JP4451165B2 - Brake device for vehicle - Google Patents

Description

  The present invention relates to a vehicle brake device.

An example of a vehicle brake device mounted on a saddle-ride type vehicle, a so-called buggy vehicle, is disclosed in Patent Document 1.
In the conventional brake device used in a vehicle including the saddle-ride type vehicle as described above, the relationship between the brake operation amount and the braking force is the same when the vehicle is moving forward and when the vehicle is moving backward.
Japanese Patent Laid-Open No. 11-170989

  As described above, the relationship between the brake operation amount and the braking force is the same when the vehicle is moving forward and when the vehicle is moving backward. However, because the reverse is different in speed from the forward movement, the braking force is not necessarily the same as the forward direction. There is no need.

  Accordingly, an object of the present invention is to provide a vehicular brake device that has a braking force different from that during forward braking during backward braking.

In order to achieve the above object, the invention according to claim 1 is directed to a vehicle brake device (for example, the brake device 22 in the embodiment) that generates braking force on wheels (for example, the wheels 12F and 12R in the embodiment) by a brake operation. ) comprising: a braking force to the brake operation amount, have a control means for performing braking force control for controlling low during reverse travel of the vehicle (braking force control device 38 in the example embodiment) with respect to time of forward movement of the vehicle, the brake A master cylinder (for example, the front master cylinder 27 in the embodiment) that generates hydraulic pressure by operation and a caliper (for example, the front caliper 28 in the embodiment) that generates braking force on the wheels by the introduced hydraulic pressure. The control means brakes the master cylinder and the caliper when the vehicle reverses. While communicating with a hydraulic pressure control valve (for example, the hydraulic pressure control valve 41 in the embodiment) for changing the braking force against the vehicle to a low level, the master cylinder and the caliper are connected via the hydraulic pressure control valve when the vehicle moves forward. The control means is a drive system member (for example, the propeller shaft 44 in the embodiment) that has a switching valve (for example, the switching valve 40 in the embodiment) that communicates without moving, and that normally rotates when the vehicle moves forward and reverses when the vehicle moves backward. The switching valve is switched by the hydraulic pressure of a pump to be driven (for example, the pump 45 in the embodiment) .

According to a second aspect of the present invention, in the first aspect of the invention, the control unit is configured to connect the discharge side and the suction side of the pump at the time of the forward rotation of the drive system member (for example, the implementation of the circulation flow path). A one-way valve (for example, one-way valve 49 in the embodiment) provided on the circulation passage and allowing only a liquid flow from the discharge side to the suction side, A connection flow path (for example, connection flow path 51 in the embodiment) for connecting the downstream side of the one-way valve of the circulation flow path and the switching valve at the time of the forward rotation of the drive system member. The switching valve is switched by the hydraulic pressure introduced through the flow path.

The invention according to claim 3 is a vehicle brake device (for example, the brake device 22 in the embodiment) that generates a braking force on a wheel (for example, the wheels 12F and 12R in the embodiment) by a brake operation, and the brake operation amount. And a control means (for example, the braking force control device 38 in the embodiment) for controlling the braking force with respect to the vehicle to a lower level when the vehicle moves backward than when the vehicle moves forward, and a master that generates hydraulic pressure by a brake operation. A cylinder (for example, the front master cylinder 27 in the embodiment) and a caliper (for example, the front caliper 28 in the embodiment) for generating a braking force on the wheel by the introduced hydraulic pressure, and the control means is a vehicle When the vehicle is moving backward, the master cylinder and the caliper have a lower braking force with respect to the brake operation amount. A switching valve that communicates via a hydraulic pressure control valve (for example, the hydraulic pressure control valve 41 in the embodiment), and communicates the master cylinder and the caliper without going through the hydraulic pressure control valve when the vehicle moves forward. (For example, the switching valve 40 in the embodiment), and the control means is a worm gear (for example, a propeller shaft 44 in the embodiment) that rotates forward when the vehicle moves forward and reverses when the vehicle moves backward (for example, the propeller shaft 44 in the embodiment). A worm gear 59) in the embodiment, and a rocking member (for example, the rocking member 62 in the embodiment) that rocks when the worm gear meshes with the normal rotation and reverse rotation of the worm gear. The switching valve is switched by swinging a member.
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the control means performs the braking force control only on the front wheels.

  According to the first aspect of the present invention, the control means performs the braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle is moving backward than when the vehicle is moving forward. The braking force with respect to the brake operation amount can be controlled more comfortably and easily.

Further , during forward braking of the vehicle, the switching valve directly controls the braking force with respect to the brake operation amount by directly transmitting the hydraulic pressure generated by the brake operation from the master cylinder to the caliper without passing through the hydraulic pressure control valve. On the other hand, at the time of reverse braking of the vehicle, the switching valve transmits the hydraulic pressure generated by the brake operation from the master cylinder to the caliper via the hydraulic control valve so that the hydraulic control valve can provide the braking force with respect to the brake operation amount. More comfortable and easier to control. Thus, since it is the structure which provides a switching valve and a hydraulic-pressure control valve between a master cylinder and a caliper, an increase in cost can be suppressed in a hydraulic apparatus.

Further , the switching valve is switched by the difference between the hydraulic pressure when the drive system member rotates forward and the pump rotates forward when the vehicle moves forward and the hydraulic pressure when the drive system member reverses and the pump reverses when the vehicle moves backward. Thus, the switching valve can be switched by utilizing the fact that the rotation direction of the drive system member reverses during forward / backward travel. Therefore, an increase in cost can be suppressed.

According to the second aspect of the present invention, when the drive system member rotates in the forward direction and the pump rotates in the forward direction when the vehicle moves forward, the one-way valve allows the flow of the liquid in the circulation flow path. The suction side is in communication with the circulation channel, and the discharge fluid pressure of the pump does not operate the switching valve. On the other hand, when the drive system member reverses and the pump reverses when the vehicle reverses, the one-way valve regulates the flow of the liquid in the circulation flow path, so that the liquid pressure from the discharge side of the pump passes through the connection flow path to the switching valve. It will be introduced to operate the switching valve. In this way, the switching valve is switched by the difference in hydraulic pressure between the normal rotation and the reverse rotation of the pump due to the normal rotation and reverse rotation of the drive system member, and the switching valve can be switched with a simple configuration. Therefore, an increase in cost can be further suppressed.

According to the invention of claim 3 , when the drive system member rotates forward and the worm gear rotates forward when the vehicle advances, and when the drive system member reverses and the worm gear reverses when the vehicle moves backward. The switching valve is switched depending on the difference between the swinging member and the switching valve can be switched by utilizing the fact that the rotation direction of the drive system member reverses during forward / backward travel. Therefore, an increase in cost can be suppressed.

According to the fourth aspect of the present invention, when the control means performs the braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle is moving backward than when the vehicle is moving forward, Since only this braking force control is performed, the configuration can be simplified as compared with the case where it is performed on the front and rear wheels. In addition, since the braking force to be generated is applied to the front wheels, the braking force control can be performed more effectively than when only the rear wheels are used. Therefore, it is possible to control the vehicle comfortably at a low cost without causing a sense of incongruity such as rocking back during reverse braking.

  According to the eighth aspect of the present invention, the switching valve is switched by the difference in hydraulic pressure generated by the sub master cylinder depending on the difference between the caliper swing position when the vehicle moves forward and the caliper swing position when the vehicle moves backward. be able to. Therefore, an increase in cost can be further suppressed.

  A vehicle brake device according to a first embodiment of the present invention will be described below with reference to FIGS. In the following description, front, rear, left, and right are front, rear, left, and right in the traveling direction when the vehicle moves forward.

  FIG. 1 is a perspective view showing a saddle-ride type vehicle (so-called buggy vehicle), which is a vehicle to which a vehicle brake device (hereinafter referred to as a brake device) according to the present embodiment is applied, specifically for rough terrain travel. FIG.

This saddle-ride type vehicle 11 includes a power unit 15 having wheels 12F disposed on the left and right of the front side of the vehicle body, wheels 12R disposed on the left and right of the rear side, and an engine 13 and a transmission 14 mounted substantially at the center of the vehicle body. A handlebar 16 that extends in the left-right direction at the front upper portion of the vehicle body and receives steering of the front wheel 12F, a headlight unit 17 supported by the handlebar 16, and a rear of the handlebar 16. It has a fuel tank 18 provided on the side, a seat 19 provided on the rear side of the fuel tank 18, and a vehicle body cover 20 made of resin. The saddle riding type vehicle 11 is a so-called vertical type in which a crankshaft (not shown) of the engine 13 extends in the front-rear direction, and drives the front wheels 12F and the rear wheels 12R via a propeller shaft parallel to the crankshaft. It is a four-wheel drive vehicle.
In the present embodiment, the vehicle travels at a lower speed during forward reverse than during forward travel.

  The saddle riding type vehicle 11 is provided with the brake device 22 of the first embodiment shown in FIG.

  The brake device 22 is divided into a front brake device 23 that brakes the left and right front wheels 12F and a rear brake device 24 that brakes the left and right rear wheels 12R.

  The front brake device 23 is swingably supported on the front right side of the handlebar 16 and is gripped with a right hand by the driver, and a brake fluid pressure is applied by a brake operation by the driver to the brake lever. A front master cylinder 27 that generates a braking force, a front caliper 28 that generates a braking force on the front wheel 12F by the introduced hydraulic pressure, and a hydraulic pressure passage 30 that connects the front master cylinder 27 and the front caliper 28. .

  The rear brake device 24 is provided on a right foot so as to be swingable and is depressed by a driver to be depressed, and a rear master that generates brake fluid pressure by a brake operation by the driver on the brake pedal. It has a cylinder 32, a rear brake main body 33 that generates braking force on the rear wheel 12R by the introduced hydraulic pressure, and a hydraulic pressure passage 34 that connects the rear master cylinder 32 and the rear brake main body 33.

  Here, the front caliper 28 generates a braking force on the wheel by gripping the disk rotor rotating integrally with the wheel from both sides in the axial direction.

  In the brake device 22 according to the first embodiment, only the front brake device 23 described above performs a braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle moves backward than when the vehicle moves forward. A control device (control means) 38 is provided. The braking force control device 38 will be described.

  The braking force control device 38 has a switching valve 40 provided in the hydraulic pressure passage 30 and a hydraulic pressure control valve 41 connected to the switching valve 40, and the switching valve 40 controls the front master cylinder 27 with hydraulic pressure. A normal state in which the front caliper 28 is directly connected to the control valve 41 without communicating with the control valve 41, and a switching state in which the front master cylinder 27 is in communication with the hydraulic pressure control valve 41 and is connected to the front caliper 28 via the hydraulic pressure control valve 41. Can be switched between.

  Here, the hydraulic pressure control valve 41 is a so-called proportioning valve, and while the brake operation amount shown by the solid line in FIG. 3 is smaller than the predetermined value X, the braking force (brake effectiveness) increases with respect to the unit amount increase of the brake operation amount. When the amount is set to a predetermined value and the brake operation amount is equal to or greater than the predetermined value X, the amount of increase in the braking force with respect to the unit amount increase of the brake operation amount is smaller than the predetermined value X as shown by a one-dot chain line in FIG. The change control is performed so as to be smaller than the case.

  Therefore, in a normal state where the switching valve 40 does not allow the front master cylinder 27 to communicate with the hydraulic pressure control valve 41, the brake operation amount becomes equal to or greater than the predetermined value X before the brake operation amount indicated by the solid line in FIG. Even if it becomes, as shown with the broken line in FIG. 3, it is set as the big fixed ratio with which the braking force with respect to the amount of brake operation does not change.

  On the other hand, in the switching state in which the switching valve 40 causes the front master cylinder 27 to communicate with the hydraulic pressure control valve 41, before the braking operation amount indicated by the solid line in FIG. However, when the brake operation amount becomes equal to or greater than the predetermined value X, the control is changed so that the ratio of the braking force to the same brake operation amount is lower than the above, as shown by a one-dot chain line in FIG.

  The braking force control device 38 switches the switching valve 40 so that the front master cylinder 27 and the front caliper 28 are communicated with each other via the hydraulic pressure control valve 41 when the vehicle moves backward, while the front master cylinder when the vehicle moves forward. 27 and the front caliper 28 are connected to each other without the hydraulic control valve 41.

  The switching valve control unit 43 is provided on a front or rear propeller shaft (drive system member) 44 that extends forward or rearward to drive the front wheel or rear wheel from the transmission 14, and rotates forward when the vehicle moves forward. A pump 45 that is driven by the front or rear propeller shaft 44, which is sometimes reversed, sucks and discharges hydraulic fluid, and a first flow port 46 on the discharge side of the pump 45 when the front or rear propeller shaft 44 rotates forward. A circulation channel 48 communicating with the second circulation port 47 on the suction side, and a first circulation port on the discharge side of the pump 45 provided on the circulation channel 48 when the front or rear propeller shaft 44 rotates forward. A one-way valve 49 that allows only the flow of hydraulic fluid (hydraulic fluid) from 46 to the second circulation port 47 on the suction side, and the front or rear And a connecting passage 51 which connects the downstream connection point 50 and the switching valve 40 of the one-way valve 49 in the circulation flow path 48 at the time of forward rotation of the propeller shaft 44.

  The switching valve control unit 43 is connected to the junction 52 of the circulation flow path 48 between the first flow port 46 on the discharge side of the pump 45 and the one-way valve 49 when the front or rear propeller shaft 44 is rotated forward. A relief flow path 54 connecting the branch point 53 in the middle of the flow path 51, a relief valve 55 provided in the relief flow path 54 and opened when the pressure of the connection flow path 51 rises to a predetermined value or more, and a circulation flow A sealed reservoir 56 is connected to the junction 52 of the channel 48 and absorbs excess and deficient liquids.

  2, when the front or rear propeller shaft 44 rotates forward and the pump 45 rotates forward, the pump 45 sucks the hydraulic fluid from the second flow port 47 and performs the first flow as shown in FIG. The one-way valve 49 allows the working fluid to flow in the circulation flow path 48, and the pump 45 at this time has a first flow port 46 on the discharge side and a second flow port on the suction side. 47 communicates with each other through the circulation channel 48. As a result, the hydraulic fluid is circulated in the circulation flow path 48 by the pump 45, and the switching valve 40 is not operated, and the switching valve 40 is set to the normal state described above. Thus, when the brake lever is operated while the vehicle is traveling forward, the front brake device 23 operates the front caliper 28 as it is with the hydraulic pressure from the front master cylinder 27. FIG. The braking force with respect to the relationship between the solid line and the broken line shown in FIG.

  On the other hand, as shown in FIG. 4, when the front or rear propeller shaft 44 is reversed and the pump 45 is reversed, the pump 45 sucks the hydraulic fluid from the first flow port 46 and discharges it from the second flow port 47. When the one-way valve 49 restricts the flow of the hydraulic fluid in the circulation channel 48, the hydraulic fluid from the second circulation port 47 on the discharge side of the pump 45 is introduced into the switching valve 40 via the connection channel 51. The switching valve 40 is operated to enter the switching state described above. Accordingly, when the brake lever is operated while the vehicle is traveling backward, the front brake device 23 does not operate the hydraulic pressure control valve 41 in the state where the brake operation amount is less than the predetermined value X. The front caliper 28 is operated as it is with the hydraulic pressure from the master cylinder 27, and the braking force with respect to the relationship of the solid line shown in FIG.

  In addition, when the vehicle is traveling backward, a brake operation is performed on the brake lever, and when the amount of brake operation exceeds a predetermined value X, the front brake device 23 controls the hydraulic pressure from the front master cylinder 27 to the hydraulic pressure control valve 41. The braking force control for operating the front caliper 28 with the reduced hydraulic pressure is performed, and the relationship of the one-dot chain line shown in FIG. 2, that is, the braking force with respect to the brake operation amount is compared with that during forward braking. Decrease to generate an appropriate braking force in response to reverse braking.

  Here, after the switching valve 40 is switched via the connection flow path 51, the discharge pressure of the pump 45 is returned to the suction side of the pump 45 via the relief valve 55 and the relief flow path 54, which is necessary. The above hydraulic pressure is not applied to the switching valve 40.

  According to the brake device 22 of the first embodiment described above, the braking force control device 38 performs the braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle moves backward than when the vehicle moves forward. During reverse travel where the speed is set low, the braking force with respect to the brake operation amount can be appropriately suppressed. Therefore, even during reverse braking, the vehicle can be comfortably controlled without feeling uncomfortable such as swinging back.

  Further, when the braking force control device 38 performs the braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle moves backward than when the vehicle moves forward, this braking force is applied only to the front wheel 12F that generates a large braking force. Since the control is performed, the configuration can be simplified compared to the case where the control is performed on the front and rear wheels 12F and 12R. Moreover, since the braking force to be generated is applied to the front wheel 12F, the braking force control can be effectively performed as compared with the case where the braking force is applied only to the rear wheel 12R. Therefore, it is possible to effectively prevent the occupant from feeling uncomfortable such as swinging back during reverse braking effectively at low cost. Except for this point, the braking force control described above can be performed only on the rear wheel 12R. Of course, the braking force control described above can be performed on both the front wheels 12F and the rear wheels 12R.

  In addition, at the time of forward braking of the vehicle, the switching valve 40 directly transmits the hydraulic pressure generated by the brake operation from the front master cylinder 27 to the front caliper 28 without passing through the hydraulic pressure control valve 41. On the other hand, at the time of reverse braking of the vehicle, the switching valve 40 transmits the hydraulic pressure from the front master cylinder 27 generated by the brake operation to the front caliper 28 via the hydraulic pressure control valve 41. Thus, the hydraulic pressure control valve 41 lowers the braking force with respect to the brake operation amount compared to the forward braking. As described above, since the switching valve 40 and the hydraulic pressure control valve 41 are provided between the front master cylinder 27 and the front caliper 28, it is possible to further suppress an increase in cost in the hydraulic brake device 22.

  Further, the switching valve control unit 43 causes the front or rear propeller shaft 44 to rotate forward when the vehicle advances, and the front or rear propeller shaft 44 reversely rotates when the vehicle moves backward. The switching valve 40 is switched depending on the difference in hydraulic pressure when 45 is reversed. That is, when the front or rear propeller shaft 44 rotates forward and the pump 45 rotates forward when the vehicle moves forward, the one-way valve 49 allows the liquid to flow in the circulation flow path 48, so that The suction side is communicated with the circulation channel 48, and the discharge fluid pressure of the pump 45 does not operate the switching valve 40. On the other hand, when the propeller shaft 44 of the front or rear is reversed and the pump 45 is reversed when the vehicle is moving backward, the one-way valve 49 restricts the flow of the liquid in the circulation passage 48 so that the hydraulic pressure from the discharge side of the pump 45 is connected. The switching valve 40 is operated by being introduced into the switching valve 40 through the flow path 51. In this way, the switching valve 40 can be switched by utilizing the fact that the rotational direction of the front or rear propeller shaft 44 is reversed during forward and backward travel. Therefore, an increase in cost can be further suppressed.

  Next, the brake device of 2nd Embodiment of this invention is demonstrated below centering on a different part from 1st Embodiment with reference to FIG. 5 and FIG. In addition, the same code | symbol is attached | subjected to the part similar to 1st Embodiment, and the description is abbreviate | omitted.

  In the first embodiment, the switching valve control unit 43 switches the switching valve 40 according to the difference in the discharge direction of the pump 45 due to normal rotation and reverse rotation of the front or rear propeller shaft 44. In the second embodiment, the switching valve control unit 43 switches the switching valve 40. The control unit 58 mechanically switches the switching valve 40 by forward and reverse rotation of the front or rear propeller shaft 44.

  That is, the switching valve control unit 58 of the second embodiment is engaged with the worm gear 59 provided integrally with the front or rear propeller shaft 44 and the worm gear 59 while being supported by the support shaft 60 on the vehicle body side. One end side of the gear portion 61 is rotatably connected to a substantially sector-shaped swinging member 62 formed around the support shaft 60 and an arm portion 63 extending laterally from the support shaft 60 of the swinging member 62. The other end side has an arm member 64 connected to the switching valve 40.

  Then, as shown in FIG. 5, when the vehicle 11 moves forward, the switching valve controller 58 of the second embodiment moves the swinging member 64 forward when the front or rear propeller shaft 44 rotates forward and the worm gear 59 rotates forward. And the arm member 64 moves away from the switching valve 40 to bring the switching valve 40 into the normal state described above. When the switching valve 40 is set to the normal state, the swinging member 62 does not swing further when the gear portion 61 is disengaged from the meshing of the worm gear 59 even if the worm gear 59 continues to rotate forward.

  On the other hand, when the vehicle 11 moves backward from the above state, the front or rear propeller shaft 44 reverses and the worm gear 59 reverses, as shown in FIG. 6, the swinging member 62 is disengaged from the meshed portion 61. Then, after meshing with the worm gear 59, it swings in the reverse direction, and the arm member 64 moves in the direction approaching the switching valve 40, so that the switching valve 40 is set to the switching state described above. When the switching valve 40 is switched, the swinging member 62 does not swing any further when the gear portion 61 is disengaged from the meshing of the worm gear 59 even if the worm gear 59 continues to reverse.

  According to the second embodiment, as in the first embodiment, it is possible to obtain an effect such as more comfortably and easily controlling the braking force with respect to the brake operation amount at the time of reverse travel where the speed does not increase, and also when the vehicle moves forward. Swing of the swing member 62 when the front or rear propeller shaft 44 rotates forward and the worm gear 59 rotates forward, and swing when the front or rear propeller shaft 44 reverses and the worm gear 59 reverses when the vehicle moves backward The switching valve 40 is switched depending on the difference between the swing of the member 62, and the switching valve 40 can be switched by utilizing the fact that the rotation direction of the front or rear propeller shaft 44 is reversed during forward and backward travel. Therefore, an increase in cost can be suppressed.

  Next, the brake device of 3rd Embodiment of this invention is demonstrated below centering on a different part from 1st Embodiment with reference to FIG. 7 and FIG. In addition, the same code | symbol is attached | subjected to the part similar to 1st Embodiment, and the description is abbreviate | omitted.

  In the first embodiment, the switching valve control unit 43 switches the switching valve 40 according to the difference in the discharge direction of the pump 45 due to forward and reverse rotation of the front or rear propeller shaft 44. In the third embodiment, the switching valve control unit 43 switches the switching valve 40. The controller 66 switches the switching valve 40 by swinging the front caliper 28.

  That is, the switching valve control unit 66 of the third embodiment attaches the front caliper 28 to the support shaft 68 parallel to the axis of the disc rotor D of the front suspension member 67 so as to be swingable, and also switches the switching valve 40 to the front suspension member 67. A sub master cylinder 69 that is in communication with the front caliper 28 is attached, and a link member 70 is connected to the disc rotor outlet side when the front caliper 28 moves backward, and the link member 70 is connected to the sub master cylinder 69. The front caliper 28 swings toward the outlet side of the disk rotor D by contacting the disk rotor D during forward braking, and at this position, the link member 70 does not press the sub master cylinder 69 and the switching valve 40 is Normal state.

  On the other hand, when the reverse braking state is entered from the above state, the front caliper 28 comes into contact with the disk rotor D and swings toward the outlet side of the disk rotor D, so that the link member 70 presses the sub master cylinder 69 to increase the hydraulic pressure. It introduce | transduces into the switching valve 40 via the connection flow path 71, and makes the switching valve 40 into the switching state mentioned above.

According to the third embodiment, as in the first embodiment, it is possible to obtain an effect such as more comfortably and easily controlling the braking force with respect to the brake operation amount when the vehicle is traveling backward without increasing the speed, and when the vehicle is moving forward. The changeover valve 40 is switched by the difference in the hydraulic pressure generated by the sub master cylinder 69 depending on the difference between the swing position of the front caliper 28 and the swing position of the front caliper 28 when the vehicle moves backward. The switching valve 40 can be switched using the fact that the caliper 28 swings differently. Therefore, an increase in cost can be suppressed.
Further, in the present embodiment, a vehicle whose reverse is slower than normal forward is described, but the present invention is not limited to this embodiment, and the present invention can be applied to all forward and reverse vehicles.

1 is a perspective view showing a saddle-ride type vehicle to which a first embodiment of the present invention is applied. 1 is a hydraulic circuit diagram showing a vehicle brake device according to a first embodiment of the present invention, and shows the flow of hydraulic fluid in a normal state by arrows. It is a characteristic line figure of the hydraulic control valve used for the brake device for vehicles of a 1st embodiment of the present invention. FIG. 2 is a hydraulic circuit diagram showing the vehicle brake device according to the first embodiment of the present invention, in which the flow of the hydraulic fluid in the switched state is represented by arrows. It is a hydraulic-pressure circuit diagram which shows the brake device for vehicles of 2nd Embodiment of this invention, Comprising: A normal state is shown. It is a hydraulic-pressure circuit diagram which shows the brake device for vehicles of 2nd Embodiment of this invention, Comprising: A switching state is shown. It is a hydraulic-pressure circuit diagram which shows the brake device for vehicles of 3rd Embodiment of this invention, Comprising: A normal state is shown. It is a hydraulic-pressure circuit diagram which shows the brake device for vehicles of 3rd Embodiment of this invention, Comprising: A switching state is shown.

Explanation of symbols

11 saddle riding type vehicle (vehicle)
12 Wheel 22 Brake device (Vehicle brake device)
23 Front brake device 27 Front master cylinder (master cylinder)
28 Front caliper (caliper)
38 Braking force control device (control means)
41 Hydraulic control valve 40 Switching valve 44 Propeller shaft (drive system member)
45 Pump 48 Circulation channel 49 One-way valve 51 Connection channel 59 Worm gear 62 Oscillating member 69 Submaster cylinder

Claims (4)

A vehicle brake device that generates a braking force on a wheel by a brake operation,
The braking force applied to the brake operation amount, have a control means for performing braking force control for controlling low during reverse travel of the vehicle with respect to time of forward movement of the vehicle,
It has a master cylinder that generates hydraulic pressure by brake operation and a caliper that generates braking force on wheels by the introduced hydraulic pressure,
The control means causes the master cylinder and the caliper to communicate with each other via a hydraulic control valve that controls to change a braking force with respect to a brake operation amount to a low level when the vehicle moves backward, while the master cylinder and the caliper Having a switching valve that communicates without passing through the hydraulic control valve,
The vehicular brake device characterized in that the control means switches the switching valve by a hydraulic pressure of a pump driven by a drive system member that rotates forward when the vehicle moves forward and reverses when the vehicle moves backward . The control means includes a circulation channel that connects the discharge side and the suction side of the pump during the forward rotation of the drive system member, and a liquid provided on the circulation channel from the discharge side to the suction side. A one-way valve that allows only the flow of the drive system, and a connection channel that connects the switching valve and a downstream side of the one-way valve of the circulation channel during the forward rotation of the drive system member, The vehicle brake device according to claim 1 , wherein the switching valve is switched by a hydraulic pressure introduced through a connection flow path. A vehicle brake device that generates a braking force on a wheel by a brake operation,
Control means for performing braking force control for controlling the braking force with respect to the brake operation amount to be lower when the vehicle is moving backward than when the vehicle is moving forward;
It has a master cylinder that generates hydraulic pressure by brake operation and a caliper that generates braking force on wheels by the introduced hydraulic pressure,
The control means causes the master cylinder and the caliper to communicate with each other via a hydraulic control valve that controls to change a braking force with respect to a brake operation amount to a low level when the vehicle moves backward, while the master cylinder and the caliper Having a switching valve that communicates without passing through the hydraulic control valve,
The control means includes a worm gear provided in a drive system member that rotates forward when the vehicle moves forward and reverses when the vehicle moves backward, and a swinging member that engages with the worm gear to swing when the worm gear rotates forward and backward. And the switching valve is switched by swinging of the swinging member.   4. The vehicle brake device according to claim 1, wherein the control unit performs the braking force control only on a front wheel. 5.

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