JP2021038797A - Speed-increasing gear - Google Patents

Abstract

To suppress generation of noise.SOLUTION: Rubber members 73 energizing a ring 34 are respectively disposed between each of opposite members 72 and an edge 34e at a low speed shaft 16 side, of a ring 34. The ring 34 is energized in a direction to separate from the pair of opposite members 72 by energization force of each of the rubber members 73, thus each insertion portion 71 is kept in a state of being kept into contact with a region positioned at a low-speed shaft 16 side of an inner peripheral surface of each insertion hole 61 in an axial direction of the low-speed shaft 16.SELECTED DRAWING: Figure 4

Description

The present invention relates to a speed increaser.

The speed increaser has a plate-shaped arm that is connected to the end of the low-speed shaft and rotates integrally with the low-speed shaft, and a cylinder that extends in the axial direction of the low-speed shaft toward the side opposite to the low-speed shaft with respect to the arm. It has a shaped ring and. Between the high-speed shaft arranged inside the ring and the ring, a roller that contacts both the ring and the high-speed shaft is provided. Then, the speed increaser rotates the high-speed shaft at a higher speed than the low-speed shaft by transmitting the power from the low-speed shaft to the high-speed shaft via the arm, the ring, and the roller.

For example, in Patent Document 1, a plurality of locking notches are formed at the end edge of the ring on the low-speed shaft side, and projecting pieces to be locked to the plurality of locking notches are provided on the arm, and each projecting piece is locked. The arm is engaged with the ring by locking in the notch. Then, a retaining ring (circlip) is used to prevent the ring from coming off in the axial direction with respect to the ring in the arm.

Japanese Unexamined Patent Publication No. 2006-322525

However, in Patent Document 1, the number of parts increases because the retaining ring is used to prevent the ring from coming off in the arm. Therefore, for example, as shown in FIG. 11, a pair of insertion holes 101h are formed at both portions located on both sides in the radial direction of the ring 101, and a pair of insertion portions 103a to be inserted into the pair of insertion holes 101h are armed. It is provided in 103. Then, it is conceivable that the arm 103 is engaged with the ring 101 by inserting the pair of insertion portions 103a into the pair of insertion holes 101h, respectively. According to this, since the pair of insertion portions 103a are inserted into the pair of insertion holes 101h, the ring 101 in the arm 103 is prevented from coming off in the axial direction, as in Patent Document 1. There is no need to use a retaining ring, and an increase in the number of parts can be suppressed.

However, in order to insert the pair of insertion portions 103a into the pair of insertion holes 101h, a certain amount of gap is required between the insertion portions 103a and the insertion holes 101h. Then, in a state where the pair of insertion portions 103a are inserted into the pair of insertion holes 101h, when the arm 103 rotates in the direction of the arrow R100 shown in FIG. 12 as the low speed shaft 102 rotates, each insertion portion 103a Is pressed against a portion of the inner peripheral surface of each insertion hole 101h located in the rotational direction of the arm 103. Here, since the torque is relatively large during high-speed rotation, even if the torque fluctuates and the torque becomes small, each insertion portion 103a is positioned in the rotation direction of the arm 103 on the inner peripheral surface of each insertion hole 101h. The state of being pressed against the part to be pressed is maintained.

On the other hand, at low speed rotation, the torque is smaller than at high speed rotation. Therefore, when the torque fluctuates and the torque becomes smaller during low-speed rotation, each insertion portion 103a is separated from a portion of the inner peripheral surface of each insertion hole 101h that is located in the rotation direction of the arm 103. It is pressed against a portion of the inner peripheral surface of the insertion hole 101h that is located in the direction opposite to the rotation direction of the arm 103. Then, when the torque fluctuates and the torque increases during low-speed rotation, each insertion portion 103a is pressed again against a portion of the inner peripheral surface of each insertion hole 101h located in the rotation direction of the arm 103. Therefore, at low speed rotation, each insertion portion 103a is located on the inner peripheral surface of each insertion hole 101h in the rotation direction of the arm 103 and in the direction opposite to the rotation direction of the arm 103 as the torque fluctuates. It will repeatedly collide with both parts located in, and abnormal noise will be generated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a speed increasing machine capable of suppressing the generation of abnormal noise.

The speed increasing machine that solves the above problems includes a plate-shaped arm that is connected to the end of the low-speed shaft and rotates integrally with the low-speed shaft, and an arm that faces the opposite side of the low-speed shaft. A tubular ring extending in the axial direction of the low-speed shaft, and a roller provided between the high-speed shaft arranged inside the ring and the ring, and a roller that abuts on both the ring and the high-speed shaft. The ring has a pair of insertion holes into which the arm is inserted, the arm has a pair of insertion portions to be inserted into the pair of insertion holes, and the pair of insertion portions is the pair. The arm is engaged with the ring by being inserted into the insertion holes of the speed increasing machine, and the power from the low speed shaft is transmitted to the high speed shaft. The end edge has a specific portion, the pair of insertion holes are formed on the extension of the specific portion in the axial direction, and the end edge deviated from the specific portion is connected to the low speed shaft. At the same time, an urging member facing the edge is provided, and the ring is urged by the urging member to bring the insertion hole into contact with the insertion portion, so that the arm and the ring are brought into contact with each other due to torque fluctuation. Mitigates the impact.

According to this, the ring is urged by the urging member, and each insertion hole and each insertion portion are maintained in contact with each other. Therefore, for example, at low speed rotation, torque fluctuation occurs and the torque becomes small, and when each insertion portion moves away from a portion located in the rotation direction of the arm on the inner peripheral surface of each insertion hole, Each insertion portion moves while abutting on each insertion hole. Further, for example, during low-speed rotation, torque fluctuates and the torque increases, and each insertion portion moves away from a portion located on the inner peripheral surface of each insertion hole in a direction opposite to the rotation direction of the arm. Also, each insertion portion moves while abutting on each insertion hole. Therefore, as the torque fluctuates during low-speed rotation, each insertion portion is located on the inner peripheral surface of each insertion hole in both the portion located in the rotation direction of the arm and the portion located in the direction opposite to the rotation direction of the arm. The impact force when repeatedly colliding with the vehicle is relaxed. As a result, the generation of abnormal noise can be suppressed.

In the speed increasing machine, each of the insertion holes has an elongated hole shape whose longitudinal direction extends in the circumferential direction of the ring, and the outer surface of each insertion portion extends along the inner peripheral surface of each insertion hole. It is good.
According to this, for example, as compared with the case where each insertion hole has a perfect circular shape and the outer surface of each insertion portion extends along the inner peripheral surface of each perfect circular insertion hole, the ring has an arm. It is possible to suppress tilting with respect to.

In the speed increaser, the inner peripheral surfaces of the respective insertion holes are located on both sides of the pair of insertion hole planes extending in the circumferential direction of the ring and the pair of insertion hole planes connected to each other. The ring is formed of a pair of arcuate surfaces of insertion holes extending in an arc shape so as to be recessed in the circumferential direction of the ring, and the outer surfaces of the respective insertion portions are along the planes of the pair of insertion holes. It is preferable that it is formed of a pair of insertion part planes extending from each other and a pair of insertion part arc surfaces that connect the pair of insertion part planes and extend along the pair of insertion hole arc surfaces.

According to this, the ring is urged by the urging member, and in each insertion portion, the insertion portion plane located on the low speed shaft side of the pair of insertion portion planes is moved to the low speed shaft side of the pair of insertion hole planes. It is maintained in contact with the flat surface of the insertion hole in which it is located. Here, for example, in the case of low-speed rotation, torque fluctuation occurs and the torque becomes small, and each insertion portion moves so as to be separated from a portion located in the rotation direction of the arm on the inner peripheral surface of each insertion hole. Think. In this case, each insertion part moves while the insertion part plane located on the low speed shaft side of the pair of insertion part planes abuts on the insertion hole plane located on the low speed shaft side of the pair of insertion hole planes. The insertion part arc plane located in the direction opposite to the rotation direction of the arm among the insertion part arc planes follows the insertion hole arc plane located in the direction opposite to the arm rotation direction among the pair of insertion hole arc planes. Contact. Therefore, the impact force when each insertion portion collides with a portion located on the inner peripheral surface of each insertion hole in the direction opposite to the rotation direction of the arm is likely to be relaxed.

Further, for example, during low-speed rotation, torque fluctuates and the torque increases, and each insertion portion moves away from a portion located on the inner peripheral surface of each insertion hole in a direction opposite to the rotation direction of the arm. Consider the case of doing. Also in this case, each insertion portion moves while the insertion portion plane located on the low speed shaft side of the pair of insertion portion planes abuts on the insertion hole plane located on the low speed shaft side of the pair of insertion hole planes. Then, the insertion portion arc surface located in the rotation direction of the arm of the pair of insertion portion arc surfaces abuts so as to follow the insertion hole arc surface located in the arm rotation direction of the pair of insertion hole arc surfaces. Therefore, the impact force when each insertion portion collides with a portion located in the rotation direction of the arm on the inner peripheral surface of each insertion hole is easily relaxed. Therefore, as the torque fluctuates during low-speed rotation, each insertion portion is located on the inner peripheral surface of each insertion hole in both the portion located in the rotation direction of the arm and the portion located in the direction opposite to the rotation direction of the arm. The impact force when repeatedly colliding with the vehicle is easily relaxed. As a result, it is possible to further suppress the generation of abnormal noise.

In the speed increaser, assuming that the direction in which the straight line connecting the pair of insertion holes extends is the first direction and the direction intersecting the first direction in the radial direction of the ring is the second direction, the urging member is It may be composed of a plate-shaped facing member extending in the second direction and connected to the arm, and an elastic member interposed between the facing member and the end edge.

Such an opposing member and an elastic member are provided at the edge of the ring on the low-speed shaft side, which is deviated from a specific portion, are connected to the low-speed shaft, and face the edge of the ring on the low-speed shaft side. It is suitable as an urging member.

In the speed increasing machine, it is preferable that the facing member is formed with a housing recess for accommodating the elastic member.
According to this, by accommodating the elastic member in the accommodating recess, the elastic member can be positioned with respect to the opposing member, so that workability when inserting each insertion portion into each insertion hole can be improved. it can.

In the speed increasing machine, a part of the edge of the ring on the low speed shaft side may be a ring recess for accommodating the elastic member.
According to this, the elastic member can be positioned with respect to the opposing member by accommodating the elastic member in the ring recess. Therefore, in order to position the elastic member, for example, even when the accommodating recess for accommodating the elastic member is formed in the opposing member, the depth of the accommodating recess can be minimized. It is possible to easily secure the rigidity.

In the speed increasing machine, the elastic member may be a rubber member.
The rubber member is interposed between the facing member and the edge of the ring on the low-speed shaft side, and urges the ring to bring the insertion hole and the insertion portion into contact with each other, so that the arm and the ring are brought into contact with each other due to torque fluctuation. It is suitable as an elastic member that constitutes a part of an urging member for cushioning an impact.

According to the present invention, the generation of abnormal noise can be suppressed.

A side sectional view showing a centrifugal compressor in an embodiment. FIG. 2-2 is a cross-sectional view taken along the line 2-2 in FIG. An exploded perspective view showing a part of the speed increaser. Vertical sectional view of the ring member. Top view of the ring member. Front view of the arm. FIG. 6 is a sectional view taken along line 7-7 in FIG. The plan view which shows the part of the ring member enlarged. The cross-sectional view which shows the insertion hole and the insertion part enlarged. (A) is a cross-sectional view showing a state in which torque fluctuates and the torque becomes small at low speed rotation, and (b) is a cross-sectional view showing a state in which torque fluctuates and torque becomes large at low speed rotation. The perspective view of the ring member in the conventional example. The plan view of the ring member in the conventional example.

Hereinafter, an embodiment in which the speed increaser is embodied will be described with reference to FIGS. 1 to 10. The speed increaser of this embodiment is provided in a centrifugal compressor. A centrifugal compressor is mounted on a fuel cell vehicle (FCV) that runs on a fuel cell as an electric power source, and supplies air to the fuel cell.

As shown in FIG. 1, the housing 11 of the centrifugal compressor 10 includes a motor housing 12, a speed-up gear housing 13 connected to the motor housing 12, a plate 14 connected to the speed-up gear housing 13, and a plate 14. A compressor housing 15 connected to the above is provided. The motor housing 12, the speed increaser housing 13, the plate 14, and the compressor housing 15 are made of, for example, a metal material made of aluminum. The housing 11 has a substantially tubular shape. The motor housing 12, the speed increaser housing 13, the plate 14, and the compressor housing 15 are arranged in this order in the axial direction of the housing 11.

The motor housing 12 has a bottomed cylindrical shape having a disk-shaped bottom wall 12a and a peripheral wall 12b extending in a cylindrical shape from the outer peripheral edge of the bottom wall 12a. The speed increaser housing 13 has a bottomed cylindrical shape having a disk-shaped bottom wall 13a and a peripheral wall 13b extending in a cylindrical shape from the outer peripheral edge of the bottom wall 13a.

The end of the peripheral wall 12b of the motor housing 12 opposite to the bottom wall 12a is connected to the bottom wall 13a of the speed increaser housing 13. The opening of the peripheral wall 12b of the motor housing 12 on the opposite side of the bottom wall 12a is closed by the bottom wall 13a of the speed increaser housing 13. A through hole 13h is formed in the central portion of the bottom wall 13a.

The end of the peripheral wall 13b of the speed increaser housing 13 opposite to the bottom wall 13a is connected to the plate 14. The opening of the peripheral wall 13b of the speed increaser housing 13 on the side opposite to the bottom wall 13a is closed by the plate 14. A through hole 14h is formed in the central portion of the plate 14.

The compressor housing 15 is connected to the surface of the plate 14 opposite to the speed increaser housing 13. The compressor housing 15 is formed with a suction port 15a into which air as a fluid is sucked. The suction port 15a opens at the center of the end face of the compressor housing 15 opposite to the plate 14, and extends in the axial direction of the housing 11 from the center of the end face of the compressor housing 15 opposite to the plate 14. ..

A low-speed shaft 16 and an electric motor 17 for rotating the low-speed shaft 16 are housed in the motor housing 12. The electric motor 17 is housed in a motor accommodating chamber 12c partitioned by an inner surface of the bottom wall 12a of the motor housing 12, an inner peripheral surface of the peripheral wall 12b, and an outer surface of the bottom wall 13a of the speed increaser housing 13.

The low-speed shaft 16 is housed in the motor housing 12 in a state where the axial direction of the low-speed shaft 16 coincides with the axial direction of the motor housing 12. The low speed shaft 16 is made of a metal material made of, for example, iron or an alloy.

A tubular boss portion 12f projects from the inner surface of the bottom wall 12a of the motor housing 12. One end of the low speed shaft 16 is inserted into the boss portion 12f. A first bearing 18 is provided between one end of the low-speed shaft 16 and the boss portion 12f. One end of the low-speed shaft 16 is rotatably supported by the bottom wall 12a of the motor housing 12 via the first bearing 18.

The other end of the low speed shaft 16 is inserted into the through hole 13h. A second bearing 19 is provided between the other end of the low speed shaft 16 and the through hole 13h. The other end of the low-speed shaft 16 is rotatably supported by the bottom wall 13a of the speed increaser housing 13 via the second bearing 19. Therefore, the low speed shaft 16 is rotatably supported by the housing 11. The other end of the low speed shaft 16 projects from the motor accommodating chamber 12c through the through hole 13h into the speed increaser housing 13.

A sealing member 20 is provided between the other end of the low speed shaft 16 and the through hole 13h. The seal member 20 is arranged between the other end of the low-speed shaft 16 and the through hole 13h closer to the inner surface of the bottom wall 13a of the speed increaser housing 13 than the second bearing 19. The seal member 20 regulates the oil existing in the speed increaser housing 13 from flowing out to the motor accommodating chamber 12c.

The electric motor 17 has a tubular stator 21 and a rotor 22 arranged inside the stator 21. The rotor 22 is fixed to the low speed shaft 16 and rotates integrally with the low speed shaft 16. The stator 21 surrounds the rotor 22. The rotor 22 has a cylindrical rotor core 22a anchored to the low-speed shaft 16 and a plurality of permanent magnets (not shown) provided on the rotor core 22a. The stator 21 has a tubular stator core 21a fixed to the inner peripheral surface of the peripheral wall 12b of the motor housing 12, and a coil 21b wound around the stator core 21a. Then, when a current flows through the coil 21b, the rotor 22 and the low-speed shaft 16 rotate integrally.

The speed increaser 30 is housed in the speed increaser housing 13. The speed increaser 30 is housed in the inner surface of the bottom wall 13a of the speed increaser housing 13, the inner peripheral surface of the peripheral wall 13b, and the speed increaser accommodating chamber 13c partitioned by the plate 14.

A high-speed shaft 31 is housed in the speed increaser accommodating chamber 13c. The high speed shaft 31 is made of a metal material made of, for example, iron or an alloy. The high-speed shaft 31 is housed in the speed-up gear accommodation chamber 13c in a state where the axial direction of the high-speed shaft 31 coincides with the axial direction of the speed-up gear housing 13. The end of the high-speed shaft 31 opposite to the motor housing 12 passes through the through hole 14h of the plate 14 and projects into the compressor housing 15.

A sealing member 23 is provided between the high-speed shaft 31 and the through hole 14h. The seal member 23 regulates the oil existing in the speed increaser housing 13 from flowing out into the compressor housing 15.

In the compressor housing 15, an impeller chamber 15b is formed which is partitioned by the compressor housing 15 and the plate 14. The impeller chamber 15b and the suction port 15a are in communication with each other. The impeller chamber 15b has a substantially truncated cone shape in which the diameter gradually increases as the distance from the suction port 15a increases. The protruding end of the high-speed shaft 31 projecting into the compressor housing 15 projects into the impeller chamber 15b.

The impeller 24 is housed in the impeller chamber 15b. The impeller 24 has a tubular shape whose diameter is gradually reduced from the base end surface 24a toward the tip end surface 24b. The impeller 24 has an insertion hole 24c extending in the direction of the rotation axis of the impeller 24 and through which the high-speed shaft 31 can be inserted. The impeller 24 is attached to the high-speed shaft 31 so as to be rotatable integrally with the high-speed shaft 31 in a state where the protruding end portion of the high-speed shaft 31 protruding into the compressor housing 15 is inserted into the insertion hole 24c. As a result, the impeller 24 is rotated by the rotation of the high-speed shaft 31, and the air sucked from the suction port 15a is compressed.

Further, the centrifugal compressor 10 includes a diffuser flow path 25 into which air compressed by the impeller 24 flows in, and a discharge chamber 26 in which air that has passed through the diffuser flow path 25 flows in.

The diffuser flow path 25 is partitioned by a surface of the compressor housing 15 facing the plate 14 and a plate 14. The diffuser flow path 25 is located radially outside the high-speed shaft 31 with respect to the impeller chamber 15b and communicates with the impeller chamber 15b. The diffuser flow path 25 is formed in an annular shape surrounding the impeller 24 and the impeller chamber 15b.

The discharge chamber 26 is located radially outside the high-speed shaft 31 with respect to the diffuser flow path 25 and communicates with the diffuser flow path 25. The discharge chamber 26 is annular. The impeller chamber 15b and the discharge chamber 26 communicate with each other via the diffuser flow path 25. The air compressed by the impeller 24 is further compressed by passing through the diffuser flow path 25, flows into the discharge chamber 26, and is discharged from the discharge chamber 26.

The speed increaser 30 accelerates the rotation of the low speed shaft 16 and transmits the rotation to the high speed shaft 31. The speed increaser 30 is a so-called traction drive type (friction roller type). The speed increaser 30 includes a ring member 32 connected to the other end of the low speed shaft 16. The ring member 32 rotates with the rotation of the low speed shaft 16. The ring member 32 has a plate-shaped arm 33 and a cylindrical ring 34. The arm 33 is made of metal. The arm 33 is connected to the end of the low speed shaft 16 and rotates integrally with the low speed shaft 16.

The ring 34 is made of a flexible metal that can be elastically deformed. The ring 34 extends in the axial direction of the low speed shaft 16 with respect to the arm 33 toward the side opposite to the low speed shaft 16. The axis of the ring 34 coincides with the rotation axis of the low speed shaft 16. The ring 34 has a pair of insertion holes 61 into which the arm 33 is inserted. The pair of insertion holes 61 are formed at both portions located on both sides of the ring 34 in the radial direction. The pair of insertion holes 61 are through holes that penetrate in the thickness direction of the ring 34 at the end of the ring 34 on the arm 33 side. The pair of insertion holes 61 are arranged at positions 180 degrees apart from each other in the circumferential direction of the ring 34.

The arm 33 has an arm body 33a connected to the low speed shaft 16. The arm body 33a is formed with a hole 33h into which the other end of the low speed shaft 16 is press-fitted. The arm 33 is connected to the other end of the low speed shaft 16 by press-fitting the other end of the low speed shaft 16 into the hole 33h. Therefore, the hole 33h of the arm 33 is a connecting portion with the low speed shaft 16. Then, the arm 33 rotates integrally with the low speed shaft 16.

The arm 33 has a pair of insertion portions 71 that are inserted into the pair of insertion holes 61, respectively. Then, the arm 33 is engaged with the ring 34 by inserting the pair of insertion portions 71 into the pair of insertion holes 61, respectively. The ring 34 rotates integrally with the arm 33 by inserting the pair of insertion portions 71 of the arm 33 into the pair of insertion holes 61, respectively.

As shown in FIG. 2, a part of the high-speed shaft 31 is arranged inside the ring member 32. Further, the speed increaser 30 includes two fixed rollers 35 and 36 as rollers provided between the high-speed shaft 31 and the ring 34, and one movable roller 37. The two fixed rollers 35 and 36 and the movable roller 37 are made of metal, and are made of, for example, iron or an alloy of iron which is the same metal as the high-speed shaft 31. The two fixed rollers 35 and 36 and the movable roller 37 are arranged at predetermined intervals (for example, 120 degrees each) in the circumferential direction of the high-speed shaft 31.

As shown in FIGS. 1 and 2, the ring 34 has an annular convex portion 34f protruding from the inner peripheral surface 34a of the ring 34 toward the two fixed rollers 35 and 36 and the movable roller 37. The convex portion 34f has a semicircular cross section curved in an arc shape that is convex inward in the radial direction of the ring 34 with respect to the rotation axis direction of the ring 34. As shown in FIG. 2, the two fixed rollers 35 and 36 and the movable roller 37 abut on both the convex portion 34f of the ring 34 and the outer peripheral surface 31a of the high-speed shaft 31.

As shown in FIG. 3, the movable roller 37 includes a columnar roller portion 37a, a columnar first protrusion 37c protruding from the axial first end surface 37b of the roller portion 37a, and an axial direction of the roller portion 37a. It has a columnar second protrusion 37e protruding from the second end surface 37d. The axis of the roller portion 37a, the axis of the first protrusion 37c, and the axis of the second protrusion 37e are aligned.

Further, each of the fixed rollers 35, 36 includes a columnar roller portion 35a, 36a, a columnar first protrusion 35c, 36c protruding from the axial first end surfaces 35b, 36b of the roller portions 35a, 36a, and a roller. The portions 35a and 36a have columnar second protrusions 35e and 36e protruding from the second end faces 35d and 36d in the axial direction. The axes of the roller portions 35a and 36a, the axes of the first protrusions 35c and 36c, and the axes of the second protrusions 35e and 36e are aligned.

The outer diameters of the roller portions 35a and 36a of the two fixed rollers 35 and 36 and the outer diameters of the roller portions 37a of the movable roller 37 are larger than the outer diameter of the high-speed shaft 31. Further, the outer diameter of the roller portion 35a of the fixed roller 35 is larger than the outer diameter of the roller portion 36a of the fixed roller 36 and the outer diameter of the roller portion 37a of the movable roller 37. The outer diameter of the roller portion 36a of the fixed roller 36 and the outer diameter of the roller portion 37a of the movable roller 37 are the same.

The direction in which the axial centers of the roller portions 35a and 36a of the fixed rollers 35 and 36 extend (rotational axis direction), the direction in which the axial center of the roller portions 37a of the movable roller 37 extends (rotational axis direction), and the axial direction of the high-speed shaft 31. Are in agreement.

As shown in FIGS. 2 and 3, the speed increaser 30 includes a support member 39 that rotatably supports the two fixed rollers 35 and 36 and the movable roller 37 in cooperation with the plate 14. The support member 39 is arranged inside the ring 34. The support member 39 has a disc-shaped support base 40, and a columnar first standing wall 41, a second standing wall 42, and a third standing wall 43 erected from the support base 40. There is. The support base 40 is arranged to face the plate 14 in the direction of the rotation axis of the two fixed rollers 35 and 36 and the movable roller 37. The first erection wall 41, the second erection wall 42, and the third erection wall 43 extend from the surface 40a on the plate 14 side of the support base 40 toward the plate 14, respectively.

As shown in FIG. 2, the first standing wall 41 is arranged between two fixed rollers 35 and 36 adjacent to each other in the circumferential direction of the high-speed shaft 31. The first erection wall 41 includes a first outer surface 41a extending along the inner peripheral surface 34a of the ring 34, a second outer surface 41b extending along the outer peripheral surface 35f of the roller portion 35a of the fixed roller 35, and the fixed roller 36. It has a third outer surface 41c extending along the outer peripheral surface 36f of the roller portion 36a. Between the first outer surface 41a of the first standing wall 41 and the inner peripheral surface 34a of the ring 34, between the second outer surface 41b of the first standing wall 41 and the outer peripheral surface 35f of the fixed roller 35, and the first standing. A certain gap is formed between the third outer surface 41c of the wall 41 and the outer peripheral surface 36f of the fixed roller 36.

The second upright wall 42 is arranged between the fixed roller 36 and the movable roller 37 that are adjacent to each other in the circumferential direction of the high-speed shaft 31. The second upright wall 42 includes a first outer surface 42a extending along the inner peripheral surface 34a of the ring 34, a second outer surface 42b extending along the outer peripheral surface 36f of the roller portion 36a of the fixed roller 36, and a movable roller 37. It has a third outer surface 42c extending along the outer peripheral surface 37f of the roller portion 37a. It is constant between the first outer surface 42a of the second standing wall 42 and the inner peripheral surface 34a of the ring 34, and between the second outer surface 42b of the second standing wall 42 and the outer peripheral surface 36f of the fixed roller 36. A gap is formed.

The third upright wall 43 is arranged between the fixed rollers 35 and the movable rollers 37 that are adjacent to each other in the circumferential direction of the high-speed shaft 31. The third erection wall 43 includes a first outer surface 43a extending along the inner peripheral surface 34a of the ring 34, a second outer surface 43b extending along the outer peripheral surface 35f of the roller portion 35a of the fixed roller 35, and a movable roller 37. It has a third outer surface 43c extending along the outer peripheral surface 37f of the roller portion 37a. It is constant between the first outer surface 43a of the third erection wall 43 and the inner peripheral surface 34a of the ring 34, and between the second outer surface 43b of the third erection wall 43 and the outer peripheral surface 35f of the fixed roller 35. A gap is formed.

The support member 39 is formed with three screw insertion holes 45 through which the screws 44 can be inserted. Each screw insertion hole 45 penetrates the first standing wall 41, the second standing wall 42, and the third standing wall 43, respectively, in the direction of the rotation axis of the two fixed rollers 35, 36 and the movable roller 37. As shown in FIG. 1, a female screw hole 46 communicating with each screw insertion hole 45 is formed on the surface 14a of the plate 14 on the support member 39 side. The support member 39 is attached to the plate 14 by screwing each screw 44 inserted into each screw insertion hole 45 into each female screw hole 46.

As shown in FIG. 3, the surface 14a on the support member 39 side of the plate 14 has a first recess 51, a second recess 52, and a third recess 53. The first recess 51, the second recess 52, and the third recess 53 are arranged at predetermined intervals (for example, 120 degrees each) in the circumferential direction of the high-speed shaft 31. The placement positions of the first recess 51, the second recess 52, and the third recess 53 correspond to the placement positions of the two fixed rollers 35 and 36 and the movable roller 37, respectively.

An annular first roller bearing 54 is arranged in the first recess 51, the second recess 52, and the third recess 53. The first recess 51 and the second recess 52 have a circular shape when viewed from the axial direction of the high-speed shaft 31. The movement of the first roller bearing 54 arranged in the first recess 51 and the second recess 52 is restricted.

The third recess 53 has a shape in which an oval shape is curved in the circumferential direction of the high-speed shaft 31 when viewed from the axial direction of the high-speed shaft 31. In the third recess 53, the radial movement of the high-speed shaft 31 in the first roller bearing 54 is restricted. On the other hand, in the third recess 53, the movement of the high-speed shaft 31 in the first roller bearing 54 in the circumferential direction is permitted.

The surface 40a on the plate 14 side of the support base 40 has a first support recess 55, a second support recess 56, and a third support recess 57. When viewed from the axial direction of the high-speed shaft 31, the first support recess 55 has the same shape as the first recess 51, the second support recess 56 has the same shape as the second recess 52, and the third support recess 57 has the same shape as the second recess 52. It has the same shape as the three recesses 53.

The first support recess 55, the second support recess 56, and the third support recess 57 are arranged at predetermined intervals (for example, 120 degrees each) in the circumferential direction of the high-speed shaft 31. The placement positions of the first support recess 55, the second support recess 56, and the third support recess 57 correspond to the placement positions of the two fixed rollers 35, 36 and the movable roller 37, respectively.

An annular second roller bearing 58 is arranged in the first support recess 55, the second support recess 56, and the third support recess 57. The movement of the second roller bearing 58 arranged in the first support recess 55 and the second support recess 56 is restricted. In the third support recess 57, the radial movement of the high-speed shaft 31 in the second roller bearing 58 is restricted. On the other hand, in the third support recess 57, the high-speed shaft 31 of the second roller bearing 58 is allowed to move in the circumferential direction.

The first protrusion 35c of the fixed roller 35 is inserted into the first roller bearing 54 in the first recess 51, and is rotatably supported by the plate 14 via the first roller bearing 54. The second protrusion 35e of the fixed roller 35 is inserted into the second roller bearing 58 in the first support recess 55, and is rotatably supported by the support member 39 via the second roller bearing 58.

The first protrusion 36c of the fixed roller 36 is inserted into the first roller bearing 54 in the second recess 52, and is rotatably supported by the plate 14 via the first roller bearing 54. The second protrusion 36e of the fixed roller 36 is inserted into the second roller bearing 58 in the second support recess 56, and is rotatably supported by the support member 39 via the second roller bearing 58.

The first protrusion 37c of the movable roller 37 is inserted into the first roller bearing 54 in the third recess 53, and is rotatably supported by the plate 14 via the first roller bearing 54. The second protrusion 37e of the movable roller 37 is inserted into the second roller bearing 58 in the third support recess 57, and is rotatably supported by the support member 39 via the second roller bearing 58.

The fixed roller 35 is constant because it is supported by the first roller bearing 54 whose movement in the first recess 51 is restricted and the second roller bearing 58 whose movement in the first support recess 55 is restricted. Rotate in position. Similarly, the fixed roller 36 is also supported by the first roller bearing 54 whose movement in the second recess 52 is restricted and the second roller bearing 58 whose movement in the second support recess 56 is restricted. Therefore, it rotates at a fixed position.

In the movable roller 37, the first roller bearing 54, which is allowed to move the high-speed shaft 31 in the circumferential direction in the third recess 53, and the high-speed shaft 31 in the third support recess 57 can move in the circumferential direction. It is supported by the allowed second roller bearing 58. Therefore, the movable roller 37 can rotate while moving its position in the circumferential direction of the high-speed shaft 31 as the first roller bearing 54 and the second roller bearing 58 move. The movable roller 37 can move in the circumferential direction of the high-speed shaft 31 when the ring 34 rotates with the rotation of the low-speed shaft 16.

As shown in FIG. 1, the high-speed shaft 31 is provided with a pair of flange portions 31f arranged so as to be separated from each other in the axial direction of the high-speed shaft 31. The roller portions 35a and 36a of the two fixed rollers 35 and 36 and the roller portion 37a of the movable roller 37 are sandwiched by a pair of flange portions 31f. As a result, the misalignment between the high-speed shaft 31 and the roller portions 35a and 36a of the two fixed rollers 35 and 36 and the roller portion 37a of the movable roller 37 in the axial direction of the high-speed shaft 31 is suppressed.

As shown in FIG. 3, in the two fixed rollers 35, 36, the movable roller 37, the ring member 32, and the high-speed shaft 31, the two fixed rollers 35, 36 and the movable roller 37, and the high-speed shaft 31 and the ring 34 are connected to each other. It is unitized in a state of being pressed against each other. The high-speed shaft 31 is rotatably supported by two fixed rollers 35 and 36 and a movable roller 37.

As shown in FIG. 2, ring-side contact points Pa1, Pa2, Pa3, which are contact points between the outer peripheral surfaces 35f, 36f, 37f of the two fixed rollers 35, 36 and the movable roller 37 and the convex portion 34f of the ring 34. Is given a pressing load. Further, the two fixed rollers 35, 36 and the movable rollers 37 are pressed against the shaft-side contact points Pb1, Pb2, Pb3, which are the contact points between the outer peripheral surfaces 35f, 36f, 37f and the outer peripheral surfaces 31a of the high-speed shaft 31. A load is applied.

The ring-side contact point Pa1 is the contact point between the fixed roller 35 and the ring 34, and the ring-side contact point Pa2 is the contact point between the fixed roller 36 and the ring 34, and the ring-side contact point Pa3. Is the contact point between the movable roller 37 and the ring 34. The shaft-side contact point Pb1 is the contact point between the fixed roller 35 and the high-speed shaft 31, and the shaft-side contact point Pb2 is the contact point between the fixed roller 36 and the high-speed shaft 31. The portion Pb3 is a contact portion between the movable roller 37 and the high-speed shaft 31. The ring-side contact points Pa1, Pa2 and Pa3 and the shaft-side contact points Pb1, Pb2 and Pb3 extend in the axial direction of the high-speed shaft 31.

The outer diameter of the roller portion 35a of the fixed roller 35 is larger than the outer diameter of the roller portion 36a of the fixed roller 36 and the outer diameter of the roller portion 37a of the movable roller 37. Therefore, the distance from the ring-side contact point Pa1 to the shaft-side contact point Pb1 is the distance from the ring-side contact point Pa2 to the shaft-side contact point Pb2 and the distance from the ring-side contact point Pa3 to the shaft-side contact point. It is longer than the distance to Pb3. Therefore, the high-speed shaft 31 pressed and supported by the two fixed rollers 35 and 36 and the movable roller 37, and the ring 34 and the low-speed shaft 16 are eccentric. That is, the rotation axis of the high-speed shaft 31 and the rotation axis of the ring 34 are out of alignment.

Since the high-speed shaft 31 and the ring 34 are eccentric, the tangent line L1 having the ring-side contact portion Pa3 as a contact and the tangent line L2 having the shaft-side contact portion Pb3 as a contact intersect. The angle formed by the two tangents L1 and L2 has a wedge shape. Both tangents L1 and L2 approach each other toward a region surrounded by the outer peripheral surface 37f of the movable roller 37, the outer peripheral surface 36f of the fixed roller 36, and the inner peripheral surface 34a of the ring 34.

The movable roller 37 is in a direction approaching the intersection P of both tangents L1 and L2 (direction in which the movable roller 37 bites into the wedge) and a direction away from the intersection P of both tangents L1 and L2 (direction in which the movable roller 37 bites into the wedge). It is possible to move in the opposite direction). When the ring 34 is stopped, the movable roller 37 is located at the position farthest from the intersection P. That is, when the ring 34 is stopped, the movable roller 37 is closest to the third outer surface 43c of the third erection wall 43.

When the electric motor 17 is driven and the low-speed shaft 16 and the arm 33 rotate in the positive direction, the ring 34 rotates in the positive direction, which is the direction of the arrow R1 shown in FIG. Then, a force acts on the movable roller 37 in the direction approaching the intersection P of both tangents L1 and L2. This force increases as the torque of the electric motor 17 increases. Therefore, the larger the torque of the electric motor 17, the more the movable roller 37 moves in the direction closer to the intersection P, as shown by the alternate long and short dash line in FIG. That is, the movable roller 37 moves from the third outer surface 43c side of the third erection wall 43 toward the third outer surface 42c of the second erection wall 42 in the circumferential direction of the high-speed shaft 31.

Then, the tightening allowance between the convex portion 34f of the ring 34 and the outer peripheral surface 31a of the high-speed shaft 31 in the movable roller 37 increases, and the high-speed shaft 31, the two fixed rollers 35, 36, and the movable roller 37 by the ring 34 are reached. Since the tightening force of the low speed shaft 16 is increased, the power from the low speed shaft 16 is easily transmitted to the high speed shaft 31. The greater the torque of the electric motor 17, the greater the force that the movable roller 37 receives from the ring 34 and the high-speed shaft 31.

Then, the rotational force of the two fixed rollers 35, 36 and the movable roller 37 is between the outer peripheral surfaces 31a of the high-speed shaft 31 and the outer peripheral surfaces 35f, 36f, 37f of the two fixed rollers 35, 36 and the movable roller 37. It is transmitted to the high-speed shaft 31 via the formed oil film, and as a result, the high-speed shaft 31 rotates. In this case, the ring 34 rotates at the same speed as the low speed shaft 16, and the two fixed rollers 35 and 36 and the movable roller 37 rotate at a higher speed than the low speed shaft 16. Further, the high-speed shaft 31, whose outer diameter is smaller than the outer diameters of the two fixed rollers 35, 36 and the movable roller 37, rotates at a higher speed than the two fixed rollers 35, 36 and the movable roller 37. From the above, the speed increaser 30 causes the high-speed shaft 31 to rotate at a higher speed than the low-speed shaft 16. The speed increaser 30 of the present embodiment is a friction roller type that transmits the power of the low speed shaft 16 to the high speed shaft 31 by using a wedge action.

As shown in FIG. 4, the arm main body 33a of the arm 33 has an elongated flat plate shape. The hole 33h is formed in the central portion of the arm main body portion 33a in the longitudinal direction. The hole 33h penetrates the arm main body 33a in the plate thickness direction. The arm body 33a extends in the radial direction of the low speed shaft 16 with respect to the low speed shaft 16.

Both long side edges 33b located in the lateral direction of the arm main body 33a extend in parallel with each other. Both short side edges 33c located in the longitudinal direction of the arm main body 33a extend in an arcuately curved state so as to be convex in the direction away from each other when the arm main body 33a is viewed from the plate thickness direction. When the arm body 33a is viewed from the plate thickness direction, the corners 33d located at the four corners of the arm body 33a are curved in an arc shape so as to be recessed toward the hole 33h. Each corner portion 33d connects each long side edge 33b and each short side edge 33c, respectively. The distance between the two short side edges 33c in the longitudinal direction of the arm body 33a is smaller than the inner diameter of the ring 34.

Each insertion portion 71 extends from each short side edge 33c. Each insertion portion 71 has a thin plate shape. The pair of insertion portions 71 extend from each short side edge 33c in a direction opposite to the low speed shaft 16 in a direction away from each other. The tip of each insertion portion 71 has an elongated thin plate shape along the inner peripheral surface of each insertion hole 61. The tip of each insertion portion 71 is located on the side opposite to the low speed shaft 16 with respect to the arm main body 33a in the plate thickness direction of the arm main body 33a.

As shown in FIGS. 4 and 5, when the ring 34 is viewed from the axial direction of the low-speed shaft 16, the direction in which the straight line L10 connecting the pair of insertion holes 61 extends is defined as the first direction X1, and is in the radial direction of the ring 34. The direction orthogonal to the first direction X1 is defined as the second direction X2. The edge 34e on the low speed shaft 16 side of the ring 34 has a specific portion. In the present embodiment, the specific portion of the edge 34e of the ring 34 is a portion of the edge 34e of the ring 34 located on both sides of the first direction X1. Therefore, the pair of insertion holes 61 are formed in the ring 34 on the axial extension of the low speed shaft 16 at a specific portion at the end edge 34e of the ring 34. Both portions of the edge 34e of the ring 34 located on both sides of the second direction X2 are portions deviating from the specific portion of the edge 34e of the ring 34.

The arm 33 has a pair of elongated thin plate-shaped opposed surfaces extending from the arm body 33a to positions facing both portions located on both sides of the second direction X2 at the end edge 34e on the low speed shaft 16 side of the ring 34. A member 72 is provided. Therefore, the pair of opposing members 72 are connected to the low speed shaft 16 via the arm 33. Each of the opposing members 72 extends from each of the long side edges 33b of the arm main body 33a. When the arm 33 is viewed from the plate thickness direction, the pair of opposing members 72 extend in the second direction X2 from the portions on both sides of the both long side edges 33b sandwiching the hole 33h. The longitudinal direction of each facing member 72 coincides with the second direction X2.

The tip end portion of each of the opposing members 72 is an opposing portion 72a that faces the end edge 34e of the ring 34 in the axial direction of the ring 34. Therefore, the arm 33 has a pair of facing portions 72a facing both portions located on both sides of the second direction X2 at the end edge 34e on the low speed shaft 16 side of the ring 34. The facing portions 72a are located closer to the low-speed shaft 16 than the tip portions of the insertion portions 71 in the axial direction of the ring 34. Therefore, each of the opposing members 72 extends from the arm main body 33a so that the tip of each inserting portion 71 is arranged at a position deviated from each of the opposing members 72 in the axial direction of the ring 34. When viewed from the axial direction of the low-speed shaft 16, the tip edges of the opposing members 72 extend along the outer peripheral surface of the ring 34.

As shown in FIGS. 6 and 7, accommodating recesses 72b are formed in the pair of facing portions 72a, respectively. Each accommodating recess 72b has an elliptical shape in a plan view. A rubber member 73, which is an elastic member, is accommodated in each accommodating recess 72b. As shown in FIG. 7, each rubber member 73 is accommodated in each accommodating recess 72b in a state where a part of each rubber member 73 protrudes from the surface of the ring 34 on the end edge 34e side of each facing portion 72a. That is, a part of each rubber member 73 protrudes from each accommodating recess 72b.

As shown in FIG. 8, a part of the end edge 34e on the low speed shaft 16 side of the ring 34 is a ring recess 34g. The ring recesses 34g are provided at the end edges 34e on the low speed shaft 16 side of the ring 34, one at each of the two portions located on both sides of the second direction X2. Each ring recess 34g penetrates the ring 34 in the radial direction. Each ring recess 34g faces each other with each of the housing recesses 72b.

Each ring recess 34g accommodates a portion of each rubber member 73 that protrudes from each accommodation recess 72b. The portion of each rubber member 73 protruding from each accommodating recess 72b is in contact with each ring recess 34g. Therefore, each rubber member 73 is interposed between the pair of facing portions 72a and the end edge 34e on the low speed shaft 16 side of the ring 34, respectively.

Each rubber member 73 is crushed between each accommodating recess 72b and each ring recess 34g to give a preload. Then, each rubber member 73 is separated from the pair of facing portions 72a by a returning force that tries to return to the original shape before being crushed between each accommodating recess 72b and each ring recess 34g. I'm urging. Therefore, each opposing member 72 provided with each rubber member 73 constitutes an urging member that urges the ring 34 together with each rubber member 73. Each rubber member 73 is an elastic member interposed between each opposing member 72 and the end edge 34e of the ring 34. The urging member is provided on the edge 34e of the ring 34, which is connected to the low-speed shaft 16 and faces the edge 34e of the ring 34, which is separated from the specific portion.

As shown in FIG. 9, each insertion hole 61 has an elongated hole shape whose longitudinal direction extends in the circumferential direction of the ring 34. The inner peripheral surface of each insertion hole 61 is formed of a pair of insertion hole planes 61a and a pair of insertion hole arc surfaces 61b. The pair of insertion hole planes 61a extend in the circumferential direction of the ring 34. The pair of insertion hole arc surfaces 61b are located on both sides in the longitudinal direction, connect the pair of insertion hole planes 61a to each other, and extend in an arc shape so as to be recessed in the circumferential direction of the ring 34 so as to be separated from each other.

The outer surface of the tip of each insertion portion 71 connects the pair of insertion portion planes 71a extending along the pair of insertion hole planes 61a and the pair of insertion portion planes 71a to each other, and forms the pair of insertion hole arc surfaces 61b. It is formed of a pair of insertion portion arc planes 71b extending along the respective insertion portions. Therefore, the outer surface of the tip of each insertion portion 71 extends along the inner peripheral surface of each insertion hole 61.

Next, the operation of this embodiment will be described.
In order to insert the pair of insertion portions 71 into the pair of insertion holes 61, a certain amount of gap is required between the insertion portions 71 and the insertion holes 61. Here, the ring 34 is urged in a direction away from the pair of facing portions 72a by the urging force of each rubber member 73, so that each insertion portion 71 is on the low speed shaft 16 side of the pair of insertion portion planes 71a. The insertion portion plane 71a located in is maintained in a state of being in contact with the insertion hole plane 61a located on the low speed shaft 16 side of the pair of insertion hole planes 61a. That is, the ring 34 is urged by each rubber member 73, and the insertion holes 61 and the insertion portions 71 are maintained in contact with each other.

Then, when the arm 33 rotates in the direction of the arrow R1 shown in FIG. 5 in a state where the pair of insertion portions 71 are inserted into the pair of insertion holes 61, each insertion portion 71 has an inner circumference of each insertion hole 61. It is pressed against a portion of the surface located in the direction of rotation of the arm 33. Here, since the torque of the electric motor 17 is relatively large during high-speed rotation, even if the torque fluctuates and the torque becomes small, each insertion portion 71 of the arm 33 on the inner peripheral surface of each insertion hole 61 The state of being pressed against the part located in the rotation direction is maintained.

On the other hand, at low speed rotation, the torque of the electric motor 17 is smaller than at high speed rotation. Therefore, when torque fluctuates and the torque decreases during low-speed rotation, each insertion portion 71 moves so as to be separated from a portion of the inner peripheral surface of each insertion hole 61 that is located in the rotation direction of the arm 33. try to. At this time, as shown in FIG. 10A, each insertion portion 71 has an insertion portion plane 71a located on the low speed shaft 16 side of the pair of insertion portion planes 71a, and the low speed shaft of the pair of insertion hole planes 61a. It moves while abutting on the insertion hole plane 61a located on the 16 side. That is, each insertion portion 71 moves while abutting on a portion located on the inner peripheral surface of each insertion hole 61 on the low speed shaft 16 side in the axial direction of the low speed shaft 16.

The insertion portion arc surface 71b located in the direction opposite to the rotation direction of the arm 33 of the pair of insertion portion arc surfaces 71b is located in the direction opposite to the rotation direction of the arm 33 of the pair of insertion hole arc surfaces 61b. The contact is made so as to follow the arc surface 61b of the insertion hole. Therefore, the impact force when each insertion portion 71 collides with a portion located on the inner peripheral surface of each insertion hole 61 in the direction opposite to the rotation direction of the arm 33 is easily relaxed.

Further, when the torque fluctuates and the torque increases during low-speed rotation, each insertion portion 71 is separated from a portion located on the inner peripheral surface of each insertion hole 61 in a direction opposite to the rotation direction of the arm 33. Try to move like. Also at this time, in each insertion portion 71, the insertion portion plane 71a located on the low speed shaft 16 side of the pair of insertion portion planes 71a is located on the low speed shaft 16 side of the pair of insertion hole planes 61a. Move while contacting.

Then, as shown in FIG. 10B, the insertion portion arc surface 71b located in the rotation direction of the arm 33 of the pair of insertion portion arc surfaces 71b is located in the rotation direction of the arm 33 of the pair of insertion hole arc surfaces 61b. The contact is made so as to follow the arcuate surface 61b of the insertion hole located. Therefore, the impact force when each insertion portion 71 collides with a portion located in the rotation direction of the arm 33 on the inner peripheral surface of each insertion hole 61 is easily relaxed. Therefore, each rubber member 73 urges the ring 34 to bring each insertion hole 61 into contact with each insertion portion 71, thereby alleviating the impact between the arm 33 and the ring 34 due to torque fluctuation.

In the above embodiment, the following effects can be obtained.
(1) The ring 34 is urged by each rubber member 73, and the insertion holes 61 and the insertion portions 71 are maintained in contact with each other. Here, for example, at low speed rotation, torque fluctuation occurs and the torque becomes small, and each insertion portion 71 moves so as to be separated from a portion of the inner peripheral surface of each insertion hole 61 located in the rotation direction of the arm 33. Consider the case of doing. In this case, each insertion portion 71 moves while abutting on a portion located on the inner peripheral surface of each insertion hole 61 on the low speed shaft 16 side in the axial direction of the low speed shaft 16. Further, for example, during low-speed rotation, torque fluctuations occur and the torque increases, so that each insertion portion 71 is separated from a portion located on the inner peripheral surface of each insertion hole 61 in a direction opposite to the rotation direction of the arm 33. Consider the case of moving like this. Also in this case, each insertion portion 71 moves while abutting on a portion located on the inner peripheral surface of each insertion hole 61 on the low speed shaft 16 side in the axial direction of the low speed shaft 16. Therefore, as the torque fluctuates during low-speed rotation, each insertion portion 71 is located on the inner peripheral surface of each insertion hole 61 at a portion located in the rotation direction of the arm 33 and in a direction opposite to the rotation direction of the arm 33. The impact force when repeatedly colliding with both parts is relaxed. As a result, the generation of abnormal noise can be suppressed.

(2) Each insertion hole 61 has an elongated hole shape whose longitudinal direction extends in the circumferential direction of the ring 34, and the outer surface of each insertion portion 71 extends along the inner peripheral surface of each insertion hole 61. According to this, for example, as compared with the case where each insertion hole 61 has a perfect circular shape and the outer surface of each insertion portion 71 extends along the inner peripheral surface of each perfect circular insertion hole 61, the ring It is possible to prevent the 34 from tilting with respect to the arm 33 so that both portions located on both sides in the second direction rotate about the straight line L10 connecting the pair of insertion holes 61.

(3) For example, when torque fluctuates and the torque becomes small during low-speed rotation, each insertion portion 71 moves so as to be separated from a portion of the inner peripheral surface of each insertion hole 61 that is located in the rotation direction of the arm 33. .. The insertion portion arc surface 71b located in the direction opposite to the rotation direction of the arm 33 of the pair of insertion portion arc surfaces 71b is located in the direction opposite to the rotation direction of the arm 33 of the pair of insertion hole arc surfaces 61b. The contact is made so as to follow the arc surface 61b of the insertion hole. Therefore, the impact force when each insertion portion 71 collides with a portion located on the inner peripheral surface of each insertion hole 61 in the direction opposite to the rotation direction of the arm 33 is easily relaxed.

Further, for example, when torque fluctuates and the torque increases during low-speed rotation, each insertion portion 71 is separated from a portion located on the inner peripheral surface of each insertion hole 61 in a direction opposite to the rotation direction of the arm 33. Move to. Then, the insertion portion arc surface 71b located in the rotation direction of the arm 33 of the pair of insertion portion arc surfaces 71b follows the insertion hole arc surface 61b located in the rotation direction of the arm 33 of the pair of insertion hole arc surfaces 61b. Contact. Therefore, the impact force when each insertion portion 71 collides with a portion located in the rotation direction of the arm 33 on the inner peripheral surface of each insertion hole 61 is easily relaxed.

Therefore, as the torque fluctuates during low-speed rotation, each insertion portion 71 is located on the inner peripheral surface of each insertion hole 61 at a portion located in the rotation direction of the arm 33 and in a direction opposite to the rotation direction of the arm 33. The impact force when repeatedly colliding with both of the parts to be subjected to is easily relaxed. As a result, it is possible to further suppress the generation of abnormal noise.

(4) The pair of facing members 72 have a plate shape extending in the second direction X2 and connected to the arm 33, and each rubber member 73 has a pair of facing members 72 and an end edge 34e of the ring 34. It is intervened between them. Such the opposing member 72 and the rubber member 73 are provided at the edge 34e of the edge 34e on the low speed shaft 16 side of the ring 34, which is separated from the specific portion, and are connected to the low speed shaft 16 and at the low speed of the ring 34. It is suitable as an urging member facing the end edge 34e on the shaft 16 side.

(5) The pair of facing portions 72a are formed with accommodating recesses 72b for accommodating each rubber member 73. According to this, by accommodating each rubber member 73 in each accommodating recess 72b, each rubber member 73 can be positioned with respect to each opposing member 72, so that each insertion portion 71 is inserted into each insertion hole 61. Workability can be improved.

(6) A part of the end edge 34e on the low speed shaft 16 side of the ring 34 is a ring recess 34g that accommodates each rubber member 73. According to this, each rubber member 73 can be positioned with respect to each facing member 72 by accommodating each rubber member 73 in each ring recess 34g. Therefore, in order to position each rubber member 73, for example, even when the accommodating recesses 72b are formed in the pair of facing members 72, the depth of the accommodating recesses 72b can be minimized. The thickness of the opposing members 72 can be made as thick as possible, and the rigidity of each opposing member 72 can be easily ensured. Further, the thickness of each rubber member 73 can be made as thick as possible.

(7) The rubber member 73 is interposed between the pair of opposing members 72 and the end edge 34e on the low-speed shaft 16 side of the ring 34, and urges the ring 34 to urge each insertion hole 61 and each insertion portion. It is suitable as an elastic member that abuts 71 and forms a part of an urging member for alleviating the impact between the arm 33 and the ring 34 due to torque fluctuation.

(8) Since the arm 33 is engaged with the ring 34 by inserting the pair of insertion portions 71 into the pair of insertion holes 61, respectively, it is possible to prevent the ring 34 from coming off in the axial direction with respect to the ring 34 in the arm 33. It is not necessary to use a retaining ring as in the prior art to do this. Therefore, the number of parts can be reduced.

(9) The rubber member 73 is provided so as to avoid an engagement portion (a specific portion where the insertion hole 61 exists on the extension) between the arm 33 and the ring 34, which is a portion for transmitting torque. The engagement portion between the arm 33 and the ring 34 needs to have strength for torque transmission and engagement holding, and a hole is machined so as to insert the rubber member 73 or the thickness of the arm 33 is changed. There are restrictions on the above. Further, if a rubber member is provided between the insertion hole 61 and the insertion portion 71, there is only a small gap when the insertion portion 71 is inserted into the insertion hole 61, and high accuracy is required for assembly. Therefore, by providing the rubber member 73 while avoiding such a specific portion, it is possible to assemble the arm 33 and the ring 34 while ensuring the degree of freedom in design without impairing the torque transmission and the engagement holding. is there.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

◯ In the embodiment, each insertion hole 61 may have an elongated trapezoidal shape whose longitudinal direction extends in the circumferential direction of the ring 34, for example. In this case, the outer surface of the tip of each insertion portion 71 extends along the inner peripheral surface of each of the elongated trapezoidal insertion holes 61, and the tip of each insertion portion 71 has a trapezoidal thin plate shape. The inner peripheral surface of each insertion hole 61 is composed of a pair of insertion hole planes 61a and a pair of insertion hole inclined surfaces that are located on both sides in the longitudinal direction and connect the pair of insertion hole planes 61a to each other. .. Each of the insertion hole inclined surfaces extends in a direction in which they are separated from each other as they are separated from the insertion hole plane 61a located on the low speed shaft 16 side of the pair of insertion hole planes 61a.

○ In the embodiment, each insertion hole 61 does not have to have an elongated hole shape whose longitudinal direction extends in the circumferential direction of the ring 34, and may be, for example, a perfect circle shape. Then, the outer surface of each insertion portion 71 may extend along the inner peripheral surface of each perfectly circular insertion hole 61. In short, the shapes of the pair of insertion holes 61 and the pair of insertion portions 71 are not particularly limited as long as the pair of insertion portions 71 can be inserted into the pair of insertion holes 61.

○ In the embodiment, a part of the end edge 34e on the low speed shaft 16 side of the ring 34 does not have to be the ring recess 34g that accommodates each rubber member 73.
○ In the embodiment, the accommodating recesses 72b may not be formed in the pair of facing portions 72a, respectively. In this case, each rubber member 73 is housed in each ring recess 34g.

○ In the embodiment, a part of the end edge 34e on the low speed shaft 16 side of the ring 34 is not a ring recess 34g for accommodating each rubber member 73, and further, the accommodating recess 72b is provided in each of the pair of facing portions 72a. It does not have to be formed. In this case, each rubber member 73 is attached to, for example, a surface of each facing portion 72a on the end edge 34e side of the ring 34.

○ In the embodiment, an elastic member is interposed between the pair of facing portions 72a and the end edge 34e on the low speed shaft 16 side of the ring 34, and urges the ring 34 in a direction away from the pair of facing portions 72a. For example, a coil spring may be used.

O In the embodiment, the pair of opposing members 72 may be separate from the arm 33. In short, the pair of opposing members 72 may be configured to be connected to the low speed shaft 16.
○ In the embodiment, the pair of opposing members 72 themselves may be configured to urge the ring 34 as a leaf spring. In this case, each rubber member 73 may be deleted.

○ In the embodiment, assuming that the direction diagonally intersecting with the first direction X1 in the radial direction of the ring 34 is the second direction, the pair of opposing members 72 are arranged so that the longitudinal directions of the pair of opposing members 72 coincide with the second direction. May extend from the arm body 33a, respectively. In short, the direction in which the ring 34 intersects the first direction X1 in the radial direction is the second direction, and a pair of facing portions 72a are provided on both sides of the second direction X2 at the end edge 34e on the low speed shaft 16 side of the ring 34. A pair of facing members 72 may extend from the arm main body 33a so as to face both of the positioned portions.

○ In the embodiment, the speed increaser 30 may have a configuration in which a fixed roller is used as a roller instead of the movable roller 37, for example. That is, all the rollers may be fixed rollers. Further, the number of rollers is not particularly limited.

○ In the embodiment, the target of mounting the speed increaser 30 is not limited to the centrifugal compressor 10, but is arbitrary. Further, the speed increaser 30 may be mounted on a vehicle other than the fuel cell vehicle.
○ In the embodiment, the application target of the centrifugal compressor 10 and the fluid to be compressed are arbitrary. For example, the centrifugal compressor 10 may be used in an air conditioner, and the fluid to be compressed may be a refrigerant. Further, the target of mounting the centrifugal compressor 10 is not limited to the vehicle and is arbitrary.

16 ... Low speed shaft, 30 ... Speed increaser, 31 ... High speed shaft, 33 ... Arm, 34 ... Ring, 34e ... Edge edge, 34g ... Ring recess, 35, 36 ... Fixed roller as rotor, 37 ... Movable as rotor Roller, 61 ... Insertion hole, 61a ... Insertion hole plane, 61b ... Insertion hole arc surface, 71 ... Insertion part, 71a ... Insertion part plane, 71b ... Insertion part arc surface, 72 ... Opposing member constituting an urging member, 72b ... Containment recess, 73 ... A rubber member that constitutes an urging member and is an elastic member.

Claims (7)

A plate-shaped arm that is connected to the end of the low-speed shaft and rotates integrally with the low-speed shaft.
A tubular ring extending in the axial direction of the low speed shaft toward the side opposite to the low speed shaft with respect to the arm.
A roller provided between the high-speed shaft arranged inside the ring and the ring and in contact with both the ring and the high-speed shaft is provided.
The ring has a pair of insertion holes into which the arm is inserted.
The arm has a pair of insertion portions, each of which is inserted into the pair of insertion holes.
A speed increasing machine in which the arm is engaged with the ring by inserting the pair of insertion portions into the pair of insertion holes, and the power from the low speed shaft is transmitted to the high speed shaft.
The edge of the ring on the low speed shaft side has a specific portion, and the pair of insertion holes are formed on the extension of the specific portion in the axial direction.
An urging member connected to the low-speed shaft and facing the edge is provided on the edge deviated from the specific portion.
A speed increasing machine characterized in that the ring is urged by the urging member to bring the insertion hole and the insertion portion into contact with each other to alleviate the impact between the arm and the ring due to torque fluctuation. Each of the insertion holes has an elongated shape whose longitudinal direction extends in the circumferential direction of the ring.
The speed increaser according to claim 1, wherein the outer surface of each insertion portion extends along the inner peripheral surface of each insertion hole. The inner peripheral surfaces of the respective insertion holes are located on both sides of the pair of insertion hole planes extending in the circumferential direction of the ring and both sides in the longitudinal direction, connect the pair of insertion hole planes to each other, and are peripheral to the ring. It is formed of a pair of insertion hole arc planes extending in an arc shape so as to be recessed in a direction away from each other in the direction.
The outer surface of each insertion portion connects the pair of insertion portion planes extending along the pair of insertion hole planes and the pair of insertion portion planes, and extends along the pair of insertion hole arc planes. The speed increaser according to claim 2, wherein the speed increasing machine is formed of a pair of arc planes of insertion portions. Assuming that the direction in which the straight line connecting the pair of insertion holes extends is the first direction and the direction in which the ring intersects the first direction in the radial direction of the ring is the second direction.
The urging member comprises a plate-shaped facing member connected to the arm and an elastic member interposed between the facing member and the end edge while extending in the second direction. The speed increaser according to any one of claims 1 to 3, wherein the speed increasing machine is characterized. The speed increaser according to claim 4, wherein the facing member is formed with an accommodating recess for accommodating the elastic member. The speed increaser according to claim 4 or 5, wherein a part of the end edge of the ring on the low-speed shaft side is a ring recess for accommodating the elastic member. The speed increaser according to any one of claims 4 to 6, wherein the elastic member is a rubber member.