JP4650209B2 - Vehicle pop-out prevention device for chassis dynamometer - Google Patents

Description

  The present invention relates to a vehicle pop-out prevention device that prevents a vehicle under test from jumping out of a chassis dynamometer during a test.

  The vehicle fuel consumption exhaust performance test is usually performed by a device called a chassis dynamometer. The chassis dynamometer is a device that puts a tire on a chassis dynamometer roller, applies a load to the chassis dynamometer roller, and reproduces an actual road load.

  In general chassis dynamometers, in order to prevent the tire of the vehicle under test (hereinafter referred to as the vehicle) from swaying in the front-rear direction or the lateral direction during testing, and the tire dynamometer roller from falling off or jumping out. The wire is placed on the tow hooks at the front and rear of the vehicle (or a part of the vehicle body if there is no tow hook), and this wire is tied to the support installed in the chassis dynamo equipment. The vehicle is fixed on the chassis dynamo roller by applying tension to the wire.

  In addition, a limit switch is arranged as a vehicle behavior detection device near the vehicle body, and when the vehicle body moves in either direction and touches the limit switch, a signal is sent from the limit switch to the chassis dynamo control panel, Measures such as stopping the chassis dynamo roller suddenly are taken.

  As described above, the test is performed in a state where the vehicle body is restrained by a wire, etc., but the impact of acceleration / deceleration or tire puncture causes damage to the wire attachment part or wire, causing the vehicle to turn suddenly to the left or right or the chassis dynamometer Jumping out of the battery may damage the experimental equipment.

  In order to prevent this situation, a chassis dynamometer is generally provided with a vehicle behavior detection device such as a limit switch. However, when the vehicle is traveling at high speed, the behavior of the vehicle is fast, and it is difficult to prevent sudden turning of the vehicle and jumping out of the chassis dynamometer with only the vehicle behavior detection device.

In view of this, there has been proposed a vehicle pop-out preventing device in which a stop roller rotatably supported by a roller support portion is installed in the vehicle pop-out direction on the chassis dynamo roller (see, for example, Patent Document 1). In this vehicle pop-out prevention device, when the wire attachment part or the wire is damaged and the vehicle is about to pop out, the tire comes into contact with the stop roller and rotates the stop roller, thereby absorbing the rotational force of the tire. The vehicle is prevented from popping out.
No. 6-35164

  By the way, in the vehicle pop-out prevention device disclosed in Patent Document 1, the tire and the stop roller are arranged so that the tire does not come into contact with the stop roller when the vehicle is shaken during driving operations such as shift-up, braking, and acceleration / deceleration during a normal test. A clearance of about 10 cm is required between them.

  However, if there is a large clearance between the tire and the stop roller as described above, a large impact load acts on the roller support portion at the moment when the tire hits the stop roller, so the friction of the roller support portion is greatly increased. And the rotation of the stop roller is impeded. As a result, the tire may get over the stop roller and the vehicle may jump out.

  An object of the present invention is to provide a vehicle pop-out prevention device in a chassis dynamometer that can reliably prevent a vehicle from popping out.

  In order to solve the above problems, the present invention provides a vehicle pop-out prevention device for a chassis dynamometer that prevents a vehicle under test from jumping out of a chassis dynamometer body during a test, and is provided along the vehicle width direction of the vehicle under test. A pair of left and right arms is provided, and a small roller is rotatably attached to the end of the arm. When the tire of the vehicle under test moves from a prescribed position of the chassis dynamo roller during the test, the tire is And a mechanical lift-up mechanism that prevents the vehicle under test from popping out by using the force to ride on the vehicle.

  According to the above configuration, the vehicle is lifted up using the force with which the tire of the vehicle rides on the small roller, so that the vehicle can be reliably prevented from jumping out.

  According to the present invention, it is possible to reliably prevent a vehicle from jumping out, and it is possible to perform a test in a chassis dynamometer safely.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of a general chassis dynamometer. In the figure, below a floor surface 1, a pair of front and rear chassis dynamo rollers (hereinafter referred to as rollers) 2 and 3 are rotatably supported by support bases 4 and 5, respectively. The rollers 2 and 3 are connected to a load device (not shown) including a speed increaser, a flywheel, a dynamometer and the like. Front and rear tires 7 and 8 of a vehicle (vehicle under test) 6 are respectively mounted on the rollers 2 and 3. The front and rear tires 7 and 8 drive the rollers 2 and 3, and the rollers 2 and 3 drive the front and rear tires. 7 and 8 can be driven to simulate running conditions.

  Since the vehicle body 9 of the vehicle 6 tends to move either forward or backward due to the driving reaction force of the front and rear tires 7, 8, it is necessary to restrain the vehicle body 6 at a predetermined position. In the present embodiment, as devices for restraining the vehicle body 6, three wires 12A (only one is shown in the figure) connecting the front bumper 10 and the floor surface 1, and the rear bumper 11 and the floor surface 1 are used. Are provided with three wires 12B (only one is shown in the figure). In the figure, reference numeral 13 denotes a hook attached on the floor 1, and one end of each wire 12 is connected.

  A total of six limit switches 14 are arranged as vehicle behavior detection devices on the front left and right, the center left and right, and the rear left and right of the vehicle body 9, and the stylus 14 a is in contact with the vehicle body 9. The limit switch 14 is connected to a chassis dynamometer control panel (hereinafter referred to as a control panel) (not shown), and sends a signal to the control panel when the vehicle body 9 moves in either direction.

  FIG. 2 shows an example in which the vehicle pop-out prevention device 20 according to the present invention is installed in a vehicle 6 under test on a chassis dynamometer. As shown in the figure, the vehicle pop-out prevention device 20 is installed in front of the rear tire 8 under the floor of the vehicle 6. FIG. 2 shows a state when the test is normally performed.

  As shown in FIG. 3, the vehicle pop-out preventing device 20 includes a first arm 22 having a small roller 21 rotatably attached to one side end portion via a bearing and the like, and the other side end of the first arm 22. A second arm 24 that is coupled to the first portion via a coupling portion 23 and is flexible with respect to the first arm 22, and a vehicle support in which the second arm 24 is rotatably attached and can be in close contact with the bottom surface of the vehicle 6. And a third arm 26 rotatably attached to the vehicle support portion 25. In this embodiment, the small roller 21 is formed of rubber, resin, or the like, and the first arm 22, the coupling portion 23, the second arm 24, the vehicle support portion 25, and the third arm 26 are made of metal such as iron. Is formed.

  As shown in FIG. 4, the second arm 24 and the third arm 26 are connected to each other via a ratchet mechanism 27 in the vehicle support portion 25. That is, a support shaft 28 that is rotatably supported by the vehicle support portion 25 is provided on the upper portion of the second arm 24, and a part of the outer surface of the support shaft 28 (on the lower surface side of the outer surface) is provided. A plurality of grooves 29 (ratchet grooves) having a triangular cross-sectional shape are formed in the direction perpendicular to the paper surface. On the other hand, a through hole 30 through which the support shaft 28 penetrates is formed at the upper part of the third arm 26, and a pin 32 urged upward by a coil spring 31 is provided at the lower periphery of the through hole 30. Yes. The pin 32 is engaged with the groove 29.

  The ratchet mechanism 27 rotates the second arm 24 and the third arm 26 in directions toward each other (in FIG. 4, the second arm 24 is clockwise and the third arm 26 is counterclockwise). Although it is permitted to move, the second arm 24 and the third arm 26 are separated from each other (in FIG. 4, the second arm 24 is counterclockwise and the third arm 26 is clockwise). Rotation is prevented. The opening angle between the second arm 24 and the third arm 26 is held at a predetermined angle by the ratchet mechanism 27.

  Although not shown, a ratchet release mechanism that moves the pin 32 downward against the biasing force of the coil spring 31 is provided. By operating this ratchet release mechanism, the second arm 24 and the second arm 24 The opening angle with the three arms 26 can be arbitrarily expanded.

  As shown in FIG. 5, the first arm 22, the second arm 24, and the third arm 26 are arranged on the left and right along the vehicle front-rear direction, and the left and right arms 22, 24 and 26 are integrally coupled. As shown by an arrow A, the coupling portion 23 is provided with a length changing mechanism capable of changing the length in the vehicle width direction of the vehicle under test.

  FIG. 6 shows the a part of FIG. 5 in detail. As shown in the figure, the coupling portion 23 includes a left cylindrical member 33 having a cylindrical shape coupled to the first arm 22 and the second arm 24 on the left side, and the first arm 22 and the second arm on the right side. 24 and a right cylindrical member 34 having a cylindrical shape. A screw member 33 </ b> A is attached to the left end portion of the left cylindrical member 33. Further, a reverse screw member 34A in which a screw in the direction opposite to that of the screw member 33A is engraved is attached to the right end portion of the right cylindrical member 34. For example, if the screw member 33A is a right screw, the reverse screw member 34A is a left screw. A nut 35 is screwed onto the screw member 33A and the reverse screw member 34A, and the screws on the inner surface of the nut 35 are also opposite to each other on the left and right according to the screw member 33A and the reverse screw member 34A.

  If the coupling portion 23 is configured in this way, the interval between the left and right cylindrical members 33 and 34 is expanded and contracted by rotating the nut 35 clockwise or counterclockwise, and the length of the coupling portion 23 is tested. It can be adjusted according to the vehicle width.

  FIG. 7 shows a modification of the coupling portion 23. In this modification, the left end portion of the right cylindrical member 34 is narrowed to form a small diameter portion 34B, and a plurality of screw holes 34C are formed in the small diameter portion 34B at equal intervals. On the other hand, a screw hole (not shown) is also formed in the right end portion of the left cylindrical member 33. Then, the small diameter portion 34B of the right cylindrical member 34 is appropriately inserted into the right end portion of the left cylindrical member 33 in accordance with the vehicle width, and the screw 36 is inserted into the screw hole at the right end portion of the left cylindrical member 33 and the right cylindrical member 34. By screwing into the screw hole 34C of the small diameter portion 34B, the left and right cylindrical members 33, 34 can be firmly connected.

  Next, a support structure for supporting the second arm 24 with respect to the first arm 22 in a flexible manner will be described. Here, only the structure on the left side of the vehicle will be described, but the structure on the right side of the vehicle is also symmetric with respect to the vehicle center axis, and the basic structure is the same as that on the left side of the vehicle.

  As shown in FIGS. 8 and 9, the other end of the first arm 22 (the side opposite to the side where the small roller 21 is provided) is fixed to the left end of the left cylindrical member 33 in the vehicle width direction. .

  Further, a columnar or cylindrical inner member 37 is inserted into the left end of the left cylindrical member 33 in the vehicle width direction, and the inner member 37 is rotatable within the left cylindrical member 33 about its axis. It has become. In addition, a rectangular long hole 33B is formed in the circumferential direction at the left end of the left cylindrical member 33 in the vehicle width direction in accordance with the place where the inner member 37 is inserted.

  Further, one end portion of the second arm 24 (the side opposite to the side on which the ratchet mechanism 27 is provided) is disposed so as to penetrate the elongated hole 33 </ b> B, and its distal end surface is fixed to the side surface of the inner member 37. Yes. Accordingly, the first arm 22 and the second arm 24 are rotatable in the direction of the arrow B and the direction of the arrow C around the left cylindrical member 33, respectively, within the range of the circumferential length of the long hole 33B. It has become.

  FIG. 10 illustrates a manufacturing procedure of the support structure shown in FIGS. That is, an incision is made from the end of the left cylindrical member 33 toward the long hole 33 </ b> B, and a hole 33 </ b> C through which the second arm 24 passes is formed in advance. At this time, the notch piece 33D to be formed is set aside. Thereafter, the inner member 37 to which the second arm 24 is fixed is inserted into the left cylindrical member 33 as indicated by an arrow b, and then inserted through the notch piece 33D into the hole 33C as indicated by an arrow c. Then, the notch piece 33D is fixed to the left cylindrical member 33 by welding or the like.

  Next, the operation of this embodiment will be described.

  When the vehicle running test is performed on the chassis dynamometer, the vehicle pop-out prevention device 20 is installed under the floor of the vehicle 6 and in front of the rear tire 8 as shown in FIG. The opening angle between the second arm 24 and the third arm 26 is set to a wide angle θ, and the vehicle support portion 25 is brought into contact with the bottom surface of the vehicle 6. Further, the first arm 22 is disposed obliquely rearward and upward, and is disposed so that a predetermined clearance is maintained between the small roller 21 at the tip of the first arm 22 and the rear tire 8 of the vehicle 6. . In the state of FIG. 2, the third arm 26 is locked for clockwise rotation (arrow D) by the ratchet mechanism 27, but is free to rotate counterclockwise (arrow E). is there.

  When the running test is normally performed, as shown in FIG. 2, the opening angle between the second arm 24 and the third arm 26 does not change from the set angle θ, and the small roller 21 and the vehicle 6 There is no change in the clearance with the rear tire 8.

  When the rear tire 8 of the vehicle 6 falls off from the upper surface of the roller 3 due to damage of the vehicle restraint device, the rear tire 8 steps on the small roller 21 from obliquely above. When the small roller 21 is stepped on the rear tire 8, the first arm 22 rotates clockwise around the coupling portion 23 as indicated by an arrow F in FIG. 2, and the small roller 21 is the roller 3 or the floor surface. Touch 1 At this time, the vehicle support portion 25 moves rearward of the vehicle 6 along the bottom surface of the vehicle 6, and accordingly, the second arm 24 rotates as indicated by an arrow G around the vehicle support portion 25. .

  Then, as shown in FIG. 11, the second arm 24 is in a substantially upright state to lift the vehicle 6 and the rear tire 8 rides on the small roller 21, so that the rear tire 8 and the roller 3 A certain clearance K is secured between the two. As a result, the rotational force of the rear tire 8 is not transmitted to the roller 3 or the floor surface 1, so that the vehicle 6 can be prevented from jumping out.

  Further, in the state of FIG. 11, the third arm 26 is inclined with the lower part forward, and the lower part is in contact with the floor surface 1, so that the posture of the vehicle pop-out prevention device 20 is stabilized and the vehicle 6 can be more reliably prevented.

  As mentioned above, although the Example of this invention has been explained in full detail with drawing, the said Example is only the illustration of this invention, and this invention is not limited only to the structure of the said Example. Needless to say, changes in design and the like within the scope of the present invention are included in the present invention. For example, the vehicle pop-out prevention device 20 of the present invention may be installed in front of the front tire 7, or may be installed both in front of the front tire 7 and in front of the rear tire 8.

It is a figure which shows an example of a general chassis dynamometer. It is a figure which shows an example which installed the vehicle pop-out prevention apparatus which concerns on this invention in the vehicle under test on a chassis dynamometer. 1 is a schematic side view of a vehicle pop-out preventing device according to the present invention. It is a figure which shows the detail of a ratchet mechanism. It is a top view of the vehicle pop-out prevention device according to the present invention. It is the figure which showed the a section of FIG. 5 in detail. It is a figure which shows the modification of FIG. It is a perspective view of the support structure which supports a 2nd arm flexibly with respect to a 1st arm. It is the perspective view which looked at the support structure of FIG. 8 from the different direction. It is a figure explaining the manufacture procedure of the support structure of FIG.8 and FIG.9. It is a figure which shows a mode when abnormality arises in the vehicle under test on a chassis dynamometer.

Explanation of symbols

2,3 Chassis dynamo roller 6 Vehicle 7 Front tire 8 Rear tire 20 Vehicle pop-out prevention device 21 Small roller 22 First arm 23 Coupling portion 24 Second arm 25 Vehicle support portion 26 Third arm 27 Ratchet mechanism 33 Left cylinder Member 34 Right cylindrical member 33A Screw member 34A Reverse screw member 35 Nut

Claims (5)

A vehicle jump-out preventing device in a chassis dynamometer for preventing a vehicle under test from jumping out from a chassis dynamometer body during a test,
A pair of left and right arms are provided along the vehicle width direction of the vehicle under test, and a small roller is rotatably attached to the end of the arm so that the tire of the vehicle under test is at a prescribed position of the chassis dynamo roller during the test. A chassis dynamometer comprising a mechanical lift-up mechanism that lifts up a vehicle under test using a force that a tire rides on the small roller when moved, and prevents the vehicle under test from jumping out. Vehicle pop-out prevention device. A vehicle jumping prevention device in a chassis dynamometer that prevents the vehicle under test from jumping out of the chassis dynamometer body during testing,
A first arm having a small roller rotatably attached to one end thereof, and a second arm which is coupled to the other end of the first arm via a coupling portion and is bendable with respect to the first arm. An arm of the vehicle, a vehicle support portion that is rotatably attached to the second arm and can be in close contact with the bottom surface of the vehicle under test, and a third arm that is rotatably attached to the vehicle support portion, And the first arm, the second arm, the third arm and the vehicle support part are provided in a pair of left and right along the vehicle width direction of the vehicle under test,
During the test, when the tire of the vehicle under test moves forward from the specified position of the chassis dynamo roller, the vehicle under test is lifted up using the force that the tire rides on the small roller, and the second arm The coupling portion is brought into contact with the chassis dynamometer floor surface, and the third arm is inclined with the lower portion forward, and the lower portion is brought into contact with the chassis dynamometer floor surface to be tested. A vehicle pop-out prevention device for a chassis dynamometer characterized by preventing the vehicle from popping out.   The second arm and the third arm are connected to each other via a ratchet mechanism in the vehicle support portion, and the ratchet mechanism rotates in a direction in which the second arm and the third arm approach each other. The vehicle pop-out preventing device for a chassis dynamometer according to claim 2, wherein the turning is permitted only when the vehicle is turned.   The coupling portion is formed of a cylindrical member that connects the pair of left and right first arms to each other, and the cylindrical member has a length change that changes the length of the cylindrical member according to the vehicle width of the vehicle under test. The vehicle jump-out preventing device for a chassis dynamometer according to claim 2, further comprising a mechanism. The cylindrical member has a left cylindrical member coupled to the left first arm and a right cylindrical member coupled to the right first arm;
The length changing mechanism includes: a screw member provided at a tip of the left cylindrical member; a reverse screw member provided at a tip of the right cylindrical member and engraved with a screw in a direction opposite to the screw member; and the screw 5. The vehicle pop-out prevention device for a chassis dynamometer according to claim 4, further comprising: a member and a nut that is screwed simultaneously with the reverse screw member.

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