JPS647290Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pit cover device and is suitable for use in a chassis dynamometer equipped with a movable roller device.

Conventionally, chassis dynamometers have been used to perform tests by reproducing the driving conditions of a vehicle on the road indoors. In this chassis dynamometer, tests are conducted with the drive wheel of the vehicle placed on a roller while the other wheel is fixed on a floor surface such as a pit cover.

However, as vehicle drive systems are adopted, one in which the rear wheels are the driving wheels (hereinafter referred to as FR vehicles) and one in which the front wheels are the driving wheels (hereinafter referred to as FF vehicles), the first FR car 1 as shown in the figure
In this case, the rear wheels are placed on the rollers 4 of the chassis dynamometer 3 which is fixedly installed in the pit 2, and the cooling device 5 is installed in front of the vehicle 1, and various measuring instruments are placed in the position of the FR vehicle 1. Install it according to your needs and perform the test. On the other hand, in the case of the FF vehicle 6, since the driving wheels are the front wheels, the front wheels are placed on the rollers 4.
Compared to the case of the FR vehicle 1, the vehicle 6 must be moved to the rear of the test chamber 7 and fixed, and the cooling device 5 and the like must also be moved accordingly. For this reason, there are drawbacks such as the complicated movement and adjustment of the cooling device 5 and the like and the need for a large testing chamber 7.

Therefore, it has been proposed to move the roller 4 of the chassis dynamometer 3 so that the FR car 1 and the FF car 6 can be tested at almost the same position in the test room. It is necessary to remove and move the pit cover 8 corresponding to the moving path of No. 4, which has the disadvantage that this moving work is very complicated.

This idea was made in view of the current situation,
To provide a pit cover device which allows a pit cover to be easily moved even when the roller of a chassis dynamometer is moved so that a test can be carried out at a substantially constant position regardless of the drive system of a vehicle. The structure of the present invention that achieves this object includes a fixing member such as a cover receiving frame disposed in the front and back direction above the pit, and a fixed pit cover fixed to the fixing member and covering the front and rear parts of the pit, respectively. , the dimension in the front-rear direction is formed to be shorter than the dimension between the rear end of the front fixed pit cover and the front end of the rear fixed pit cover, and the fixed pit cover is moved so as to cover the central part of the pit. at least one pair of links having one end rotatably attached to the fixed member and the other end rotatably attached to the pit cover; and at least one link connected to at least one of the links to move the pit cover back and forth. The pit cover can be moved to open an opening that is a gap between one of the front and rear pit covers and a fixed pit cover, and close an opening that is a gap between the other pit cover and the fixed pit cover. and a drive mechanism capable of holding the device in the raised position.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

As shown in FIGS. 2 and 3, the chassis dynamometer in which the pit cover device of the present invention is installed has a roller device 12 mounted on a slide rail 11 laid on the bottom of a pit 10, at right angles to its rotation axis. Test chamber 1 is movable in various directions, and the top of roller 13 is formed by a fixed pit cover 14, etc.
It is arranged so that it is almost at the same height as the floor surface of No. 5.
A movable pit cover 16 is installed between the two moving positions F and R of the roller device 12, and is placed on a cover receiving frame 17, which is a fixed member on the upper part of the pit 10, in a normal state. At this time, the pit cover 16 is formed so that its dimension in the front-rear direction (left-right direction in the figure) is shorter than the dimension between the rear end of the fixed pit cover 14 at the front and the front end of the fixed pit cover 14 at the rear, so that the pit cover 16 covers the center of the pit 10. At the same time, an opening 23, which is a gap between the front and rear fixed pit covers 14, is formed between the front and rear fixed pit covers 14. The moving mechanism of the pit cover 16 includes a pair of links 18 and 19 rotatably supported by pins 20 parallel to the rotational axis of the roller 13 at the front and back of the cover receiving frame 17 in the moving direction of the roller device 12. The tip portion is rotatably connected to the pit cover 16 via a pin 21, and by rotating each link 18, 19 around the pin 20, the pit cover 16 can be slid in the moving direction of the roller device 12. I can do it. Further, a protrusion 18a is formed so that the lower part of the pin 20 of at least one of the links 18 and 19 protrudes. The drive mechanism is formed by connecting two fluid pressure cylinders 22 with their base ends facing each other, one rod being rotatably connected to the protrusion 18a, and the other rod being rotatably connected to the cover receiving frame 17. movably connected. A fluid pressure supply device (not shown) is connected to these fluid pressure cylinders 22.

In the pit cover device configured as above, the fourth
In the test state of the FF vehicle shown in the figure, the roller device 12 is moved to the front F position of the test chamber 15, the pit opening 23 is formed in this part, and the pit is closed at the rear R position. Both of the two hydraulic cylinders 22 have their rods extended and the links 18,
19 is rotated to the right in the figure.

When moving the roller device 12 from this state to the rear R position to test the FR vehicle, first,
When the rod of one hydraulic cylinder 22 is retracted, each link 18,
19 is held vertically, the pit cover 16 is raised, and a moving path for the roller device 12 is secured. After moving the roller device 12 in this state, when fluid pressure is supplied to contract the rod of the other fluid pressure cylinder 22, each link 1
8 and 19 are rotated to the left as shown in FIG. 6, the pit at the front F position is closed, and an opening 23 necessary for the test is formed at the rear R position.

Incidentally, when testing the FF vehicle again, the procedure described above may be reversed.

In this way, the link mechanism and the drive mechanism that drives the link mechanism hold the pit cover in the raised position to ensure a moving path for the roller device, and also rotate left and right to form the opening of the pit at a predetermined position. Since the pit cover can be closed, it is extremely easy to move the pit cover along with the movement of the roller device.

In the above embodiment, two fluid pressure cylinders are connected in series as the drive mechanism, but any mechanism that can rotate at least one link stepwise to three positions is sufficient, and one fluid pressure cylinder It is also possible to use a motor or the like.

As specifically explained above in conjunction with the embodiments, according to the present invention, the pit cover can be easily moved as the roller device is moved, and a vehicle test using a chassis dynamometer can be carried out efficiently.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional chassis dynamometer, Figs. 2 and 3 are a front view and a plan view of an embodiment of the pit cover device of the present invention, and Figs. 4 to 6 are explanatory diagrams of operation. It is. In the drawing, 10 is a pit, 11 is a slide rail, 12 is a roller device, 13 is a roller, 14 is a fixed pit cover, 15 is a test chamber, 16 is a pit cover, 17 is a cover receiving frame, 18 and 19 are links,
20, 21 are pins, 22 is a fluid pressure cylinder, 23
is the opening, and F and R are the moving positions.

Claims (1)

[Scope of utility model registration request] A fixed member such as a cover receiving frame arranged in the front and back direction at the top of the pit, a fixed pit cover that is fixed to this fixed member and covers the front and rear parts of the pit, and a fixed pit cover whose dimension in the front and back direction is the front part. a movable pit cover that is shorter than the dimension between the rear end and the front end of the rear fixed pit cover and is adapted to cover the center of the pit between the fixed pit covers; at least one pair of links which are rotatably attached and whose other ends are rotatably attached to the pit cover; and a link which is connected to at least one of the links and which moves the pit cover back and forth to either the front or rear of the pit cover. A drive mechanism capable of opening an opening that is a gap between a pit cover and a fixed pit cover, closing an opening that is a gap between the other pit cover and the fixed pit cover, and holding the pit cover in a raised position. A pit cover device characterized by: