JPH04216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test device suitable for use in performing friction and wear tests on synchronizers used in automobile transmissions.

The synchronizer is installed between the slider connected to the input shaft and the synchronizer cone connected to the output shaft, and has the function of quickly matching the rotational speeds of these two and meshing them. In the initial state of operation, the slider Because of the relationship between frictional engagement and frictional engagement, it is desirable that the friction coefficient be large and the wear resistance be excellent.

For this reason, synchronizers made of various materials or of various shapes have been developed to satisfy the above requirements, but these newly developed synchronizers are subjected to friction and wear tests when they are prototyped.

Conventionally, in performing the above-mentioned friction and wear test, an apparatus as described below has been used. That is,
The test device includes a cone gear rotated by a rotational drive source and a workpiece mounting jig disposed on the same axis as the rotation axis of the cone gear. The workpiece attached to the workpiece mounting jig, that is, the synchronizer, is attached to the cone gear that has been
The cone gear is moved and pressed by a gravity-type moving mechanism using a weight, and the frictional force generated between the cone gear and the synchronizer and the amount of wear on the synchronizer are measured.

However, in the case of a friction and wear testing device equipped with the above-mentioned gravity-type movement mechanism, the pressing force of the work against the cone gear temporarily increases at the moment the work comes into contact with the cone gear, as shown in Figure 1. Therefore, there was a problem that it was difficult to set the workpiece pressing force, and furthermore, it was difficult to measure with high precision.

The present invention has been made in view of the above circumstances, and allows the workpiece to be pressed against the pressed member with a constant thrust, making it easy to set the workpiece pressing force, and enabling highly accurate friction and wear testing. The purpose is to provide a test device that can perform

In order to achieve such an object, the present invention includes a pressed member that is rotated by a drive source and on which a work is pressed, and a pressed member that is arranged on the same axis as the rotation axis of the pressed member and that A friction and wear testing apparatus comprising a workpiece mounting jig that is moved in a direction by a moving mechanism, an air cylinder that urges at least one of the pressed member or the workpiece mounting jig toward the other; The structure includes a load cell that detects the pressing force between the pressed member and the workpiece, and a pressure control valve that controls the air pressure of the air cylinder to a predetermined value based on the detection result of the load cell.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is an overall plan view of the friction and wear testing device, and FIG. 3 is a side view thereof. In the figure, reference numeral 1 denotes a frame, and a variable speed motor 2 is disposed at the lower left end of the frame 1 in the figure.
The output shaft of this motor 2 is connected to a shaft 6 via a pulley 3, a belt 4, and a pulley 5 that are integrally attached to the output shaft. The shaft 6 is rotatably supported by pillow blocks 7, 7, and is connected to a tachometer 11 via a pulley 8, a belt 9, and a pulley 10, so that the rotational speed can be detected. Further, a torque converter 13 is connected to the shaft 6 via a joint 12.
Further, a shaft 15 is connected to the torque converter 13 via a joint 14. The right end side of the shaft 15 in the figure is inserted into the box 16 via a seal member 16a, and a cone gear (pressed member) 17 is attached to the end of the shaft 15, with which the workpiece W is pressed with a predetermined pressing force.
are integrally attached. Box 1
Lubricating oil O is injected into the cone gear 6 to bring the cone gear 17 and the workpiece W into smooth contact and to dissipate the frictional heat generated between them. Further, a cooling device 18 for suppressing the temperature rise of the lubricating oil O is disposed within the box 16. In addition,
In the figure, reference numeral 19 indicates a flow meter that constitutes the cooling device 18, and reference numeral 20 indicates a solenoid valve, and the cooling device 18 performs a cooling function using water.

On the other hand, in the box 16, a workpiece mounting jig 21 is disposed on the same axis as the rotational axis of the cone gear 17 so as to face the cone gear 17. Further, the shaft 22 supporting the workpiece mounting jig 21 is slidable in the left and right directions in the figure, and is connected to the box 1 through a seal member 16b.
6 Projected to the outside. A displacement gauge 23 for detecting the amount of movement of the coaxial shaft 22 in the horizontal direction in the figure is attached to the part that projects outside the box 16, and a displacement gauge 23 for detecting the load in the thrust direction applied to the coaxial shaft 22 is attached to the right end of the displacement gauge 23. Load cell 24
is installed. Furthermore, the load cell 24
A protruding end portion of a piston rod 26 of an air cylinder 25, which is arranged on the same axis as the shaft 22 and the load cell 24, is connected to the right end portion of the piston rod 26.

A movable base 28 is disposed at the right end of the frame 1 so as to be slidable in the left-right direction in the figure via a guide rod 27 arranged parallel to the shaft 22.
8 is adapted to be adjusted to move in the left-right direction by rotating an adjustment handle 29 via a threaded rod 30 integrally attached to the handle 29. The air cylinder 25 is placed on this moving table 28.
is disposed so as to be movable in the left-right direction in the figure via a guide rod 31, and a spring 33 is disposed between the cylinder 25 and a bracket 32 integrally provided on the moving table 28. 25 is biased toward the right in the figure. Also, the air cylinder 25
A compressed air supply source 37 is connected to the chamber 34 through a conduit 36 in which a pressure reducing valve (pressure control valve) 35 is installed.
It is connected to the. The setting value of the pressure reducing valve 35 is such that when the workpiece W and the cone gear 17 come into contact with each other and the reaction force of their pressing force acts on the piston rod 26 to increase the air pressure inside the air cylinder 25, the air pressure in the air cylinder 25 increases. The air pressure inside is variably controlled so that it becomes a predetermined value. For example, load cell 2
When the pressing force detected by 4 exceeds a predetermined value, the set value of the pressure reducing valve 35 is reduced to reduce the supplied air pressure. As a result, the piston rod 26 within the cylinder 25 is pressed with a predetermined force in the advancing direction (to the left in the figure). Further, a roller 38 is attached to the bottom of the body of the air cylinder 25, and a cam 40 supported by a cam shaft 39 disposed orthogonally to the air cylinder 25 is in contact with the roller 38. The camshaft 39 is connected to the pillow blocks 41, 4
a pulley 42 rotatably supported by 1 and integrally attached to the camshaft 39;
Reducer 45 via belt 43 and pulley 44
is connected to the output shaft of the In addition, the input shaft of the reducer 45 is connected to a pulley 4 integrally attached to the same shaft.
6. It is connected to a variable speed motor 49 via a belt 47 and a pulley 48. The air cylinder 25, cam shaft 39, reducer 45, variable speed motor 49, etc. are all placed on the moving table 26, and when the moving table 28 is operated to move, the shaft 2
2. It is moved in the left-right direction in the figure integrally with the workpiece mounting jig 21. The cam 40, camshaft 39, speed reducer 45, and motor 49 constitute a moving mechanism 50 that reciprocates the workpiece mounting jig 21 via the air cylinder 25 and shaft 22.

Next, a method of conducting a friction and wear test using the test apparatus having the above configuration will be described. First, as shown in FIG. 3, the workpiece (synchronizer) W is attached to the workpiece attachment jig 21, and then the handle 29 is rotated to move the movable table 28 to a predetermined position in the left direction in the figure. Next, the motor 2 is started to rotate the cone gear 17 via the shafts 6, 15, etc. At this time, the rotational speed of the cone gear 17 is detected by the tachometer 11. After the cone gear 17 is brought into rotation in this manner, the motor 49 is started. Along with this, a belt 47, a reducer 45,
When the cam 40 is rotated via the belt 43 and the camshaft 39, and the high portion 40a of the cam 40 comes into contact with the roller 38, the air cylinder 25, shaft 22, and workpiece mounting jig 21 are integrated to move to the left in the figure. The workpiece W is pressed against the cone gear 17 while the lower part 4 of the cam 40
When 0b comes into contact with the roller 38, the air cylinder 25 is returned to the right in the figure by the biasing force of the spring 33, and accordingly, the shaft 22 and the workpiece mounting jig 21 are integrally moved in the same direction. The work W moves away from the cone gear 17.

At the moment when the workpiece W contacts the cone gear 17, a pressing force exceeding a predetermined value is not applied between them due to the penetrating force of the moving workpiece W support system.
Then, a reaction force of this pressing force greater than a predetermined value acts on the piston rod 26, and the air pressure in the air cylinder 25 attempts to rise rapidly, but as the pressing force increases, the set value of the pressure reducing valve 35 gradually increases. Since the air pressure is decreased, the air pressure is maintained at a predetermined value without increasing. Here, in the test apparatus described above, since the workpiece mounting jig 21 is supported by the air cylinder 25 so as to be freely retractable, the cone gear 17
When a pressing force of more than a predetermined value is not applied between the and the workpiece W, and this pressing force exceeds a predetermined force corresponding to the air pressure in the air cylinder 25, the piston 25a in the air cylinder 25 is pressed against the predetermined force. The pressing force is prevented from exceeding a predetermined value by retracting (moving to the right in the figure) in a balanced state. As a result, the pressing force F of the workpiece W against the cone gear 17 due to the rotation of the cam 40 reaches a ceiling at a predetermined force corresponding to the air inside the air cylinder 25, and as shown in FIG. It appears as a rectangular waveform. Further, the pressing force of the workpiece W against the cone gear 17 is detected by the load cell 24, and the wear amount of the workpiece W is detected by the displacement meter 23 as the amount of movement of the shaft 22.
detected by. Then, each detection amount accompanying the above-described operation, that is, the pressing force of the workpiece W against the cone gear 17, the number of times of pressing, and the cone gear 17
The torque applied to the workpiece W and the amount of wear on the workpiece W are each input into a computer, calculated based on a calculation formula built into the computer in advance, and automatically output as a change in the friction coefficient with respect to the wear formula.

In the above embodiment, the workpiece mounting jig 21 side is supported with a predetermined force applied by the air cylinder 25, but on the contrary, the workpiece W
The side on which the is pressed may be supported by the air cylinder 25.

As described above, the present invention includes an air cylinder that urges at least one of the pressed member or the workpiece mounting jig toward the other, and a load cell that detects the pressing force between the pressed member and the workpiece. , and a pressure control valve that controls the air pressure in the air cylinder to a predetermined value based on the detection results of this load cell, so that the pressing force acting between the workpiece and the pressed member is controlled by the air pressure in the air cylinder. When the predetermined force (biasing force) corresponding to is exceeded, the air cylinder retracts while being balanced with the predetermined force, and the pressing force reaches a ceiling at the predetermined force, causing the workpiece to be pressed against the pressed member at a constant level. It can be pressed with pressure, the pressing force can be easily set, and a highly accurate friction and wear test can be performed.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing the workpiece pressing force characteristics of a conventional friction and wear test device, FIGS. 2 and 3 show a schematic configuration of the friction and wear test device according to the present invention, and FIG. 3 is a side view, and FIG. 4 is a characteristic diagram showing the pressing force characteristics of the workpiece of the same apparatus. DESCRIPTION OF SYMBOLS 1... Frame, 2... Motor, 11... Tachometer, 13... Torque converter, 17... Cone gear (pressed member), 21... Workpiece mounting jig, 22...
...Axis, 23...Displacement meter, 24...Load cell, 2
5... Air cylinder, 25a... Piston, 26
...Piston rod, 27...Guide rod, 28...
...Moving table, 34...Chamber, 35...Pressure reducing valve,
36...Pipe line, 37...Compressed air supply source, 38...
...Roller, 40...Cam, 45...Reducer, 49
...Variable speed motor, 50...Movement mechanism, W...Work (synchronizer), O...Lubricating oil.

Claims (1)

[Claims] 1. A pressed member that is rotated by a drive source and against which a work is pressed, and a work that is arranged on the same axis as the rotational axis of the pressed member and that is moved in the axial direction by a moving mechanism. and a mounting jig, which rotates the pressed member, and moves and presses the workpiece attached to the workpiece mounting jig against the rotated pressed member using a moving mechanism, thereby reducing friction and wear of the workpiece. In a test device that performs a test, an air cylinder that urges at least one of the pressed member or the workpiece mounting jig toward the other;
Friction characterized by comprising a load cell that detects the pressing force between the pressed member and the workpiece, and a pressure control valve that controls the air pressure of the air cylinder to a predetermined value based on the detection result of the load cell. Abrasion test equipment.