JP2020148303A - clutch - Google Patents

Abstract

To provide a clutch capable of suppressing damage of a support rod.SOLUTION: A clutch comprises: a first member that has a first hole formed on a first surface intersecting an axial line, and rotates around the axial line; a second member that has a second hole formed on a second surface facing the first surface in an axial direction, and rotates around the axial line; a support rod that is arranged in the first hole, and swings between a first position where the support rod can be engaged with the first hole and the second hole and a second position where the engagement with the second hole is disengaged; and hydraulic oil that exerts the force for placing the support rod at the second position on the support rod.SELECTED DRAWING: Figure 1

Description

The present invention relates to a clutch that switches between torque transmission and interruption.

A first member having a first surface intersecting the axis and rotating about the axis, a second member having a second surface facing the first surface in the direction of the axis and rotating about the axis, and a first member. A clutch including an engaging piece interposed between a member and a second member is known (Patent Document 1). The engaging piece is formed in a T shape in which the arm protrudes from the end of the strut, and is arranged in the first hole formed on the first surface. The engaging piece is placed in a state in which the support column can be engaged with the second hole and the first hole formed on the second surface by the elastic force of the spring arranged in the first hole.

When the first member and the second member rotate relative to each other in the direction opposite to the direction in which the strut can engage with the second hole (hereinafter referred to as "overrun"), the elastic force of the spring causes the engaging piece to be centered on the arm. It swings and the column repeatedly collides with the second member. When the edge of the strut collides with the second hole, the engaging piece is twisted and a tearing force is easily applied between the arm and the strut, so that the strut may be damaged. In order to prevent this, in Patent Document 1, by changing the shape of the support column and the second hole, twisting of the support column is prevented and damage to the support column is suppressed.

JP-A-2018-71586

However, in the above technique, since the support column repeatedly collides with the second member at the time of overrun, the possibility that the support column is damaged cannot be eliminated.

The present invention has been made to solve this problem, and an object of the present invention is to provide a clutch capable of suppressing damage to a strut.

In order to achieve this object, the clutch of the present invention has a first member having a first hole formed on a first surface intersecting the axis and rotating around the axis, and a second member facing the first surface in the direction of the axis. The engagement between the second member, which has a second hole formed on the surface and rotates about the axis, and the first position and the second hole, which are arranged in the first hole and can engage with the first hole and the second hole, It includes a strut that swings between the second positions to be released, and hydraulic oil that exerts a force on the strut to place the strut at the second position.

According to the clutch according to claim 1, when the hydraulic oil exerts a force on the strut to place the strut at the second position where the engagement between the second hole and the strut is disengaged, the second member also occurs during overrun. It is possible to prevent the columns from colliding with each other. Therefore, damage to the columns can be suppressed.

According to the clutch according to claim 2, the second hole is a blind hole, and a second flow path through which hydraulic oil flows is formed in the second member between the bottom of the second hole and the support column. As a result, in addition to the effect of claim 1, the engagement between the second hole and the support can be released by the hydraulic oil flowing from the second flow path.

According to the clutch according to claim 3, the hydraulic oil that has flowed into the first chamber including the gap between the first surface and the second surface exerts a force on the support column and flows into the second chamber. As a result, the stanchion can be placed in the second position by the kinetic energy of the hydraulic oil flowing from the first chamber to the second chamber. Therefore, in addition to the effect of claim 1 or 2, the structure of the seal or the like can be simplified as compared with the case where the support column is placed in the second position by the pressure of the hydraulic oil.

According to the clutch according to claim 4, the first hole is a blind hole, and a first flow path through which hydraulic oil flows is formed in the first member between the bottom of the first hole and the support column. Thereby, in addition to the effect of any one of claims 1 to 3, the column can be placed in the first position by the hydraulic oil flowing from the first flow path.

It is a piping system diagram of the clutch in 1st Embodiment. (A) is a cross-sectional view of a clutch in which the strut is in the second position, and (b) is a cross-sectional view of the clutch in which the strut is in the first position. It is sectional drawing of the clutch in line III-III of FIG. 2A. It is a piping system diagram of the clutch in 2nd Embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The clutch 10 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a piping system diagram of the clutch 10 according to the first embodiment. In FIG. 1, the end portions of the drive shaft 11 and the driven shaft 12 in the longitudinal direction are not shown.

As shown in FIG. 1, the clutch 10 includes a first member 20 and a second member 30 that rotate about the axis O. In the present embodiment, the second member 30 is coupled to the drive shaft 11, and the first member 20 is coupled to the driven shaft 12. The drive shaft 11 and the driven shaft 12 are arranged on the axis O so as to be rotatable relative to each other.

The first member 20 is a member formed in a disk shape centered on the axis O. A first hole 22 is formed on the first surface 21 of the first member 20 that intersects the axis O. The first hole 22 is a blind hole having a bottom 23. The bottom 23 is a surface facing the second member 30 side and is perpendicular to the axis O. The first member 20 is formed with a first flow path 24 that opens to the bottom 23.

The second member 30 is a member formed in a disk shape centered on the axis O. A second hole 32 is formed on the second surface 31 of the second member 30 that intersects the axis O. The second surface 31 faces the first surface 21 of the first member 20 in the O-axis direction. The first surface 21 and the second surface 31 are formed in a flat surface shape. The second hole 32 is a blind hole having a bottom 33. The bottom 33 is a surface facing the first member 20 side and is perpendicular to the axis O. The second member 30 is formed with a second flow path 34 that opens to the bottom 33.

A support column 41 is arranged in the first hole 22 of the first member 20. When the support column 41 engages with the first hole 22 and the second hole 32, the first member 20 and the second member 30 rotate integrally via the support column 41, so that the first member 20 and the second member 30 Torque is transmitted between. The first member 20 and the second member 30 are arranged in the first chamber 51, the second chamber 52, and the third chamber 53. Hydraulic oil is contained in the first chamber 51, the second chamber 52, and the third chamber 53. The first chamber 51, the second chamber 52, and the third chamber 53 are fixed so as not to rotate about the axis O.

The first chamber 51 is a space including a gap 50 between the first surface 21 of the first member 20 and the second surface 31 of the second member 30 facing each other. The second chamber 52 is a space for accommodating a part of the driven shaft 12 and the first member 20. The third chamber 53 is a space for accommodating a part of the drive shaft 11 and the second member 30. The first flow path 24 communicates with the first chamber 51 and the second chamber 52. The second flow path 34 communicates between the first chamber 51 and the third chamber 53. In order to prevent the hydraulic oil in the first chamber 51, the second chamber 52, and the third chamber 53 from leaking, on the outer periphery of the rotating drive shaft 11, the driven shaft 12, the first member 20, and the second member 30. An oil seal is placed.

A first oil passage 54 in which a flow control valve (not shown) is arranged is connected to the second chamber 52, and a second oil passage 55 is connected to the third chamber 53. The hydraulic pressure generator 58 includes a hydraulic pump 59 and a drive source 60 such as a motor or an engine that drives the hydraulic pump 59. When the hydraulic pressure generator 58 is driven, the hydraulic oil contained in the oil tank 56 is sent to the directional control valve 61 through the filter 57, and the first oil passage 54 or the second oil passage is switched by switching the directional control valve 61. Sent to 55. The pressure control valve 62 controls the pressure in the first oil passage 54 and the second oil passage 55.

FIG. 2A is a cross-sectional view of the clutch 10 in which the support column 41 is in the second position (position where it cannot be engaged), and FIG. 2B is a cross-sectional view of the clutch 10 in which the support column 41 is in the first position (position where it can be engaged). It is a cross-sectional view of. FIG. 3 is a cross-sectional view of the clutch 10 in line III-III of FIG. 2 (a). Arrows R1 shown in FIGS. 2A, 2B and 3 indicate the rotation direction of the first member 20, arrow R2 indicates the rotation direction of the second member 30, and arrow F indicates the flow of hydraulic oil. Shown.

As shown in FIG. 3, the first hole 22 is a rectangular recess having a width W in the radial direction (vertical direction in FIG. 3) of the first member 20 when viewed from the axis O direction. A plurality of first holes 22 are formed on the circumference of a radius R centered on the axis O of the first surface 21. The engaging piece 40 includes a rectangular plate-shaped strut 41, two arms 42 extending from the first end 41a of the strut 41 located in the rotational direction of the first member 20 to both sides in the radial direction of the first member 20. It has. A recess 26 connected to the first hole 22 is formed on the first surface 21. The recess 26 is a recess extending from the first end 22a of the first member 20 of the first hole 22 in the rotational direction toward the inside and the outside of the first member 20 in the radial direction, respectively. The arm 42 of the engaging piece 40 is arranged in the recess 26.

The first flow path 24 is closer to the second end 22b of the bottom 23 of the first hole 22 than the first end 22a, which is separated from the first end 22a along the rotation direction of the first member 20. It is open to. Of the columns 41 arranged in the first hole 22, a portion near the second end 41b, which is separated from the first end 41a along the rotation direction of the first member 20, covers the first flow path 24. ..

A description will be given by returning to FIG. 2 (a). The second hole 32 is a rectangular recess having a width W in the radial direction (vertical direction on the paper surface of FIG. 3) of the second member 30 when viewed from the axis O direction (vertical direction in FIG. 2A). A plurality of second holes 32 are formed on the circumference of a radius R centered on the axis O of the second surface 31. The width W of the second hole 32 is the same length as the width W of the first hole 21.

Since the width W of the second hole 32 is shorter than the length from the arm 42 to the arm 42 of the engaging piece 40 (see FIG. 3), the engaging piece 40 has the arm 42 on the second surface 31 of the second member 30. It is held down. As a result, in the support column 41 arranged in the first hole 22, the first end portion 41a is fixed to the first hole 22, and the second end portion 41b can enter the second hole 32. The second flow path 34 opens near the portion of the second hole 32 where the second end portion 41b of the support column 41 engages.

As shown in FIG. 2A, when the rotation of the first member 20 is faster than the rotation of the second member 30, the oil tank 56 is operated by the hydraulic pressure generator 58 (see FIG. 1) and the direction control valve 61. Hydraulic oil (pressure oil) is sent from the second oil passage 55. The hydraulic oil that has flowed into the third chamber 53 flows toward the gap 50 through the second flow path 34, exerts a force on the support column 41, and flows into the second chamber 52 through the second flow path 24. The hydraulic oil that has flowed into the second chamber 52 returns to the oil tank 56 through the directional control valve 61.

The hydraulic oil that has entered the gap 50 from the third chamber 53 presses the second end portion 41b of the support column 41 against the bottom 23 of the first hole 22, and the support column 41 is placed at a second position where the support column 41 cannot engage. 41 (second end portion 41b) does not collide with the second member 30 (second hole 32). Therefore, damage to the support column 41 can be suppressed. In addition, it is possible to suppress abnormal noise generated when the support column 41 collides with the second member 30. Since the support column 41 can be placed in the second position by the kinetic energy of the hydraulic oil flowing from the gap 50 (first chamber 51) to the second chamber 52, when the support column 41 is placed in the second position by the pressure of the hydraulic oil. In comparison, the structure of the seal and the like can be simplified.

Since the support column 41 pressed against the bottom 23 of the first hole 22 closes the first flow path 24 that opens to the bottom 23, the hydraulic oil that has entered the gap 50 becomes difficult to flow through the first flow path 24. As a result, when the pressure in the second oil passage 55 becomes high, the hydraulic oil in the second oil passage 55 flows to the oil tank 56 through the pressure control valve 62.

As shown in FIG. 2B, when the rotation of the second member 30 is faster than the rotation of the first member 20 and the torque is transmitted between the first member 20 and the second member 30, oil pressure is generated. Hydraulic oil is sent from the oil tank 56 to the first oil passage 54 by the device 58 (see FIG. 1) and the directional control valve 61. The hydraulic oil that has flowed into the second chamber 52 flows toward the gap 50 through the first flow path 24, exerts a force on the support column 41, and flows into the third chamber 53 through the second flow path 34. The hydraulic oil that has flowed into the third chamber 53 returns to the oil tank 56 through the directional control valve 61.

The hydraulic oil that has entered the gap 50 from the second chamber 52 presses the second end portion 41b of the support column 41 against the second member 30. As a result, the support column 41 is placed in the first position where the first end portion 41a can engage with the first hole 22 and the second end portion 41b can engage with the second hole 32. When the rotation of the second member 30 is faster than the rotation of the first member 20, the first member 20 and the second member 20 and the second member 20 pass through the support column 41 which is oblique between the first hole 22 and the second hole 32. Torque is transmitted to and from the member 30.

Since the column 41 is placed in the first position by the hydraulic oil, the spring that urges the second end portion 41b of the column 41 toward the second member 30 by the elastic force can be omitted. When a spring for urging the support column 41 is used, the spring is arranged between the bottom 23 of the first hole 22 and the support column 41, so that when the clutch 10 is manufactured, the first member 20 and the second member It is difficult to assemble the spring and the engaging piece 40 with the 30. However, since the spring can be omitted, the work of assembling the engaging piece 40 between the first member 20 and the second member 30 can be simplified.

Since the first flow path 24 is formed in the first member 20, and the hydraulic oil flows from the first flow path 24 between the bottom 23 of the first hole 22 and the support column 41, the movement of the flowing hydraulic oil The energy can replace the strut 41 placed in the second position with the first position. In particular, since the first flow path 24 is open to the bottom 23 of the first hole 22, the kinetic energy of the hydraulic oil can be quickly applied to the support column 41. Further, since the first flow path 24 is opened near the second end 22b of the first hole 22, the movement of the hydraulic oil is close to the second end 41b of the support column 41 arranged in the first hole 22. Can give energy. As a result, the second end portion 41b can be swung around the first end portion 41a of the support column 41 quickly.

When disengaging the support column 41 engaged with the first hole 22 and the second hole 32, the oil pressure generator 58 (see FIG. 1) and the directional control valve 61 are used to disengage the oil tank 56 to the second oil passage 55. Hydraulic oil is sent to. The hydraulic oil exerts a force on the support column 41 from the third chamber 53 through the second flow path 34, passes through the gap 50, the second flow path 24, and the second chamber 52, and passes through the directional control valve 61 to the oil tank 56. Reflux to.

Since the second flow path 34 is formed in the second member 30, and the hydraulic oil flows in from the second flow path 34 between the bottom 33 of the second hole 32 and the support column 41, the movement of the flowing hydraulic oil The support 41 can be disengaged by energy. In particular, since the second flow path 34 is open to the bottom 33 of the second hole 32, the kinetic energy of the hydraulic oil can be quickly applied to the support column 41. Further, since the second flow path 34 is opened near the second end portion 41b of the support column 41, the kinetic energy of the hydraulic oil can be applied to the vicinity of the second end portion 41b of the support column 41. As a result, the second end portion 41b can be swung around the first end portion 41a of the support column 41 quickly.

The second embodiment will be described with reference to FIG. In the first embodiment, the case where the first oil passage 54 and the second oil passage 55 are directly connected to the second chamber 52 and the third chamber 53 has been described. On the other hand, in the second embodiment, the oil passages 71 and 72 formed in the drive shaft 11 and the driven shaft 12 communicate with the third chamber 53 and the second chamber 52, respectively, and the first oil is connected to the oil passages 71 and 72, respectively. A case where the road 54 and the second oil passage 55 are connected will be described. The same parts as those described in the first embodiment are designated by the same reference numerals, and the following description will be omitted. FIG. 4 is a piping system diagram of the clutch 70 according to the second embodiment. In FIG. 4, the intermediate portion of the drive shaft 11 and the driven shaft 12 in the longitudinal direction is not shown.

In the clutch 70, the driven shaft 12 is coupled to the first member 20, and the drive shaft 11 is coupled to the second member 30. Is equipped with. In the present embodiment, the second member 30 is coupled to the drive shaft 11, and the first member 20 is coupled to the driven shaft 12. The drive shaft 11 and the driven shaft 12 are formed with oil passages 71 and 72 that open at the center of the end faces of the respective shafts. The oil passage 71 communicates with the third chamber 53, and the oil passage 71 communicates with the second chamber 52. The first oil passage 54 is connected to the oil passage 72, and the second oil passage 55 is connected to the oil passage 71. The first chamber 51, the second chamber 52, and the third chamber 53 are fixed so as not to rotate about the axis O, but may be fixed so as to rotate about the axis O. The clutch 70 in the second embodiment can also realize the same action and effect as the clutch 10 in the first embodiment.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It is easy to infer. For example, the shape of the first hole 22 formed in the first member 20 and the shape of the engaging piece 40 in which the support column 41 is arranged in the first hole 22 are examples and can be set as appropriate.

In the embodiment, the case where the first member 20 is coupled to the driven shaft 12 and the second member 30 is coupled to the drive shaft 11 has been described, but the present invention is not necessarily limited to this. Of course, it is possible to connect the first member 20 to the drive shaft 11 and the second member 30 to the driven shaft 12.

In the embodiment, the case where the clutches 10 and 70 are unidirectional clutches has been described, but the present invention is not necessarily limited to this. Of course, it is possible to provide a two-way clutch by further providing a strut that engages by relative rotation in the opposite direction. In the case of a two-way clutch, it is naturally possible to control a strut that engages by relative rotation in one direction and a strut that engages by relative rotation in the opposite direction by hydraulic circuits of different systems.

In the embodiment, the case where the first flow path 24 is opened in the bottom 23 of the first hole 22 has been described, but the present invention is not necessarily limited to this. The first flow path 24 does not need to be open to the bottom 23 as long as the hydraulic oil can flow between the bottom 23 of the first hole 22 and the support column 41. The first flow path 24 may communicate with the first hole 22.

In the embodiment, the case where the second flow path 34 is opened in the bottom 33 of the second hole 32 has been described, but the present invention is not necessarily limited to this. The second flow path 34 does not need to be open to the bottom 33 as long as the hydraulic oil can flow between the bottom 33 of the second hole 32 and the support column 41. The second flow path 34 may communicate with the second hole 32. The second flow path 34 and the second hole 32 may communicate with each other through the gap 50.

In the embodiment, the case where the spring for urging the second end portion 41b of the support column 41 toward the second member 30 side is omitted has been described, but the present invention is not necessarily limited to this. Of course, it is possible to provide a spring that urges the second end portion 41b of the support column 41 toward the second member 30 side. This is because if the force exerted by the hydraulic oil (hydraulic oil) on the column 41 is larger than the elastic force of the spring, the column 41 can be placed in the second position even if the spring is present.

10,70 Clutch 20 1st member 21 1st surface 22 1st hole 23 Bottom 24 1st flow path 30 2nd member 31 2nd surface 32 2nd hole 33 Bottom 41 Strut 50 Gap 51 1st chamber 52 2nd chamber O Axis

Claims (4)

A clutch that switches between torque transmission and shutoff.
A first member having a first hole formed on a first surface intersecting the axis and rotating around the axis,
A second member in which a second hole is formed in the first surface and the second surface facing in the direction of the axis and rotates about the axis, and
A strut which is arranged in the first hole and swings between a first position where the first hole can be engaged with the second hole and a second position where the engagement with the second hole is disengaged.
A clutch comprising hydraulic oil that exerts a force on the support column to place the support column at the second position. The second hole is a blind hole and
The clutch according to claim 1, wherein a second flow path through which the hydraulic oil flows is formed in the second member between the bottom of the second hole and the support column. A first chamber including a gap between the first surface and the second surface,
The clutch according to claim 1 or 2, further comprising a second chamber into which the hydraulic oil that has flowed into the first chamber and exerted a force on the support column flows into the first chamber. The first hole is a blind hole and
The clutch according to any one of claims 1 to 3, wherein a first flow path through which the hydraulic oil flows is formed in the first member between the bottom of the first hole and the support column.

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