JP7431124B2 - Vehicle restraints and chassis dynamometers - Google Patents

Description

The present invention relates to a technique for restraining a vehicle under test to a chassis dynamometer.

In a chassis dynamometer that measures various characteristics of a vehicle by rotating the wheels of the vehicle on rollers, it is necessary to perform measurements while restraining the vehicle so that the wheels remain correctly positioned on the rollers.

A technique for restraining a car in this way is a technology in which a bearing that rotatably supports a member removably fixed to the wheel hub of the car and a rail fixed to the floor are connected using multiple rod-shaped members. (For example, Patent Document 1) is known.

JP2016-102712A

According to the technique described above, a relatively large space is required for restraining the vehicle. Additionally, when restraining a vehicle, it is necessary to move the rod-shaped member between the storage location and the chassis dynamometer, and to connect the rod-shaped member to the rail at an appropriate position relative to the vehicle being tested. Yes, the work load is heavy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vehicle restraint device that can restrain a vehicle with a simpler operation.

In order to achieve the above object, the present invention provides a vehicle restraint device for a chassis dynamometer that restrains a vehicle whose wheels are placed on rollers whose tops are exposed through openings provided in the floorboard, and a wheel hub of the wheels. a hub connecting part including a fixing part that is detachably connected to the fixing part; a shaft support that rotatably supports the fixing part; a support part that supports the hub coupling part; It is equipped with an elevating device. However, the direction of the rotation axis of the roller is the left-right direction, and the direction perpendicular and horizontal to the rotation axis of the roller is the front-rear direction. The fixed part is installed in a position where the position in the front-rear direction of the rotation axis of the fixing part matches the position in the front-rear direction of the rotation axis of the roller, and the position in the left-right direction is variable.

According to such a vehicle restraint system, the position of the vehicle restraint system in the left and right direction is adjusted according to the vehicle to be tested, and the height of the hub connecting part is adjusted using a lifting device, and the fixed part is moved to the wheel. Vehicles can be restrained with the simple task of securing the vehicle to the vehicle.

This vehicle restraint device may be configured such that the support portion supports the hub connecting portion movably within a predetermined range in the left-right direction using a damper.
Further, in the above vehicle restraint device, the supporting portion may be supported by a vertically movable movable portion that the lifting device may include so as to allow movement within a predetermined range in the vertical direction with respect to the movable portion. good.

Further, in this case, the lifting device may include a load detection device that detects a load applied from the support portion to the movable portion.
Further, the elevating device may include a loading device that applies a vertical load to the support portion.
Further, the present invention provides a chassis dynamometer equipped with the vehicle restraint device as described above, in which a direction away from a vehicle in which wheels are placed on the rollers in the left-right direction is defined as an outward direction, and a direction from a position covering the opening is The present invention provides a chassis dynamometer including a roller cover that is movable on the floor plate to a position outside the opening that does not cover the opening. Here, the vehicle restraint device is installed on the roller cover.

By installing the vehicle restraint system on the roller cover that can be moved horizontally on the floor plate in this way, the movement of the roller cover allows the vehicle restraint system to be adjusted horizontally to match the tread width of the vehicle being tested. The position can be adjusted. Further, even if the vehicle restraint device is always installed on the roller cover, it does not interfere with various operations, so there is no need to move the vehicle restraint device between the storage location and the installation location.

The chassis dynamometer also includes a safety fence, at least a portion of which is openable and closable, installed on the roller cover at a position outward from the vehicle restraint device installed on the roller cover. It's fine.

As described above, according to the present invention, a vehicle can be restrained with a simpler operation.

FIG. 1 is a diagram showing a chassis dynamometer according to an embodiment of the present invention. 1 is a diagram showing a vehicle restraint device according to an embodiment of the present invention. 1 is a diagram showing details of a vehicle restraint device according to an embodiment of the present invention. FIG. 1 is a diagram showing details of a vehicle restraint device according to an embodiment of the present invention. FIG. 1 is a diagram showing a state in which a car is restrained by a vehicle restraint device according to an embodiment of the present invention. 1 is a diagram showing a safety fence according to an embodiment of the present invention. It is a figure showing other examples of the vehicle restraint device concerning an embodiment of the present invention.

Embodiments of the present invention will be described below.
FIG. 1 schematically shows the configuration of a chassis dynamometer according to this embodiment.
Here, FIG. 1a shows the top surface of the chassis dynamometer, and FIG. 1b shows the side surface of the chassis dynamometer.
As shown in Fig. 1a, the chassis dynamometer has a structure 1 whose upper surface serves as a floor plate for the vehicle under test, and four rollers 2 arranged in the front, rear, left, and right directions under the floor plate. Each roller 2 is arranged so that its top portion is exposed from each of four openings 3 on the front, rear, left and right sides provided in the floorboard.

The chassis dynamometer also includes four roller covers 4 corresponding to the four openings 3, and each roller cover 4 is arranged along a rail 5 provided on the floor plate as shown in FIGS. 1a and 1c. , can be moved left and right between a position outside the corresponding opening 3 in the left-right direction and a position where the corresponding opening 3 is covered with the roller cover 4 .

Further, the left front roller 2 is a roller 2 for the left front wheel of a car, the right front roller 2 is a roller 2 for a right front wheel of a car, and the left rear roller 2 is a roller 2 for a left rear wheel of a car. The right rear roller 2 is the roller 2 for the right rear wheel of the car, and as shown in Fig. 1b, d, the two rollers 2 for the rear wheel are connected to the floor plate above, the opening 3, and the roller cover 4. The two rollers 2 for the rear wheels can be moved backwards according to the wheelbase of the vehicle to be tested, and the rollers 2 for the front wheels and the rollers 2 for the rear wheels can be moved in the front and rear directions. You can adjust the distance in the front and back direction. However, instead of the two rollers 2 for the rear wheels, the two rollers 2 for the front wheels may be movable in the longitudinal direction, or both the two rollers 2 for the rear wheels and the two rollers 2 for the front wheels may be movable. may be movable in the front-back direction.

A vehicle restraint device 6 is fixed onto each of the four roller covers 4.
The vehicle restraint device 6 on the left front roller cover 4 is a vehicle restraint device 6 for the left front wheel used to restrain the left front wheel of a car, and the vehicle restraint device 6 on the right front roller cover 4 is used for restraining the left front wheel of a car. This is a vehicle restraint device 6 for the right front wheel used for restraint, and the vehicle restraint device 6 on the left rear roller cover 4 is a vehicle restraint device 6 for the left rear wheel used for restraining the left rear wheel of the automobile. The vehicle restraint device 6 on the rear roller cover 4 is a right rear wheel vehicle restraint device 6 used to restrain the right rear wheel of the automobile, and each moves together with the roller cover 4.

Although not shown, a safety fence is also installed above each roller cover 4. This safety fence will be described later.
Here, the vehicle restraint device 6 for the left front wheel and the vehicle restraint device 6 for the right front wheel have a laterally symmetrical configuration, and the vehicle restraint device 6 for the left front wheel and the vehicle restraint device 6 for the left rear wheel are The vehicle restraint device 6 for the right front wheel and the vehicle restraint device 6 for the right rear wheel have a symmetrical configuration in the front and rear.

The vehicle restraint device 6 will be described below, taking the vehicle restraint device 6 for the left front wheel as a representative example.
Figures 2a, b, and c show the configuration of the vehicle restraint device 6 for the left front wheel.
2a shows the left side of the vehicle restraint device 6, FIG. 2b shows the rear surface of the vehicle restraint device 6, and FIG. 2c shows the top surface of the vehicle restraint device 6.
As shown in FIGS. 2a, b, and c, the vehicle restraint device 6 includes a hub connecting block 61 protruding to the right, a support block 62, and a lifting device 63 that lifts and lowers the support block 62 up and down. The support block 62 is provided with a spherical bearing 621 that supports the hub connection block 61.

As shown in FIG. 2d, the hub connection block 61 includes a fixed part 611, a shaft support 612 that rotatably supports the fixed part 611 using a bearing, and a connection whose left end side is supported by the support block 62 with a spherical bearing 621. The right end of the connecting portion 613 is connected to the shaft support 612. By fixing the fixing part 611 to the wheel hub using an extension bolt screwed into the hub bolt of the wheel hub of the vehicle, the vehicle restraint device 6 rotatably restrains the wheel of the vehicle via the hub connecting block 61. be able to.

Here, the rotation axis of the fixed part 611 of the hub connecting block 61 is in the left-right direction, and the position of the rotation center of the fixed part 611 of the hub connecting block 61 in the front-rear direction is the same as the rotation center of the roller 2 for the left front wheel in the front-rear direction. The vehicle restraint device 6 for the left front wheel is arranged on the roller cover 4 so as to match the position. The same applies to the vehicle restraint devices 6 other than the vehicle restraint device 6 for the left front wheel. The vehicle restraint device 6 is arranged so as to coincide with the longitudinal position of the center of rotation of the roller 2 for the corresponding wheel.

Next, FIG. 3 shows the configuration of the support block 62.
3a shows the top surface of the support block 62, FIG. 3b shows the bottom surface of the support block 62, FIG. 3c shows the rear surface of the support block 62, FIG. 3d shows the left surface of the support block 62, and FIG. 3e shows the support block 62 from diagonally above. FIG. 3f shows the support block 62 as seen from diagonally below, FIG. 3g shows the cross-sectional end taken along line A-A in FIG. 3c, and FIG. 3h shows the cross-sectional end taken along line B-B in FIG. 3d. represents.

As shown in the figure, the support block 62 includes the above-mentioned spherical bearing 621, a base 622, a guide member 623, a movable plate 624, an adjustment plate 625, four linear motion bearings 626, and a damper 627 whose damping force can be adjusted. .

The front range of the base 622 shown by X1 in FIG. 3d is called the supported part, and the rear range of the base 622 shown by X2 in FIG. 3d is called the stage part. Two guide through-holes 628 are provided, and one supported through-hole 629 is a hole that passes through the base 622 in the upper and lower directions. Further, the four linear motion bearings 626 are provided above and below the two guide through holes 628 so as to guide the linear motion of the base 622 along the linear motion axis passing through the guide through holes 628.

Further, the stage portion of the base 622 has a cavity below the upper surface that is open downward and rearward and surrounded by the front surface, top surface, left surface, and right surface that connects to the supported portion, and an opening 6221 is provided on the upper surface. There is.

The movable plate 624 has a tongue part 6241 that protrudes downward in the center part, and the tongue part 6241 passes through an opening 6221 on the upper surface of the stage part of the base 622 and extends into the cavity of the stage part of the base 622. It is placed on the top surface of the stage portion of the base 622.

A damper 627 is provided in the cavity of the stage portion of the base 622 so as to connect the base 622 and the tongue portion 6241 in the left-right direction. Further, the horizontal size of the opening 6221 on the top surface of the stage portion of the base 622 is larger than the horizontal size of the tongue portion 6241, and the movable plate 624 is configured to move the damper within a predetermined range in the horizontal direction with respect to the base 622. It can move while receiving the force of 627.

Next, the guide member 623 is fixed on the upper surface of the stage portion of the base 622 so as to guide the movement of the movable plate 624 in the left-right direction back and forth.
An adjustment plate 625 is fixed onto the upper surface of the movable plate 624 with bolts passed through four elongated holes provided in the adjustment plate 625. Further, this adjustment plate 625 has a portion that protrudes to the right than the other portion of the support block 62, and a spherical bearing 621 that connects the hub connecting block 61 is provided in this protruding portion.

Therefore, in a state where the hub connecting block 61 supported by the spherical bearing 621 is connected to the wheel of the automobile, the hub connecting block 61 and the wheel are damped by the damper 627 within a predetermined range in the left and right direction with respect to the base 622. Can be moved.

The configuration of the support block 62 has been described above.
Returning to FIG. 2, as shown in FIG. 2a, the front supported portion of the base 622 of the support block 62 is inserted into the lifting device 63.
Inside the casing of the lifting device 63, two guide poles 631 extending in the vertical direction and a ball screw shaft 632 extending in the vertical direction are provided. As shown in the arrangement seen from above in FIG. 2c, the two guide poles 631 are arranged behind the ball screw shaft 632 and on the left and right sides of the ball screw shaft 632.

Further, inside the lifting device 63, a motor 633 that rotates the ball screw shaft 632, and a lifting block 634 that supports the supported portion of the base 622 of the support block 62 and moves up and down as the ball screw shaft 632 rotates are provided. ing.

As seen from the left in FIG. 4a and from diagonally above in FIG. 4b, the two guide poles 631 pass through the two guide through holes 628 of the base 622, and The vertical movement of the base 622 along the two guide poles 631 is guided by four linear motion bearings 626 provided above and below the through hole 628 .

The elevating block 634 includes a ball screw nut 6341 that forms a ball screw together with the ball screw shaft 632, an elevating table 6342 connected to the lower part of the ball screw nut, and a buffer member 6343 made of rubber, spring, resin, or the like.

As shown in FIG. 4a, the lifting platform 6342 has a U-shape that opens to the right when viewed from left to right, and includes an upper part 63421, a lower part 63422, and a front part 63423 that vertically connects the upper part 63421 and the lower part 63422. The ball screw shaft 632 vertically passes through holes provided in an upper part 63421 and a lower part 63422. Note that the holes provided in the upper part 63421 and the lower part 63422 of the lifting table 6342 are larger than the diameter of the ball screw shaft 632, and the lifting table 6342 and the ball screw shaft 632 are not in contact with each other.

A buffer member 6343 is arranged above the lower part 63422 of the lifting table 6342, and the ball screw shaft 632 vertically passes through a hole provided in the buffer member 6343. Note that the hole provided in the buffer member 6343 is larger than the diameter of the ball screw shaft 632, and the buffer member 6343 and the ball screw shaft 632 are not in contact with each other.
Between the buffer member 6343 and the upper part 63421 of the lifting platform 6342, the ball screw shaft 632 passes through the supported through hole 629 of the base 622, and the base 622 is placed on the buffer member 6343. It is supported by a lifting platform 6342 via a buffer member 6343. Further, there is a gap in the vertical direction between the base 622 and the upper part 63421 of the lifting table 6342, and the base 622 can move up and down with respect to the lifting table 6342 within this gap. Note that the diameter of the supported through hole 629 of the base 622 is larger than the diameter of the ball screw shaft 632, and the base 622 and the ball screw shaft 632 are not in contact with each other.

In such a configuration, as shown in FIGS. 4c and 4d, when the ball screw shaft 632 is rotated, the elevating table 6342 connected to the ball screw nut 6341 moves up and down, and the base 622 is placed on the buffer member 6343 of the elevating table 6342. The support block 62 on which is supported moves up and down, and the hub connection block 61 supported by the spherical bearing 621 of the support block 62 moves up and down.

In addition, since the base 622 can move relative to the elevator platform 6342 within the above-mentioned gap range, when the hub connecting block 61 is connected to the wheel of the automobile, the hub connecting block 61 and the wheel can be moved vertically in a predetermined position. It is possible to move within this range while being buffered by the buffer member 6343.

The configuration of the vehicle restraint device 6 has been described above.
FIGS. 5a, b, and c show how the vehicle to be tested is restrained using the vehicle restraint device 6.
When testing a car, the distance between the front and rear rollers 2 is adjusted according to the wheel base of the car being tested, the roller cover 4 is opened to expose the roller 2, and a predetermined centering device is used. Then, each wheel of the automobile is positioned on each roller 2 so that the longitudinal position of the rotating shaft of the automobile wheel coincides with the longitudinal position of the rotating shaft of the roller 2 for that wheel.

Then, the position of the hub connecting block 61 is adjusted according to the vehicle to be tested so that the fixed part 611 of the hub connecting block 61 is placed in a position where it can be connected to the wheel hub. It is fixed to the wheel hub to restrain the car.

The vertical position of the fixed portion 611 of the hub connecting block 61 is adjusted by raising and lowering the support block 62 using the lifting device 63. Further, the horizontal position of the fixed portion 611 of the hub connecting block 61 can be adjusted by moving the position of the roller cover 4 on which the vehicle restraint device 6 is installed in the horizontal direction, and by moving the adjustment plate 625. The fixing position in the left and right direction to the plate 624 is adjusted by using four elongated holes of the adjustment plate 625.

Here, in each vehicle restraint device 6, the position in the longitudinal direction of the center of rotation of the fixed portion 611 of the hub connecting block 61 matches the position in the longitudinal direction of the center of rotation of the roller 2 for the wheel to which the vehicle restraint device 6 corresponds. Therefore, there is no need to adjust the fixing portion 611 of the hub connecting block 61 in the longitudinal direction.

In addition, when performing a test by driving the chassis dynamometer while restraining the vehicle to be tested using each vehicle restraint device 6, the hub connecting block 61 is supported by the spherical bearing 621 as described above, and , the hub connecting block 61 can move left and right within a predetermined range while being damped by the damper 627, and can also move vertically within a predetermined range while being buffered by the buffer member 6343, so that acceleration/deceleration is The position of each wheel of the vehicle can be maintained at an appropriate position above each roller 2 without significantly interfering with the original movement of the vehicle due to such factors.

Furthermore, according to this chassis dynamometer, the distance in the longitudinal direction between the front wheel roller 2 and the rear wheel roller 2 is variable, and the hub connecting block 61 of the vehicle restraint device 6 can be raised and lowered. Since the system is configured as follows, it is possible to restrain and test various types of cars with different wheel bases and wheel sizes.

Next, the safety fence installed on each roller cover 4 described above will be explained.
FIG. 6 shows a safety fence installed on the front left roller cover 4. A fixed safety fence 701 and an openable safety fence 702 are installed on the roller cover 4.

6a1 and a2 show the top surface and left side surface of the safety fence 702 when it is closed, and FIGS. 6b1 and b2 show the top surface and left side surface when the rear safety fence 702 is rotated and opened.
By providing such an openable/closable safety fence 702, when operating the chassis dynamometer, the safety fence 702 is closed and the vehicle restraint device 6, the wheels and rollers 2 of the automobile are closed, as shown in FIGS. 6a1 and a2. When restraining the vehicle using the vehicle restraint device 6 with the chassis dynamometer stopped while ensuring the safety of workers etc. by shielding the outside of the vehicle, as shown in FIGS. 6b1 and b2. The safety fence 702 can be opened to allow work to be performed without being obstructed by the safety fence 702.

The embodiments of the present invention have been described above.
Here, the buffer member 6343 of the lifting block 634 of the lifting device 63 of the vehicle restraint device 6 shown in the above embodiment may be provided with a load detector 801 as shown in FIG. 7a. By doing so, it is possible to detect the load acting between the vehicle restraint device 6 and the automobile.
In addition, as shown in FIG. 7b, buffer members 6343 provided with load detectors 801 are provided above and below the base 622, and a hydraulic cylinder, an air cylinder, etc., which applies a desired load in the vertical direction to the base 622 can be used. A variable load device 802 is provided on the lifting block 634, and the load can be added or subtracted from the wheels to obtain a desired load while the load detector 801 detects the load acting between the vehicles. .

Here, in the above embodiment, a case has been described in which all four wheels of the automobile are restrained using the vehicle restraint device 6, but the vehicle to be tested has drive wheels such as a front wheel drive vehicle or a rear wheel drive vehicle. If the vehicle is equipped with a driven wheel, only the drive wheel is restrained using a vehicle restraint device 6, and the driven wheel is restrained using a restraint device that restrains the wheel with a belt that goes around the wheel. Good too.
Furthermore, in the above embodiments, the vehicle restraint device 6 may be provided with a moving mechanism that moves the vehicle restraint device 6 itself and the hub connection block 61 in the front-rear direction.
By providing such a moving mechanism, when the chassis dynamometer is not equipped with a centering device for positioning each wheel of the automobile on the roller 2, it is possible to move the rotation axis of the automobile wheel and the rotation axis of the roller 2 back and forth. The hub connecting block 61 is fixed to the wheel hub of the wheel in a state where the position in the direction is slightly deviated to restrain the vehicle, and then the roller 2 is moved back and forth to rotate the rotation axis of the vehicle wheel and the rotation of the roller 2. This makes it possible to match the positions of the shafts in the front and rear directions.

In addition, in the above embodiment, a mechanism using a ball screw is used to raise and lower the elevator table 6342, but the elevator table 6342 can be raised and lowered by a parallel movement mechanism using a feed screw or a spiral shaft, a parallel movement mechanism using a link, etc. This may be done by other mechanisms.

DESCRIPTION OF SYMBOLS 1...Structure, 2...Roller, 3...Opening, 4...Roller cover, 5...Rail, 6...Vehicle restraint device, 61...Hub connection block, 62...Support block, 63...Elevating device, 611...Fixing part, 612... Pivotal support, 613... Connection portion, 621... Spherical bearing, 622... Base, 623... Guide member, 624... Movable plate, 625... Adjustment plate, 626... Linear motion bearing, 627... Damper, 628... Guide through hole , 629...Through hole for supported object, 631...Guide pole, 632...Ball screw shaft, 633...Motor, 634...Elevating block, 701...Safety fence, 702...Opening/closing safety fence, 801...Load detector, 802...Variable Loading device, 6221... Opening, 6241... Tongue part, 6341... Ball screw nut, 6342... Lifting platform, 6343... Buffer member, 63421... Upper part, 63422... Lower part, 63423... Front part.

Claims (7)

A vehicle restraint device for a chassis dynamometer that restrains a vehicle whose wheels are placed on a roller whose top is exposed through an opening provided in a floor plate,
a hub connecting portion including a fixed portion removably connected to a wheel hub of the wheel, and a shaft support rotatably supporting the fixed portion;
a support part that supports the hub connection part;
and a lifting device that lifts and lowers the support part in the vertical direction,
The direction of the rotation axis of the roller is the left-right direction, and the direction perpendicular and horizontal to the rotation axis of the roller is the front-rear direction, and in the vehicle restraint device, the direction of the rotation axis of the fixed part of the hub connecting part is the left-right direction. A vehicle restraint device characterized in that the vehicle restraint device is installed in a position where the position in the longitudinal direction of the rotation axis of the fixed part matches the longitudinal position of the rotation axis of the roller, and the position in the left and right direction is variable. .
The vehicle restraint device according to claim 1,
The vehicle restraint device is characterized in that the support portion supports the hub connection portion movably within a predetermined range in the left-right direction using a damper.
The vehicle restraint device according to claim 1 or 2,
The lifting device has a movable part that moves up and down,
The vehicle restraint device is characterized in that the support part is supported by the movable part so as to be allowed to move within a predetermined range in the vertical direction with respect to the movable part.
The vehicle restraint device according to claim 3,
The vehicle restraint device is characterized in that the elevating device includes a load detection device that detects a load applied from the support portion to the movable portion.
The vehicle restraint device according to claim 3 or 4,
The vehicle restraint device is characterized in that the elevating device includes a loading device that applies a vertical load to the support portion.
The chassis dynamometer comprising the vehicle restraint device according to claim 1, 2, 3, 4 or 5,
It is movable on the floorboard from a position covering the opening to a position outward of the opening that does not cover the opening, with the direction in which wheels are placed on the rollers moving away from the vehicle in the left-right direction as the outward direction. Equipped with a roller cover,
A chassis dynamometer, wherein the vehicle restraint device is installed on the roller cover.
The chassis dynamometer according to claim 6,
A safety fence, at least a part of which is openable and closable, is installed on the roller cover and shields the vehicle restraint device and the wheels placed on the roller from the outside direction. A chassis dynamometer characterized by: