JPS6343242B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-dive nose device for a vehicle equipped with an anti-roll device, which locks the hydraulic pressure of left and right front dampers during braking to prevent the front portion from sinking.

When a vehicle turns, one side of the vehicle sinks relatively due to centrifugal force, and the other side relatively rises.The higher the speed, the greater the acceleration, and the larger the centrifugal force, the greater the amount of sinking and lifting. Therefore, a so-called anti-roll system has been proposed. For example, the front and rear left and right dampers are communicated as a hydraulic unit, and valve means are interposed in the left and right hydraulic lines to cut off communication between the left and right dampers during rolling. A system has been proposed that locks the hydraulic pressure of the damper to prevent the damper from sinking and rising, or by preferentially supplying hydraulic pressure from a hydraulic source to the sinking side to prevent sinking.

When such a system is adopted, the front and rear dampers on the right or left are hydraulically connected, so
In order to prevent the front part from sinking during sudden braking, or so-called diving, it is necessary to shut off only the left and right hydraulic lines of the front damper during braking, and to connect the front and rear lines during normal driving. There are technical issues that must be solved, such as the fact that the braking force during braking changes depending on the loaded weight.

The present invention has been made to solve such technical problems, and its purpose is to provide a normally open valve means in the left and right hydraulic lines for shutting off the hydraulic lines of the front and rear dampers using the brake hydraulic pressure during braking. The front left and right dampers are hydraulically locked during braking to prevent sinking and create an anti-dive nose, and the hydraulic pressure in the damper line is introduced into the valve opening/closing member to prevent the damper from sinking due to the load weight. The internal pressure is applied to the opening/closing member, and the brake hydraulic pressure corresponding to the load capacity is used to perform the above-mentioned lock, and the anti-dive nose can be automatically performed according to the vehicle weight. without the need for valve means,
To provide an anti-dive nose device that uses one valve means and has a simple structure.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of an anti-roll system including a device according to the invention.

1 is the front left damper, 2 is the front right damper, 3
4 is the rear left damper, and 4 is the rear right damper, both of which are comprised of hydraulic shock absorbers. The left front and rear dampers 1 and 3 are hydraulically connected through a line 5, and the right front and rear dampers 2 and 4 are hydraulically connected through a line 6. A rolling control valve 7 is interposed between the lines 5 and 6, and the valve 7 has a ball valve 8 inside a case 7b having a funnel-shaped bottom 7a. The case 7b is connected to the right line 6 by a connection line 6a, and the right one is connected to the left line 5 by a connection line 5a, and the middle point of the case 7b is connected to the hydraulic source 9 by a line 9a through a through hole 7e with a check valve. connected via.

In the above, the ball valve 8 rolls toward the outside of the turn due to centrifugal force during turning, closing the hole on that side, and thereby hydraulic pressure is preferentially supplied to the outside line through the hole on the opposite side. By shutting off one line, the hydraulic pressure of the front and rear dampers on one side is locked to prevent lifting, and the hydraulic pressure of the front and rear dampers on the other side is increased to prevent sinking, thus preventing rolling when turning and preventing anti-roll. When the rotation is completed, it returns to the neutral position by the centripetal action of the funnel bottom 7a, and the lines 5 and 6 are brought into communication. Note that the control valve is not limited to the above, but is arbitrary.

An anti-dive control device 10 is interposed at a position close to the front dampers 1 and 2 on lines 5 and 6 that communicate the front and rear left and right dampers.

The control device 10 is shown in detail in FIG. 2, and has a longitudinal hole 12 in a body 11, and a valve body 13 consisting of a spool valve is fitted into the hole 12 so as to be slidable in the axial direction. At the rear of the valve body 13, there is formed a large-diameter recess 13c that opens rearward in the rear direction, and at the center there is formed a through hole 13d that extends in the axial direction and communicates with the recess 13c. Concave grooves 12a, 12b, 12c, and 12d are provided on the inner diameter portion of the body 11, spaced apart in the axial direction, while grooves 13a, 13b are provided on the outer periphery of the valve body 13, spaced apart in the axial direction. , in the concave grooves 12a to 12d on the body side, 12a is the branch line 1.
0a to front left line 5b, also 12b
is connected to rear left line 5 via branch line 10b.
c through ports 12e, 12f, and therefore line 5 connects ports 12e, 12f, grooves 12a, 12f at the front.
12b. Also groove 12c
is the front right line 6 via the branch line 10c.
In b, 12d communicates with the rear line 6c through the ports 12g and 12h via the branch line 10d, and therefore the line 6 communicates with the front part through the ports 12g and 12h and the grooves 12c and 12d. Ports 12e, 1 connected to the above left and right front lines
2g communicates through a communication passage 12i, while a large diameter recess 13c that opens rearward in the axial direction is formed at the rear of the valve body 13, and a small diameter through hole 13 that communicates with the recess 13c.
d is formed in the center of the valve body 13 in the axial direction as described above, and a spring 15 is interposed between the bottom of the recess 13c and the end surface of the plug body 14 at the open end of the hole 12 of the body, is constantly pressed to the left in the figure, opening the entire valve.

A lid body 16 is fixed to the front part of the body 11, and a seal plate 17 having a radial flange 17a is interposed between this and the end face of the body.
3, the front end comes into elastic contact with the seal plate 17 and its forward movement is restricted. The front part of the small-diameter passage of the valve body 13 is a large-diameter cylinder part 13e, into which the rear piston part 18a of the pusher 18 is slidably fitted, and the intermediate part 18b
passes through the through hole 17b in the center of the seal plate 17, and the lid body 1
The tip 1 is inserted into the coaxial cylinder hole 6a provided in the cylinder hole 6a.
8c is coming. A plunger-shaped piston member 19 is provided in the cylinder hole 16a so as to be slidable in the axial direction, and its tip is opposed to the tip 18c, and its rear end is brought into contact with the stopper 20 of the cylinder hole 16a, The rear end portion is semispherical to form a hydraulic surface 19a, and the rear portion of the cylinder hole 16a facing the hydraulic surface 19a is connected to the braking hydraulic line 21 with ports 21a and 21b.
The upstream side of the line 21 communicates with the master cylinder 22 and the downstream side communicates with the brake device, so that the line 21 is interposed in the brake line.

Seal members 23 and 24 are arranged around the rear half of the piston member 19 in the axial direction, one of which is placed against the wall surface of the stepped portion of the cylinder hole 16a to seal both, and one of the seal members 23 and 24 is placed on the back of the rear circumference of the piston member 19, and one of the seal members 24 is placed against the wall surface of the stepped portion of the cylinder hole 16a to seal the two. A seal ring 25 is inserted in the groove 18d to open the seal plate 17 through hole 17b.
Furthermore, a seal ring 26 is interposed between the front end of the hole in the body 11 and the front end of the valve body 13 to provide a seal, thereby reliably blocking the braking hydraulic pressure and the damper hydraulic pressure.

Furthermore, a groove 27 communicating with other grooves is provided at the rear of the hole 12 in the body, while a groove 27 and a large-diameter recess 13c, that is, a chamber in which the spring 15 is housed, are provided at the rear of the valve body facing this. Through hole 2 that communicates with
8 is provided to introduce damper oil pressure into the recess 13c.

Next, we will discuss its functions and effects.

Under normal conditions, the valve body 13 is located on the left side as shown in FIG.
h is continuous, left and right lines 5 and 6 are lines 5b,
5c communicates with 6b and 6c to perform the anti-roll action described above.

When the master cylinder 22 is depressed during braking, the hydraulic pressure in the braking hydraulic line 21 increases, and as a result, the hydraulic pressure in the chamber at the rear of the piston member 19 of the cylinder section 16 that communicates with the line 21 increases. It acts on the hydraulic surface 19a. As a result, the piston member 19 presses the pusher 18 in the axial direction against the spring 15, and the valve body 13 slides to the right in FIG. 12a to 12d are closed, that is, the left and right front ports 12e and 12g are connected to the left and right rear ports 12f and 12h.
As a result, the front dampers 1 and 2 are cut off from the rear dampers 3 and 4 in the lines 5 and 6. As a result, the front dampers 1 and 2 are oil-locked and are cut off since there is no communication with the rear, and the locked oil pressure prevents diving. After the brake is released, the valve body 13 moves to the left by the action of the spring 15, returns to its original position, and connects the ports, thereby performing the anti-roll action. In this way, the braking oil pressure is detected, and a single valve means is used to shut off the damper oil pressure lines at the left and right front parts from the rear part, thereby performing an anti-dive nose effect.

By the way, the braking force changes depending on the loaded weight, and as the loaded weight increases, the braking force also increases, and even in light braking, the above-mentioned operation is performed with this braking oil pressure. When the loaded weight increases, the damper oil pressure increases accordingly, and this oil pressure acts on the spring chamber 13c through the groove 27 and the through hole 28, and further acts on the piston portion 18a of the pusher 18 through the through hole 13d. Therefore, the force for holding the valve body 13 open is the spring plus the increase in hydraulic pressure. Therefore, the piston member 19 is actuated only by a large braking oil pressure in this state, and performs the above-mentioned action, and performs an anti-dive nose action in accordance with the loaded weight.

As is clear from the above, according to the present invention, it is possible to effectively suppress and control the diving of the front part during braking while employing an anti-roll system. It has many advantages, such as being able to be designed with minimal parts and simple piping, and automatically controlling diving during braking according to the loaded weight by detecting the damper oil pressure.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram of the present invention including an anti-roll system;
FIG. 2 is a longitudinal sectional view showing the main parts of the present invention. In the drawing, 1 to 4 are dampers, 5 and 6 are lines, and 7
13 is a control device, 13 is a valve means, 15 is a spring, 13c
1 is a spring chamber, 18 is an intermediate member, 19 is a piston, 2
1 is a brake hydraulic line, and 23 to 26 are seal members.

Claims (1)

[Claims] 1. The front and rear dampers on one side and the front and rear dampers on the other side are connected to each other by individual lines, and a control device is provided between the two lines to cut off one of the lines during rolling. In a vehicle equipped with an interposed anti-roll device, the front and rear lines are always open between the two lines near the front damper, and the piston member slides with braking oil pressure to prevent the line from moving against the elastic biasing force. An anti-dive nose device for a vehicle, characterized in that a valve means for closing between the front and rear is provided. 2. An anti-roll device in which the front and rear dampers on one side and the front and rear dampers on the other side are connected in communication through individual lines, and a control device is interposed between the two lines to cut off one of the lines during rolling. In the vehicle, a valve means is provided between the two lines near the front damper, which always opens the front and rear of the line and closes the front and rear of the line by sliding a piston member using braking oil pressure against a spring force. An anti-dive nose device for a vehicle, characterized in that a damper hydraulic pressure is introduced into a spring chamber of a valve means. 3. An anti-roll device in which the front and rear dampers on one side are connected to the front and rear dampers on the other side through individual lines, and a control device is interposed between the two lines to shut off one of the lines during rolling. In the vehicle, a valve means is provided between the two lines near the front damper, which always opens the front and rear of the line, and closes the front and rear of the line by sliding a piston member using braking oil pressure against an elastic biasing force. An intermediate member is interposed between the piston member and the valve means, and a seal member is interposed between the piston member, the circumference of the intermediate member, the end face of the valve means, and the sliding surface. Anti-dive nose device for vehicles.