JPS5830811A - Vehicle suspension with car height adjuster - Google Patents

Abstract

PURPOSE:To adjust car height with a fixed spring constant by forming a cylinder chamber through accomodating an annular spring seat of a coiled spring in an annular cylinder so as to allow its liquidtightness and free sliding in the axial direction of the coiled spring and supplying oil pressure to the cylinder chamber selectively. CONSTITUTION:A coiled spring 3 of a vehicle suspension with a car height adjuster is arranged around a shock absorber 2 and the upper end of said spring is in contact with an annular body 6 making an annular spring seat through an insulator 5. The annular body 6 is accomodated in an annular cylinder 7 so as to slide freely along the axial direction of the coiled spring 3 and maintain liquidtight condition through sealing members 8,9. An annular cylinder chamber 10, demarcated by the dnnular body 6 and the collar-like cylinder 7, is connected to a hydraulic pump through a selector valve, which is controlled to make switching action so that car height may be maintained at the standard level according to a car height detecting signal from a car height detector 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system having a vehicle height adjustment function for a vehicle such as an automobile.

Vehicles such as automobiles 141I11 @ skewer rack am are those that combine a spring with a hydraulic cylinder, those that use an air spring, or those that use a shock absorber with a spring. A number of configurations have been proposed, such as one in which an air chamber is formed in the upper part and the shock absorber is configured as a shock absorber with an auxiliary air spring. However, the required space is large and the structure is quite complex, and those that use air pressure also require an air compressor, and in this case, the hysteresis of the diaphragm that makes up the air chamber increases the dynamic spring constant, impairing riding comfort. There was also the same title.

The present invention provides a vehicle height adjustment system having a coil spring, which can adjust the vehicle height by keeping the spring constant constant, and uses the cylindrical space left inside the coil spring to arrange shock absorbers and other supporting elements. By doing so, the entire structure has been improved to make it more fun! The object of the present invention is to provide a vehicle m* device with an adjustment device.

According to the present invention, the present invention includes a coil spring, an annular spring seat that receives one end of the coil spring, and an annular spring seat that accommodates the annular spring seat so as to be slidable in the axial direction of the coil spring and in a transparent state. A vehicle layer with a skewer adjustment holder, comprising: a cylinder; and a cylinder chamber defined by the annular spring seat and the annular cylinder and configured to selectively supply hydraulic pressure. This is accomplished by a racking device.

According to this configuration, the cylindrical cavity left inside the coil spring can be used as is for other supports such as stain absorbers! ! It can be used effectively as a space for the arrangement of elements, and it takes support! ! It is possible to keep the spring constant constant and adjust the spring constant by using an annular cylinder piston @pupil arranged annularly along the ring of the coil spring so as not to interfere with the spring constant.

The invention will now be described in detail by way of example embodiments with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, in which a vehicle suspension system with a skewer height adjustment mechanism is constructed into a structure incorporating a shock absorber, together with its m-hydraulic circuit. It is *iii figure which shows the principal part in more detail. In the figure, reference numeral 1 indicates a pair of left and right wheels, especially the rear wheels in this case, and these rear wheels have bearing devices at both ends of an axle (not shown in the figure) housed in an axle housing 35 of the axle. It is rotatably supported.

The axle housing 35 is suspended by a suspension structure consisting of a strut-type stain absorber 2 and a coil spring arranged in parallel. In particular, in the illustrated structure, the coil spring 3 has its lower end supported by a lower bracket 4 attached to the upper part of the outer cylinder 4a of the stain absorber 2 fixed to the axle 1a, and its upper end , is in contact with an annular body 6, which serves as an annular spring seat and constitutes an annular piston, via an insulator 5. This coil spring 3
are arranged substantially coaxially surrounding the shock absorber 2. The annular body 6 is housed in an annular cylinder 7 along the axial direction of the coil spring 3 or the stain absorber 2 so as to be freely movable and maintain a liquid-tight state through a seal member 8.9. The body 6 and the annular cylinder 7 define an annular cylinder chamber 10 (10J, 10'').

The annular cylinder 7 is appropriately fixed to a vehicle body side member such as an upper bracket 11 by a mounting screw member 12 and a nut 13, 14 screwed onto the screw member. A plurality of screw members 12 are used, and one of the screw members 12a has a through hole 115 bored in the axial direction, and a hole 115 is formed in the upper part of the screw member 12a as shown in FIG. Hydraulic circuit pipes 18 (16J, 16r) as shown are connected by a well-known shingle joint structure, and the hydraulic circuit is connected to the cylinder chamber 10 (10J, 10'') through a passage 15.
It is connected to the.

Lines 164 and 10r are connected via line 16 to a three-position valve 17.18 having a solenoid. These switching valves are selectively supplied with hydraulic pressure via a check valve 19 and an on-off valve 20 from a hydraulic pump 21 that supplies hydraulic pressure for driving power steering or for operating an automatic transmission hydraulic control device. . Three position switching valve 1
7.18 is the conduit 16J when in the neutral position shown;
The supply of hydraulic pressure to 16r is cut off, and solenoid 22
．． 23 are respectively switched to the lower positions in the figure by being energized based on a command signal from an electric circuit 24 to be described later, the hydraulic pressure from the hydraulic pump 21 is transferred to the cylinder chamber 10.
4.10", and when the solenoids 25 and 26 are energized based on the command signal of the electric circuit 24 and switched to the upper position in the figure, the supply of hydraulic pressure from the hydraulic pump 21 is cut off. Together with the cylinder chamber 10J, 1
The hydraulic pressure within 0r is returned to the hydraulic tank 28 through a pipe 27. The on-off valve 20 is operated from the electric zero path 6-24 by detecting this with the hydraulic sensor 29 when a hydraulic pressure drop occurs due to a hydraulic leak etc. in the power steering or automatic transmission hydraulic system 41 @ beast. The valve is closed in response to the switching signal issued, cutting off the communication between the reduced hydraulic pressure source and the cylinder chamber 104.10 of the skewer adjustment@xi, and adjusting the power steering device or automatic walnut machine hydraulic control device before it malfunctions. Also, in the event that oil leaks from the on-off valve 20 to the hydraulic system for adjusting the height of the bale, there are valves installed at several appropriate locations not shown in the figure. This is detected by a similar oil pressure sensor, and the on-off valve 20 is closed to prevent any adverse effects on the power steering or the hydraulic system of the automatic transmission.

Reference numeral 30 indicates a vehicle height detection device, and the measuring element 32 of the vehicle height sensor 31 is connected to the vicinity of the left end of the axle housing 35 via links 33 and 34, and detects the maximum vertical displacement of the left side of the vehicle body with respect to the axle housing 35. When the vehicle height on the left side of the rear wheel is smaller than a predetermined standard vehicle height, the solenoids 22 and 23 are energized via the electric circuit 24. When the left side ratio of the bale wheel part^ is equal to the standard vehicle height, no solenoid is energized, and when the rear wheel part left side ratio^ is greater than the standard vehicle height, the solenoids 25 and 26 are energized. . Although this vehicle height detection device is omitted in the figure, it is similarly provided on the right side of the vehicle body, and based on its output signal, the cylinder chamber 1 of the right vehicle height adjustment device is
Hydraulic pressure supply and discharge for 0r is as described above! ! It is now carried out in the same manner as the territory.

In this configuration, when the rear wheel height is lower than the standard vehicle height due to a large loading capacity, the solenoid 22.
23 is energized, hydraulic pressure is applied to the cylinder chamber 10.
J and 10r, respectively. As a result, the annular body 6
is slidably displaced downward with respect to the annular cylinder 7, thereby substantially displacing the coil spring 3 and the stain absorber 2 downward, and as the vehicle body rises relative to the other, the rear wheel width is increased. It becomes like this. Then, when the rear wheel height reaches the standard rate^, the energization to the solenoid 22.23 is stopped, and the three-position switching valve 17.18 is switched to the neutral position shown, thereby cutting off the supply of hydraulic pressure. . This keeps the rear wheel height at the standard vehicle height. Also, if the rear wheel height is higher than the standard vehicle height, solenoid 25.26
is energized, and the hydraulic pressure in the cylinder chambers 104.10'' is returned to the hydraulic tank 28 through the pipe 27, so the annular body 6 rises within the annular cylinder 7 and the vehicle height decreases.

When this vehicle height decreases to the standard vehicle height, solenoid 25.2
6 is stopped, and the rear wheel *^ is maintained at the standard vehicle height.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to these embodiments, and various embodiments are possible within the scope of the present invention. This will be clear to those skilled in the art. For example, although the present invention has been described above with respect to an embodiment of an axle-suspended vehicle, the structure of *** is applicable to an independent suspension system. It can also be implemented for vehicle suspension systems.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing one embodiment of a skewer suspension system with a vehicle height adjustment device according to the present invention, and Fig. 2 is a partially enlarged sectional view of the skewer suspension system with an adjustment device. It is. 1... Rear wheel, 2... Shock absorber, 3...
Coil spring, 4... Lower bracket, 5... Insulator, 6... Annular body, 7... Annular cylinder, 8
．． 9... Seal member, 10 (IOJ, 10'')...
cylinder chamber. 11... Upper bracket, 12.128... Screw member, 13.14... Nut, 15... Passage, 1
6 (164, 16r) - Snowy road, 17.18... Three position switching valve, 19... Check valve, 20... Opening valve, 2
1...Hydraulic pump, 22.23...Solenoid,
24...Electricity 0 path, 25.26...Solenoid, 2
7--Pipe line, 28--Hydraulic tank, 29--Hydraulic pressure sensor, 30--Vehicle height detection device, 31--Vehicle height sensor, 32--Measuring element, 33.34--・Link, 3
5-...Axle housing patent applicant Toyota Motor Corporation Agent
Patent Attorney Masaru Akashi 10- '$ 1. ,Figure 6Figure 2Figure 6

Claims (2)

[Claims] (1) a coil spring, an annular spring seat that receives one end of the coil spring, and an annular cylinder that accommodates the annular spring seat so that it can vibrate in the axial direction of the coil spring and in a liquid-tight state;
A skewer rack with a skewer height adjustment mechanism, characterized by having a cylinder chamber defined by the annular spring seat and the annular cylinder and configured to selectively supply hydraulic pressure. @. (2) a coil spring, an annular spring seat that receives one end of the coil spring, an annular cylinder that houses the annular spring seat in a tight state so as to vibrate in one direction of the axis of the coil spring, and the annular spring seat. and the annular cylinder, and the cylinder chamber is configured to be selectively supplied with hydraulic pressure; A vehicle suspension with a vehicle height adjustment device @Hitomi characterized by having a stain absorber.