DE1480162C - Self-pumping strut with internal level control for vehicles - Google Patents

Description

2. Self-pumping suspension strut, very precisely regulated during the journey according to the construction of the display claim 1, characterized by its arrangement and can be complied with. Even when you are standing still the center of a rigid rear axle (38), related to the vehicle, the target level should be over a longer period gen on the trail. Time goes. Iten.

This task is achieved according to the invention

solves that with a continuous longitudinal bore

provided pump stamp by the spring in the pump

50 pen cylinders only in the upright area against the floor

The invention relates to a self-pumping reservoir; is printed on which his

of the spring strut with internal level control for the longitudinal drive bore tightly closing sealing element

witness, consisting of a helical spring, one is provided, while outside the upright ^ -: -

an upper spring plate of the helical spring supports the short-circuiting of the pump suction valve

the hydraulic Stellzylirtder, the actuating piston 55 taken by the pump cylinder and by

is connected to the sprung masses, a condensed sealing element is lifted off,

centrally arranged within the helical spring is further proposed according to the invention,

Reservoir for the hydraulic fluid, the. with a spring containing the aforementioned features

a lower leg supported by the unsprung masses in the middle of a rigid rear axle

Ren spring plate for the coil spring is connected, 60 on the track to be arranged. While maintaining the up

a suspension from rigid rear axles, which is now common in the hydraulic fluid control area

The central arrangement of the strut according to the invention results in the supply of the storage container in the adjusting cylinder

Pump device that has the same advantage as the invention for rigid axles with the adjusting piston,

Bundencn pump cylinder, one of the reservoirs you already know on pendulum axles: The mo-

the centrically penetrating, through the bottom of which the mentance center of the rigid axis is

actuated and lowered in the pump cylinder with a spring to regulate the shock absorber so that it

interacting pump stop, a between only slightly higher than the instantaneous center of the

Storage rinse and pump cylinder located across the axis. This increases the momentary axis

480 162

that is the connection between the momentum centers of the Rear and front axles, not so much towards the rear.

An embodiment of the invention is described in the following description in connection with the Drawings explained:

F i g. 1 shows a longitudinal section through a suspension strut according to the invention, assuming that the vehicle is normally loaded and the vehicle body is in the nominal level;

F i g. 2 shows a partial section through the lower spring plate in the fully compressed position;

F i g. 3 shows a partial section through the lower spring part in the fully extended downward position;

F i g. 4 shows a schematic representation of an example for the use of the invention Suspension strut with a rigid rear axle of a motor vehicle with two separately arranged vibration dampers;

F i g. 5 shows a cross section through the axle tube with a side view of a rigid rear axle a strut arranged in the center of the axle as an additional spring according to the invention;

F i g. 6 shows a plan view of the rigid rear axle according to FIG. 5;

F i g. 7 shows the side view of a motor vehicle with the instantaneous center of the front axle, the normal and the remote instantaneous center of the rear axle as well as the normal and the lowered instantaneous axis.

The self-pumping spring strut with internal level control for Vehicles has a coil spring 24 for cushioning the wheels against the vehicle body. An actuating piston 34 of an actuating cylinder 33 acted upon by liquid has a downwardly projecting one Shaft 16, the lower end of which is immersed in the liquid 23 of a storage container 28. in the The lower end of the shaft 16 houses a pump cylinder 19, a pump suction valve 20 and a pump piston 21 of a pump device for level control. The actuation of the pump ram 21 takes place through the bottom of the storage container 28, which participates in the up and down movement of a lower spring plate 27 of the helical spring 24. There no If the roadway is absolutely level, the storage container swings 28 continuously up and down, either with the frequency of the vehicle body, which depends on the vehicle between 60 and 100 vibrations per minute, or with the higher frequency of the wheel or axle vibrations. In this case, the pump plunger 21 is liquid from the reservoir 28 via the Pump suction valve 20, the pump cylinder 19, a pump pressure valve 32 and a bore 30 in one Pressure chamber 31 in the actuating cylinder 33 is pumped. A through longitudinal bore 22 of the pump plunger 21 is secured by a sealing element located on the bottom of the storage container 28 during pumping 26 tightly closed. Instead of that shown in the drawing, made of an elastic material, for example Rubber, existing Dichtelcmentes 26 can also be a conical mandrel made of steel, which the Liingsbohrung 22 seals tightly, can be used. The actuating piston 34 is a noise-isolating Rubber-metal connection 1 firmly connected to the vehicle body. Exceeds the vehicle body its target level by the constant pumping of liquid into the pressure chamber 31, then the pump ram 21 lifts off the sealing element 26 and stops pumping. There is a feather 18 is held under pretension by a sleeve 17, a cut-off valve 12 is activated after exceeding the nominal level is lifted from its seat, and flows out of the pressure chamber 31 via bores 10, 8

is and 7, the pump cylinder 19 and the longitudinal bore 22 liquid into the reservoir 28 from. This sinks the vehicle body and with it the Adjusting piston 34 back to the level position, in of the regulating valve 12 via the Pec ^ r 18, which from

so pump plunger 21 is pressed upwards, the bore 7 closes again tightly. At maximum load, the helical spring 24 is compressed by an upper spring plate 4 by the amount C , and the level control has the task of

a5 Pump up the vehicle body by the same amount. The storage container 28 is guided over its inner diameter on the outer diameter of a tubular extension 29 of the actuating cylinder 33. Since a rubber sleeve 14 tightly connects the storage container 28 to the upper spring plate 4, leakage oil which escapes from a seal 9 can flow back into the storage container 28 via bores 5 and 15. The leakage oil emerging from a seal 11 also flows back directly into the storage container 28. 2 is a rubber hood, 3 is a steel cap, and 6 is a steel reducer. 13 is a slotted and resilient ring as a stop for the shaft 16 on its way up. 25 is a rubber mushroom for noise reduction. The letter A indicates the amount of upward deflection of the wheel and the letter B the amount of downward deflection of the wheel.

In Fig. 5 and 6 is a rigid rear axle 38 across

two lower trailing arms 35 and an upper wishbone 39 articulated to the vehicle body. Two coil springs 36 carry about 60 to 75% of the weight on the rear axle of the vehicle body. The rest of the spring force is

applied by the helical spring 24 acting as an additional spring Jes strut according to the invention, which is arranged in the center of the axis. All three springs are damped by two vibration dampers 37.

In Fig. 7 knows Jen the instantaneous center 40 of a front axle and the instantaneous center 43 of one Rear axle connected by a Mornentan axle 41. 44 denotes this by being an additional spring acting coil spring 24 of the strut according to the invention, lowered rear instantaneous center, and 42 symbolizes the lowered instantaneous axis.

1 sheet of drawings

Claims (1)

1 2 and outside the upward regulation range for the patent claims: dung of the pumping action short-circuited pump suction valve and one between the pump cylinder and 1. Self-pumping shock absorber with internal Ni-actuating cylinder arranged pump pressure valve umveauregelung for vehicles, consisting of an S and a cut-off device, which is in the cut-off coil spring, an upper spring plate also short-circuits the pump pressure valve and the hydraulic spring supporting the liquid from the adjusting cylinder m the supply adjusting cylinder, whose actuating piston lets flow back with the spring reservoir. A concentric, self-pumping shock absorber is beneath it the coil spring arranged for io already the subject of the earlier German patent Reservoir for the hydraulic fluid, the one with 1 480 136. This strut provides a great deal of cleanliness Gel accuracy supported by the unsprung masses is achieved, and simple Lower spring plate for the helical spring prevents the car body from moving for a long time is bound, one falls below the set level in the hydraulic standstill upward control range. It has liquid from the reservoir in Fig. 15 yet shown that in some cases it is desirable-actuating cylinders conveying pumping device, which is worth the required target level with even greater one Accuracy of the pump connected to the actuator must be observed. cylinder, one of the storage container centrically To the state of the art (USA.-Patent penetrating 3 150 867), actuated by its bottom, includes a self-pumping shock absorber and in the pump cylinder with a spring together with internal level control for vehicles with a flow-acting pump ram, a storage container between helical springs and one in series with this and pump cylinder arranged hydraulic actuator, in which as Abregelmetes and bores are provided outside the regulating area for the mechanism, which are below connection of the pumping action short-circuited the position corresponding to the target level Pump suction valve and a 25 pump rod between the pump rod opposite the damping piston and adjusting cylinder arranged pumps are closed. This known strut has includes pressure valve, and a regulating device, a relatively complicated structure, the in Abregelbereif.h also di> s pump pressure without this thereby a reliable control accuracy valve short-circuits and the liquid can be reached from. Control cylinder flow back into the reservoir 30 Finally, U.S. Patent No. 2,592,391 shows lets, characterized in that also such a self-pumping strut with a continuous longitudinal bore (22) with internal level control for vehicles, one See pump ram (21) by the spring (18) second pump device as a regulating mechanism in the pump cylinder (19) only in the upward control area for level control. Here, too, will be a driven against the bottom of the storage container (28) - 35 relatively great structural effort, is pressed, on which a its longitudinal bore (22) allows the reliability of the Abregelrnechanismus tightly closing sealing element (26) vorpese- left to be desired. hen is, while he is outside of the regulation area The invention is therefore based on the object ches to short-circuit the pump suction valve to create a strut of the type mentioned at the beginning- (20) taken along by the pump cylinder (19), which consists of parts that are easy to manufacture, men and lifted from the sealing element (26) a compact structure with the smallest possible construction, height and with which the target level of the driving