JPH11118654A - Chassis dynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and accurately execute a calibration of a torque meter. SOLUTION: A low speed side boss 25 and high speed side boss 27 rotatably supported are provided at both sides of a neutral side gear 31 mounted on an input shaft 22. The shaft 22 is rotatably inserted to the bosses 25, 27. And, toothed parts 25a, 27a are respectively provided on outer peripheries of the bosses 25, 27. A first low speed side gear 29 and first high speed side gear 30 are respectively mounted at the bosses 25, 27. And, the gears 29, 30 and second low speed side gear 39 and high speed side gear 40 engaged with the gears 29, 30 are mounted at an output shaft 37. A slide boss 32 slidably engaged with an outer periphery of the gear 31 is provided. The boss 32 is slid by an air cylinder 33, engaged with the gear 31, engaged with the gear 31 and the boss 25 or engaged with the gear 31 and the boss 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis dynamometer, and more particularly to a gear transmission thereof.

[0002]

2. Description of the Related Art FIG. 3 shows a plan view of a conventional chassis dynamometer. Reference numeral 1 denotes a roller on which a driving wheel of a test vehicle is mounted. The roller is rotatably supported by a bearing 2.
The rotating shaft 1a of the roller 1 is connected to a torque meter 4 via a joint 3.
And the other end of the torque meter 4 is connected to an input shaft 5 a of a gear transmission 5 via a joint 6. The output shaft 5b of the gear transmission 5 is connected to a dynamometer 8 via a joint 7. 9 and 10 are input gears mounted on the input shaft 5a,
Reference numeral 11 denotes an output gear attached to the output shaft 5b;
3 is a transmission gear, and 14 is a lock device for fixing one end of the torque meter 4. The input gears 9, 10 and the transmission gears 12,
13 are engaged.

FIG. 4 is a cross-sectional plan view of a main part of the gear transmission 5, wherein 15 is a bearing for the output shaft 5b, and 16 and 17 are transmission gears 1.
The bosses 2 and 13 are integrated with the transmission gears 12 and 13, respectively, are rotatably supported by bearings 18 and 19, have teeth 16a and 17a on the outer periphery, and have teeth 20a on the inner periphery. With the slide boss 20 having

Next, the operation of the above configuration will be described. When the driving wheel of the test vehicle is mounted on the roller 1 and driven, the roller 1
Rotates, and the input shaft 5a of the gear transmission 5 also rotates via the torque meter 4. Here, when the input vehicle is at a low speed, if the dynamometer 8 is also at a low speed, power absorption is poor. Therefore, in this case, the teeth 20a of the slide boss 20, the teeth 16a of the boss 16, and the output gear 11 mesh with each other as shown in FIG. Thus, the rotation of the input gear 9 is transmitted to the transmission gear 12 at a high speed, and the boss 16 and the slide boss 2 are rotated.
The power is transmitted to the output shaft 5b through the output gear 11 and the output shaft 11, and is transmitted to the dynamometer 8 to absorb the power. On the other hand, if the speed of the dynamometer 8 also increases when the test vehicle is running at a high speed, the dynamometer 8 may be burned. In such a case, the slide boss 20 is slid so that the tooth portion 20a is connected to the output gear 11 and the boss 17.
Mesh with the tooth portion 17a. In this case, the rotation of the input shaft 5a is transmitted from the input gear 10 to the transmission gear 13 at a low speed, transmitted to the output shaft 5b via the boss 17, the slide boss 20, and the output gear 11, and the dynamometer 8 rotates at a low speed. .

[0005]

When the calibration of the torque meter 4 is performed in the chassis dynamometer having the configuration shown in FIG. 3, a calibration arm is attached to the rotating shaft of the torque meter 4, and the calibration arm and the load meter are used. Although the torque is calibrated, in this case, if the gear transmission 5 and the dynamometer 8 are kept connected, the inertia of the gear transmission 5 and the dynamometer 8 are added to the inertia of the roller 1 and accurate calibration is performed. Could not do. For this reason, when the torque meter 4 is calibrated, the joint 6 is detached, and the calibration work requires time and labor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a chassis dynamometer capable of performing accurate calibration of a torque meter without removing a joint.

[0007]

A chassis dynamometer according to the present invention has a neutral gear mounted on an input shaft or an output shaft of a gear transmission, and is rotatably supported on both sides of the neutral gear. A low-speed boss and a high-speed boss having an input shaft or an output shaft rotatably inserted therein and having teeth on the outer periphery, a first low-speed gear and a first low-speed gear attached to the low-speed boss and the high-speed boss, respectively. High-speed gear,
A second low-speed gear and a second high-speed gear that are attached to the output shaft or the input shaft and mesh with the first low-speed gear and the first high-speed gear, respectively; A slide boss slidably meshing with the outer periphery of the neutral gear;
A cylinder mechanism is provided which slides a slide boss and meshes only with the neutral side gear, meshes with the neutral side gear and the low speed side boss, or meshes with the neutral side gear and the high speed side boss.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a cross-sectional plan view and a side view of a gear transmission 21 of a chassis dynamometer according to this embodiment, and an input shaft 22 has one end connected to one end of a torque meter 4 via a joint 6. , And rotatably supported by a frame 24 via two bearings 23. Reference numeral 25 denotes a low-speed boss rotatably supported on the frame 24 via two bearings 26, and reference numeral 27 denotes a high-speed boss rotatably supported on the frame 24 via two bearings 28. Has an input shaft 22 rotatably inserted therein and has teeth 25a, 27a at one end of the outer periphery. Reference numerals 29 and 30 denote first low-speed gears and first high-speed gears mounted on the outer periphery of the bosses 25 and 27, respectively, 31 denotes a neutral gear mounted on the input shaft 22 between the bosses 25 and 27, and 32 Is a slide boss having a tooth portion slidably engaged with the neutral gear 31 on the inner peripheral side, and a ring-shaped guide groove 32a is provided on the outer peripheral side.

Reference numeral 33 denotes an air cylinder having one end rotatably attached to the outside of the frame 24;
The other end of the lever 34 is connected to the piston 33 a of the air cylinder 33. The rotation shaft 35 rises in the frame 24, and a roller 36 is provided at the tip thereof to engage with the guide groove 32a. Reference numeral 37 denotes an output shaft rotatably supported by the frame 24 via three bearings 38, and 39 denotes a second low-speed gear attached to the output shaft 37, which meshes with the first low-speed gear 29. I have. 4
Reference numeral 0 denotes a second high-speed gear attached to the output shaft 37, which meshes with the first high-speed gear 30. The output shaft 37 is connected to the dynamometer 8 via the joint 7. The gear ratio of the low-speed gears 29 and 39 is smaller than the gear ratio of the high-speed gears 30 and 40.

Next, the operation of the above configuration will be described. In the illustrated state, the slide boss 32 is engaged only with the neutral gear 31, and the power transmitted to the input shaft 22 is not transmitted to the output shaft 37, so that a vehicle test cannot be performed. Then, the slide boss 32 is slid by the air cylinder 33. That is, the air cylinder 33 can be set at low, neutral, and high speeds by controlling the delivery / incoming air pressure. For example, when the piston 33a is retracted to the high speed position, the roller 36 is rotated via the lever 34 and the rotating shaft 35. Presses the slide boss 32, and the slide boss 32 meshes with the teeth 27 a of the high-speed boss 27 and the neutral gear 31. When the driving wheel of the test vehicle is mounted on the roller 1 and driven in this state,
The input shaft 22 rotates via the roller 1 and the torque meter 4, the first high-speed gear 30 rotates via the neutral gear 31, the slide boss 32 and the high-speed boss 27, and the second high-speed gear 40 Rotates at a relatively high speed. Therefore, the output shaft 37 also rotates at high speed, and the dynamometer 8 also rotates at high speed to absorb power.

Next, when it is desired to rotate the dynamometer 8 at a relatively low speed, the piston 33a is protruded. As a result, the slide boss 32 is connected to the neutral gear 31 and the low speed boss 25.
Meshes with the tooth portion 25a. When the test vehicle is driven in this state, the input shaft 22 rotates, and the first low-speed gear 2 passes through the neutral gear 31, the slide boss 32, and the low-speed gear 25.
9 rotates, and the second low-speed gear 39 rotates at a relatively low speed. Therefore, the output shaft 37 rotates at a low speed, and the dynamometer 8 also rotates at a low speed to absorb power.

Next, when the calibration of the torque meter 4 is performed, the piston 33a of the air cylinder 33 is slightly retracted to the neutral position. As a result, the slide boss 32 is in the position shown in the figure, and is engaged only with the neutral side gear 31, so that only the input shaft 22 is connected to the torque meter 4, which is almost the same state as when the joint 6 is removed. , The high-precision calibration of the torque meter 4 can be performed. or,
Only the two-stage stroke of the air cylinder 33 is required as compared with the conventional structure, and the cost is reduced.

In the above embodiment, switching between high speed, neutral, and low speed is performed on the input shaft 22 side.
The same effect can be obtained even if it is performed on the side.

[0014]

As described above, according to the present invention, when the torque meter is calibrated, the slide boss is slid by the cylinder mechanism so as to mesh only with the neutral side gear. Since the meter is almost disconnected and is not affected by its inertia, the calibration of the torque meter can be performed easily and with high accuracy. Moreover,
If the cylinder mechanism has a two-stage stroke in the conventional structure, it is almost achieved and the cost is low.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a gear transmission of a chassis dynamometer according to the present invention.

FIG. 2 is a side view of the gear transmission of the chassis dynamometer according to the present invention.

FIG. 3 is a plan view of a conventional chassis dynamometer.

FIG. 4 is a cross-sectional plan view of a main part of a conventional gear transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Roller 4 ... Torque meter 8 ... Dynamometer 21 ... Gear transmission 22 ... Input shaft 25 ... Low speed side boss 27 ... High speed side boss 29 ... First low speed side gear 30 ... First high speed side gear 31 ... Neutral side Gear 32 Slide boss 33 Air cylinder 34 Lever 35 Rotating shaft 37 Output shaft 39 Second low-speed gear 40 Second high-speed gear

Claims (1)

[Claims] 1. A gear having a roller rotatably supported on which a driving wheel of a test vehicle is mounted, a rotatable input shaft and an output shaft, and the input shaft connected to the roller via a torque meter. In a chassis dynamometer provided with a transmission and a dynamometer connected to an output shaft of a gear transmission, a neutral gear attached to an input shaft or an output shaft, and rotatably supported on both sides of the neutral gear. A low-speed side boss and a high-speed side boss through which an input shaft or an output shaft is rotatably inserted and which has teeth on the outer periphery, a first low-speed side gear and a second A first high-speed gear, a second low-speed gear and a second high-speed gear attached to the output shaft or the input shaft and meshing with the first low-speed gear and the first high-speed gear, respectively; With a toothed portion, A slide boss that slidably meshes with the outer periphery, and a cylinder mechanism that slides the slide boss and meshes only with the neutral gear, or meshes with the neutral gear and the low-speed boss, or meshes with the neutral gear and the high-speed boss. A chassis dynamometer comprising: