JP2017109561A - Electric parking brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems in arrangement of an electric actuator in an electric parking brake device which pulls a brake cable extending from a brake unit with the electric actuator.SOLUTION: An electric parking brake device pulls a brake cable 11 extending from a brake unit 1 with an electric actuator 2. The electric actuator 2 is arranged in a trailing arm 31 of a wheel including the brake unit 1, and the brake cable 11 extending from the brake unit 1 to the electric actuator 2 is arranged along the trailing arm 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric parking brake device configured to pull a brake cable extending from a brake unit with an electric actuator.

  As can be seen from Patent Documents 1 to 3, the electric parking brake device has a configuration in which an electric actuator is incorporated in a brake unit itself included in a wheel and does not require a brake cable. However, Patent Document 4 or Patent Document As shown in FIG. 5, there are not a few configurations in which the brake cable extending from the brake unit is pulled by the electric actuator. Each brake unit is a disc brake or a drum brake. Usually, a brake unit incorporating an electric actuator has many disc brakes, and a brake unit that pulls a brake cable with an electric actuator has many drum brakes.

  In an electric parking brake device using a brake unit with a built-in electric actuator, a brake unit is assigned to each of the left and right wheels, and an operation signal is sent from the control device at the same time, thereby linking both brake units. On the other hand, the electric parking brake device that pulls the brake cable extending from the brake unit with the electric actuator, for example, by binding the brake cables extending from the left and right brake units with an equalizer, and pulling the brake cable extending from the equalizer with the electric actuator, Interlock both brake units.

  In an electric parking brake device that pulls a brake cable extending from a brake unit with an electric actuator, the electric actuator is disposed on a vehicle body that does not interfere with other members as a position away from the brake unit. Usually, when a brake unit is mounted on a rear wheel, an electric actuator is often arranged on the floor surface at the center of the vehicle body connecting the operating means and the rear wheel. The electric parking brake device disclosed in Patent Document 4 protects other members from the electric actuator that is displaced in the event of a rear collision, and prevents damage to the electric actuator from the rear side of the rear wheel provided with the brake unit. An electric actuator is partly arranged on the vehicle body.

JP 2013-092186 A JP 2012-229741 Japanese Patent Laid-Open No. 11-105680 JP 2007-321918 JP 59-140153 A

  An electric parking brake device using a brake unit with a built-in electric actuator has an advantage that there is no need to handle a brake cable. However, the configuration of the brake unit usually changes depending on the vehicle type and grade, and there is a problem of increasing the manufacturing cost. In contrast, an electric parking brake device that pulls the brake cable extending from the brake unit with an electric actuator can be used as a manual parking brake device if it is connected to the operating lever if the brake cable is lengthened. There is an advantage that the manufacturing cost can be reduced.

  However, in the case of an electric parking brake device in which brake cables extending from the left and right brake units are bundled with an equalizer and the brake cable extending from the equalizer is pulled with an electric actuator, the electric actuator is required to have a large size with high output. For this reason, it is difficult to select the location of the large electric actuator. In addition, a large electric actuator has a large driving sound, and it becomes more difficult to select an arrangement location in consideration of soundproofing measures. Therefore, in order to enable selection of electric and manual parking brake devices, an electric parking brake device in which the brake cable extending from the brake unit is pulled by the electric actuator, and the problem of the arrangement of the electric actuator was studied. .

  What has been developed as a result of the study is an electric parking brake device in which a brake cable extending from the brake unit is pulled by an electric actuator. The electric actuator is disposed on a wheel support member of a wheel including the brake unit, and the electric actuator is moved from the brake unit to the electric actuator. An electric parking brake device is characterized in that a brake cable extending up to is attached to a wheel support member. The wheel support member is, for example, a trailing arm, a lower arm or an upper arm, a cross member, a torsion beam, an axle, or the like that constitutes a suspension arm. To make the brake cable follow the wheel support member means that the brake cable is routed along the surface of the wheel support member. For example, the brake cable is passed through a clip provided on the surface of the suspension arm.

  By disposing the electric actuator on the wheel support member, naturally, the distance from the brake unit to the electric actuator is shortened, and a shorter brake cable is required than in the prior art. In addition, since the electric actuator arranged on the wheel support member moves up and down in synchronization with the brake unit provided on the front wheel or the rear wheel supported by the wheel support member, it is conventionally applied to the brake cable in consideration of the above vertical movement. The length of play that has been done becomes unnecessary. Thus, the brake cable is significantly shorter than before, and a small actuator with a small output can be used as the electric actuator for pulling the brake cable.

  The electric actuator can also link the left and right brake units by bundling the brake cables extending from the left and right brake units with an equalizer and pulling the brake cable extending from the equalizer, as in the prior art. However, if the electric actuator is assigned to each of the left and right wheels and arranged to the left and right on the wheel support member, and the left and right brake units are interlocked by sending the operation signal simultaneously from the control device installed on the vehicle body, The brake cable can be made shorter and the output required for the electric actuator can be reduced.

  According to the present invention, the problem of arrangement in the electric parking brake device in which the brake cable extending from the brake unit is pulled by the electric actuator is solved. Specifically, since the brake cable can be short, a small electric actuator having a small output is easily arranged on the wheel support member. Since the small electric actuator is lightweight, the weight balance of the wheel support member is not lost. Further, since the electric actuator is disposed on the wheel support member, the drive sound of the electric actuator does not become a problem.

  If the left and right wheels are assigned to the left and right wheels and the left and right electric actuators are arranged on the wheel support member, and the left and right brake units are linked by the control device, the brake cable can be shortened and the electric actuator can be made smaller. Thus, the above-described effects can be better enjoyed. In addition, since the left and right brake units can be individually controlled, the effect of the braking force is fed back, and even when there is a difference in the left and right braking forces, the pulling of the electric actuator differs depending on the left and right brake units, It is also possible to compensate for the difference in braking force. This is an effect that cannot be obtained with a conventional configuration in which brake cables extending from the left and right brake units are bundled with an equalizer.

1 is a block diagram illustrating an example of an electric parking brake device in which the present invention is applied to a rear tire. In the electric parking brake device of this example, it is a partial perspective view illustrating from the brake unit to the electric actuator. It is a block diagram showing the other example 1 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 2 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 3 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 4 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 5 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 6 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing the other example 7 of the electric parking brake device which applied this invention to the rear tire. It is a block diagram showing another example 8 of the electric parking brake device in which the present invention is applied to the rear tire. It is a block diagram showing another example 9 of the electric parking brake device in which the present invention is applied to the rear tire. FIG. 12 is a block diagram showing another example 10 of the electric parking brake device in which the present invention is applied to a rear tire.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the electric parking brake device according to the present invention is, for example, a rear tire 4 that is supported inside the left and right independent trailing arms 31, 31 constituting the suspension arm 3 as a wheel support member. , 4 is applied to each brake unit 1,1. The brake unit 1 of this example is a brake disc system in which a brake disc 41 that rotates in synchronization with the rear tire 4 is sandwiched between pads (not shown), and a brake 14 is used to exert a brake by pulling a lever 14 provided on the vehicle body side with a brake cable 11. To do.

  The brake unit 1 is supported by a brake unit support bracket 312 attached to the trailing arm 31 and moves up and down in synchronization with the trailing arm 31. The electric actuator is a direct acting type that pulls the brake cable 11, and is fixed to the inside of the vicinity of the middle of the front and rear of the trailing arm 31 that extends back and forth. A brake cable 11 extending from the brake unit 1 is connected to the electric actuator 2 through a clip 311 provided in the vicinity of the trailing end of the trailing arm 31.

  As described above, the brake unit 1, the electric actuator 2, and the brake cable 11 are all supported by the trailing arm 31 and move up and down in synchronization with the swinging of the trailing arm 31. For this reason, the play of the brake cable 11 which was necessary in consideration of the vertical movement of the brake unit 1 becomes unnecessary. The distance from the brake unit 1 to the electric actuator 2 is also short. Thus, the brake cable 11 necessary for the present invention is very short, and the electric actuator 2 for pulling the brake cable 11 can be small in size and small in output. The small electric actuator 2 does not impair the weight balance of the trailing arm 31.

  The electric actuator 2 is connected to the control device 21 by a signal line. The signal line is more flexible than the brake cable, and there are no restrictions on the handling, and the signal line does not affect the transmission / reception of the operation signal. In the control device 21 of this example, the left and right electric actuators 2 and 2 are independently connected, and the left and right electric actuators 2 and 2 can be individually operated or interlocked. The control device 21 is connected to the operation switch 22 by a signal line alone. The operation switch 22 is a push button operated by a driver with a finger, an operation lever operated by a hand, or a foot pedal operated by a foot.

  When the control device 21 receives the operation signal from the operation switch 22, the control device 21 transmits an operation signal to the left and right electric actuators 2 and 2 to operate the left and right brake units 1 and 1. At this time, the operation signals transmitted to the left and right electric actuators 2 and 2 are basically transmitted at the same and the same timing, and the same braking force is generated in the left and right brake units 1 and 1. For example, the control device 21 feeds back the braking state to generate different braking forces in the left and right brake units 1, 1, so that the operation signal transmission timing is shifted or the left and right electric actuators 2, 2 are operated. It is possible to transmit an activation signal that varies the time.

  The control device 21 that operates the brake units 1 and 1 receives the operation signal indicating that the operation of the operation switch 22 has been completed or the second operation has been performed, and transmits the operation signal to the left and right brake units 1 and 1. Or stop the operation signal and send a stop signal to the left and right brake units 1, 1 to stop the operation of the left and right brake units 1, 1 and release the braking state. The stop of the operation signal and the transmission of the stop signal are basically at the same timing as described above. However, when there is a difference in the braking force between the left and right brake units 1, 1, for example, at different timings, The decreasing tendency of the braking force due to the stop or the transmission of the stop signal may be made equal on the left and right.

  Since the brake unit 1 of this example operates by pulling the brake cable 11, the electric actuator 2 can be removed and used for a manual parking brake device. In the case of a manual parking brake device, the brake cable 11 connected to the electric actuator 2 is extended to the vehicle body side, the left and right brake cables 11 and 11 are bundled with an equalizer, and then the brake cable extending from the equalizer is connected to the driver. It is configured by connecting to an operation lever or foot pedal operated by. Thus, the electric parking brake device of the present invention has an advantage that the specification change to the manual parking brake device is easy.

  The present invention is applied to various suspension arms 3 in addition to the suspension arm 3 composed of the trailing arms 31.31 divided into left and right. For example, the present invention can be applied to the torsion beam type suspension arm 3 in which the left and right trailing arms 31 and 31 are connected by the torsion beam 32 as seen in another example 1 (FIG. 3) to another example 4 (FIG. 6). . In another example 1, the electric actuator 2 is arranged inside the trailing arm 31 as in the above example (see FIG. 1). In another example 2, the electric actuator 31 is disposed below the spring seat 313. In another example 3, the electric actuator 31 is disposed on the back of the torsion beam 32. In another example 4, the electric actuator 31 is disposed behind the shock absorber.

  Further, as seen in the other example 5 (FIG. 7) to the other example 7 (FIG. 9), the left and right trailing arms 31 and 31 and the torsion axle 34 are connected to the three-link suspension arm 3 via the link. The present invention can be applied. In another example 5, as in the above example (see FIG. 1), the electric actuator 2 is disposed inside the trailing arm 31. In another example 6, the electric actuator 31 is disposed below the spring seat 313. In another example 7, the electric actuator 31 is disposed behind the shock absorber.

  Further, as seen in the other example 8 (FIG. 10) to the other example 10 (FIG. 12), the rigid axle type suspension arm 3 in which the left and right trailing arms 31 and 31 are connected by the rigid axle 35 is also used in the present invention. The invention can be applied. In another example 8, as in the above example (see FIG. 1), the electric actuator 2 is disposed inside the trailing arm 31. In another example 9, the electric actuator 31 is disposed below the spring seat 313. In another example 10, the electric actuator 31 is disposed behind the shock absorber.

  The control procedure for causing the left and right brake units 1 and 1 to generate braking force by the electric parking brake device of the different examples 1 to 10 is the same as the above example (FIGS. 1 and 2). Moreover, the point which can be changed into a manual parking brake device by removing the electric actuators 2 and 2 and extending the brake cables 11 and 11 is the same as the above example (FIGS. 1 and 2). This means that the present invention can be applied regardless of the configuration of the suspension arm and can be changed to a manual parking brake device.

1 Brake unit
11 Brake cable
12 Lever 2 Electric actuator
21 Control unit
22 Operation switch 3 Suspension arm
31 Trailing arm
311 clips
312 Brake unit support bracket
313 Spring seat
32 Torsion beam
33 Shock absorber
34 Torsion axle
35 Rigid Axle 4 Rear Tire
41 Brake disc

Claims (2)

In the electric parking brake device that pulls the brake cable extending from the brake unit with the electric actuator,
An electric parking brake device, wherein the electric actuator is disposed on a wheel support member of a wheel including a brake unit, and a brake cable extending from the brake unit to the electric actuator is attached to the wheel support member. The electric actuator according to claim 1, wherein the electric actuator is assigned to each of the left and right wheels and arranged in a pair on the wheel support member, and the left and right brake units are interlocked by simultaneously sending an operation signal from a control device installed on the vehicle body. Parking brake device.

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