JPS58139855A - Front and rear wheel interlocking brake device of vehicle - Google Patents

Abstract

PURPOSE:To prevent the vehicle from falling-in during its turning at low speed by a structure wherein a metering valve is provided between a front wheel brake and a master cylinder in order to put the front wheel brake into inoperative state until a predetermined pressure is attained. CONSTITUTION:A front wheel brake 44 is actuated with a brake lever 48. The other front wheel brake 46 is actuated through the metering valve 68 with a brake pedal 54, to which a rear wheel brake 64 is also connected through a proportioning valve 66. Liquid pressure is prevented by means of the metering valve 68 from being transmitted to the front wheel brake 46 until the liquid pressure in the master cylinder 56 is attained to the predetermined value. Owing to the structure as described above, the front wheel brake is not brought into operation even by actuating the brake pedal 54 during the turning of the vehicle at low speed, resulting in preventing from occurring the falling-in phenomena of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front and rear wheel interlocking braking device for a vehicle, and is particularly suitable for a motorcycle, and supplies pressurized fluid to a front wheel caliper and a rear wheel caliper from the same pressure fluid source in one operation. Furthermore, a globrationing valve is disposed between the pressure fluid source and the rear wheel caliper, and when the pressure of the fluid supplied to the rear wheel caliper exceeds the actuation start pressure of the probortioning valve, the rear wheel caliper is activated. The present invention relates to an improvement in a front and rear wheel interlocking brake device in which the pressure increase rate of the pressure fluid is smaller than the pressure increase rate of the pressure fluid to the front wheel caliper.

According to Figure 1, the conventional front and rear brake system for motorcycles is #! , reveal. As shown in FIG. 1, a front wheel (not shown) is provided with two discs 10, 42, and a caliper 14.16 is provided in a position adjacent to these discs 10.12. Caliper 14.16
Although not shown in the figure, there are pads such as 1fflff that are actuated by hydraulic pressure, and these pads actuate the disks 10,
By squeezing 12, braking force is applied to the front wheels. A plate attached to a handle (not shown)? When the l/bar 18 is operated, the master cylinder 2
Pressure oil is supplied from the vehicle to the caliper 14 via v22 to apply braking to the disc 10 attached to the front wheel. The disc 101, caliper 14, brake lever 18, and master cylinder 20 function as an auxiliary brake device separate from the front and rear wheel interlocking brake device described later.

- The rear wheel interlocking brake system for 10,000 cars applies braking force to front wheels and rear wheels (not shown) when the brake pedal 24 is operated. That is, when the brake pedal 24 is depressed, pressure oil is supplied from the master cylinder 26≧, and the pressure oil from the master cylinder 26 is branched to W2.
It is supplied to the front wheel caliper 16 through a tube 30, and is further supplied through a tube 30 to a rear wheel caliper 34 which is housed in close proximity to a disc 32 attached to the rear wheel.

Probo 7 Yoning Pulp 36 is disposed in the connecting part 30 that connects the master cylinder 26 and the rear wheel caliper 34, and when the pressure exceeds a predetermined pressure, it suppresses the pressure oil supplied to the rear wheel caliper 34 and reduces the front fluid pressure. The distribution ratio with post-infusion pressure is changed.

Generally, when a brake system is activated in a running vehicle, the load moves forward due to deceleration, and the load applied to the front wheels becomes larger than the load applied to the rear wheels. In such a situation, if you want to apply the same braking force to the front and rear wheels, the braking force to the front wheels must be greater than the braking force to the rear wheels. As can be seen from the hydraulic pressure distribution diagram in the figure, the ideal braking hydraulic pressure distribution curve is as shown in Gap. The Provo 7 Yoning pulp 36 is provided in a rounded manner to bring the actual distribution curve as close as possible to this ideal braking fluid pressure distribution -*p+, and at point At in Fig. 2, the distribution ratio of the pre-infusion pressure and the post-infusion pressure is The ratio is 1:1, but from this point A, the valve 36 operates, suppressing the pressure oil supplied to the rear wheel side, and supplying a large amount of pressure oil from the rear wheel caliper to the front wheel caliper. [Indicated by P in Figure 2]

However, in the conventional front and rear wheel interlocking brake system, the front fluid pressure and the rear wheel equal pressure are 1 until the low pressure point A.
Since it is supplied in a ratio of 1:1, when used in a motorcycle, the front end may lock during low-speed turns, leading to the possibility of the vehicle body collapsing.

The present invention has been made in view of these circumstances, and provides a front and rear wheel interlocking braking device for a motorcycle, which can prevent the vehicle body from collapsing even when the brakes are applied during low-speed turns. Linked play? The purpose is to propose a device. The present invention supplies pressure fluid to a front wheel caliper and a rear wheel caliper from the same pressure fluid source in one operation, and a Probo 7 Yoninda valve is disposed between the pressure fluid source and the rear wheel caliper, and When the pressure of the fluid supplied to the caliper exceeds the activation start pressure of the 70-bowling valve, the pressure term jJD rate of the pressure wire rod of the rear wheel caliper is made smaller than the pressure increase rate of the pressure fluid to the front wheel caliper. On the surface of the wheel interlocking player, a V metal ring pulp is provided between the pressure fluid source and the front wheel caliper, and the pressure of the fluid applied to the front wheel caliper is 10.
Since the supply of pressurized fluid to the front wheel caliper is stopped until the starting pressure of the metering pulp, which is lower than the starting pressure of the Beautioning pulp, is reached, even if the brake system is activated during low-speed turns, Since no braking force is applied to the front wheels, the vehicle body will not fall over.

A preferred embodiment of the front and rear wheel interlocking braking system for a vehicle according to the present invention will be explained below with reference to FIG. 3.1 In FIG. A caliper 44.46 is provided adjacent to the disc 40.42. caliper 44.4
6 is provided with a hydraulically operated pad (not shown), which applies braking force to the front wheels by squeezing the discs 40, 42. The brake lever 48 is supported by a handle (not shown), and when the brake lever 48 is actuated, pressure oil is supplied to the caliper 44 from the master cylinder 50 to f52. As a result, when the brake lever 48 is actuated, braking force is applied to the front wheels. The disc 40, caliper 44, brake lever 48, and master cylinder 50 function as auxiliary devices separate from the front and rear wheel interlocking brake device described later.

The brake pedal 54 is located on the side of the frame that is not shown in the figure.
When the brake pedal 54 is depressed, pressure oil is supplied from the master cylinder 56 to the calipers 64 and 46 of the n+1 wheel. That is, pressure oil from the master/linda 56 is supplied to the CqiJ vM II caliper 46 via a pipe 58 branched in the middle, and is also supplied to the disc 62 attached to the rear wheel side via the cylinder 6 (lr). 4 m of pressure oil is applied to the adjacent rear wheel caliper 64. Master cylinder 5
6 and the rear wheel side caliper 64 are connected II! A blow-off valve 66 is provided at t60, and when the hydraulic pressure reaches a pressure higher than the actuation start pressure of the blow-off valve 66, the supply of pressure oil to the opposite side caliper 64 is suppressed.
The pressure increase rate of the pressure fluid to the rear caliper is made smaller than the pressure increase rate of the pressure fluid to the front wheel caliper. Master/linda 56 and front wheel caliper 4
A metering pulp 68 is disposed in a pipe 58 that connects the metal ring 6 with the pipe 58 . As shown in FIG. 3, the metering pulp 68 is designed to cut off the supply of pressure oil from the master cylinder 56 to the front wheel caliper 46 until the pressure exceeds a predetermined pressure. That is, when the pressure sent from the master cylinder 56 is overcome by the biasing force of the spring 70 of the metering pulp 68, even if pressure oil is supplied from the pipe 72, the metering pulp 68 will not communicate with the front wheel caliper. 4
The supply of pressure oil to 6 is cut. Next, when the brake pedal 54 is further depressed and the pressure of the pressure oil in the master cylinder 56 decreases, the pressure applied from w72 overcomes the biasing force of the spring 70, the metering pulp 68 opens, and the front wheel caliper 46 It is designed to supply pressure oil to the The starting pressure of the metering pulp 68, that is, the pressure at which the pressure of the pressure oil sent from '172 overcomes the restraining force of the spring 70, is set lower than the starting pressure of the Grobo/Jonning valve. The hydraulic pressure distribution curve in the above embodiment is as shown in Fig. 4P, and as can be seen from Fig. 4, when the pressure is high, almost no pressure oil is supplied to the front wheels, and therefore when the pressure is low, the pressure oil is not supplied to the front wheels. In this case, braking force is applied only to the rear wheels. Therefore, even if the front and rear wheel interlocking brake devices are activated during low-speed rotation, the unit will not fall over.

When the brake pedal 54 returns to its original position, the pressure oil supplied to the forward and negative side calipers 46 is collected into the master cylinder 56 by the check box 74.

As explained above, according to the front and rear wheel interlocking braking device for a vehicle according to the present invention, the pressure fluid source and the front wheel caliper are connected to one another.
Since the pressure fluid is not supplied to the front wheel caliper until the starting pressure of the metering pulp reaches the metering pulp tS, the vehicle body will not be able to ml even if the forward load interlocking brake system rk is activated during a low-speed turn. There is no such thing.

[Brief explanation of the drawing]

Fig. 1 is a piping diagram showing the structure of a conventional front and rear interlocking brake system for a motorcycle, Fig. 2 is a hydraulic pressure distribution diagram of the conventional front and rear interlocking brake system shown in Fig. 1, and Fig. 3 is a diagram of the present invention. FIG. 4 is a hydraulic pressure distribution diagram of the embodiment according to the present invention. 42... Front wheel side disc, 46... Front wheel side caliper, 54... Brake pedal, 56... Master turn cylinder as a hydraulic drive source, 62
...Rear wheel side disc, 64...Rear wheel side caliper, 66... Grooportioning valve, 68... Metering pulp. Agent Tatsuyuki Unuma (and 2 others) Figure 1 Figure 2 Kyou Figure 3 Figure 8 Figure 4

Claims (1)

[Claims] Pressure fluid is supplied from the same pressure fluid source to the front wheel caliper and the rear wheel caliper in one operation, and a blow-off valve is disposed between the pressure fluid source and the rear wheel caliper, and the rear wheel caliper When the pressure of the fluid supplied to the provisioning valve exceeds the activation lA starting pressure, the rate of pressure fluid pressure Xll71Il to the rear wheel caliper is suppressed to be smaller than the pressure increase rate of the pressure fluid to the front wheel caliper. In the wheel-linked brake system, a metering pulp is provided between the pressure fluid source and the front wheel caliper, and the pressure of the fluid supplied to the front wheel caliper is lower than the actuation start pressure of the provisioning valve. A front and rear wheel interlocking braking device for a vehicle is configured to stop supplying pressurized fluid to a front wheel caliper until the pressure at which a valve starts operating is reached.