JP4630793B2 - Friction tester and friction test method - Google Patents

Description

  The present invention relates to a friction tester and a friction test method. Specifically, the first member and the second member that are pressed against each other and relatively rotatable around a predetermined axis when mounted on an actual machine are respectively referred to as a first test piece and a second test piece. The present invention relates to a friction tester and a friction test method for measuring a frictional force between them.

  Conventionally, as a friction tester for testing the resistance against friction between two test pieces, a block-like test piece and a ring-like test piece that rotates while contacting the test piece are used. There is known a friction tester that measures a frictional force in a tangential direction of a contact portion generated by rotation of a ring-shaped test piece when the pieces are pressed against each other (see, for example, Patent Document 1).

  By the way, when testing materials used for the rotation mechanism of the refrigeration / compressor, it is desirable to test the materials in the same state as the state in which they are used. Examples of such test conditions include conditions such as reduced pressure such as vacuum, increased pressure, and a special gas atmosphere such as a refrigerant in a refrigerator. Furthermore, it is required to perform a test in a mixed state of a lubricant such as refrigeration oil and the special gas. Therefore, the test machine needs to seal the space in which the test piece is arranged.

  Further, a swash plate type compressor is often used as a refrigeration / compressor, and a swash plate as a rotating body is slidably in surface contact with the swash plate as a rotating body. A shoe is used (see FIG. 1 of JP-A-2005-220771). For example, in a swash plate compressor used in a car air conditioner, the rotation of the output shaft of the engine is transmitted via a belt, so that the rotation shaft of the swash plate is arranged horizontally. When performing a friction test between a shoe and a swash plate mounted on such a swash plate compressor, in order to obtain a test condition close to the mixed state of the lubricant and special gas in the actual machine, Therefore, it is better to arrange the rotating mechanism of the testing machine to rotate around the horizontal axis.

JP-A-5-34269

  However, in the conventional friction tester, the test piece must be processed so as to meet the specifications of the tester, and the friction test cannot be performed using the actual test piece as it is. In addition, in the conventional friction tester, although the rotating mechanism is arranged horizontally, the block-shaped test piece is pressed down vertically against the ring-shaped test piece, so the contact portion between the two is in line contact It was. For this reason, when the friction test between the shoe and the swash plate is performed, the friction test cannot be performed under test conditions close to the arrangement in which the shoe and the swash plate are in surface contact with each other.

  An object of the present invention is to provide a friction tester and a friction test method capable of testing under test conditions close to the state of use in an actual machine in which two test pieces are actually used.

The friction tester of the present invention is a first test piece and a second test piece, which are first and second members, which are pressed against each other when mounted on an actual machine and are relatively rotatable around a predetermined axis, respectively. A friction tester for measuring a frictional force between these two test pieces, which stores both the test pieces and has substantially the same pressure as the pressure state in which the first member and the second member are arranged in the actual machine. A body frame in which a state measurement space is formed, and a first holder body and a second holder body for holding the test pieces in a state of facing each other in the body frame, A test piece holding mechanism in which an axis perpendicular to the surface is an axis parallel to the predetermined axis of the actual machine, a pressure contact mechanism connected to the test piece holding mechanism, and pressing the opposing surfaces of the two test pieces together. Connected to the specimen holding mechanism, the first holder book Provided with a rotation mechanism for relatively rotating said second holder main body as a rotation about the orthogonal axes, and a frictional force measuring mechanism for measuring the frictional force generated in the both tests pieces by the rotating mechanism, wherein The first holder main body is connected to and supported by the pressure-contacting mechanism so as to be movable along the orthogonal axis, and a fixing portion for preventing the first test piece from rotating in the facing surface, and the fixing And a shaft portion that rotatably supports the second test piece around the orthogonal axis, and the second holder body is connected to the second test piece, and the orthogonal axis It is connected to and supported by the rotation mechanism so as to be rotatable around .

Here, the actual machine means an apparatus in which a test piece is actually used as a constituent member as it is.
In such a configuration, the measurement space is in a pressure state that is substantially the same as the pressure state in the actual machine. For example, friction tests can be performed under various pressures, such as under reduced pressure such as vacuum or under pressure. Further, if a special gas is sealed by putting a lubricant inside, the atmosphere becomes close to a mixed state of the lubricant and the special gas in an actual machine. Then, in this measurement space, the test piece holding mechanism holds the two test pieces facing each other, and presses the opposing surfaces of the two test pieces against each other by the pressure contact mechanism, while making the two test pieces relatively Rotate. At this time, since the rotation axis is a direction orthogonal to the opposing surface, the frictional force in the tangential direction of the contact surface can be measured by the frictional force measuring mechanism. Further, since the rotation axis of the rotation mechanism is arranged in parallel with the predetermined axis of the actual machine, the arrangement state of the lubricant and the test piece in the measurement space is close to the state of the actual machine.

  According to the present invention, it is possible to perform a friction test on both test pieces under test conditions close to the usage state in an actual machine in which two test pieces are actually used. Therefore, highly reliable friction evaluation can be performed.

Here, it is preferable that the two test pieces are each processed into a shape to be held by the test piece holding mechanism. In particular, the other test piece (shaft side test piece) is preferably disc-shaped and has a through hole at the center.
In such a configuration, one test piece (fixed portion side test piece) is fixed to the fixed portion of the first holder body, and the shaft portion side test piece is freely rotatable on a shaft member extending to the fixed portion. Supported by
At this time, by forming the shaft portion into a columnar shape, the shaft portion can be smoothly inserted into the through hole of the shaft portion test piece, and the test piece can be easily rotated with respect to the shaft portion during the test. Further, the shaft member side test piece may be locked by screwing into a male screw formed at the tip of the shaft member using a nut as a locking member.
The pressure contact mechanism moves the first and second holder main bodies in a relatively approaching direction along the orthogonal axis, and the rotation mechanism relatively moves the first and second holder main bodies around the orthogonal axis. Rotate. Then, since the axial part side test piece is connected with the 2nd holder main body, the fixed part side test piece fixed to the 1st holder main body, and the axial part side test connected to the 2nd holder main body. The pieces rotate relative to each other while being pressed against each other.

According to the present invention, the first and second holder main bodies can be integrally held so that the two test pieces are brought into surface contact with each other and relatively rotated around an axis orthogonal to the contact surface. Further, the first and second holder main bodies can relatively rotate both test pieces while applying a load that presses the two test pieces against each other.
Therefore, if the test piece holding mechanism constituted by these first and second holder main bodies is used, the rotation axis of the rotation mechanism can be easily arranged so as to be parallel to the predetermined axis of the actual machine. The friction test can be performed under the test conditions close to the use state in the actual machine in which the test piece is actually used. Therefore, highly reliable friction evaluation can be performed.

In the friction tester of the present invention, the first member is a shoe having a spherical surface, the second member is a swash plate to which the shoe is pressed, and the first holder body is the shoe. It is preferable that a recess for fitting the is formed.
Here, the shoe and the swash plate refer to a shoe and a swash plate attached to a swash plate type compressor used for a refrigerator / compressor.
Conventionally, when performing a friction test between a shoe and a swash plate used in a swash plate compressor, there is a problem that the hemispherical shoe has to be processed into a block shape or the like in order to be held by the test piece holding mechanism.

  In the present invention, in order to solve such a problem, the shoe used in the actual machine can be fitted and fixed to the recess of the first holder body in the same shape. Therefore, the friction test can be performed in a state close to a use state in an actual machine. In addition, it is not necessary to process the test piece for the friction test, and the test time can be shortened.

  In the friction tester of the present invention, the press contact mechanism includes a press contact rotary shaft, one end of which is disposed on the outside of the main body frame and the other end is rotatably disposed in the measurement space of the main body frame. A load generator that applies a rotational force to one end of the rotary shaft, and a long arm that is attached to the other end of the press-contact rotary shaft in a direction orthogonal to the rotary shaft and rotates to the press-contact rotary shaft. When a force is applied, it is preferable that the tip of the turning arm moves the first holder main body in a direction approaching the second holder main body.

  According to such a configuration, when a load generator such as a hydraulic cylinder applies a rotational force to the pressure rotating shaft, an arm attached to the other end of the pressure rotating shaft protruding into the measurement space turns. . Then, the arm tip acts to push the first holder body in a direction approaching the second holder body.

Here, since the pressure contact rotary shaft passes through the outside of the main body frame and the measurement space in the main body frame, the internal pressure applied to the cross section of the pressure contact rotary shaft acts in the direction of pushing the pressure contact rotary shaft outward.
According to this invention, even if a force in the direction of pushing the rotary shaft for pressing outward is applied by the internal pressure, the rotary shaft for pressing is provided for transmitting the rotational force, so that the internal pressure in the axial direction is Does not affect the rotational force of the rotary shaft for pressure welding. In other words, even if the rotary shaft for press contact passes through the outside of the main body frame and the measurement space, the internal pressure does not affect the force pushing the first holder main body, and the error of the press contact force of the press contact mechanism is reduced. can do.

In the test method of the present invention, a first member and a second member that are pressed against each other and relatively rotatable around a predetermined axis when mounted on an actual machine are defined as a first test piece and a second test piece, respectively. A friction test method for measuring a friction force between two test pieces, the pressure state being substantially the same as a pressure state in which both the test pieces are housed and the first member and the second member are arranged in the actual machine. within the measurement space, the both specimens are opposed to each other, as an axis parallel to the predetermined axis of the shaft is the actual orthogonal to the facing surface, to rotate the first test strip within the facing surface The second test piece is supported rotatably around the orthogonal axis, and a load is applied to press the opposing surfaces of the two test pieces together while rotating the orthogonal axis between the two test pieces. Rotate relative to the center between the two specimens And measuring the frictional force generated.

In the present invention, two test pieces are held in a state of facing each other in a measurement space having a pressure state substantially the same as the pressure state in an actual machine. And while applying the load which press-contacts both test pieces mutually, both test pieces are rotated relatively around the axis | shaft orthogonal to a contact surface. In this state, the frictional force in the tangential direction of the contact surface is measured. At this time, the orthogonal axis is arranged in parallel with a predetermined axis of the actual machine.
According to this invention, it is possible to obtain the same effect as that of the friction tester described above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Configuration of friction tester]
FIG. 1 is a front view showing a schematic configuration of a friction tester according to an embodiment of the present invention. As shown in FIG. 1, the friction tester 1 includes a gantry 3 installed on a horizontal foundation and a main body unit 2 placed on the gantry 3.
2 and 3 are sectional views of the main body unit 2 of the friction tester 1 as seen from the front and from above. As shown in FIG. 2, the main unit 2 includes a main body frame 21 in which a measurement chamber 22 as a measurement space and a pressure contact chamber 23 communicating with the measurement chamber 22 are formed, and two test pieces arranged in the measurement chamber 22. A test piece holding mechanism 5 for holding, a pressure contact mechanism 6 for applying a load to two test pieces in the pressure contact chamber 23, a rotating mechanism 7 for rotating one test piece, and a test piece between the test pieces as shown in FIG. A rotational force meter 71 as a frictional force measuring mechanism for measuring the frictional force is provided.
The main body frame 21 is configured so that the measurement chamber 22 and the pressure contact chamber 23 can be sealed by the lids 24 and 25, the bearing holding member 72 and the rotating shaft holding member 63.

FIG. 4 is a cross-sectional view seen from the front showing the test piece holding mechanism 5 of the main unit 2. As shown in FIG. 4, the test piece holding mechanism 5 includes a first holder main body 51 and a second holder main body 52.
The first holder main body 51 is connected to one end of the press contact mechanism 6. The first holder body 51 includes a fixing portion 53 for fixing the shoe 41 as one test piece, a shaft portion 54 for rotatably supporting a swash plate 42 as the other test piece, and a swash plate 42 as a shaft portion. And a locking nut 55 that locks to 54.

Here, the shape of the shoe 41 is hemispherical, and this shape is also used in actual machines. The swash plate 42 is disk-shaped and has a through hole at the center, and is processed into a shape having a plurality of holes through which the knock pin 52A is inserted around the through hole.
The fixed portion 53 is disk-shaped, and three hemispherical concave portions 53A are formed at equal intervals on the circumference of a predetermined radius from the axis on the disk surface. The hemispherical shoe 41 is fitted into each hemispherical recess 53A.
The shaft portion 54 has a stepped columnar shape and is integrally formed so as to be coaxial with the fixed portion 53, and has a male screw 54A at the shaft end. Then, after the shoe 41 is fitted into the fixing portion 53, the swash plate 42 is inserted through the shaft portion 54 into the through hole. In this way, the shoe 41 is disposed so as to be sandwiched between the fixing portion 53 and the swash plate 42, and the contact surface between the shoe 41 and the swash plate 42 extends in the axial direction of the first holder body 51. It arrange | positions so that it may orthogonally cross.
The locking nut 55 is screwed with the male screw 54 </ b> A of the shaft portion 54 so that the swash plate 42 does not fall off from the shaft portion 54. Accordingly, the shaft portion 54 can be smoothly inserted into the through hole of the swash plate 42, and the swash plate 42 can be smoothly rotated with respect to the shaft portion 54.

  The second holder main body 52 is connected to one end of the rotation mechanism 7 and is provided to be rotatable around the horizontal axis with respect to the first holder main body 51. The second holder body 52 is connected to the swash plate 42 by a knock pin 52A, and rotates around the horizontal axis together with the swash plate 42.

Further, as shown in FIG. 2, the rotation mechanism 7 includes a drive shaft 73 provided so that one end protrudes into the measurement chamber 22, a bearing holding member 72 that rotatably supports the drive shaft 73, As shown in FIG. 1, an electric motor 75 disposed on the gantry 3 is provided.
As shown in FIG. 2, the second holder body 52 is fitted to one end of the drive shaft 73, and is further connected by a positioning pin 74. As a result, the rotational force of the drive shaft 73 is reliably transmitted to the second holder body 52 by the positioning pins 74.
As shown in FIG. 1, an output shaft 75 </ b> A of an electric motor 75 is connected to the other end 73 </ b> A of the drive shaft 73 protruding from the main body unit 2 via a rotational force meter 71 described later. Thereby, the rotational force of the electric motor 75 is transmitted to the drive shaft 73, and the swash plate 42 is rotated via the second holder body 52.
The rotational force meter 71 measures the rotational force transmitted from the electric motor 75 to the drive shaft 73.

As shown in FIG. 1, the press-contact mechanism 6 includes a load generator 64 installed outside the main unit 2, a press-contact rotary shaft 61, and a press-contact rotary shaft 61 as shown in FIGS. 2 and 3. A lever 66 attached to one end of the main unit 2 projecting to the outside, an arm 65 attached to the other end of the press-contact rotary shaft 61 projecting into the measurement chamber 22, and the press-contact rotary shaft 61 are rotatable. And a pressing force transmission shaft 62 connected to the first holder main body 51.
As the load generator 64, for example, a device such as a hydraulic cylinder can be used. That is, the load generator 64 is a device that includes a rod 64A that moves in the vertical direction and that can move freely.
The lever 66 is composed of a long member that turns around the axis of the rotary shaft 61 for pressure contact, and is arranged so that the tip thereof is in contact with the tip of the rod 64A. In this way, when the load generator 64 moves the rod 64A upward, the lever 66 turns, so that a rotational force is applied to the press-contact rotary shaft 61.

The rotary shaft 61 for pressure contact is provided by the rotary shaft holding member 63 so as to penetrate the pressure contact chamber 23 and the outside of the main unit 2.
The arm 65 is composed of a long member that pivots about the axis of the rotary shaft 61 for press contact, and a hexagon bolt 65A is screwed to the tip, and the head of the hexagon bolt 65A is connected to one end of the press contact force transmission shaft 62. It arrange | positions so that it may contact | abut. In this way, the arm 65 pivots due to the rotational force applied to the pressure contact rotary shaft 61, so that the pressure contact force transmission shaft 62 is pushed in the axial direction.
The pressure contact force transmission shaft 62 has a substantially elliptical cross section and is arranged so as to be coaxial with the rotation axis of the test piece holding mechanism 5, and penetrates the communication portion between the pressure contact chamber 23 and the measurement chamber 22. Yes. Further, the pressure contact force transmission shaft 62 is supported so that the central portion thereof can be moved in the axial direction by a transmission shaft holding member 62B. Here, the transmission shaft holding member 62B is cylindrical and fixed to the communicating portion, and a through hole having a substantially elliptical cross section is formed. The pressure contact force transmission shaft 62 is inserted into the substantially elliptical through hole, and rotation around the shaft of the pressure contact force transmission shaft 62 is prevented.
The other end of the pressure contact force transmission shaft 62 is connected to the first holder main body 51 via the locking member 62A. When the pressure contact force transmission shaft 62 is pushed in the axial direction by the arm 65 in this way, the first holder body 51 is pushed in the direction approaching the second holder body 52, and the shoe 41 and the swash plate 42 are pressed. It has become so.

  In this manner, the opposing surfaces of the shoe 41 and the swash plate 42 are pressed against each other by the press contact mechanism 6, and friction force is generated in the tangential direction of the contact surface by the rotation of the swash plate 42 by the rotation of the rotation mechanism 7. It is configured.

  In addition, since the test oil 26 is mixed in the measurement chamber 22 and the test oil holding mechanism 5 is rotated, the test oil 26 is sprung up, so that the test oil holding mechanism 5 is made smooth by the test oil 26. Can be rotated.

[Friction test method]
Next, a test method in the friction tester 1 having such a configuration will be described.
First, the test piece holding mechanism 5 to which the shoe 41 and the swash plate 42 are fixed is installed in the measurement chamber 22. Next, the test oil 26 and the test gas are sealed in the measurement chamber 22. Next, the load generator 64 of the press contact mechanism 6 is operated to generate a rotational force on the press contact rotary shaft 61 via the lever 66. Then, the press-contact rotary shaft 61 pushes the press-contact force transmission shaft 62 in the axial direction via the arm 65, the first holder main body 51 is pushed in the direction close to the second holder main body 52, and the shoe 41 and the swash plate 42 is pressed.

  When the rotating mechanism 7 is rotated in this state, the swash plate 42 rotates with respect to the shoe 41, and a frictional force in the tangential direction of the contact surface is generated. Here, since the frictional force between the shoe 41 and the swash plate 42 acts in a direction in which the rotation of the second holder main body 52 is to be prevented, the second holder is provided by the rotational force meter 71 provided in the rotation mechanism 7. If the rotational force applied to the main body 52 is measured, the frictional force between the shoe 41 and the swash plate 42 can be obtained from the measured value.

[Effect of friction tester]
Therefore, according to the present embodiment, the following effects can be obtained.
(1) In the measurement chamber 22, the shoe 41 and the swash plate 42 are held in a state of facing each other on the test piece holding mechanism 5, and the swash plate 42 is rotated by the rotating mechanism 7 while being pressed against each other by the pressing mechanism 6. It was made to make it composition. At this time, since the contact surface is in a direction perpendicular to the rotation axis, the frictional force in the tangential direction of the contact surface between the shoe 41 and the swash plate 42 can be measured. Accordingly, the friction test can be performed in the same state as the pressure contact state when the shoe 41 and the swash plate 42 are used in an actual machine, and a highly reliable friction evaluation can be performed.

(2) Since the rotating shaft of the rotating mechanism 7 is arranged horizontally and is arranged in the same manner as the rotating shaft of the actual machine, the mixed state of the test oil 26 and the test gas in the measurement chamber 22 is the state in the actual machine. Can be in the same state. Accordingly, it is possible to perform a friction test under test conditions close to the usage state in an actual machine in which the shoe 41 and the swash plate 42 are actually used, and a highly reliable friction evaluation can be performed.

(3) Since the measurement chamber 22 is hermetically sealed, a test gas can be enclosed in the measurement chamber 22 to obtain a predetermined pressure, and a friction test can be performed with substantially the same pressure state as the actual machine. . Accordingly, it is possible to perform a friction test under test conditions close to the usage state in an actual machine in which the shoe 41 and the swash plate 42 are actually used, and a highly reliable friction evaluation can be performed.

(4) The shoe 41 used in the actual machine can be fitted and fixed to the hemispherical recess 53A of the first holder main body 51 in the same shape. Therefore, the friction test can be performed in a state close to a use state in an actual machine. Further, it is not necessary to process the shoe 41 for the friction test, and the preparation time for the test can be shortened.

(5) Since the rotary shaft 61 for pressure contact is provided to transmit the rotational force, even if a force pushing outward in the axial direction is applied to the rotary shaft 61 for pressure by the internal pressure of the measurement chamber 22, The rotational force of the shaft 61 is not affected. That is, even if the pressure contact rotary shaft 61 is arranged to penetrate the outside of the main body frame 21 and the measurement chamber 22, the internal pressure of the measurement chamber 22 may affect the force pushing the first holder main body 51. Therefore, the error of the pressure contact force of the pressure contact mechanism 6 can be reduced.

(6) Since the shoes 41 are respectively fitted into the three hemispherical recesses 53A formed in the first holder body 51, the swash plate is moved by the three shoes 41 when pressed against the swash plate 42. 42 is in a state where three points are supported. Therefore, the pressure contact state between the shoe 41 and the swash plate 42 is stabilized, and a highly accurate friction test can be performed.

(7) Since the shoe 41 and the swash plate 42 are integrally attached to the first holder body 51 in a state where they are in contact with each other, the shoe 41 and the swash plate 42 are attached to individual holders. Therefore, the shoe 41 and the swash plate 42 can be easily attached and the test piece holding mechanism 5 can be easily installed in the measurement chamber 22 as compared with the structure in which the opposing surfaces are brought into contact with each other. Therefore, the friction test can be performed smoothly.

(8) Since the lever 66 is disposed opposite to one end of the pressing rotary shaft 61 with respect to the arm 65 fixed to the other end of the pressing rotary shaft 61, the load generator 64 is connected to the pressing rotary shaft 61. They can be arranged orthogonally. As a result, the friction tester can be made more compact than the case where the load generator 64 and the pressure rotating shaft 61 are arranged coaxially, and the installation area can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above embodiment, the electric motor 75 is installed as a drive source of the rotation mechanism 7, but a hydraulic motor other than the electric motor 75 may be used as the drive source. In the above embodiment, the load generator 64 of the press contact mechanism 6 applies the rotational force to the press contact rotary shaft 61 via the lever 66. However, there is another method for applying the rotary force to the press contact rotary shaft 61. The method may be used. For example, a method of transmitting the rotational force of the electric motor to the pressure rotating shaft 61 using a timing belt by using a pressure welding electric motor may be used.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  The present invention can be used for a friction test of materials used for a rotating mechanism of a refrigeration / compressor, and can also be used for a friction test of various materials.

The front view which shows the whole structure of one Embodiment which concerns on the friction testing machine of this invention. Sectional drawing seen from the front of the main body unit with which the friction tester of embodiment same as the above was equipped. Sectional drawing seen from the upper direction of the main body unit with which the friction tester of embodiment same as the above was equipped. Sectional drawing seen from the front of the test piece holding | maintenance mechanism with which the main body unit of embodiment same as the above was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Friction tester 5 ... Test piece holding mechanism 6 ... Pressure contact mechanism 7 ... Rotating mechanism 21 ... Main body frame 22 ... Measurement chamber (measurement space)
41 ... shoe (first test piece)
42 ... Swash plate (second test piece)
DESCRIPTION OF SYMBOLS 51 ... 1st holder main body 52 ... 2nd holder main body 53 ... Fixing part 53A ... Hemispherical recessed part 54 ... Shaft part 61 ... Rotary shaft for press contact 64 ... Load generator 65 ... Arm 71 ... Tactometer (friction force measurement) mechanism)

Claims (4)

A first member and a second member, which are pressed against each other and relatively rotatable around a predetermined axis when mounted on an actual machine, are used as a first test piece and a second test piece, respectively, and the friction between these two test pieces. A friction tester for measuring force,
A main body frame in which a measurement space is formed in which the first member and the second member are housed in the same pressure state as the pressure state in which the first member and the second member are arranged in the actual machine;
The body frame has a first holder body and a second holder body for holding the two test pieces in a state of facing each other, and an axis perpendicular to the facing surface is the predetermined axis of the actual machine. A specimen holding mechanism having an axis parallel to
A pressure contact mechanism that is connected to the test piece holding mechanism and presses the opposing surfaces of the two test pieces together;
A rotation mechanism that is coupled to the test piece holding mechanism and relatively rotates the first holder body and the second holder body about the orthogonal axis as a rotation center;
A friction force measuring mechanism for measuring the friction force generated between the two test pieces by the rotating mechanism,
The first holder body is connected and supported by the pressure contact mechanism movably along the orthogonal axis, and a fixing portion for preventing the first test piece from rotating in the facing surface, A shaft portion that extends to a fixed portion and supports the second test piece rotatably around the orthogonal axis;
The friction tester, wherein the second holder body is connected to the second test piece and connected to and supported by the rotating mechanism so as to be rotatable about the orthogonal axis. The friction tester according to claim 1 ,
The first member is a shoe having a spherical surface, the second member is a swash plate to which the shoe is pressed, and the first holder body is formed with a recess for fitting the shoe. A friction tester characterized by In the friction tester according to claim 1 or 2 ,
The pressure contact mechanism has a pressure contact rotary shaft, one end of which is disposed on the outside of the main body frame and the other end is rotatably disposed in the measurement space of the main body frame.
A load generator that applies a rotational force to one end of the rotary shaft for pressure welding;
It is attached to the other end of the rotary shaft for pressure welding and is configured to include a longitudinal arm in a direction orthogonal to the rotary shaft,
A friction tester characterized in that, when a rotational force is applied to the pressure contact rotary shaft, the tip of the turning arm moves the first holder main body in a direction approaching the second holder main body. A first member and a second member, which are pressed against each other and relatively rotatable around a predetermined axis when mounted on an actual machine, are used as a first test piece and a second test piece, respectively, and the friction between these two test pieces. A friction test method for measuring force,
The two test pieces substantially in a measuring space of the same pressure conditions as the first member and the second member causes accommodated with the pressure state of being arranged in the real machine, are opposed to the both specimens with each other, the facing surface The axis orthogonal to the axis is parallel to the predetermined axis of the actual machine, and the first test piece is prevented from rotating in the facing surface, and the second test piece is rotatable about the orthogonal axis. A frictional force generated between the two test pieces by rotating the two test pieces relative to each other about the orthogonal axis while applying a load that presses the opposing surfaces of the two test pieces together. A friction test method characterized by measuring

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