vehicle body adjacent to the rotor,
A main body wall portion arranged on the inner side of the bridge portion straddling the rotor and a claw portion arranged on the outer side are provided, and a caliper movably supported along the axial direction of the rotor by the support. ,
The inner pad arranged 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 the inner pad.
The outer pad arranged on the outer side of the rotor and held by the claw portion, and the outer pad.
An inner pad side piston that is interposed between the inner pad and the wall portion of the main body and presses the inner pad against the rotor by the thrust generation mechanism driven by power from the electric motor .
Floating type electric disc brake apparatus comprising: a, a main body wall portion side piston for pressing the inner side of the caliper to the body wall portion by the reaction force from the inner pad-side piston disposed on the same axis ..

According to the floating electric disc brake device having the configuration of (1) above, a thrust generating mechanism for pressing the outer pad and the inner pad against the rotor for braking and an electric motor for driving the thrust generating mechanism are adjacent to the rotor. Is supported by the car body. As a result, the caliper is lighter than the conventional structure in which the motor gear unit including the thrust generation mechanism is mounted on the caliper.
Further, since the thrust generation mechanism is fixed to the vehicle body, the thrust generation mechanism is driven by the rotation of the electric motor, the inner pad is pressed against the rotor by the inner pad side piston, and the pressure by the inner pad side piston is counteracted. When braking, the caliper moves by the piston on the wall side of the main body that presses the wall of the main body toward the inner side of the caliper, and the outer pad is pressed against the rotor. Although it moves, since a slide mechanism is provided between the output member and the output member rotated by the electric motor, the movement of the rotation input member in the axial direction is not hindered.
In addition, the thrust generation mechanism supported by the support expands the space between the inner pad and the main body wall of the caliper by expanding the inner pad side piston and the main body wall side piston arranged coaxially. To do. That is, the weight increase of the inner end of the caliper, which is caused by the conventional structure in which the motor gear unit is mounted on the inner end of the caliper, does not occur. As a result, deterioration of the weight balance with respect to the caliper sliding portion is suppressed, and vibration is less likely to occur.

(2) The floating type electric disc brake device according to (1) above, wherein a reduction mechanism is interposed between the electric motor and the thrust generation mechanism.

According to the floating type electric disc brake device having the configuration of (2) above, the deceleration mechanism interposed between the thrust generating mechanism and the electric motor is also supported by the vehicle body. As a result, the caliper is lighter than the conventional structure in which the motor gear unit including the reduction mechanism is mounted on the caliper.

(3) The cylinder body in which the thrust generating mechanism is housed, the electric motor and the motor gear housing in which the speed reduction mechanism is housed are integrally fixed to the support (2). ). Floating type electric disc brake device.

According to the floating type electric disc brake device having the configuration of (3) above, the cylinder body and the motor gear housing can be compactly integrated.

(4) Any of the above (1) to (3), wherein the reaction force from the inner pad side piston pushes the main body wall side piston toward the inner side of the caliper via an axial force sensor. The floating type electric disc brake device described in one.

According to the floating electric disc brake device having the configuration of (4) above, the thrust generating mechanism adjusts the magnitude of the force that presses the inner pad and the outer pad against both side surfaces of the rotor by feeding back based on the measurement signal of the axial force sensor. It can be done by control.

(5) The floating type electric disc brake device according to any one of (1) to (4) above, wherein the thrust generating mechanism has a ball lamp mechanism.

According to the floating type electric disc brake device having the configuration of (5) above, when the electric motor is driven, the drive spindle, which is a rotation input member of the ball lamp mechanism, is rotated. When the drive spindle is rotated, the drive side rotor moves in parallel with the driven side rotor toward the tip end side of the drive spindle. This translation pushes the inner pad and presses it against the rotor.
When the resistance between the drive-side rotor and the driven-side rotor to move toward the rotor becomes larger, the drive-side rotor and the driven-side rotor rotate relative to each other. Then, the rolling element moves to the shallow side of the lamp 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 is widened.
By increasing the distance between the drive side rotor and the driven side rotor, the inner end of the drive spindle provided on the side opposite to the inner pad is pushed out in the direction away from the inner pad. As a result, the caliper moves in the direction in which the wall portion of the main body separates from the inner pad. At this time, since the drive spindle can move relative to the output member in the axial direction and the rotational force can be transmitted, the drive spindle does not hinder the movement in the direction away from the inner pad. 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 type electric disc brake device according to the present invention, the weight load of the caliper can be reduced to realize smooth operation and improvement of vibration resistance.

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

It is a perspective view which looked at the floating type electric disc brake device which concerns on one Embodiment of this invention from obliquely above the caliper. FIG. 5 is a perspective view of the floating type electric disc brake device shown in FIG. 1 as viewed from diagonally below the electric motor. It is a vertical cross-sectional view including the axis of the drive spindle of the floating type electric disc brake device shown in FIG. It is a horizontal sectional view which includes the axis of the slide pin of the floating type electric disc brake device shown in FIG. It is an exploded perspective view of the floating type electric disc brake device which separated the caliper and the support. It is an exploded perspective view which separated the cylinder body and the motor gear housing from the caliper shown in FIG. It is an exploded perspective view which separated the cylinder body and the motor gear housing. It is an exploded perspective view of the motor gear housing.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the floating electric disc brake device 11 according to the 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, and the like. It has an electric motor 15 and a reduction mechanism 83 as main configurations.

The support 19 is fixed to the vehicle body (not shown) adjacent to the rotor 29 that rotates with the wheels (not shown). In this embodiment, the support 19 is arranged to face 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 entry side and the exit side of the rotor 29, which are both end sides of one of the long sides.

Pin insertion holes 35 are formed in each of the pair of arm portions 31, 33. The pin insertion hole 35 is for inserting the 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 bored in the support 19 at a position closer to the center of the rotor than the pin insertion hole 35 (both ends of the other long side). The support 19 is fixed to the vehicle body by inserting mounting screws (not shown) into the pair of mounting holes 37 and 39. An inner pad 21, which will be described later, is guided and mounted on the support 19 so as to be movable in the axial direction of the rotor 29.

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

FIG. 4 is a horizontal cross-sectional view including the axis of the slide pin 47 of the floating electric disc brake device 11 shown in FIG. 1, and FIG. 5 is an exploded perspective view of the floating electric disc brake device 11 in which the caliper 13 and the support 19 are separated. is there.
The caliper 13 is integrally formed with a pair of tubular portions 49, 51 having an axis along the axial direction of the rotor 29 on the outer side of the bridge portion 45. The pair of tubular portions 49, 51 are provided on both the entry side and the exit side of the rotor 29.

In the pair of tubular portions 49, 51, a hole penetrating along the axis is a sleeve insertion hole 53. The sleeve 55 is inserted into the sleeve insertion holes 53 of the tubular portions 49 and 51. The slide pin 47 is inserted into the sleeve 55 from the inner side. The tip of the slide pin 47 protrudes from the sleeve 55 and penetrates the pair of mounting portions 59 and 61 of the cylinder body 57 described later. The slide pin 47 penetrating the pair of mounting portions 59, 61 protrudes from the pin insertion hole 35 of the support 19. A torque receiving pin 63 is screwed into 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 mounting portions 59, 61, and the pair of arm portions 31, 33 are fixed in a state of being integrally sandwiched 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 tubular portions 49 and 51. Further, the torque receiving pin 63 screwed to the tip of the slide pin 47 is slidably inserted into the pin engaging hole 67 formed in the claw portion 43 of the caliper 13. As a result, in the caliper 13, the tubular portion 49 is slidably supported 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 tubular portions 49, 51 slide is covered with the sleeve boots 69, 71 to prevent dust.

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

The inner pad 21 is arranged 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. For example, the inner pad 21 has anchor protrusions (not shown) formed on both side edges, and a concave groove 36 (see FIG. 5) along the rotor axial direction is formed in the corresponding portion of the support 19, and the uneven fitting portion is formed. It can be a braking anchor section. By operating the electric motor 15, the inner pad 21 moves while being guided by the uneven fitting portion by the thrust generating mechanism 25 described later and is pressed against the rotor 29, and when it tries to rotate following the rotor 29. The uneven fitting part functions as an anchor and receives braking torque.

The outer pad 23 is arranged 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 pressing reaction force of 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 is 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 generation mechanism 25 is interposed between the inner pad 21 and the main body wall portion 41. The thrust generation mechanism 25 presses the inner pad 21 and the outer pad 23 against the axial side surfaces of the rotor 29, respectively, by expanding the space between the inner pad 21 and the main body wall 41 by the power from the electric motor 15.

FIG. 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. It is an exploded perspective view of 73.

Inside the caliper 13, a cylinder body 57 and a motor gear housing 73, which 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 mounting portions 59 and 61 of the cylinder body 57.

Both ends of the axis of the cylinder body 57 are opened on the inner pad side and the main body wall side of the caliper 13. The inner pad side piston 77 advances and retreats in the cylinder body 57. The outer circumference of the inner pad side piston 77 protruding from the inner pad 21 side of the cylinder body 57 is covered with the inner pad side piston boots 79 to prevent dust.

The gear housing 85 in the motor gear housing 73 includes a bottomed tubular reduction mechanism accommodating portion 86 accommodating the deceleration mechanism 83, and a transmission gear accommodating portion 138 in which a drive spindle insertion hole 137 is formed through the transmission gear 105. Has. Further, in the motor housing 87 of the motor gear housing 73, a bottomed tubular motor accommodating portion 88 accommodating the electric motor 15 and a piston 81 on the main body wall portion accommodating the drive spindle insertion hole 139 through which the motor housing 87 is accommodated move forward and backward. It has a piston housing portion 135 on the wall side of the main body. 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 body wall-side piston housing 135 are expanded by a thrust generating mechanism 25 provided between them. ..
The thrust generating mechanism 25 housed 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 turning side and the turning side of the rotor 29 in the support 19. It is fixed via a pair of mounting portions 59, 61 of the cylinder body 57 arranged on the outside. Then, the cylinder body 57 in which the thrust generation mechanism 25 is housed, and the motor gear housing 73 in which the electric motor 15 and the reduction mechanism 83 are housed are integrally fixed to the support 19.

Then, the power from the electric motor 15 is input to the final output gear 93 via the reduction mechanism 83 arranged coaxially. The power input to the final output gear 93 is a thrust force that meshes with the final output gear 93 and is offset with respect to the electric motor 15 via an output gear 91 arranged between the electric motor 15 and the reduction mechanism 83. The output is output to the drive spindle 17, which is a rotation input member of the generation mechanism 25.

The thrust generation mechanism 25 is composed of a combination of a feed screw mechanism 95 and a ball lamp mechanism 97 which is a high-efficiency axial force conversion mechanism.
The feed screw mechanism 95 is driven by screwing into a drive spindle (rotational input member) 17 driven via a transmission gear 105 rotated by an output gear 91 and a male screw portion 99 provided on the outer half of the drive spindle 17. It has a side rotor 101 and a thrust bearing 103 interposed between the inner side end 115 of the drive spindle 17 and the main body wall portion 41. 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 rotatably supported by the gear base 16. The drive spindle 17 is rotated via the transmission gear 105 by rotating the output gear 91. The male screw portion 99 of the drive spindle 17 is screwed into the screw hole 107 provided in the central portion of the drive side rotor 101 constituting the ball lamp mechanism 97.

The drive spindle 17 has a transmission mechanism capable of moving relative to the output gear 91, which is an output member, in the axial direction and transmitting rotational force. This relative movable and rotational force transmitting transmission mechanism is internally fitted into a pair of key portions 109 (see FIG. 7) formed on the drive spindle 17 at both ends in the radial direction and a transmission gear 105 so as not to rotate relative to each other. It is composed of a slide mechanism 110 formed of a pair of keyways 111 formed at both ends in the radial direction formed in the bush 18. That is, the drive spindle 17, the transmission gear 105, the key portion 109, the key groove 111, and the output gear 91 constitute the transmission gear device 113 having the slide mechanism 110.
The transmission mechanism of the drive spindle 17 that can move relative to the output gear 91 in the axial direction 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. However, it can also be configured by making the tooth width of the output gear sufficiently wide.

The ball lamp mechanism 97 includes the drive-side rotor 101, the driven-side rotor 117, and a plurality of rolling elements 119 interposed between the drive-side rotor 101 and the driven-side rotor 117. The drive-side rotor 101 and the driven-side rotor 117 face each other in the circumferential direction at a plurality of locations (for example, 3 to 4 locations), each of which has an arcuate shape when viewed in the axial direction. A certain drive-side lamp portion 121 and a driven-side lamp portion 123 are provided.

The depths of the drive-side lamp unit 121 and the driven-side lamp unit 123 in the axial direction gradually change with respect to the circumferential direction, but the direction of change is between the drive-side lamp unit 121 and the driven-side lamp unit 123. , The directions are opposite to each other. Therefore, when the drive side rotor 101 and the driven side rotor 117 are relatively rotated and each rolling element 119 is rolled along the drive side lamp portion 121 and the driven side lamp portion 123, the drive side rotor 101 and the driven side are driven. The distance between the rotors 117 is widened with great force.
Such a ball lamp mechanism 97 is loosely fitted and arranged on the inner diameter side of the inner pad side piston 77.

Further, an urging 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 peripheral side of the inner peripheral surface of the inner pad side piston 77. 127 is provided via the seat spring 129. The urging spring 127 imparts an elastic force to the drive-side rotor 101 in a direction opposite to the rotation direction when the drive-side rotor 101 is operated (when a braking force is generated) and an elastic force to the outer side. ing.

Further, the outer peripheral surface of the tip end portion of the driven side rotor 117 becomes a rotor side inclined surface 131 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 the partially conical concave receiving surface 133 inclined in the same direction at the same angle. The rotation of the driven rotor 117 is prevented 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 via the driven side rotor 117 by the extension of the ball lamp mechanism 97. The reaction force from the inner pad 21 that presses the rotor 29 is supported by the thrust bearing 103 that the inner end 115 of the drive spindle 17 abuts.

A drive spindle insertion hole 139 is opened in the piston housing portion 135 on the main body wall side of the motor housing 87. The inner end 115 side of the drive spindle 17 penetrates the transmission gear 105 inserted from the drive spindle insertion hole 137 of the transmission gear accommodating portion 138. The inner end 115 side of the drive spindle 17 penetrating the transmission gear 105 is inserted into the drive spindle insertion hole 139 of the main body wall side piston accommodating portion 135. The inner end 115 of the drive spindle 17 inserted into 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 accommodating portion 135.

The main body wall side piston 81 is housed in the main body wall side piston accommodating portion 135 so as to be able to advance and retreat. The outer circumference of the main body wall side piston 81 protruding from the main body wall 41 side of the main body wall side piston accommodating portion 135 is covered with the main body wall side piston boots 143 to prevent dust.

The thrust bearing 103 is movably supported in the axial direction of the rotor 29 inside the bottomed tubular body wall side piston 81. The thrust bearing 103 supports the inner 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 toward the main body wall 41 side by receiving the reaction force from the drive spindle 17 on the inner bottom surface 147 via the axial force sensor 145. The outer bottom surface 149 of the main body wall side piston 81 comes into contact with the piston contact recess 151 formed in the main body wall 41 of the caliper 13.

The speed reduction mechanism 83 has a gear housing 85 that defines a gear accommodation space. The reduction mechanism accommodating portion 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 gear. A first planetary carrier 159 that holds the planetary gear 157 around the first sun gear 155 so as to rotate freely, and a first internal tooth 161 that is formed on the inner peripheral surface of the gear housing 85 and meshes with the first planetary gear 157. The second sun gear 163, which is arranged on the electric motor 15 side with respect to the first sun gear 155 and rotates integrally with the first planet carrier 159, and the second planet gear 165 that meshes 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 rotate freely, and a second internal tooth that is formed on the inner peripheral surface of the gear housing 85 and meshes with the second planetary gear 165. The final output gear 93, which is arranged on the electric motor 15 side with respect to the second sun gear 163 and is rotationally driven by the second planet carrier 167, and the input gear shaft 153 that meshes with the final output gear 93. A rotatable output gear 91 is provided around a parallel rotation axis.

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

Next, the operation of the floating type electric disc brake device 11 described above will be described.
When the floating type electric disc brake device 11 operates the electric brake, the output shaft 171 of the electric motor 15 is rotated by energizing the electric motor 15. The rotational movement of the output shaft 171 is transmitted to the deceleration mechanism 83. The rotation decelerated 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 constituting the thrust generation mechanism 25 to rotationally drive the drive spindle 17.

In the initial stage of this rotary 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 urging spring 127 or the like. Then, the drive-side rotor 101 moves in parallel with the driven-side rotor 117 toward the tip end side of the drive spindle 17 based on the screwing between the male screw portion 99 of the drive spindle 17 and the screw hole 107 of the drive-side rotor 101. Move 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 toward the inner side of the caliper 13 via the axial force sensor 145. The caliper 13 whose main body wall portion 41 is pushed toward the inner side by the main body wall portion side piston 81 presses the outer pad 23 against the axial side surface of the rotor 29 because the claw portion 43 is moved in the direction of approaching the rotor 29. .. During such translation, each rolling element 119 is located at the deepest end of the drive-side lamp portion 121 and the driven-side lamp portion 123.

As a result of parallel movement, the gap between each part is lost, and when the resistance to the drive side rotor 101 and the driven side rotor 117 to move further toward the rotor 29 increases, the drive side rotor 101 among them becomes the drive spindle. It rotates together with 17, and the driven 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 driven side lamp portion 121 and the driven side lamp portion 123 while rolling, and the distance between the driven side rotor 117 and the driven side rotor 101 is widened. Since the inclination angle between the driven side lamp portion 123 and the driven side lamp portion 121 is gentle, the force for increasing the distance between the driven side rotor 117 and the driven side rotor 101 is increased.

The force that widens the distance between the driven side rotor 117 and the driven side rotor 101 further pushes the inner pad side piston 77 toward the outer side. The extruded inner pad side piston 77 presses the inner pad 21 against the rotor 29. The reaction force from the inner pad 21 further pushes the main body wall side piston 81 toward the inner side of the caliper 13 via the drive spindle 17, together with a force that widens the distance between the driven side rotor 117 and the drive side rotor 101.

As a result, the thrust generation mechanism 25 can brake 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 that presses 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 feed forward control that adjusts the amount of electricity supplied to the electric motor 15.

When the operation of the floating type electric disc brake device 11 is released, the electric motor 15 is energized so that the output shaft 171 of the electric motor 15 is operated in the direction opposite to that when the electric motor 15 is operated (when a braking force is generated). Rotate by a predetermined amount (a sufficient amount of rotation to release the braking force). The rotational movement of the output shaft 171 is transmitted to the input gear shaft 153 of the reduction mechanism 83 in the same path as 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 reduction gear mechanism 83, the drive spindle 17 of the feed screw mechanism 95 constituting the thrust generation mechanism 25 is rotationally driven. To do. Then, the distance between the driven-side rotor 117 and the driven-side rotor 101 is narrowed, and the driven-side rotor 101 moves in parallel with the driven-side rotor 117 toward the inner end 115 side of the drive spindle 17. By this parallel movement, the inner pad side piston 77 is returned to the inner pad 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 is 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 type electric disc brake device 11 according to the present embodiment described above will be described.
In the floating type electric disc brake device 11 of the present embodiment, the thrust generating mechanism 25 for pressing the outer pad 23 and the inner pad 21 against the rotor 29 to brake, the electric motor 15 for driving the thrust generating mechanism 25, and the electric motor 15 The speed reduction mechanism 83 interposed between the thrust generation mechanism 25 and the thrust generation mechanism 25 is supported by a support 19 which is a vehicle body adjacent to the rotor 29. As a result, the caliper 13 is lighter than the conventional structure in which the motor gear unit including the thrust generation mechanism is mounted on the caliper.

Further, since the thrust generation mechanism 25 is fixed to the support 19 which is the vehicle body, the thrust generation mechanism 25 is driven via the reduction mechanism 83 by the rotation of the electric motor 15, and the inner pad 21 is pressed by the rotor 29. The caliper 13 moves due to the reaction force of the pressing by the inner pad 21, and the drive spindle 17 of the thrust generating mechanism 25 moves in the axial direction together with the caliper 13 at the time of braking when the outer pad 23 is pressed against the rotor 29. A slide mechanism 110 composed of a key portion 109 and a key groove 111 is provided between the output gear 91 rotated by the reduction mechanism 83, which hinders the axial movement of the drive spindle 17. There is no such thing.

Further, in the floating type electric disc brake device 11 of the present embodiment, the thrust generating mechanism 25 is provided with respect to the arm portions 31 provided on both the turning side and the turning side of the rotor 29 in the support 19. It is fixed via a mounting portion 59 arranged on the outer side in the radial direction of 25. Therefore, the thrust generation mechanism 25 can easily realize a stable arrangement in which the expansion drive central axis is aligned with the center position (substantially the center of gravity position) of the inner pad 21 and the outer pad 23.

Further, in the floating type electric disc brake device 11 of the present embodiment, the thrust generation mechanism 25 is housed in the cylinder body 57. Further, the electric motor 15 and the reduction mechanism 83 are housed in the motor gear housing 73. Then, the cylinder body 57 and the motor gear housing 73 are integrally fixed to the support 19. As a result, the weight load of the caliper 13 is reduced.
Further, in the motor gear housing 73, the electric motor 15 and the reduction mechanism 83 are coaxially arranged. This coaxial cable is arranged in parallel (offset arrangement) in the same direction as the axis of the cylinder body 57. In the motor gear housing 73, the output gear 91 is arranged at a substantially central position in the axial direction between the electric motor 15 and the reduction gear mechanism 83 arranged coaxially. The power of the electric motor 15 is input to the output gear 91 by the final output gear 93 of the reduction gear 83 via the reduction mechanism 83. That is, the power from the electric motor 15 is decelerated and input to the thrust generation mechanism 25 via the output gear 91.

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

Further, in the floating type electric disc brake device 11 of the present embodiment, when the electric motor 15 is driven and the output gear 91 that meshes with the final output gear 93 is rotated, the transmission gear 105 that meshes with the output gear 91 is used. The drive spindle 17 is rotated. When the drive spindle 17 is rotated, the drive side rotor 101, together with the driven side rotor 117, of the drive spindle 17 based on the screwing between the male screw portion 99 of the drive spindle 17 and the screw hole 107 of the drive side rotor 101. It moves in 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 pressed against the rotor 29.

When the resistance to the drive-side rotor 101 and the driven-side rotor 117 to move toward the rotor 29 becomes larger, the drive-side rotor 101 rotates together with the drive spindle 17, and the drive-side rotor 101 and the driven-side rotor 101 are covered. 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 driven side lamp portion 121 while rolling, and the distance between the driven side rotor 101 and the driven side rotor 117 is widened.

By increasing the distance between the drive-side rotor 101 and the driven-side rotor 117, the inner end 115 of the drive spindle 17 provided on the side opposite to the inner pad 21 is pushed out in a direction away from the inner pad 21. The inner side end 115 presses the main body wall portion 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 the direction in which the main body wall portion 41 separates from the inner pad 21. At this time, since the drive spindle 17 can move relative to the transmission gear 105 in the axial direction and can transmit the rotational force, the drive spindle 17 does not hinder the movement in the direction away from the inner pad 21. As a result, 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 portion 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, the weight load of the caliper 13 can be reduced to realize smooth operation and improvement of vibration resistance.

Here, the features of the embodiments of the floating electric disc brake device according to the present invention described above are briefly summarized below.
[1] A thrust generating mechanism for pressing an outer pad and an inner pad arranged on both axially side surfaces of a rotor rotating with wheels against the rotor for braking, an electric motor for driving the thrust generating mechanism, and the electric motor. A deceleration mechanism interposed between the motor and the thrust generating mechanism is fixed to the vehicle body adjacent to the rotor.
A slide mechanism (110) that can move relative to the axial direction and can transmit the rotational force is provided between the rotation input member of the thrust generation mechanism and the output gear rotated by the reduction mechanism. Featuring a floating electric disc brake device.
[2] The cylinder body in which the thrust generating mechanism is housed, the electric motor and the motor gear housing in which the speed reduction mechanism is housed are integrally fixed to the vehicle body, and the power from the electric motor is coaxially It is input to the final output gear via the reduction mechanism arranged in the above, meshes with the final output gear, and is offset with respect to the electric motor via an output gear arranged between the electric motor and the reduction mechanism. The floating type electric disc brake device according to the above [1], wherein the output is output to the rotation input member of the arranged thrust generating mechanism.
[3] A support fixed to the vehicle body adjacent to the rotor, a main body wall portion arranged on the inner side of the bridge portion straddling the rotor, and a claw portion arranged on the outer side are provided, and the support is provided. A caliper movably supported along the axial direction of the rotor, an inner pad arranged on the inner side of the rotor and guided so as to be movable in the axial direction of the rotor by the support, and the rotor. The outer pad arranged on the outer side and held by the claw portion is interposed between the inner pad and the main body wall portion, and the inner pad and the main body wall portion are driven by the 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 is provided, and the thrust generating mechanism rotates with the turning side of the rotor in the support. The floating according to the above [1] or [2], wherein the arm portions provided on both sides are fixed to the arm portions provided on both sides via mounting portions arranged on the outer side in the radial direction of the thrust generating mechanism. Type electric disc brake device.
[4] The thrust generating mechanism is composed of 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. The drive spindle, the drive side rotor screwed into the male screw portion provided on the outer half of the drive spindle, and the thrust bearing interposed between the inner side end of the drive spindle and the main body wall portion. The high-efficiency axial force conversion mechanism has a drive-side rotor, a driven-side rotor, and a rolling element interposed between the driven-side rotor and the driven-side rotor. The above-mentioned one of [1] to [3], wherein the spindle has a transmission mechanism capable of moving relative to the transmission gear in the axial direction and transmitting a rotational force. Floating type electric disc brake device.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

11 ... Floating type electric disc brake device 13 ... Caliper 15 ... Electric motor 17 ... Drive spindle (rotation input member)
19 ... Support 21 ... Inner pad 23 ... Outer pad 25 ... Thrust generation 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 ... Mounting Part 73 ... Motor gear housing 83 ... Reduction mechanism 91 ... Output gear (output member)
93 ... Final output gear 95 ... Feed screw mechanism 97 ... Ball lamp mechanism (high-efficiency axial force conversion mechanism)
99 ... Male threaded portion 101 ... Driven side rotor 103 ... Thrust bearing 110 ... Slide mechanism 117 ... Driven side rotor 119 ... Rolling element

Claims (5)

A thrust generating mechanism for pressing the outer pads and inner pads arranged on both sides of the rotor rotating together with the wheels in the axial direction to brake the rotor, and an electric motor for driving the thrust generating mechanism are adjacent to the rotor. And fixed to the car body,
A floating electric disc brake provided with a slide mechanism capable of relative movement in the axial direction and transmission of rotational force between the rotation input member of the thrust generation mechanism and the output member rotated by the electric motor. It ’s a device,
A support fixed to the vehicle body adjacent to the rotor,
A main body wall portion arranged on the inner side of the bridge portion straddling the rotor and a claw portion arranged on the outer side are provided, and a caliper movably supported along the axial direction of the rotor by the support. ,
The inner pad arranged 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 the inner pad.
The outer pad arranged on the outer side of the rotor and held by the claw portion, and the outer pad.
An inner pad side piston that is interposed between the inner pad and the wall portion of the main body and presses the inner pad against the rotor by the thrust generation mechanism driven by power from the electric motor .
Floating type electric disc brake apparatus comprising: a, a main body wall portion side piston for pressing the inner side of the caliper to the body wall portion by the reaction force from the inner pad-side piston disposed on the same axis .. The floating electric disc brake device according to claim 1, wherein a deceleration mechanism is interposed between the electric motor and the thrust generation mechanism. The second aspect of claim 2, wherein the cylinder body in which the thrust generating mechanism is housed, the electric motor, and the motor gear housing in which the speed reduction mechanism is housed are integrally fixed to the support. Floating electric disc brake device. The floating according to any one of claims 1 to 3, wherein the reaction force from the inner pad side piston pushes the main body wall side piston toward the inner side of the caliper via an axial force sensor. Type electric disc brake device. The floating electric disc brake device according to any one of claims 1 to 4, wherein the thrust generating mechanism includes a ball lamp mechanism.

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