JP2008045703A - Disc brake with electric parking function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake device excelling in weight balance as the whole brake device by adding an electric parking function to a conventionally-known fluid type service brake device. <P>SOLUTION: This disc brake with electric parking comprises a caliper 1; a piston slidably supported in the caliper; an adjusting spindle 11a mounted into the piston; and a rotation / linear motion conversion mechanism type mechanism double roller lamp arranged at the end of the adjusting spindle. The double roller lamp comprises first and second roller plugs 16, 21 arranged at ends of the adjusting spindle 11a; a camshaft 14; rolling rollers 11, 15; a worm wheel 18 fixed to the camshaft; and a worm shaft 14 meshed with the worm wheel. The worm is arranged parallel with the adjusting spindle and mounted to an output shaft of a motor disposed on the caliper side rather than the camshaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disc brake with an electric parking function which is provided with a fluid service brake and an electric parking brake.

  Conventionally, an electric motor type brake device that performs a brake operation by driving an electric motor has been proposed (Patent Documents 1 and 2). In addition, a disc brake device has been proposed in which a mechanical brake mechanism for parking operation is configured as a cam mechanism having no rotation support portion and a small number of parts (Patent Document 3).

  The brake device described in Patent Document 1 drives an electric motor, converts a rotational drive motion into a linear motion via a gear and a rolling element ramp mechanism, and performs a brake operation. The brake and parking brake can be operated.

  Further, the disc brake device described in Patent Document 2 includes an irreversible reduction actuator having a motor, a worm, a worm wheel, and first and second gears, and the brake operation drives the motor. The screw shaft is rotated through the drive worm, worm wheel and first and second gears, and the rotation of the screw shaft is converted into a linear motion, so that the piston can be linearly moved to operate the brake. Yes. And this thing is an irreversible type in the axial direction of the braking center axis of both brake pads at the time of braking by arranging the irreversible deceleration actuator so that the center of gravity is located on the braking center axis of the opposing brake pad. The reaction force applied to the deceleration actuator acts on the center of gravity of the irreversible deceleration actuator, and as a result, the irreversible deceleration actuator is less likely to sway with respect to the caliper.

Further, the one described in Patent Document 3 adopts a configuration in which the adjusting spindle is moved in the axial direction via the cam mechanism, and further the piston is moved to act as a brake, thereby making the parking brake mechanism compact. It can be done.
JP 2000-510932 A JP 2002-89598 A JP 2001-20983 A

  However, the device described in Patent Document 1 includes a rear adjustment device (motor) for adjusting the gap between the brake shoe and the brake disc in addition to the motor for the service brake and the parking brake. In addition, there is a problem that the size of the entire brake device is large.

  In addition, since the irreversible deceleration actuator is arranged so that its center of gravity is located on the braking center axis of the opposing brake pad, the irreversible deceleration actuator is mounted on the brake caliper body. There is a problem that the center of gravity of the brake device becomes biased toward the motor arrangement side and becomes unstable. In addition, the conventionally known brake device 50 taken up in Patent Document 2 is also a brake device because the center of gravity K of the motor 53 is offset with respect to the central axis Lo of the sliding caliper 51 as shown in FIG. There is a problem that the center of gravity is biased toward the motor arrangement side and becomes unstable. In the figure, reference numeral 52 denotes a transmission device.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to add an electric parking function to a conventionally known fluid service brake device and to further balance the weight of the brake device as a whole. It is to provide an excellent disc brake device. In addition, the electric parking brake mechanism is assembled as an external type through a simple assembly tool on the outer side of one end of the caliper without being stored in the caliper, so it can be manufactured at low cost without any effort. Accordingly, it is an object of the present invention to provide a disc brake device that does not increase the vehicle mounting space.

For this reason, the technical solution means adopted by the present invention is:
In a disc brake with electric parking that can generate a parking brake force by a rotation / linear motion conversion type double roller lamp operated by a motor, the disc brake is slidably supported in the caliper and the caliper. A piston, an adjustment spindle mounted in the piston, and a rotation / linear motion conversion mechanism mechanism double roller lamp disposed at an end of the adjustment spindle, wherein the rotation / linear motion conversion mechanism mechanism double roller lamp is an adjustment The first and second roller plugs arranged at the end of the spindle, the camshaft arranged between the first and second roller plugs, and the rolling arranged between the first and second roller plugs and the camshaft. A roller, a worm wheel fixed to the camshaft, An electric parking function, wherein the worm shaft is arranged parallel to the adjustment spindle axis and is attached to an output shaft of a motor arranged on the caliper side of the camshaft. It is a disc brake with.

  The camshaft to which the worm wheel is attached is a disc brake with an electric parking function, which is held between the first and second roller plugs so as to be movable in the axial direction of the worm shaft.

  The camshaft to which the worm wheel is fixed is a disc brake with an electric parking function that is configured to be guided and moved in a guide formed in a cap of a gear case.

  Further, in the disc brake with an electric parking function, the mesh point between the worm shaft and the worm wheel is configured to be shifted in the axial direction of the worm shaft.

The disc brake with an electric parking function according to the present invention has the above configuration.
1. Since the electric parking brake motor can be mounted close to the caliper, the weight balance of the entire brake device can be improved.
2. By adopting a double roller ramp mechanism (camshaft and first and second roller plug mechanisms), an efficient braking force can be exhibited.
3. Parking force can be efficiently maintained by using a worm shaft and worm wheel mechanism as a mechanism for transmitting rotational force from the motor to the camshaft (using the irreversibility of the worm shaft).
4). Further, since the worm wheel output shaft can be floated, the frictional resistance generated on the shaft is reduced, and a highly efficient conversion mechanism can be configured.
5. The movement of the worm wheel in the axial direction can be performed smoothly by allowing the camshaft to move in the lateral direction in the guide formed with the cap.
And the like.

The present invention
Rotation / linear motion conversion mechanism type double roller lamp operated by a motor is a disc brake with an electric parking that can generate parking brake force, and the rotation / linear motion conversion mechanism mechanism double disposed at the end of the adjusting spindle A roller ramp, wherein the double roller ramp is arranged between the first and second roller plugs at the end of the adjusting spindle and between the first and second roller plugs, and the first and second roller plugs. A rolling roller disposed between the camshaft and the camshaft, a worm wheel fixed to the camshaft, and a worm shaft meshing with the worm wheel, the worm shaft being disposed in parallel with the adjustment spindle axis; and Motor placed on the caliper side of the camshaft It is attached to the output shaft. With this configuration, the electric parking brake motor can be attached to the caliper side, and the weight balance of the entire brake device can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional view of the entire main part of a disc brake actuator with an electric parking function according to the present invention, FIG. 2 is an exploded perspective view of the main part of the electric parking mechanism, and FIG. 3 includes a CC cross section in FIG. FIG. 4 is a sectional view taken along the line AA in FIG. 1, FIG. 5 is a sectional view taken along line BB in FIG. 4, FIG. 6 is a sectional view taken along line EE in FIG. It is DD sectional drawing in FIG.

  As shown in FIG. 1, the disc brake operating device according to the present embodiment includes a caliper assembly CA and an electric parking mechanism EP.

  The caliper assembly CA includes a caliper 1 and a piston 10 that is built in the caliper 1 and is slidable relative to the caliper 1 in the brake center axis direction of the brake pads 3 and 4 as is conventionally known. The piston 10 is slidably held in the caliper 1 with a known structure, and the piston 10 is configured to move in the braking central axis direction by the fluid pressure generated in the liquid chamber 10a when the service brake is applied. A dust-proof boot 5 is attached between the piston 10 and the caliper 1, and the caliper 1 is slidably supported with respect to the fixed support 2. In the figure, 6 is a seal. The structure of the piston and caliper is the same as that conventionally known, and further detailed description is omitted.

  An adjustment assembly 10A is built in the piston 10 to compensate for wear of the brake pads and to prevent over-adjustment. As the adjust assembly 10A, a conventionally known reversible screw type is used. The adjustment assembly 10A includes an adjustment spindle 11a having a reversible screw, an adjustment sleeve 11b screwed to the adjustment spindle 11a, a bearing 11c and a seal 7 for supporting the rotation of the adjustment sleeve 11b, and an electric motor described later. The parking mechanism EP includes a spring 8, a clip 9, a holder 12, and the like.

  The adjustment spindle 11a is slidably supported with respect to the caliper 1. When the wear of the brake pads 3 and 4 exceeds a specified level, the adjustment sleeve 11b rotates forward with respect to the adjustment spindle 11a, and the piston 10 is released when the brake is released. The retracted position of the brake is advanced to compensate for wear of the brake pads 3 and 4. If excessive brake fluid pressure is applied to the piston 10, the adjustment sleeve 11 b cannot rotate with respect to the adjustment spindle 11 a, and the adjustment spindle 11 a resists the spring force of the spring 8. Moreover, since it moves forward, over-adjustment is prevented. The configuration of the adjust assembly 10A is conventionally known, and detailed description thereof is omitted here.

  In the present embodiment, the adjusting spindle 11a is attached so that the end opposite to the piston 10 protrudes from the caliper 1 as shown in FIG. 1, and the electric parking mechanism EP (details will be described later) To be arranged).

  The electric parking mechanism EP is housed in a housing 17 fixed to the caliper 1, and employs a rotation / linear motion conversion mechanism type double roller lamp. The rotation / linear motion conversion mechanism type double roller lamp employs a mechanism similar to that disclosed and published by the present applicant (Japanese Patent Laid-Open No. 2006-189148).

  The structure of the rotation / linear motion conversion type double roller lamp will be described below with reference to the drawings. In FIGS. 1, 2, 4 and 5, the caliper 1 has a housing 17 detachable by appropriate means such as a bolt 13. The first roller plug 16 and the second roller plug 21 are disposed in the housing 17. As shown in FIGS. 1 and 2, the first roller plug 16 is fitted with a convex portion 16 a formed on the first roller plug 16 in a concave portion 17 a formed on the housing 17. It is supported so that it cannot rotate. As shown in FIGS. 1 and 2, the second roller plug 21 is supported in a non-rotatable manner by fitting a convex portion 21a formed on the second roller plug 21 into a concave portion 11d formed on the adjusting spindle 11a. A holder 12 (see FIGS. 1 and 2) formed so as to wrap the second roller plug 21 is disposed on the outer periphery of the second roller plug 21, and a spring 8 is disposed between the holder 12 and the caliper 1. The second roller plug 21 is urged to the right in FIG. In FIG. 1, 9 is a clip.

  A camshaft 14 is disposed between the first roller plug 16 and the second roller plug 21. Cam surfaces 16b and 21b are formed on the first and second roller plugs 16 and 21, respectively, and the cam shaft 14 disposed between the first and second roller plugs 16 and 21 also has the first and second cam surfaces. Cam surfaces 14a and 14b are formed facing the cam surfaces formed on the roller plugs 16 and 21, and the rolling roller 11 having a circular cross section is formed between the first and second roller plugs 16 and 21 and the camshaft 14, respectively. , 15 are arranged. A ring 20 is attached below the rolling roller to prevent the rolling roller from falling off.

  As shown in FIGS. 4, 5, and 7, a worm wheel 18 is non-rotatably attached to the camshaft 14, and a worm shaft 22 (see FIG. 7) is engaged with the worm wheel 18 in an orthogonal manner. ing. The worm shaft 22 is attached to the output shaft 26a of the motor 26 as shown in FIG. The motor 26 is attached to the caliper 1 so that the output shaft 26a thereof is parallel to the axis of the adjustment spindle 11a, and the motor 26 itself is disposed on the brake pad side with respect to the position of the camshaft 14. With this arrangement, the center of gravity of the entire brake device is arranged close to the center of gravity of the caliper 1.

  A gear case 17b for housing the worm wheel 18 is formed integrally with the housing 17 above the camshaft 14, and the worm wheel 18 is non-rotatably attached to the end of the camshaft 14 in the gear case 17b. ing. The inner diameter of the gear case 17b is formed larger than the outer shape of the worm wheel 18 so as not to hinder the rotation of the worm wheel 18 and the movement of the adjustment spindle 11a in the axial direction (described later), and the central axis of the gear case 17b is also electrically driven. The configuration is shifted from the center of the worm wheel 18 when the parking brake is not operated, and the worm wheel 18 does not interfere with the gear case 17b even if the worm wheel 18 moves when the parking brake is operated.

  A cap 25 is attached to the gear case 17b, and a guide 25a for accommodating the end of the camshaft 14 is formed on the cap 25 as shown in FIG. The guide 25a is formed by a recess formed as a long groove along the axial direction of the adjusting spindle 11a. However, a long hole through which the end of the camshaft 14 passes may be used instead of the long groove. With this guide, the camshaft 14 can move within the guide 25a in the axial direction of the adjusting spindle 11a and within the clearance of the guide 25a without interfering with the cap 25. Thus, since the camshaft 14 (the output shaft of the worm wheel) has a floating configuration, the frictional resistance generated on the shaft is reduced, and a highly efficient conversion mechanism can be configured.

  The brake operation of the present invention will be described with reference to the drawings. In a normal service brake, a brake fluid pressure is applied to a liquid chamber 10a formed by a caliper 1 and a piston 10 by operating a brake pedal (not shown), and the piston 10 is located on the left side relative to the caliper 1 in FIG. , The brake pad 4 is operated, and then the disc is clamped together with the brake pad 3 to apply the brake. When the brake pedal is released, the brake fluid pressure disappears, the piston 10 returns to the initial position, and the brake is released. The operation of this service brake is the same as that of the conventional brake device.

  When the parking operation is performed in order to operate the electric parking brake, the motor 26 rotates. The rotation of the motor 26 rotates the worm shaft 22 coupled to the output shaft 26a of the motor. The rotation of the worm shaft 22 is transmitted to the worm wheel 18 and the camshaft 14 rotates. When the camshaft 14 rotates, the rolling rollers 11 and 15 protrude from the outer periphery of the camshaft 14 by the action of the cam surfaces 14a and 14b of the camshaft 14 and the cam surfaces 16b and 21b of the first and second roller plugs 16 and 21. Due to the protruding action of the rolling rollers 11 and 15, the second roller plug 21 is moved to the left in FIG. 1 against the urging force of the spring 8, and as a result, the adjusting spindle 11a is moved in the axial direction. The parking brake can be actuated by pressing the piston 10 toward the disc by the movement of the adjusting spindle 11a in the axial direction (brake pad direction).

  By the way, the camshaft 14 itself moves in the axial direction of the adjusting screw 11a (left side in FIG. 4) by the action of the rolling roller 14a on the first roller plug 16 side when the parking brake is operated. The movement of the camshaft 14 is performed in the range of the gap in the guide 25a formed on the cap 25 described above. Further, the meshing position between the worm wheel 18 fixed to the camshaft 14 and the worm shaft 14 also moves from the initial meshing position a1 to a2 as shown in FIG.

  By driving the motor 26 as described above, the camshaft 14 can be moved in the axial direction of the adjusting spindle 11a. As a result, the adjusting spindle 11a can also be moved in the axial direction to operate the parking brake smoothly. it can. The parking brake is released by rotating the motor 26 in the reverse direction and returning the adjustment spindle 11a and the camshaft 14 to the initial positions by the return force of the spring 8.

  As described above, the example in which the adjust assembly is provided in the piston has been described as the embodiment according to the present invention. However, the adjust assembly is not always necessary, and the same effect can be obtained even if a simple spindle is used instead of the adjust spindle. Further, the cam surfaces formed on the camshaft and the first and second roller plugs can be appropriately employed at the time of designing as a cam surface suitable for obtaining a target braking force.

  Furthermore, the present invention can be implemented in any other form without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner.

  The present invention can be used as a disc brake with an electric parking function for a vehicle or the like.

It is sectional drawing of the whole principal part of the disc brake actuator with an electric parking function which concerns on this invention. It is a principal part disassembled perspective view of an electric parking mechanism part. It is an external appearance perspective view of the whole apparatus containing CC cross section in FIG. It is AA principal part sectional drawing of FIG. It is BB sectional drawing in FIG. It is EE sectional drawing in FIG. It is DD sectional drawing in FIG. It is a whole top view of the conventional disc brake operation device with a parking function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Caliper 2 Support 3, 4 Brake pad 5 Boot 6 Seal 7 Seal 8 Spring 9 Clip 10 Piston 10a Liquid chamber 10A Adjustment assembly 11 Rolling roller 11a Adjustment spindle 11b Adjustment sleeve 11c Bearing 11d Recess 12 Holder 14 Camshaft 14a Cam surface 14a Cam surface 15 Rolling roller 16 First roller plug 16a Convex portion 16b Cam surface 17 Housing 17a Concave portion 17b Gear case 18 Worm wheel 21 Second roller plug 21a Convex portion 21b Cam surface 22 Warm shaft 25 Cap 25a Guide 26 Motor 26a Output shaft CA Caliper assembly EP Electric parking mechanism

Claims (4)

In a disc brake with electric parking that can generate a parking brake force by a rotation / linear motion conversion type double roller lamp operated by a motor, the disc brake is slidably supported in the caliper and the caliper. A piston, an adjustment spindle mounted in the piston, and a rotation / linear motion conversion mechanism type double roller lamp disposed at an end of the adjustment spindle, wherein the rotation / linear motion conversion mechanism type double roller lamp is provided on the adjustment spindle; The first and second roller ramps arranged at the end, the camshaft arranged between the first and second roller ramps, and the rolling roller arranged between the first and second roller ramps and the camshaft. A worm wheel fixed to the camshaft, and the worm wheel A disc with an electric parking function, wherein the worm shaft is disposed in parallel with the adjustment spindle shaft and is attached to an output shaft of a motor disposed on the caliper side of the camshaft. brake. The disc brake with an electric parking function according to claim 1, wherein the camshaft to which the worm wheel is attached is held between the first and second roller ramps so as to be movable in the axial direction of the worm shaft. 3. The disc brake with an electric parking function according to claim 1, wherein the camshaft to which the worm wheel is fixed is configured to be guided and moved in a guide formed in a cap of a gear case. The disc brake with an electric parking function according to any one of claims 1 to 3, wherein an engagement point between the worm shaft and the worm wheel is configured to be shifted in an axial direction of the worm shaft.

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