JP2014141983A - Method for assembling electric disc break gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a shaft misalignment between a drive shaft of an actuator assembly and a screw shaft of a caliper assembly at low cost, when assembling the actuator assembly with the caliper assembly.SOLUTION: An actuator assembly 10 is assembled with a caliper assembly 20 by a first step of combining a drive shaft 14 with a screw shaft 21a by being fitted coaxially and to enable torque transmission; a second step of temporarily fixing a first housing 13 and a second housing 23 in a movable state in the radial direction of the drive shaft 14 and the screw shaft 21a by temporarily fastening a fastening screw 30; a third step of holding a member corresponding to a disc rotor 40 with a predetermined force by driving a member corresponding to a friction pad 24 using power transmitted through a deceleration mechanism 12 and a screw mechanism 21 from an electric motor; and a fourth step of integrally fixing the first housing 13 and the second housing 23 by finally fastening the fastening screw 30.

Description

  The present invention relates to a method for assembling an electric disc brake device, and in particular, is configured such that a friction pad is driven by power transmitted from an electric motor via a speed reduction mechanism and a screw mechanism to sandwich a disc rotor. The present invention relates to a method for assembling an electric disc brake device.

  An electric disc brake device configured as described above is described in, for example, Patent Document 1 below. The electric disc brake device described in Patent Document 1 below has a first housing that supports an electric motor and a speed reduction mechanism (planetary gear mechanism), and is transmitted from the electric motor via the speed reduction mechanism. An actuator assembly having a drive shaft that is driven to rotate by power, and a second housing that supports the screw shaft of a screw mechanism (mechanism for converting rotation into axial movement) so that the screw shaft can rotate but cannot move in the axial direction. A caliper assembly configured such that the friction pad is driven by the power transmitted through the screw mechanism and the disc rotor is sandwiched between the first housing and the second housing, The drive shaft and the screw shaft are fitted coaxially and so as to be able to transmit torque.

JP 2006-183723 A

  In the electric disc brake device described in Patent Document 1 above, the drive shaft in the actuator assembly and the screw shaft misalignment in the caliper assembly (misalignment of the shaft centers) cause the manufacturing accuracy and assembly accuracy of the component parts alone. Is influenced by. By the way, when the above-described shaft misalignment occurs, an offset load is generated in the speed reduction mechanism (planetary gear mechanism) or the screw mechanism, and the power transmission efficiency in the speed reduction mechanism (planetary gear mechanism) or the screw mechanism may be reduced. There is. The above-described axial deviation can be reduced by increasing the production accuracy and assembly accuracy of the component parts alone. However, in order to increase the production accuracy and assembly accuracy of a single component, the cost increases due to an increase in processing time and assembly time.

The present invention has been made to solve the above problems,
It is an assembly method of an electric disc brake device configured such that a friction pad is driven by power transmitted from an electric motor via a speed reduction mechanism and a screw mechanism, and the disc rotor is clamped.
An actuator assembly having a first housing that supports the electric motor and the speed reduction mechanism, and having a drive shaft that is rotationally driven by power transmitted from the electric motor via the speed reduction mechanism, and a screw of the screw mechanism It has a second housing that supports the shaft so that it can rotate and cannot move in the axial direction, and is a member corresponding to the friction pad by the power transmitted through the screw mechanism (even the friction pad itself, A member corresponding to the disk rotor (which may be the disk rotor itself or the disk rotor) may be clamped by driving a friction pad (which may replace the friction pad). A first step of combining the caliper assembly with each other by fitting the drive shaft and the screw shaft coaxially and capable of transmitting torque;
After this first step, the first housing and the second housing are temporarily fixed in a state in which they can move in the radial direction of the drive shaft and the screw shaft by temporarily fastening a fastening screw. Process,
After the second step, a member corresponding to the friction pad is driven with a predetermined force by driving a member corresponding to the friction pad by power transmitted from the electric motor via the speed reduction mechanism and the screw mechanism. A third step of
After the third step, a fourth step of fixing the first housing and the second housing integrally by tightening the fastening screw.
Have

  In the assembly method of the electric disc brake device according to the present invention described above, it is possible to generate a desired axial force in the screw mechanism by executing the third step, and it is possible to center the screw shaft in the screw mechanism by the coaxial force. It is. Further, along with the centering of the screw shaft, the drive shaft is centered and a self-aligning action is obtained by the speed reduction mechanism. In addition, the state after the third step (the state where the screw shaft and the drive shaft are centered and the speed reduction mechanism is automatically aligned) is maintained (maintained) by executing the fourth step.

  Therefore, in the present invention, it is possible to reduce the axial deviation between the screw shaft and the drive shaft at a low cost without increasing the manufacturing accuracy and assembly accuracy of the component parts alone. Therefore, in the present invention, it is possible to reduce the loss of power transmission efficiency in the speed reduction mechanism and the screw mechanism at a low cost, and the actuator assembly (electric motor, speed reduction mechanism, first housing, etc.) can be reduced in size. Weight reduction is also possible.

  In the implementation of the present invention described above, when the drive shaft and the screw shaft are fitted in the first step, the drive shaft may be rotated by the electric motor. In this case, the rotational phase of the drive shaft and the screw shaft (the rotational position when the drive shaft and the screw shaft are fitted) can be easily matched, and the assembly time required for the first step can be shortened. Is possible.

  In carrying out the above-described present invention, the member corresponding to the disk rotor is clamped with a predetermined force by the member corresponding to the friction pad when the fourth step is executed (when the third step is executed). It is also possible to maintain the driving state of the electric motor in the same manner as in FIG. In this case, the centering action of the screw shaft and the drive shaft and the self-aligning action of the speed reduction mechanism can be obtained even during the execution of the fourth step, so that the misalignment of the screw shaft and the drive shaft can be regenerated. It is possible to prevent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of an electric disc brake device capable of implementing an electric disc brake device assembling method according to the present invention. FIG. 2 is a central longitudinal side view of the electric disc brake device shown in FIG. 1. It is a center longitudinal cross-sectional side view for demonstrating the 1st process at the time of the assembly | attachment of the electric disc brake device shown in FIG. It is a center longitudinal cross-sectional side view for demonstrating the 3rd process and 4th process implemented after the 2nd process at the time of the assembly | attachment of the electric disc brake device shown in FIG. It is a front view of the planetary gear mechanism shown in FIGS. FIG. 6 is a right side view of the planetary gear mechanism shown in FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a movable caliper type electric disc brake device 100 capable of implementing the electric disc brake device assembling method according to the present invention. The electric disc brake device 100 is a regular and parking brake device, and includes an actuator assembly 10, a caliper assembly 20, and a pair of fastening screws 30.

  As shown in FIGS. 1 and 2, the actuator assembly 10 has an actuator housing (first housing) 13 that supports the electric motor 11 and the speed reduction mechanism 12, and is transmitted from the electric motor 11 through the speed reduction mechanism 12. It has the drive shaft 14 rotated by the motive power. The electric motor 11 is arranged in parallel with the planetary gear mechanism 12 a of the speed reduction mechanism 12. The speed reduction mechanism 12 includes a planetary gear mechanism 12a and a gear train 12b.

  The planetary gear mechanism 12a has a sun gear 12a1 as an input element, a planet carrier 12a2 as an output element, and a ring gear 12a3 as a fixed element, as schematically shown in an enlarged manner in FIGS. As shown in FIG. 2, the actuator housing 13 is disposed coaxially with the drive shaft 14. Note that four planetary gears 12a4 are assembled to the planet carrier 12a2. Each planetary gear 12a4 meshes with the sun gear 12a1 and the ring gear 12a3.

  The gear train 12b transmits the rotational driving force of the electric motor 11 to the sun gear 12a1 of the planetary gear mechanism 12a, and an input gear (not shown) integrally assembled with the output shaft (not shown) of the electric motor 11. An output gear 12b1 (see FIG. 2) coaxially assembled with the sun gear 12a1, and an intermediate gear disposed between the input gear (not shown) and the output gear 12b1 and rotatably supported by the actuator housing 13 (Not shown). The drive shaft 14 is integrally assembled with the shaft center portion of the planet carrier 12a2, and an outer spline 14a (see FIG. 6) is formed on the outer periphery of the tip portion (the right end portion in FIGS. 2 and 6). .

  The caliper assembly 20 includes a screw mechanism 21 that converts rotation of the drive shaft 14 into axial movement, a movable caliper (second housing) 23 that supports the screw mechanism 21 and the piston 22, and a pair of friction pads 24. It has the mounting 25 which supports (an inner pad and an outer pad). The screw mechanism 21 is assembled coaxially with the piston 22 and includes a screw shaft 21a and a nut member 21b.

  The screw shaft 21a is supported by the movable caliper 23 so as to be rotatable and non-movable in the axial direction, and an inner spline 21a1 into which the outer spline 14a of the drive shaft 14 can be splined is formed on the left end axis of FIG. A clip 26 is assembled on the outer periphery of the left end of FIG. The nut member 21 b is disposed between the screw shaft 21 a and the piston 22, and is configured to be able to be taper fitted (coaxially contactable) with the piston 22. Since the configuration of the piston 22, the movable caliper (second housing) 23, the pair of friction pads 24, the mounting 25, and the like are well known, detailed description thereof is omitted.

  By the way, in this embodiment, the actuator assembly 10 and the caliper assembly 20 are integrally assembled using a pair of fastening screws 30 through the first to fourth steps of the assembly method described in detail below. It has been. In this embodiment, the actuator housing (first housing) 13 is provided with a cylindrical actuator inlay portion 13a, and the movable caliper (second housing) 23 is provided with a cylindrical caliper inlay portion 23a. A seal ring (O-ring) 27 is assembled to the caliper row portion 23a.

  The seal ring (O-ring) 27 is configured to be interposed between the actuator inlay portion 13a and the caliper inlay portion 23a when the actuator assembly 10 and the caliper assembly 20 are assembled together. The seal ring (O-ring) 27 can be elastically deformed between the actuator inlay portion 13a and the caliper inlay portion 23a. Due to the elastic deformation, the actuator inlay portion 13a (first housing) and the caliper inlay portion 23a (first 2 housing) is movable in the radial direction of the drive shaft 14 and the screw shaft 21a.

  In the first step of the assembling method in this embodiment, the actuator assembly 10 and the caliper assembly 20 are fitted through the state shown in FIG. 3 so that the drive shaft 14 and the screw shaft 21a can be coaxially and transmit torque. It is a process of combining by combining. In this first step, the outer spline 14a of the drive shaft 14 and the inner spline 21a1 of the screw shaft 21a are spline-fitted, and the actuator inlay portion 13a and the caliper inlay portion 23a are fitted through a seal ring (O-ring) 27. Combined.

  In the first step, when the drive shaft 14 and the screw shaft 21 a are fitted, the drive shaft 14 can be rotated by the electric motor 11. In this case, the rotational phase of the drive shaft 14 and the screw shaft 21a (the rotational position when the drive shaft 14 and the screw shaft 21a are fitted) can be easily matched, and the assembly required for the first step Time can be shortened.

  In the second step of the assembling method in this embodiment, the actuator housing (first housing) 13 and the movable caliper (second housing) 23 are temporarily tightened with the pair of fastening screws 30 after the first step. By this, it is the process of temporarily fixing in the state which can move in the radial direction of the drive shaft 14 and the screw shaft 21a.

  Further, in the third step of the assembling method, power transmitted from the electric motor 11 through the speed reduction mechanism 12, the screw mechanism 21, the piston 22 and the like (actuate the electric motor 11 by energization) after the second step described above. A member corresponding to the friction pad 24 (which may be the friction pad itself or a substitute for the friction pad) is driven in the axial direction of the disk rotor 40 by the drive force obtained by This is a step (see FIG. 4) of clamping a corresponding member (which may be the disc rotor itself or a substitute for the disc rotor) with a predetermined force.

  After the third step, the fourth step of fixing the actuator housing (first housing) 13 and the movable caliper (second housing) 23 integrally by fastening the pair of fastening screws 30 is performed. As a result, the assembly of the actuator assembly 10 and the caliper assembly 20 is completed.

  In the assembling method of this embodiment described above, it is possible to generate a desired axial force on the screw mechanism 21 by executing the above-described third step, and it is possible to center the screw shaft 21a in the screw mechanism 21 by a coaxial force. It is. Further, as the screw shaft 21 a is centered, the drive shaft 14 is centered, and the planetary gear mechanism 12 a of the speed reduction mechanism 12 provides an automatic alignment action. In addition, the state after the third step (the state where the screw shaft 21a and the drive shaft 14 are centered and the planetary gear mechanism 12a of the speed reduction mechanism 12 is automatically aligned) is maintained (maintained) by executing the fourth step. The

  The actuator housing (first housing) 13 is moved to the movable caliper (second housing) 23 when the drive shaft 14 is centered and the planetary gear mechanism 12a of the speed reduction mechanism 12 provides an automatic alignment action. On the other hand, when moving in the radial direction of the screw shaft 21a and the drive shaft 14, the seal ring (O-ring) 27 is elastically deformed between the actuator inlay portion 13a and the caliper inlay portion 23a.

  Therefore, in this embodiment, the axial deviation between the screw shaft 21a and the drive shaft 14 can be reduced at a low cost without increasing the manufacturing accuracy and assembly accuracy of the component parts alone. For this reason, in this embodiment, it is possible to reduce the loss of power transmission efficiency in the speed reduction mechanism 12 and the screw mechanism 21 at low cost, and the actuator assembly 10 (the electric motor 11, the speed reduction mechanism 12, the first speed). The housing 13 and the like) can be reduced in size and weight.

  At the time of execution of the above-described fourth step, a member corresponding to the disk rotor 40 is sandwiched with a predetermined force by a member corresponding to the friction pad 24 (the driving state of the electric motor 11 as in the case of execution of the third step). Is also possible). In this case, the centering action of the screw shaft 21a and the drive shaft 14 and the self-aligning action of the planetary gear mechanism 12a in the speed reduction mechanism 12 are also obtained in the execution of the fourth step, and the screw shaft 21a and the drive shaft 14 are obtained. It is possible to accurately prevent the axis misalignment from recurring.

  In the electric disc brake device 100 described above, when used as a service brake, the brake force generated by the driving force of the electric motor 11 cannot be obtained, and the hydraulic chamber R formed between the movable caliper 23 and the piston 22 is used. It is set so that only the braking force by the hydraulic pressure supplied to can be obtained. In the electric disc brake device 100 described above, when used as a parking brake, the brake force due to the hydraulic pressure cannot be obtained, and only the brake force due to the driving force of the electric motor 11 is obtained. ing.

  In the above embodiment, the drive shaft 14 is set to be rotated by the electric motor 11 when the drive shaft 14 and the screw shaft 21a are fitted in the first step. It is also possible to carry out the setting so that the motor is not rotated by the electric motor 11. In the above-described embodiment, the electric motor 11 is driven and the member corresponding to the disc rotor 40 is sandwiched by the member corresponding to the friction pad 24 with a predetermined force even when the fourth step is executed. Although set and implemented, it is also possible to perform the setting so that the driving of the electric motor 11 is stopped when the fourth step is executed.

  In the above-described embodiment, the actuator housing (first housing) 13 and the movable caliper (second housing) 23 are configured to be fixed by a pair of fastening screws 30, but the actuator housing ( The number of fastening screws (30) for fixing the first housing (13) and the movable caliper (second housing) 23 can be set as appropriate, and can be one or three or more. .

DESCRIPTION OF SYMBOLS 10 ... Actuator assembly, 11 ... Electric motor, 12 ... Reduction mechanism, 12a ... Planetary gear mechanism, 12b ... Gear train, 13 ... Actuator housing (first housing), 14 ... Drive shaft, 20 ... Caliper assembly, 21 ... Screw mechanism, 21a ... screw shaft, 21b ... nut member, 22 ... piston, 23 ... movable caliper (second housing), 24 ... friction pad (inner pad and outer pad), 25 ... mounting, 26 ... clip, 27 ... seal ring (O-ring), 30 ... Fastening screw, 40 ... Disc rotor, 100 ... Electric disc brake device, R ... Hydraulic chamber

Claims (3)

It is an assembly method of an electric disc brake device configured such that a friction pad is driven by power transmitted from an electric motor via a speed reduction mechanism and a screw mechanism, and the disc rotor is clamped.
An actuator assembly having a first housing that supports the electric motor and the speed reduction mechanism, and having a drive shaft that is rotationally driven by power transmitted from the electric motor via the speed reduction mechanism, and a screw of the screw mechanism It has a second housing that supports the shaft so that it can rotate and cannot move in the axial direction, and a member corresponding to the friction pad is driven by the power transmitted through the screw mechanism and corresponds to the disk rotor. A first step of combining a caliper assembly configured to hold a member to be clamped by fitting the drive shaft and the screw shaft coaxially and capable of transmitting torque;
After this first step, the first housing and the second housing are temporarily fixed in a state in which they can move in the radial direction of the drive shaft and the screw shaft by temporarily fastening a fastening screw. Process,
After the second step, a member corresponding to the friction pad is driven with a predetermined force by driving a member corresponding to the friction pad by power transmitted from the electric motor via the speed reduction mechanism and the screw mechanism. A third step of
After the third step, a fourth step of fixing the first housing and the second housing integrally by tightening the fastening screw.
A method of assembling an electric disc brake device having In the assembly method of the electric disc brake device according to claim 1,
The electric disc brake device assembling method, wherein the drive shaft is rotated by the electric motor when the drive shaft and the screw shaft are fitted in the first step. In the assembly method of the electric disc brake device according to claim 1 or 2,
A method of assembling an electric disc brake device, wherein the member corresponding to the disc rotor is clamped by a member corresponding to the friction pad with a predetermined force when the fourth step is executed.

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