JP2007198875A - Pit cover device for chassis dynamometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a movable pit cover device dispensing with a large space for therein housing it. <P>SOLUTION: In moving a movable stage backward, a worker winds a cover part 81 by a winder 82, in conjunction with this move, to reduce a pit cover portion constituting the cover part 81. Further, in this event, a plurality of beam parts 83 move by being backward pushed in sequence from front beam parts 83 by a moving pit cover part 7 moving in keeping with the move of the movable stage, narrowing their intervals in sequence (a2, b2). Meanwhile, when moving the movable stage forward, the cover part 81, with one end thereof fixed to the movable stage, is drawn out from the winder 82. Further, the plurality of beam parts 83 are drawn out forward in sequence from beam parts 83 at the front by the connection of a wire 84 directly to the cover part 7 or via other beam parts 83, with spaces between them widened up to a prescribed space set by means of a wire length (a1, b1). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a movable pit cover device that covers an upper surface of a pit in which a chassis dynamometer is used.

  When testing a four-wheel drive vehicle with a chassis dynamometer, place the front wheel of the vehicle on one of the two rollers spaced apart by the wheelbase and the rear wheel of the vehicle on the other roller. The test will be conducted. Further, a chassis dynamometer capable of testing such a four-wheel drive vehicle has one of the two rollers 2 and 3 disposed in the pit 51 as shown in FIGS. 5a and 5b. May be configured as movable. By doing in this way, the space | interval of the two rollers 2 and 3 can be adjusted arbitrarily, and it can respond to the wheel base of various vehicle types.

As a technique related to a pit cover device that covers the upper surface of the pit 51 where such a chassis dynamometer is adopted, as shown in FIGS. 5a and 5b, the movement of the movable roller 2 is followed to move inside the pit 51. There is known a technique of providing a flexible floor 54 that goes in and out between the upper surface of the pit 51 (for example, Patent Document 1). Here, as shown in FIGS. 5 a and b, the flexible floor 54 forms a part of the pit cover that covers the upper surface of the pit 51, as the portion that has advanced to the upper surface of the pit 51.
JP-A-8-152380

According to the technique described in Patent Document 1, a relatively large space is required in the pit 51 to accommodate the flexible floor 54. For this reason, application of this technique hinders miniaturization of the chassis dynamometer.
Then, this invention makes it a subject to provide the movable pit cover apparatus which does not require the big space for accommodation.

  In order to achieve the above object, the present invention provides a fixed pit cover portion that covers a part of the upper surface of the pit fixed to a pit that accommodates a roller on which a wheel of an automobile is placed, and a rotational axis direction of the roller And a moving pit cover portion that covers a part of the upper surface of the pit that is installed so as to be movable in the front-rear direction with respect to the pit, the front-rear direction being a direction that is perpendicular and horizontal to the rotation axis of the roller. A pit cover device that covers a portion of the chassis dynamometer whose length in the front-rear direction changes as the moving pit cover portion moves between the moving pit cover portion and the fixed pit cover portion on the upper surface of the pit. And a plurality of beam portions arranged in the front-rear direction and spanning left and right above the pit, and supported by the plurality of beam portions. And a cover portion that covers a portion between the moving pit cover portion and the fixed pit cover portion on the upper surface of the pit, and each of the plurality of beam portions is arranged in the front-rear direction between adjacent beam portions. The cover portion is provided so as to be movable in the front-rear direction with respect to the pit, and the cover portion of the cover portion is configured so that the length in the front-rear direction of the portion covering the upper surface of the pit is variable. The surface covering the upper surface of the pit is provided so as to be able to be overlapped in an arbitrary amount within a predetermined range in the vertical direction.

  According to such a pit cover device, a portion of the pit cover that covers a portion whose length in the front-rear direction changes as the moving pit cover portion moves between the moving pit cover portion and the fixed pit cover portion on the pit upper surface. Can be formed as a pit cover having a strong structure that supports the cover portion by the beam portion, and the necessity of a large space for accommodating the pit cover device can be eliminated. That is, in such a pit cover device, the form of the pit cover device is changed to a compact form by narrowing the distance between the front and rear of the beam part and overlapping the cover part in the vertical direction with the surface of the cover part covering the upper surface of the pit. Therefore, there is no need for a large space in the pit for accommodating the pit cover device.

  More specifically, such a pit cover device includes a plurality of pit cover devices arranged in the front-rear direction between the movable pit cover portion and the fixed pit cover portion, and spanned right and left above the pit. , A flexible sheet-like cover portion that is supported by the plurality of beam members and covers a portion between the moving pit cover portion and the fixed pit cover portion on the pit upper surface, and a winding device Each of the plurality of beam members is provided so as to be movable in the front-rear direction with respect to the pit so that a distance in the front-rear direction between adjacent beam members is variable, and the winding device In this case, the cover portion may be wound in a roll shape with the horizontal direction as a winding axis, and the length of the portion of the cover portion covering the top surface of the pit may be changed.

  Alternatively, the pit cover device as described above, specifically, a plurality of pit cover devices arranged in the front-rear direction between the moving pit cover portion and the fixed pit cover portion and spanned to the left and right above the pit. A beam member and a plurality of cover plates that are arranged in the front-rear direction and cover a portion between the moving pit cover portion and the fixed pit cover portion on the upper surface of the pit, each supported by the beam member. Good. Here, in this case, each of the plurality of beam members is provided to be movable in the front-rear direction with respect to the pit so that the front-rear direction interval between adjacent beam members is variable, The plate has a second amount smaller than the first amount on the cover plate adjacent in the one direction from the state where the plate overlaps the cover plate adjacent in one direction of the front or rear direction by the first amount. By changing the amount of the cover plate adjacent to the one direction of each cover plate by changing the amount of overlap on the cover plate adjacent to the one direction, by changing the amount of the cover plate adjacent to the one direction, The length in the front-rear direction of the portion where the plurality of cover plates cover the upper surface of the pit is variable.

  Alternatively, the pit cover device as described above is specifically composed of a plurality of cover units arranged in the front-rear direction and arranged in the front-rear direction between the movable pit cover part and the fixed pit cover part. You may make it comprise. However, each of the cover units is supported by a beam portion spanning right and left on the upper portion of the pit and the beam portion disposed on the upper portion of the beam portion, and the movable pit cover portion and the fixed pit on the upper surface of the pit. And the cover portion covering a part of the portion between the cover portions. In addition, as each cover unit moves forward and backward, the cover unit is moved from a state where the cover unit overlaps a first unit on a cover unit adjacent in one of the front and rear directions. The cover unit is provided so as to change to a state where it overlaps a second amount smaller than the first amount on the cover unit adjacent in the one direction or a state where it does not overlap the cover unit adjacent to the one direction. And the length of the front-back direction of the part which the cover part of the said several cover unit covers the upper surface of the said pit by the movement of the said cover unit is made variable.

  As described above, according to the present invention, it is possible to provide a pit cover device that does not require a large space for accommodation.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 schematically shows the configuration of the chassis dynamometer according to this embodiment.
Here, FIG. 1a is a schematic top view of the chassis dynamometer, and FIGS. 1b and 1c are schematic side views of the chassis dynamometer.
As shown in the figure, this chassis dynamometer is a chassis dynamometer for a four-wheel drive vehicle. The vehicle is advanced on the pit 1 and one of the rear wheel and the front wheel is positioned on the first roller 2. In addition, after positioning the one of the rear wheels and the front wheels not positioned on the first roller 2 on the second roller 3, the vehicle is fixed to the pit 1 and the fixed vehicle is caused to travel. However, various characteristics of the automobile are measured by a dynamometer connected to the first roller 2 and a dynamometer connected to the second roller 3. Such a chassis dynamometer may be configured such that the rear wheel is placed on the first roller 2 and the front wheel is placed on the second roller 3. Conversely, the front wheel is placed on the first roller 2. The rear wheel may be placed on the placing second roller 3. However, in the following, for convenience of explanation, as shown in the figure, a case where measurement is performed with a rear wheel placed on the first roller 2 and a front wheel placed on the second roller 3 will be described as an example. In the following description, the front-rear direction of the automobile with the rear wheel placed on the first roller 2 and the front wheel placed on the second roller 3 is the front-rear direction of the chassis dynamometer, and the left-right direction of the automobile is the left-right direction of the chassis dynamometer. The direction is described.

  Here, the second roller 3 is fixedly installed with respect to the pit 1, but the first roller 2 is arranged with respect to the pit 1 in accordance with the wheel base of the automobile as shown in FIGS. 1b and 1c. Are installed on a movable stage 4 movably provided in the front-rear direction. The chassis dynamometer includes a stage moving unit 5 for moving the movable stage 4 in the front-rear direction with respect to the pit 1. The stage moving unit 5 includes a motor 51 fixed to the pit 1, a motor It can be constituted by a ball screw 52 that rotates by 51 and moves the movable stage 4 back and forth.

  The pit cover covering the upper surface of the pit 1 includes a fixed pit cover portion 6 fixed to the pit 1 and constituting a pit cover portion around the top of the second roller 3 and a pit cover portion around the rear end. A movable pit cover portion 7 constituting a pit cover portion around the top of the first roller 2 fixed to the movable stage 4, and a movable stage 4 having one end fixed to the pit 1 and the other end fixed to the movable stage 4. As shown in FIGS. 1b and 1c, the two gaps between the fixed pit cover portion 6 and the movable pit cover portion 7 that respectively extend before and after the movable pit cover portion 7 are covered. It is comprised from the two expansion-contraction pit cover apparatuses 8 which respectively comprise a pit cover part.

Here, the two telescopic pit cover devices 8 have a symmetrical configuration in the front-rear direction. Hereinafter, the configuration of the extendable pit cover device 8 provided on the rear side of the pit 1 will be described as an example.
In FIG. 2, the structure of the expansion-contraction pit cover apparatus 8 provided in the back side of the pit 1 is shown.
2a1 schematically shows the upper surface of the telescopic pit cover device 8, FIG. 2b1 schematically shows the side surface of the telescopic pit cover device 8, and FIG. The cross section by the cross section line AA in the inside is schematically represented.
As shown in the figure, the telescopic pit cover device 8 includes a flexible sheet-like cover portion 81 having one end fixed to the rear end of the movable pit cover portion 7 and fixing of a gap covered by the telescopic pit cover device 8. A winding device 82 that winds up the cover portion 81 that is fixedly installed on the pit 1 at the cover side end, and a plurality of beam portions 83 that function as beams that support the cover portion 81 and whose left and right ends are supported by the pit 1. And have.

Here, the plurality of beam portions 83 are supported by the pit 1 so as to be movable. The plurality of beam portions 83 are arranged in the front-rear direction in a state of being sequentially connected by wires 84, and the foremost beam portion 83 is connected to the movable pit cover portion 7 by wires 84.
Now, the operation of the telescopic pit cover device 8 will be described.
Now, when the movable stage 4 is moved rearward (rightward in FIGS. 2a1 and b1) from the state shown in FIGS. 2a1, b1, and c1, the operator uses the winding device 82 in conjunction with the movement to cover the cover unit. 81 is wound up. Then, as shown in FIGS. 2 a 2 and b 2, the pit cover portion formed by the cover portion 81 is also reduced as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 is reduced as the movable stage 4 is moved. I will do it. Here, FIG. 2a2 schematically shows the upper surface of the telescopic pit cover device 8, and FIG. 2b2 schematically shows the side surface of the telescopic pit cover device 8. FIG.

On the other hand, when the movable stage 4 is moved rearward, the plurality of beam portions 83 are sequentially pushed and moved rearward from the front beam portion 83 by the moving pit cover portion 7 that moves as the movable stage 4 moves. I will gradually narrow the interval.
Next, when moving the movable stage 4 forward (leftward in FIGS. 2a2 and b2) from the state shown in FIGS. 2a2 and b2, the operator can freely pull out the cover 81 from the winding device 82. State. Then, as shown in FIGS. 2 a 1 and b 2, as the movable stage 4 moves, the cover portion 81 whose one end is fixed to the movable stage 4 is pulled out from the winding device 82. As a result, as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 is enlarged, the pit cover portion formed by the cover portion 81 is also enlarged.

  On the other hand, when the movable stage 4 is moved forward, the plurality of beam portions 83 are connected to the moving pit cover portion 7 that moves along with the movement of the movable stage 4 or by connection of the wires 84 via the other beam portions 83. Then, the beam is sequentially drawn forward from the front beam portion 83, and the interval is sequentially expanded to a predetermined interval set by the wire length.

The embodiment of the present invention has been described above.
By the way, the above-described telescopic pit cover device 8 may be configured as follows.
That is, as shown schematically in FIGS. 3a and 3b, the side surface of the expansion / contraction pit cover device 8 functions as a beam that supports the cover plate 91 and the plurality of cover plates 91 arranged in the front-rear direction. The left and right ends may be constituted by a plurality of beam portions 92 and fixed beam portions 93 supported by the pits 1.

  Here, the plurality of cover plates 91 are arranged in the front-rear direction in a state of being sequentially connected by wires 94, and the frontmost cover plate 91 includes a front surface of the frontmost beam portion 92 and a moving pit cover. A bent portion 911 that contacts the rear surface of the portion 7 is formed. Further, in the state in which the moving pit cover portion 7 shown in FIG. 3A has moved to the forefront, the rear side end portion of each cover plate 91 is positioned on the one rear side cover plate front side end portion. The size of each cover plate 91 and the length of the wire 94 between the cover plates 91 are set.

  Moreover, the some beam part 92 is supported by the pit 1 so that a movement is possible. The plurality of beam portions 92 are arranged in the front-rear direction in a state of being sequentially connected by wires 95, and the foremost beam portion 92 is connected to the movable pit cover portion 7 by a wire 95.

Now, the operation of the telescopic pit cover device 8 will be described.
If the movable stage 4 is moved rearward (rightward in FIG. 3a) from the state shown in FIG. 3a, the plurality of beam portions 92 move as the movable stage 4 moves as shown in FIG. 3b. The moving pit cover portion 7 is pushed and moved sequentially backward from the front beam portion 92, and the interval is gradually reduced. Further, the plurality of cover plates 91 are also sequentially pushed backward from the front cover plate 91 by the moving pit cover portion 7 and moved onto the rear cover plate 91. As a result, the pit cover portion formed by the cover plate 91 is reduced as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 is reduced.

  Next, when the movable stage 4 is moved forward (leftward in FIG. 3b) from the state shown in FIG. 3b, the plurality of beam portions 92 are moved along with the movement of the movable stage 4 as shown in FIG. 3a. By connecting the wire 95 directly to the moving pit cover portion 7 or via another beam portion 92, the wire 95 is sequentially drawn forward from the front beam portion 92, and the interval is sequentially set according to the wire length. Expand to the interval.

  Further, as the foremost beam portion 92 moves forward, the foremost cover plate 91 is pushed and moved forward by the foremost beam portion 92, and the remaining cover plate 91 is moved. As shown in FIG. 3a, as the foremost cover plate 91 is moved, the second cover is connected to the foremost cover plate 91 directly or via a wire 94 via another cover plate 91. It is sequentially drawn forward from the plate 91 and developed forward. As a result, as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 increases, the pit cover portion formed by the cover plate 91 extends.

Alternatively, the above-described telescopic pit cover device 8 may be configured as follows.
That is, from a plurality of cover metal fittings 96 in which the left and right ends are supported by the pits 1 arranged in the front-rear direction, as schematically shown in FIG. You may make it comprise.
Here, the plurality of cover metal fittings 96 are arranged in the front-rear direction in a state of being sequentially connected by the wires 97, and the frontmost cover metal fittings 96 are connected to the movable pit cover portion 7 by the wires 97. . Each cover metal fitting 96 is a metal fitting comprising an upper arm 961 and a lower arm 962 each having a U-shaped cross section as shown in FIG. In addition, each cover metal fitting 96 is formed by forming an upper arm 961 of two arms that form a cross-section of the pit cover as a part of the pit cover in the unfolded state as shown in FIG. 4a. The lower arm 962 functions as a beam that supports a part of the pit cover. 4A, the front end of the upper arm 961 that forms a part of the pit cover of each cover metal piece 96 is the front cover. The size of each cover metal piece 96, the length of the wire 97 between the movable pit cover portion 7 and the front cover metal piece 96, and the distance between each cover metal piece 96 so as to be positioned on the arm 961 above the metal piece 96. The length of the wire 97 is set.

Now, the operation of the telescopic pit cover device 8 will be described.
If the movable stage 4 is moved rearward (rightward in FIG. 4a) from the state shown in FIG. 4a, the plurality of cover fittings 96 move as the movable stage 4 moves as shown in FIG. 4b. The upper arm 961 that forms a part of the pit cover of each cover metal piece 96 is sequentially pushed rearward from the front cover metal piece 96 by the moving pit cover part 7, and is below the upper arm 961 of the rear cover metal piece 96. The distance between the lower arms 962 that function as the beams of the respective cover fittings 96 gradually decreases as the movement proceeds sequentially. As a result, the pit cover portion formed by the cover metal fitting 96 is reduced as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 is reduced.

  Next, when the movable stage 4 is moved forward (leftward in FIG. 4b) from the state shown in FIG. 4b, the plurality of cover fittings 96 are moved along with the movement of the movable stage 4 as shown in FIG. 4a. By connecting the wire 97 directly to the moving moving pit cover portion 7 or via another cover metal fitting 96, the wire 97 is sequentially drawn forward from the front cover metal fitting 96, and each cover metal fitting 96 functions as a beam. Between the upper and lower arms 962 with a front-rear space therebetween, and the overlapping of the upper arms 961 is reduced. As a result, the pit cover portion formed by the upper arm 961 expands as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 increases.

Moreover, you may make it comprise the above expansion-contraction pit cover apparatus 8 as follows.
That is, from the cover unit 98 in which the left and right ends are supported by the pits 1 arranged in the front-rear direction so that the side surface of the telescopic pit cover device 8 is schematically shown in FIGS. You may make it comprise.
Here, each cover unit 98 covers the front half of the upper surface on the upper surface of a U-shaped base portion 981 whose cross section is opened downward, as shown schematically in FIG. The flat plate 982 has a shape fixed so as to protrude to the side.
4d and 4e, each cover unit 98 is movable within a predetermined range forward and backward with the adjacent cover unit 98 by a connecting rod 99 that is loosely fitted to the base portion 981 of each cover unit 98. It is connected. The base portion 981 of the front cover unit 98 is connected to the moving pit cover portion 7. The flat plate 982 of each cover unit 98 and the exposed upper surface of the base portion form a part of the pit cover, and the base portion 982 functions as a beam that supports a part of the formed pit cover.

Now, the operation of the telescopic pit cover device 8 will be described.
If the movable stage 4 is moved rearward (rightward in FIG. 4d) from the state shown in FIG. 4d, the plurality of cover units 98 move as the movable stage 4 moves as shown in FIG. 4e. The moving pit cover portion 7 is sequentially pushed backward from the front cover unit 98 so that the rear portion of the base portion 981 of each cover unit 98 moves so as to overlap the flat plate 982 of the rear cover unit 98. . As a result, as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 is reduced, the pit cover portion formed by the cover unit 98 is reduced.

  Next, when the movable stage 4 is moved forward (leftward in FIG. 4e) from the state shown in FIG. 4e, the plurality of cover units 98 are moved along with the movement of the movable stage 4 as shown in FIG. 4d. By connecting to the moving pit cover portion 7 directly or via a connecting rod 99 via another cover unit 98, the moving pit cover portion 7 is sequentially drawn forward from the front cover unit 98, and a space between the base portion 981 and the front and rear is separated. Arranged. As a result, the pit cover portion formed by the cover unit 98 expands as the gap between the fixed pit cover portion 6 and the movable pit cover portion 7 increases.

The embodiment of the present invention has been described above.
According to each pit cover apparatus as described above, a portion whose length in the front-rear direction changes as the moving pit cover portion 7 moves between the moving pit cover portion 7 and the fixed pit cover portion 6 on the upper surface of the pit 1 is covered. It is possible to eliminate the necessity of a large space for accommodating the pit cover device while forming the pit cover of the portion as a pit cover having a strong structure that supports the cover surface by the beam. That is, each pit cover device as described above narrows the front-rear interval of the part functioning as a beam, and overlaps the part forming the cover in the vertical direction by winding up and stacking, so that the form is Since it can be changed to a compact form, there is no need for a large space in the pit 1 or the like for accommodating the pit cover device.

It is a figure which shows the structure of the chassis dynamometer which concerns on embodiment of this invention. It is a figure which shows the structure of the expansion-contraction pit cover apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the expansion-contraction pit cover apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the expansion-contraction pit cover apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the conventional pit cover apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pit, 2 ... 1st roller, 3 ... 2nd roller, 4 ... Movable stage, 5 ... Stage moving part, 6 ... Fixed pit cover part, 7 ... Moving pit cover part, 8 ... Telescopic pit cover apparatus, 51 ... Motor, 52 ... Ball screw, 81 ... Cover part, 82 ... Winding device, 83 ... Beam part, 84 ... Wire, 91 ... Cover plate, 92 ... Beam part, 93 ... Fixed beam part, 94 ... Wire, 95 ... Wire, 96 ... cover metal fitting, 97 ... wire, 98 ... cover unit, 99 ... connecting rod.

Claims (4)

A fixed pit cover portion that covers a part of the upper surface of the pit fixed to a pit containing a roller on which a wheel of an automobile is placed, and a rotation axis direction of the roller is a left-right direction and is perpendicular to the rotation axis of the roller Further, the movement of the upper surface of the pit of a chassis dynamometer including a moving pit cover portion that covers a part of the upper surface of the pit that is installed to be movable in the front-rear direction with respect to the pit, with the horizontal direction being the front-rear direction. A pit cover device that covers a portion whose length in the front-rear direction changes with the movement of the moving pit cover portion between the pit cover portion and the fixed pit cover portion,
Between the moving pit cover portion and the fixed pit cover portion, a plurality of beam portions arranged in the front-rear direction and bridged to the left and right above the pit,
A cover portion that is supported by the plurality of beam portions and covers a portion between the moving pit cover portion and the fixed pit cover portion on the pit upper surface,
Each of the plurality of beam portions is provided to be movable in the front-rear direction with respect to the pit so that the distance in the front-rear direction between adjacent beam portions is variable,
The cover portion may overlap the surface covering the top surface of the pit of the cover portion with an arbitrary amount within a predetermined range in the vertical direction so that the length in the front-rear direction of the portion covering the top surface of the pit is variable. A pit cover device for a chassis dynamometer, wherein the pit cover device is provided so as to be able to do so.
A fixed pit cover portion that covers a part of the upper surface of the pit fixed to a pit containing a roller on which a wheel of an automobile is placed, and a rotation axis direction of the roller is a left-right direction and is perpendicular to the rotation axis of the roller Further, the movement of the upper surface of the pit of a chassis dynamometer including a moving pit cover portion that covers a part of the upper surface of the pit that is installed to be movable in the front-rear direction with respect to the pit, with the horizontal direction being the front-rear direction. A pit cover device that covers a portion whose length in the front-rear direction changes with the movement of the moving pit cover portion between the pit cover portion and the fixed pit cover portion,
Between the moving pit cover portion and the fixed pit cover portion, a plurality of beam members arranged in the front-rear direction and bridged to the left and right above the pit,
A flexible sheet-like cover portion covering the portion between the moving pit cover portion and the fixed pit cover portion on the upper surface of the pit, supported by the plurality of beam members;
A winding device,
Each of the plurality of beam members is provided so as to be movable in the front-rear direction with respect to the pit so that the distance in the front-rear direction between adjacent beam members is variable.
The winding device winds up the cover portion in a roll shape with the right and left direction as a winding axis, and changes the length in the front-rear direction of the portion where the cover portion covers the upper surface of the pit. Dynamometer pit cover device.
A fixed pit cover portion that covers a part of the upper surface of the pit fixed to a pit containing a roller on which a wheel of an automobile is placed, and a rotation axis direction of the roller is a left-right direction and is perpendicular to the rotation axis of the roller Further, the movement of the upper surface of the pit of a chassis dynamometer including a moving pit cover portion that covers a part of the upper surface of the pit that is installed to be movable in the front-rear direction with respect to the pit, with the horizontal direction being the front-rear direction. A pit cover device that covers a portion whose length in the front-rear direction changes with the movement of the moving pit cover portion between the pit cover portion and the fixed pit cover portion,
Between the moving pit cover portion and the fixed pit cover portion, a plurality of beam members arranged in the front-rear direction and bridged to the left and right above the pit,
A plurality of cover plates each supported by the beam member, arranged in the front-rear direction and covering a portion between the moving pit cover portion and the fixed pit cover portion on the upper surface of the pit;
Each of the plurality of beam members is provided so as to be movable in the front-rear direction with respect to the pit so that the distance in the front-rear direction between adjacent beam members is variable.
Each of the cover plates is smaller than the first amount on the cover plate adjacent in the one direction from the state where the first plate overlaps the cover plate adjacent in one direction of the front or rear direction. The amount of overlap on the cover plate adjacent to the one direction is provided so as to be changeable until the second amount overlaps, and the amount of the cover plate overlapping on the cover plate adjacent to the one direction The pit cover device for a chassis dynamometer is characterized in that the length in the front-rear direction of the portion where the plurality of cover plates cover the upper surface of the pit can be changed by changing.
A fixed pit cover portion that covers a part of the upper surface of the pit fixed to a pit containing a roller on which a wheel of an automobile is placed, and a rotation axis direction of the roller is a left-right direction and is perpendicular to the rotation axis of the roller Further, the movement of the upper surface of the pit of a chassis dynamometer including a moving pit cover portion that covers a part of the upper surface of the pit that is installed to be movable in the front-rear direction with respect to the pit, with the horizontal direction being the front-rear direction. A pit cover device that covers a portion whose length in the front-rear direction changes with the movement of the moving pit cover portion between the pit cover portion and the fixed pit cover portion,
A plurality of cover units arranged in the front-rear direction between the movable pit cover part and the fixed pit cover part, and provided with a cover unit that is movable in the front-rear direction;
Each of the cover units is supported by a beam portion spanning right and left on the upper portion of the pit, and the beam portion disposed on the upper portion of the beam portion, and the movable pit cover portion and the fixed pit cover portion on the pit upper surface. The cover portion covering a part of the portion between,
As each cover unit moves forward and backward, the cover portion is overlapped with a first amount on the cover unit adjacent to one of the front and rear directions, and the cover portion is It changes to a state where it overlaps with a second amount smaller than the first amount on a cover unit adjacent in one direction or a state where it does not overlap with a cover unit adjacent to the one direction. A pit cover device for a chassis dynamometer, characterized in that the lengths of the front and rear direction of the portions where the cover portions of the plurality of cover units cover the upper surface of the pit are variable.