KR20020096392A - Suspension Simulator - Google Patents

Abstract

PURPOSE: A suspension device simulator is provided to significantly reduce parts count and manufacturing procedures, while improving reliability for suspension device test. CONSTITUTION: A suspension device simulator comprises a bed unit(32) for supporting an overall structure; a lower support plate(33); an upper support plate(34); a spring mass(35) for simulation of the partial mass of vehicle body; an un-spring mass(36) for simulation of the mass of the lower assembly of spring; two guide rods(31); a hydraulic cylinder(37) for excitation; an un-spring mass support bracket(38); two un-spring mass guide rods(39); motors(40a,40b) having accelerators for vertical movement of the spring mass; a sprocket(41); and a chain(42). The un-spring mass includes a tire(36a), a shock absorber(36b) and a support aluminum alloy member.

Description

Suspension Simulator {Suspension Simulator}

The present invention relates to a vehicle suspension simulator, and more particularly, to a simulator in which the structure of the suspension simulator is simplified and thus easy to manufacture and very close to the physical situation in a real vehicle.

In general, the vehicle suspension simulator is a device used to experimentally evaluate the performance, strength, durability, etc. of the vehicle suspension, that is, shock absorber. A conceptual diagram of a conventional general wheel suspension simulator is shown in FIG. 1.

As shown in FIG. 1, the simulator has a sprung mass that simulates the mass of a bed part 1 supporting the entire structure, a lower support plate 2, an upper support plate 3, and a part of a vehicle body. (4), unsprung mass (5) to simulate the mass of the spring subassembly, four guide rods (6) to act as guides, hydraulic cylinders for excitation, etc. Consists of. Four linear bearings 7 are provided in the sprung mass 4 and the unsprung mass 5, respectively, to enable smooth movement in the vertical direction. In FIG. 1, the tire and shock absorber mechanism constituting the unsprung mass 5 and the hydraulic cylinder located at the center between the bed 1 and the lower support plate 2 are omitted to avoid the complexity of the figure. You can easily understand its structure by reference.

FIG. 2 is an example of a vehicle suspension structure, which is composed of a strut 21, a coil spring 22, a tire 23, a control arm 24, and the like. Connected, the load acts in the direction of the load input shaft 26. This vehicle suspension is manufactured such that the strut central axis 27 of the shock absorber, the coil spring central axis 28 and the central axis 29 of the wheel are not parallel to each other and have an appropriate angle.

Therefore, in order to be able to operate exactly the same as in the actual vehicle suspension system, the suspension center simulator and the shock absorber strut shaft should be manufactured to have the same angle as the actual vehicle, but in general, the suspension suspension simulator should be manufactured. In consideration of the convenience of the image, the shock absorber strut central axis and the tire central axis are manufactured to be on the same straight line as shown in FIG. 1. At this time, however, a constant angle exists between the central axis of the coil spring and the central axis of the shock absorber strut. Therefore, the force generated by the suspension spring (22 in FIG. 2) when the tire is excited up and down in the simulator as shown in FIG. There is a slight difference from the direction of the excitation, and this difference in the direction of action of the force creates some lateral force on the suspension. The four guide rods 4 shown in Figure 1 serves to guide the suspension device to move only in the up and down direction without swinging in the lateral direction even when side force occurs in the course of the simulator. That is, the reason why the four guide rods are used in this simulator is to reliably prevent the fluctuation caused by the lateral thrust.

However, the suspension simulator shown in FIG. 1 has the following problems. In other words, four guide rods are equipped with four linear bearings (5), sprunk mass (2) and unsprung mass (3), respectively, coupled to four guide rods, four guide rods and four It is very difficult to fabricate a perfectly aligned central axis of a linear bearing. In addition, when there are center mismatches between the four linear bearings 7 and the four guide rods, there is a problem that the operation of the suspension simulator becomes unstable and the life of the device is shortened. Another problem is that the mass of the unsprung mass is very large compared to the mass in the real vehicle due to the mass increase caused by the attachment of four linear bearings and bearing housings to the unsprung mass. The similar physical situation becomes difficult to reproduce. Another problem is that when the shock absorber and tire are removed and attached to the unsprung mass 5 of FIG. 1 during the test preparation process using the suspension simulator, the sprung mass 4 having a mass of several hundred kg is easily lifted up and down. Although a device for moving in the direction is required, the conventional suspension simulator does not have an appropriate sprung mass moving device, and there are many inconveniences such as moving the sprung mass 4 upward and downward by installing a chain block in a nearby structure. .

The present invention is to solve the problems of the conventional suspension simulator as described above, first, by minimizing the number of guide rods for supporting and guiding the suspension simulator moving device is easy to manufacture the device, the operation stability of the device is It is to provide an improved suspension simulator.

Second, to provide a suspension simulator that solves the problem that the mass of the unsprung mass portion in the conventional suspension simulator is excessive than the mass in the actual vehicle.

Third, the suspension simulator (4 in Figure 1) in the suspension simulator to move the up and down direction very easily, to provide a suspension simulator that can be stopped at any position.

1 is a block diagram of a conventional one-wheel suspension simulator.

2 is a configuration diagram of a suspension device of an actual vehicle.

Figure 3 is a front view showing the overall configuration of the suspension simulator embodiment according to the present invention.

4 shows a detail of the bracket 38 which is part of FIG. 3.

* Brief description of the main parts of the drawings

4: Spur Mass of Conventional Suspension Simulator

5: Unsprung mass of conventional suspension simulator (shock absorber and tire are omitted)

6: guide rod of conventional suspension simulator

7: linear bearing of conventional suspension simulator

22: coil spring

23: tires

27: Strut of shock absorber

31: guide rod of the present invention

35: sprung mass of the present invention

36: unsprung mass of the present invention

37: Exciter of the Invention

38: sprung mass support bracket of the present invention

40a, 40b: reducer-mounted motor

The configuration and operation of the suspension simulator invention that can solve the technical problem as described above will be described in detail with reference to FIG.

Figure 3 shows the overall configuration of one embodiment of the suspension simulator according to the present invention. The notable difference between the embodiment of FIG. 3 and the conventional suspension simulator (FIG. 1) is that there are only four guide rods 6 in FIG. 1, whereas there are only two guide rods 31 in the embodiment of FIG. 3. to be. That is, the embodiment shown in FIG. 3 has a simpler structure, and therefore, the structure of the embodiment can be sufficiently explained only by the front view as shown in FIG.

The suspension simulator shown in FIG. 3 is a sprung mass 35 that simulates the mass of the bed part 32, the lower support plate 33, the upper support plate 34, and the upper part of the vehicle body supporting the entire structure. Unsprung mass (36), two guide rods (31), hydraulic cylinder (37) for excitation, and an unsprung mass support bracket (38). ), Two unsprung mass guide rods 39, sprocket mass up / down movement reducer-type motors 40a and 40b, sprockets 41, chains 42, and the like. The unsprung mass 36 is composed of a tire 36a, a shock absorber 36b, and a support aluminum alloy structure, and is manufactured to have the same mass as the unsprung mass in an actual vehicle.

When comparing FIG. 3 with FIG. 1, since only two guide rods 31 are used in FIG. 3, it may be considered that the rigidity of the structure is weak, but this is the guide rod 31 used in the case of FIG. 3. This is solved by increasing the diameter of the rod to about 1.5 times the diameter of the guide rod used in FIG.

When only two guide rods 31 are used as in the case of FIG. There is an advantage of being easy. In addition, even when two linear bearings 43 and two guide rod center mismatches exist somewhat, the operation of the suspension simulator becomes unstable and the service life becomes unstable since there is no movable structure with weak rigidity as shown in FIG. This shortening problem has an advantage of less. In addition, in the case of using two guide rods as shown in FIG. 3, the number of parts and the number of manufacturing operations are reduced compared to the case of using four guide rods as shown in FIG.

In FIG. 1, the unsprung mass is directly guided by four guide rods, and thus, four linear bearings and a bearing housing are included as part of the unsprung mass, so that the mass of the movable part is very large. . However, using the same mechanisms as 36, 38, and 39 in FIG. 3, and using aluminum alloy as a material for the supporting structure, which is a component of the unsprung mass 36, the mass of the unspring mass in FIG. Can be reduced. In addition, since the diameter of the unsprung mass guide rod 39 can be manufactured to be 1/2 or less of the diameter of the guide rod 31, the mass of the linear bearing 44 and the bearing housing included in the unsprung mass can be lightly maintained. There is a number. Therefore, in the suspension simulator shown in FIG. 3, it is possible to manufacture an unsprung mass having the same mass as in an actual vehicle.

The structure of the unsprung mass support bracket 38 of FIG. 3 is shown in detail in FIG. 4. The bracket 38 has a large diameter hole for inserting the guide rod 31 in FIG. 3 to fix the bracket and a small diameter hole for fixing the unsprung mass guide rod 39 in FIG. 3 (38c in FIG. 4). This is processed. When the bracket 38 is coupled with the guide rod 31 of FIG. 3 and the bolt is fastened to the bolt hole (38b of FIG. 4), the metal contact between the brass lining (38a of FIG. 4) and the guide rod 31 is established. And firmly fixed.

The unsprung mass 36 of FIG. 3 has a shorter horizontal length than the case of FIG. 1 (5 in FIG. 1), and consists of only two linear bearings, so that the center of the linear bearing 44 and the guide rod (39) Even if some mismatch of center exists, there is little advantage that the operation of the simulator becomes unstable and the life of the device is shortened.

When the electric motors 40a and 40b with the reducer, the sprocket 41, and the chain 42 which are the sprung mass up-and-down movement devices shown in FIG. 3 are used, the sprunk mass which has a mass of several hundred kg only by remote operation with an electrical switch is used. It can be easily moved and can be stopped firmly at an arbitrary position by the brake mechanism built in the reducer 40a. Such a sprung mass vertical movement device is conveniently used when the tire and the shock absorber, which are components of the unsprung mass 36, are attached and detached in preparation for the test using the suspension simulator. In addition, if the length of the stroke or more of the vibrator 37 having the chain 42 is released before the start of the full test, the operation of the system by the vibrator 37 is not affected at all.

As described in detail above, the present invention reduces the number of guide rods for guiding the up and down movement of the sprung mass to two, and adds a new type of guide mechanism for guiding the up and down movement of the unsprung mass. The present invention relates to a new type of suspension simulator in which a speed reducer-mounted motor is added. By using the results of the present invention, it is possible to greatly reduce the number of manufacturing parts and manufacturing maneuvers of the suspension simulator, and by manufacturing the mass of the unsprung mass to be the same as that of the actual vehicle, it is possible to increase the reliability of the suspension test. By using an attached reducer-type electric motor, it is possible to obtain the effect that the sprung mass can be easily moved up and down during test preparation.

Claims (3)

Unsprung mass consisting of one-wheel suspension, tires and accessories, sprung mass to simulate the mass of a part of the vehicle, and exciters for reciprocating the tires in a vertical direction. Suspension simulator, characterized in that the number of guide rods for guiding the movement of the sprue mass in the vertical direction is two. The method of claim 1, wherein a separate bracket is fixed to the lower portion of the guide rod installed for guiding the vertical movement of the sprung mass, and the up and down movement of the unsprung mass is guided to the bracket. Suspension simulator that enables the manufacture of the mass of an unsprung mass identical to that of a real vehicle by placing two small guide rods and an unsprung mass guide. The suspension simulator according to claim 1, wherein the top of the device includes a sprung mass vertical movement device consisting of a reducer-attached motor, a sprocket, and a chain.