JPH044195Y2 - - Google Patents

Description

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

<Technical Background and Issues> CHDY is widely used for testing exhaust gas characteristics and fuel consumption characteristics because it allows experiments that are 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, propulsive force is generated and the vehicle body tries to move back and forth, so the wire rope 7 stretches and waves, and the vehicle body vibrates back and forth, causing the wire rope to move forward and backward as shown in Figure 2. 7 is pulling the car body downward, so the vertical component of the pulling force makes it appear as if the weight of the car has increased, which causes an error in the measured value of power absorption, 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 aims to solve the above-mentioned drawbacks of the prior art by fixing the wheel hub of the wheel instead of fixing the vehicle body with a wire rope, and to provide a vehicle restraint device that can accurately simulate CHDY. purpose.

<Means for solving the problem> The vehicle restraint device of 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 fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer. a rotary rocking device that supports the rotary rocking device so as to be rotatable and swingable in any direction; and a link mechanism that is attached to a base and supports the rotary rocking device so that the rotary rocking device is immovable in the front-rear direction and movable in the vertical and horizontal directions. It is characterized by having the following.

<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, and the rotation and oscillation device allows the rotation of the mounting shaft and also allows arbitrary movement. Swings in the directions are allowed. 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, when the wheel hub of the wheel is fixed to the mounting shaft, movement in the front and rear direction is restricted.
Movements such as wheel rotation, vertical movement, and turning, as well as pitching and rolling of the vehicle body, behave in the same way as when actually driving on the road.

<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, the vehicle restraint device 17 of the present invention has a base 1 as shown in FIGS. 5 to 7.
8, a link mechanism consisting of left and right links 19, up and down links 20, a rotational swing device 21, and the like. The base 18 is fixed to a frame 22 provided in the front-rear direction that supports the pit cover 10, supports the left and right links 19 so as to be rotatable about a horizontal axis in the front-rear direction, and also allows for position adjustment in the front-rear direction. It has a built-in offset device 23 that performs this.
The vertical link 19 is a vertical frame 19 as shown in FIG.
c. It is constructed into a rectangular frame consisting of a lower frame 19d and an upper frame 19e, and is connected to the base 18 via a bearing so that it can rotate around the lower frame 19d. Between the diagonals of the left and right links 19,
Reinforcement material 19a, 1 for increasing rigidity in the front and rear direction
9b is attached. As shown in FIG. 7, in the offset device 23, a piston 24, which is attached to the protruding portion of the lower frame 19d of the left and right links 19 via a bearing, is slidably fitted into a cylinder 25 and penetrates through the cylinder 25. The tip of a hexagonal bolt 26 is fixed to the piston 24. Therefore, by rotating the head of the hexagonal bolt 26 with a wrench, the left and right links 19,
The vertical link 20 and the attachment mechanism section 21 can be moved back and forth depending on the wheel base of the vehicle 15. The upper and lower links 20 are framed in an isosceles triangle as shown in FIG. It is designed to be able to rotate around its axis. As a result of the left and right links 19 and the upper and lower links 20 being rotatably connected around an axis horizontal to the front and back directions, the mounting mechanism 21 supported at the top of the upper and lower links 20 cannot be moved in the front and back direction and can be moved up and down. It can be made movable in both directions and left and right directions.

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 vertical link 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
Even if the vehicle 15 causes pitching or rolling when performing various tests by rotating 1a to 12b, the left and right links 19, the vertical links 20, and the mounting mechanism 21 operate, and the vehicle is restrained in the longitudinal direction. Other than that, it behaves just like it would on a real road.

Further, since the vehicle restraint device 17 of the present invention can adjust the position of the vehicle in the longitudinal direction by the offset device 23, it can be adjusted according to the wheel base even when the wheel base is different.
Since the rotary swinging device 21 is supported by a link mechanism consisting of the upper and lower 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. Furthermore, in the mounting mechanism section 21,
Since the contact surface of the flange portion 27a with the wheel 29 is large, it is advantageous in terms of strength, and since the bolt nut 33 is used, the flange portion 27a is attached to the wheel 29.
It can be easily aligned and installed, and the tightening condition can be directly observed, making inspection easy.
Note that if the shapes of the wheel 29, hub bolt 32, etc. differ depending on the vehicle model, the shape of the flange portion 27a may be arbitrarily changed in design accordingly.

Embodiment 2 A second embodiment of the present invention is shown in FIG. This embodiment is designed to measure tire air pressure or change tire air pressure depending on the purpose of the test, and has the same configuration as the embodiment shown in Figs. 5 to 7 except for the mounting mechanism. It is. That is, as shown in FIG. 9, the rotary swing 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. It is something to do. A flange portion 27'a is formed at the left end of the mounting shaft 27' in the figure, and this flange portion 27'a is connected to the wheel hub 30' together with the wheel 29' by the hub bolt 32' and the nut 3.
They are fastened together at 4'. Two deep groove ball bearings 28' are fitted on the outer periphery of the mounting shaft 27', and a spherical bearing 36' is further fitted on the outer periphery thereof. The outer ring of the spherical bearing 36' is fixed to the top of the upper and lower links 20'. A cover 37 that covers the rear part of the mounting shaft 27' is attached to the inner ring of the spherical bearing 36'. A ventilation hole 38 for controlling air pressure is formed in the mounting shaft 27', passing through the center from the rear end surface to the upper side surface in the figure, and a tire tube (not shown) is inserted into the side opening of this ventilation hole 38. A ventilation pipe 39 is connected thereto. Mounting shaft 27
A rotary joint 40 is airtightly interposed between the rear end and the end of the cover 37, and a ventilation pipe 41 connected to a compressed air source and a pressure measuring device (both not shown) is connected to the end of the cover 37. is connected to. Therefore, the pressure measuring device communicates with the tube of the tire through the ventilation pipe 41, the ventilation hole 38 of the mounting shaft 27', and the ventilation pipe 39, and can measure the tire air pressure even while the wheel is rotating. It is also possible to control the tire pressure by supplying compressed air from a compressed air source to the tire tube through the vent 38 and to measure how the tire pressure affects fuel efficiency. Furthermore, since the rotary joint 40 is provided, air will not leak from between the cover 37 and the mounting shaft 27'. In addition, the deep groove ball bearing 28' and the spherical bearing 3
6' has the same effect as the above-mentioned embodiment,
The wheels are not restrained at all other than in the front-rear direction and can rotate freely and swing arbitrarily. Further, in the figure, 42 is a two-pole slip ring for measuring tire temperature. In addition, in the first and second embodiments described above, the spherical bearings 36, 3 are used as spherical joints.
6' was used, but the present invention is not limited to this, and it is also possible to use a spherical pair that can be rotated in any direction.

<Effects of the invention> As explained above in detail based on the embodiments, the vehicle restraint device of the invention has a flange fixed to the wheel hub of a wheel mounted on a load device of a chassis dynamometer. a mounting shaft, a rotating swing device that supports the mounting shaft so that it can rotate freely and swing in any direction; Unlike conventional systems that use wire ropes to restrain the vehicle body, this system has a link mechanism that supports the vehicle body in a movable manner, so there is no torque error, making it possible to perform highly accurate tests that are similar to actual road driving. Tests can be conducted. In addition, since the design of the wheel hub does not change depending on the type of vehicle, it can be fixed using a common mounting shaft, resulting in various excellent effects such as versatility.

[Brief explanation of the drawing]

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
The figure is an enlarged sectional view of a mounting mechanism according to a second embodiment of the present invention. In the drawings, 11a, 11b, 12a, 12b are rollers, 15 is a four-wheel drive vehicle, 16 is a wheel, 17 is a vehicle restraint device, 19 is a left and right link, 20 is a vertical link, 21, 21' is a rotating swing device, 27, 27' are mounting shafts, 27a, 27'a are flange parts, 28,
28' is a ball bearing, and 36, 36' are spherical bearings.

Claims (1)

[Scope of utility model registration request] a mounting shaft having a flange that is 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 vehicle restraint device comprising: a link mechanism that is attached to a base and supports the rotary swing device so as to be immovable in the front-back direction and movable in the up-down direction and the left-right direction.