JPH044196Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is applied to a palm dynamometer (hereinafter referred to as
This device relates to a vehicle restraint device that allows vertical and horizontal movement of a vehicle (abbreviated as CHDY) and restrains it in the front and rear directions.

<Conventional technology> CHDY is widely used for testing exhaust gas characteristics and fuel consumption characteristics because it allows experiments equivalent to actual driving on the road to be easily conducted indoors with good reproducibility. Recently, it has also been used for research and experiments on maneuverability and stability during high-speed driving.
However, there are many test items including the setting of absorption power, and if even one of these is inappropriate,
CHDY simulation becomes unsatisfactory. Therefore, in order to improve reproducibility, four
CHDY has been developed not only for wheel drive vehicles but also for front wheel drive or rear wheel drive vehicles, in which all four wheels are placed on a load device and rotated. Conventionally, a wire rope 7 as shown in FIGS. 1 and 2 has been used to restrain a vehicle on such a CHDY in the longitudinal direction. That is, as shown in the figure, two sets of front and rear rollers 1 and 2 are rotatably supported via bearings under the floor surface.
An absorption device (both not shown) is connected to the speed increaser and a flywheel to form a load device. Front and rear wheels 6 of a vehicle 5 are placed on the upper surfaces of the rollers 1 and 2 exposed on the floor surface, and when the wheels 6 are driven and rotated, the rollers 1 and 2 are rotated accordingly. A plurality of wire ropes 7 are stretched across the floor from the front and rear ends of the vehicle 5, and the vehicle 5 is positioned and fixed in the longitudinal direction. Further, the wire ropes 7 stretched across are crossed in the left and right directions so that the vehicle 5 does not move not only in the front and rear directions but also in the left and right directions.

<Problems to be Solved by the Invention> Although such a fixing method using the wire rope 7 is easy to handle, it has the following drawbacks.

(b) During acceleration and deceleration, a propulsive force is generated and the vehicle body tries to move back and forth, so the wire rope 7 expands and contracts and causes waves, and as a result of the vehicle body vibrating back and forth, the wire rope 7 as shown in Figure 2 7 is pulling the vehicle body downward, so the vertical component of the tensile force makes it appear as if the weight of the vehicle has increased, causing an error in the measured value of power absorption and making accurate power measurement impossible.

(b) If the vehicle body vibrates or a load is applied due to the above reasons, the suspension or tires may become deformed or other inconveniences. The present invention solves the drawbacks of the above-mentioned conventional technology, with a mounting mechanism fixed to the wheel hub so as to be rotatable and swingable in any direction.
The purpose of this invention is to provide a vehicle restraint system that can accurately simulate CHDY.

<Means for Solving the Problems> The present invention includes a mounting shaft having a flange fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer, and a mounting shaft that is rotatable and a rotary rocking device that supports the rotary rocking device so as to be swingable in any direction; a link mechanism that is attached to a base and supports the rotary rocking device so as to be movable in the horizontal and vertical directions; The present invention is characterized by comprising an offset device for adjusting the position in the longitudinal direction of the vehicle.

<Function> The link mechanism allows the rotation and oscillation device to move in the vertical and horizontal directions, but restricts its movement in the front and rear directions. Allows for directional fluctuation. Furthermore, the mounting shaft has a flange that is fixed to the wheel hub of the wheel.

Therefore, when a vehicle is mounted on a load device of a chassis dynamometer, fixing the wheel hub of the wheel to the mounting shaft restricts the forward and backward movement of the wheel, and the rotation, vertical movement, and turning movement of the wheel are restricted. etc., and movements such as pitching and rolling of the vehicle body behave in the same way as when actually driving on the road.

Further, by moving the link mechanism in the longitudinal direction of the vehicle using an offset device to correspond to the length of the wheel base of the vehicle, the present invention can be easily applied to vehicles with different wheel bases.

<Examples> The present invention will be described in detail below based on examples.

Example 1 This example is shown in FIGS. 3 to 8. As shown in Figures 3 and 4, the pit cover 1 which is the floor surface
0, there are rollers 11a, 11b on the front, back, left and right.
12a, 12b are arranged rotatably, and the front rollers 12a, 12b are immovable in the front-rear direction, while the rear rollers 11a, 11b
is slidably mounted on the slide rail 9 so that it can be moved in the front and rear directions. That is, a slider 8 supporting rear rollers 11a and 11b is placed on a slide rail 9 so as to be slidable back and forth, and a screw shaft 1 is screwed through the slider 8.
3 is rotatably supported and connected to a motor 14. Therefore, when the screw shaft 13 is rotated by the motor 14, the slider 8 and the rollers 11a, 11b, which are screwed thereto, spiral forward and backward. roller 11
A, 11b, 12a, 12b are connected to an absorption device (all not shown) via a speed increaser and a flywheel to constitute a load device, and the rollers 11a, 11b, 12 exposed from the pit cover 10
The wheels 6 of the four-wheel drive vehicle 15 are on the upper side of a and 12b,
16 is placed. Therefore, when the wheels 6, 16 are driven and rotated, the rollers 11a, 11
b, 12a, and 12b rotate, but the CHDY to which the present invention can be applied is not limited to this type. For example, in the case of CHDY, which tests rear-wheel drive vehicles, the front and rear rollers 11a, 1
A load device may be used in which the rollers 1b, 12a, 12b are rotated synchronously by uniform speed gears or the like so that they share a flywheel, and the rollers 11a, 1
Instead of 1b, 12a, 12b, a steel belt or the like may be rotatably stretched, and the load device may be configured such that the wheels 6, 16 can be placed on this steel belt or the like.

As shown in FIGS. 3 and 4, the vehicle restraint device 17 of the present invention is constructed on both left and right sides of the rear wheels 16 of the four-wheel drive vehicle 15 in order to restrain the rear wheels 16. That is, as shown in FIGS. 5 to 7, the vehicle restraint device 17 of the present invention is comprised of a link mechanism including a base 18, left and right links 19, and up and down links 20, a rotational swing device 21, and the like. Base 1
8 is a four-wheel drive vehicle 15 that supports the pit cover 10;
It is fixed to a frame 22 provided in the longitudinal direction of the four-wheel drive vehicle 15, and the left and right links 19 are rotatably supported around an axis horizontal to the longitudinal direction of the four-wheel drive vehicle 15.
Moreover, it has a built-in offset device 23 for adjusting the position in the front-rear direction. As shown in FIG. 7, the left and right links 19 are framed in a rectangular shape consisting of a vertical frame 19c, a lower frame 19d, and an upper frame 19e.
It is connected to the base 18 via a bearing so that it can rotate about the lower frame 19d. Reinforcing members 19a and 19b are attached between diagonal corners of the left and right links 19 to increase rigidity in the front and rear direction. As shown in FIG. 7, the offset device 23 has a piston 24 mounted on a protruding portion of the lower frame 19d of the left and right links 19 via a bearing, which is attached to the cylinder 2.
The tip of a hexagonal bolt 26 that is slidably fitted into the piston 5 and passes through the cylinder 25 is fixed to the piston 24. Therefore, by rotating the head of the hexagonal bolt 26 with a spanner, the left and right links 19, the upper and lower links 20, and the mounting mechanism 21 can be manually moved back and forth depending on the wheel base of the vehicle 15. As shown in FIG. 5, the upper and lower links 20 are framed in an isosceles triangle, and bearings 20a,
It is connected to the upper frame 19e of the left and right links 19 by 20b, and can rotate around an axis horizontal to the front and rear directions. As a result of the left and right links 19 and the top and bottom links 20 being rotatably connected around an axis horizontal in the front and back direction, the top and bottom links 20
The attachment mechanism section 21 supported on the top of the can be made immovable in the front-rear direction and freely movable in the up-down direction and the left-right direction.

As shown in FIG. 8, the rotating and swinging device 21 supports a mounting shaft 27 having a flange portion 27a fixed to the wheel hub 30 so as to be rotatable and swingable in any direction. That is, in the wheel 16, the brake drum 3 is connected to the wheel hub 30.
1. Wheel 29 is installed and hub bolt 3
A bolt nut 33 is tightened at 2. On the other hand, the left end of the mounting shaft 27 in the figure has a flange portion 27a.
is formed, and this flange portion 27a is attached to the wheel 2.
9, and is fixed to the wheel hub 30 by being tightened by a bolt nut 33 passing through the wheel hub 34 with a nut 34. Mounting shaft 2
A boss 35 is fixed to the outer periphery of the boss 3.
Two ball bearings 28 are fitted on the outer periphery of 5, and a spherical bearing 36 is further fitted on the outer periphery. The outer ring of the spherical bearing 36 is fixed to the top of the left and right links 20. As a result, the wheels 16 are not restricted at all except for movement in the front and back direction, and can freely rotate and swing in any direction. Therefore, by driving and rotating the wheels 16, the rollers 1
When rotating 1a to 12b and performing various tests,
Even if pitching or rolling occurs due to sudden acceleration, sudden deceleration, or partial braking of the vehicle 15, the link mechanism consisting of the left and right links 19 and the up and down links 20 and the rotational swing device 21 operate, and the vehicle continues to move. Other than being restrained in the front and back direction,
It behaves just like it would in real life on the road.

Furthermore, the offset device 23 allows the vehicle restraint device 17 of the present invention to adjust the position in the longitudinal direction of the vehicle, so even if the wheel base is different, it can be adjusted according to the wheel base.
Since the attachment mechanism section 21 is supported by the link mechanism consisting of the left and right links 20 so as to be able to move up and down, it is also excellent in versatility, as it can be used even when wheels have different diameters. In addition, since the contact surface of the flange portion 27a with the wheel 29 in the mounting mechanism portion 21 is large, it is advantageous in terms of strength, and the bolt/nut 33
Since the flange portion 27 is used, the flange portion 27 can be easily aligned and attached to the wheel 29, and the tightening condition can be directly observed, making inspection easy. still,
If the shape of the wheel 29, hub bolt 32, etc. differs depending on the vehicle model, the flange portion 2 may be adjusted accordingly.
The shape of 7a may be arbitrarily changed in design.

Embodiment 2 A second embodiment of the present invention is shown in FIGS. 9 to 12. As shown in FIG. 10, a wheel 38 is placed on the roller 37, and when the wheel 38 is driven and rotated, the roller 37 is rotated accordingly. As in the above embodiment, the roller 37 is connected to an absorption device (both not shown) via a speed increaser and a flywheel to constitute a load device. On the sides of the rollers 37 and wheels 38, a vehicle restraint device 42 is arranged, which includes a link mechanism including a base 43, left and right links 39, and upper and lower links 40, a rotation swing device 41, and the like. Base 43
is fixed to the support member 66, and supports the left and right links 39 via linear motion bearings 44 so as to be rotatable about a horizontal axis in the front-rear direction and slidable in the front-rear direction. The left and right links 39 are the first
As shown in Figure 1, it is framed in a rectangle,
Projections 39c on the left and right sides of the lower side are connected to the base 43 via linear motion bearings 44, respectively. On the diagonal of the upper and lower links 39, reinforcing materials 39a and 39 are provided to increase the rigidity in the front and rear direction.
b is attached. An offset device 45 is interposed between the protruding portion 39c of the upper and lower links 39 and the base 38 for adjusting the position in the front and rear direction. That is, a hollow shaft 47 is connected to the protrusion 39c via a bearing 46, and a feed screw shaft 48 is inserted into the hollow shaft 47 from its tip. The tip of the feed screw shaft 48 is connected via a bearing 49,
It is rotatably and slidably supported by a hollow shaft 47, and its rear end is supported by a support member 66 via a bearing 50 and a frame 51. A nut 67 that is screwed onto the feed screw shaft 48 is fixed to the tip of the hollow shaft 47, and a detent 68 protruding from the nut 67 is slidable in the front-rear direction on a guide rail 69 arranged in the front-rear direction. and is fitted in such a way that it cannot rotate. A gear 70 is further fixed to the feed screw shaft 48, and this gear 70 meshes with a pinion 72 of a motor 71. Therefore, when the motor 71 is started and the feed screw shaft 48 is rotated through the pinion 72 and the gear 70, the nut 67 that is screwed together with the feed screw shaft 48, the hollow shaft 47, and the left and right links that are connected to this through the bearing 46 are connected. 39, the vertical link 40 and the attachment mechanism part 41 move back and forth, and their positions in the front and back direction can be adjusted according to the wheel base of the vehicle. The upper and lower links 40 are framed in an isosceles triangle as shown in FIG.
It is connected to the upper side of the left and right link 39 by bearings 40a and 40b provided on both sides of its bottom side, and is rotatable around an axis horizontal to the front and back direction.
As a result of the left and right links 39 and the vertical links 40 being rotatably connected around an axis horizontal in the front-rear direction, the rotary swing device 41 supported at the top of the vertical link 40 cannot be moved in the front-rear direction. It can be moved vertically and horizontally.

As shown in FIG. 12, the rotary rocking device 41 has a mounting shaft 52 having a flange portion 52a fixed to a wheel hub 56 of a wheel 38, and a self-aligning ball bearing 5.
3. It is supported so as to be rotatable and swingable in any direction via a swing shaft 54 or the like. That is, the brake drum 57 and the wheel 5 are connected to the wheel hub 56.
8 and a flange portion 52a formed at the left end in the figure of the mounting shaft 52 are fastened together with a hub bolt 58 and a nut 59. A self-aligning ball bearing 53 is fitted onto the outer periphery of the mounting shaft 52, and this self-aligning ball bearing 53 is clamped by a swing shaft 54 from the front and rear directions (vertical direction in the figure). Each swing axis 54
is supported by the left and right links 40 via ball bearings 55 so as to be rotatable around an axis horizontal in the front-rear direction. As a result, the wheels 38 are not restrained at all except for their movement in the front-back direction, and can freely rotate and swing in any direction.

Further, the tire air pressure can be measured through the mounting portion 41, or the tire air pressure can be changed depending on the purpose of the test. That is, the mounting shaft 5
2 is provided with a vent hole 60 for controlling air pressure which passes through the center from the rear end surface to the upper side surface in the figure, and the rear part of the mounting shaft 52 is covered by a cover 61. A rotary joint 62 is airtightly interposed between the cover 61 and the rear end of the mounting shaft 52, and a ventilation pipe 63 connected to a compressed air source and a pressure measuring device (both not shown) is connected to the cover 6.
It is connected to the end of 1. On the other hand, a ventilation pipe 64 connected to a tire tube (not shown) is connected to a side opening of the ventilation hole 60. Therefore, the pressure measuring device includes the vent pipe 63, the vent hole 60 and the vent pipe 64.
The air pressure in the tire can be measured even while the wheel 38 is rotating. Also, from the compressed air source to the vent 60
It is also possible to control tire air pressure by supplying compressed air to the tire tube through a device such as a tire tube, and measure how tire air pressure affects fuel efficiency. In this case, since the rotary joint 62 is interposed, air will not leak from between the cover 61 and the mounting shaft 52. In addition, in the figure, 6
5 is a two-pole slip ring for tire temperature measurement. In this embodiment, a self-aligning ball bearing 53 is used in place of the ball bearing 28 and the spherical bearing 36 in the first embodiment, which is advantageous in terms of cost, but the present invention is limited thereto. Rather than a fixed type, those with a mounting shaft that is rotatable and swingable in any direction are widely used.

Example 3 A third example of the present invention is shown in FIG. The embodiment shown in the figure is provided with a fluid pressure cylinder 165 as an offset device in place of the feed screw shaft 48 and the like in the second embodiment, and the other configurations are the same as the second embodiment. That is, the lower side protrusion of the vertical link 39 framed in a rectangular shape is connected to the base 43 via a linear motion bearing 44, and the vertical link 39 is rotatable around the lower side and freely movable in the front and rear direction. It is becoming. The lower protrusion of the upper and lower links 39 is further connected to the coupling 1
A fluid pressure cylinder 165 is connected via 66. Therefore, when fluid such as pressure oil is supplied to and discharged from the fluid pressure cylinder 165, the upper and lower links 39 and the left and right links 4
0 and the mounting portion 41 move in the front-rear direction, and the positions in the front-rear direction can be adjusted according to the wheel base of the vehicle.

<Effects of the invention> As described above in detail based on the embodiments, the vehicle restraint device of the invention has a flange fixed to the wheel hub of the wheel mounted on the load device of the chassis dynamometer. A mounting shaft, a rotary swinging device that supports the mounting shaft so as to be rotatable and swingable in any direction, and a rotary swinging device that is attached to a base and supports the rotating and swinging device so as to be movable in the horizontal and vertical directions. Because it is equipped with a link mechanism, rolling and pitching of the vehicle is allowed on CHDY, making it possible to conduct tests that are almost the same as actual road driving with good reproducibility. Furthermore, since the link mechanism is provided with a position adjustment device in the longitudinal direction of the vehicle with respect to the base, there is an advantage that it can be easily applied to vehicles with different wheel bases.

[Brief explanation of drawings]

Figure 1 is a plan view for explaining the conventional vehicle body fixing method, Figure 2 is its schematic structural diagram, and Figures 3 to 8.
The figures relate to the first embodiment of the present invention;
The figure shows a plan view and side sectional view of CHDY in which the vehicle restraint device of the present invention is installed, and FIGS. 5, 6, and 7 show a partially sectional plan view and side view of the vehicle restraint device,
Front view, Figure 8 is an enlarged sectional view of the mounting mechanism, Figure 9
Figures 9 to 12 relate to the second embodiment of the present invention, and Figures 9, 10, and 11 are a plan view, side view, and front view showing a vehicle restraint device partially in section, and Figure 12 is a partial cross-sectional plan view of the vehicle restraint device. 13 is an enlarged sectional view of the attachment mechanism, and FIG. 13 is a partially sectional front view of a vehicle restraint device according to a third embodiment of the present invention. In the drawings, 11a, 11b, 12a, 12b, 3
7 is a roller, 15 is a four-wheel drive vehicle, 16, 38 are wheels, 19, 39 are left and right links, 20, 40 are up and down links, 21, 41 are rotary swing devices, 27, 52
is a mounting shaft, 27a, 52a are flange parts, 28 is a ball bearing, 36 is a spherical bearing, 23, 45, 65 is an offset device, 53 is a self-aligning ball bearing, 30, 5
6 is a wheel hub, and 29 and 58 are wheels.

Claims (1)

[Scope of utility model registration request] a mounting shaft having a flange fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer; and a rotating swing device that supports the mounting shaft so as to be rotatable and swingable in any direction. , a link mechanism that is attached to a base and supports the rotary swing device so as to be movable in the horizontal and vertical directions; and an offset device that adjusts the position of the link mechanism in the longitudinal direction of the vehicle with respect to the base. A vehicle restraint device characterized by being equipped with.