JP2011169422A - Friction engaging device, and assembly tool of friction engaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fall of a return spring when a spring retainer supporting a coiled return spring is bayonet-coupled to a piston guide.
When a spring retainer 20 is coupled to a cylindrical portion 22 of a piston guide 17 by a bayonet coupling portion 25 comprising a notch 20b and a projection 22b, the spring retainer 20 moves in the direction of the axis L while compressing the return spring 19. After the projection 22b passes through the notch 20b, the spring retainer 20 rotates about the axis L and is locked to the cylindrical portion 22 of the piston guide 17. At this time, the first uneven engagement portion 20d provided on the spring retainer 20 by the jig J and the second uneven engagement portion 16e provided on the piston 16 maintain a constant phase relationship, so that the spring retainer with respect to the piston 16 is maintained. It is possible to prevent the return spring 19 from collapsing in the circumferential direction due to the relative rotation of the spring 20, and the assembly work of the spring retainer 20 can be performed easily and reliably.
[Selection] Figure 5

Description

  In the present invention, an annular piston that presses a plurality of friction engagement elements disposed between an outer member and an inner member sharing an axis is supported by a piston guide so as to be axially slidable, and the annular guide is supported by the piston guide. A friction engagement device in which a spring retainer is coupled by a bayonet coupling portion, and a plurality of coiled return springs juxtaposed in the circumferential direction between the piston and the spring retainer are contracted in the axial direction, and the friction engagement device And an assembly jig.

  A multi-plate clutch or brake used in an automatic transmission of an automobile includes a plurality of friction engagement elements arranged between an outer member and an inner member, and a piston that presses these friction engagement elements to engage each other. The following Patent Document 1 discloses a return spring that urges the piston in the disengagement direction, and the return spring is constituted by a disc spring.

Japanese Patent No. 2807542

  By the way, when a coil spring is used in place of the disc spring as a return spring used in a multi-plate type clutch or brake, a plurality of coil springs are arranged in order to apply a uniform urging force to the annular piston. Need to be juxtaposed in the circumferential direction. In such a case, the plurality of coil springs are contracted between one side surface of the piston and one side surface of the spring retainer locked to the piston guide, but the spring retainer is locked to the piston guide by bayonet coupling. However, if the spring retainer is rotated at the time of bayonet coupling, the coil spring falls in the circumferential direction and cannot be assembled correctly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the return spring from collapsing when a spring retainer that supports a coiled return spring is bayonet-coupled to a piston guide.

  In order to achieve the above object, according to the first aspect of the present invention, an annular piston that presses a plurality of friction engagement elements disposed between an outer member and an inner member sharing an axis is used as a piston guide. An axial spring retainer is supported in a slidable manner in the axial direction, an annular spring retainer is coupled to the piston guide by a bayonet coupling portion, and a plurality of coiled return springs juxtaposed in the circumferential direction between the piston and the spring retainer are axially disposed. The bayonet coupling portion includes a notch formed on one of the outer peripheral surface of the piston guide and the inner peripheral surface of the spring retainer, and a protrusion formed on the other. The spring retainer compresses the return spring and moves in the axial direction so that the protrusion passes through the notch. After that, when the spring retainer rotates around the axis and is locked to the piston guide, when the spring retainer is locked to the piston guide, a first uneven engagement portion provided on the spring retainer There is proposed a frictional engagement device characterized in that a constant phase relationship is maintained between the first concave and convex portions and the second concave and convex engaging portions provided on the piston.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the first concave / convex engaging portion is a concave portion formed on the back surface of the spring retainer, and the second concave / convex engaging portion. Is a groove that radially crosses the pressing portion of the piston.

  According to a third aspect of the present invention, there is provided an assembly jig for a frictional engagement device for assembling the frictional engagement device according to the first or second aspect, the jig main body and the jig. A first engagement portion formed on the tool body and engageable with the first uneven engagement portion; and a second engagement portion formed on the jig body and engageable with the second uneven engagement portion. An assembly jig for a friction engagement device is proposed.

  The clutch outer 11 of the embodiment corresponds to the outer member of the present invention, the clutch inner 12 of the embodiment corresponds to the inner member of the present invention, and the engagement groove 16e of the embodiment is the second of the present invention. Corresponding to the concave / convex engaging portion, the engaging recess 20d of the embodiment corresponds to the first concave / convex engaging portion of the present invention, and the first engaging protrusion 26a of the embodiment corresponds to the first engaging portion of the present invention. Correspondingly, the second engagement protrusion 26c of the embodiment corresponds to the second engagement portion of the present invention.

  According to the first aspect of the present invention, when the spring retainer is coupled to the piston guide at the bayonet coupling portion including the notch and the projection, the spring retainer moves in the axial direction while compressing the return spring, and the projection passes through the notch. After that, the spring retainer rotates around the axis and is locked to the piston guide. At this time, the first concavo-convex engaging portion provided on the spring retainer and the second concavo-convex engaging portion provided on the piston rotate while maintaining a constant phase relationship, so the spring retainer rotates relative to the piston and returns. The spring can be prevented from falling in the circumferential direction, and the assembly work of the spring retainer can be performed easily and reliably.

  According to the second aspect of the present invention, since the first concave / convex engaging portion is constituted by the concave portion formed on the back surface of the spring retainer, the concave portion functions as an oil reservoir to improve the lubricating performance of the friction engagement element. In addition, since the second concavo-convex engaging portion is constituted by a groove that crosses the pressing portion of the piston in the radial direction, the lubricating performance can be further enhanced by discharging oil that lubricated the friction engaging element through the groove. .

  According to the third aspect of the present invention, the jig main body of the assembly jig of the friction engagement device has the first engagement portion engageable with the first uneven engagement portion of the spring retainer, and the second unevenness of the piston. Since the second engaging portion that can be engaged with the engaging portion is provided, the operation of connecting the bayonet connecting portion by rotating the spring retainer and the piston integrally can be performed easily and reliably.

The longitudinal cross-sectional view of the clutch of an automatic transmission. The figure which shows the state which removed the clutch inner, the friction engagement element, and the circlip from FIG. FIG. 3 is a view taken along line 3-3 in FIG. 2. The perspective view of a piston, a spring retainer, a return spring, a piston guide, and a jig | tool. Explanatory drawing of the action when assembling the spring retainer (with the jig set). FIG. 6 is a view taken along line 6-6 in FIG. 5 (a state where a jig is set). The figure corresponding to the said FIG. 6 (state which rotated the jig | tool).

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a wet multi-plate hydraulic clutch C used for an automatic transmission of an automobile is fitted to a clutch outer 11, a clutch inner 12, and a clutch outer 11 so as not to rotate and to be slidable in the axis L direction. The plurality of frictional engagement elements 13..., The plurality of frictional engagement elements 14 that are non-rotatable and slidable in the direction of the axis L, and the frictional engagement elements 13. The circlip 15 locked to the outer clutch clutch 11, the piston 16 that presses the friction engagement elements 13, 14... Toward the circlip 15 in the engaging direction, and the piston 16 is slidable. A piston guide 17 for guiding, a hydraulic oil chamber 18 for driving the piston 16 in the engagement direction by hydraulic pressure, and a plurality of cylinders for biasing the piston 16 in the engagement release direction Comprising a Le-shaped return spring 19 ..., and a spring retainer 20 for supporting the return spring 19 ... end of.

  The piston guide 17 is an annular member, and extends inward in the radial direction from one end portion of the clutch outer 11 in the axis L direction, and is connected to the radially inner end of the disc portion 21 in the axis L direction. And a cylindrical portion 22 extending in the direction. The piston body 16a of the piston 16 is slidable through the two seal members 23 and 24 on the first cylinder surface 21a formed on the disk portion 21 and the second cylinder surface 22a formed on the cylindrical portion 22. A fluid-tight hydraulic oil chamber 18 is defined between the piston 16 and the piston guide 17 by these seal members 23 and 24.

  The piston 16 includes a pressing portion 16b that extends radially outward from the piston main body portion 16a and faces the friction engagement element 13 at the right end in the figure, and a cylindrical portion 16c that extends from the piston main body portion 16a in the axis L direction. An annular spring retainer 20 fitted between the cylindrical portion 22 of the piston guide 17 and the cylindrical portion 16 c of the piston 16 is locked to the cylindrical portion 22 of the piston guide 17 by a bayonet coupling portion 25. The both ends of the plurality of return springs 19 in the compressed line L direction are locked to the spring seats 16d provided in the piston main body 16a and the spring seats 20a provided in the spring retainer 20.

  As is apparent from FIGS. 2 to 4, the bayonet coupling portion 25 includes six notches 20 b formed at intervals of 60 ° on the inner peripheral surface of the annular spring retainer 20, and the inner periphery of the spring retainer 20. 12 positioning grooves 20c formed in the back surface (surface opposite to the return spring 19) so as to communicate with the surface and the outer peripheral surface of the cylindrical portion 22 of the piston guide 17 radially outward at 60 ° intervals. It is comprised by six protrusion 22b ... projected in the direction. The notch 20b of the spring retainer 20 has a shape through which the protrusion 22b of the cylindrical portion 22 of the piston guide 17 can pass, and the positioning groove 20c of the spring retainer 20 is fitted with the protrusion 22b of the cylindrical portion 22 of the piston guide 17. It is a shape that can be matched.

  The jig J for assembling the spring retainer 20 to the cylindrical portion 22 of the piston guide 17 has two rod-shaped jig bodies 26, 26 intersecting in a cross shape, and an axis line from the middle part of the jig bodies 26, 26. Four first engaging projections 26a projecting in the L direction, four arm portions 26b projecting in the direction of the axis L from the tips of the jig bodies 26 and 26, and the tips of the four arm portions 26b. Are provided with four second engaging protrusions 26c projecting in the direction of the axis L.

  On the back surface of the spring retainer 20, that is, on the surface opposite to the return springs 19, there are four engagement recesses 20d that can be engaged with the four first engagement protrusions 26a of the jig J, respectively. In addition to being formed at intervals, the pressing portion 16b of the piston 16 is formed with four engagement grooves 16e that can engage with the four second engagement protrusions 26c of the jig J at intervals of 90 °. Is done.

  Next, a procedure for assembling the spring retainer 20 to the piston guide 17 of the hydraulic clutch C will be described.

  First, a spring seat 16d in which the piston body 16a of the piston 16 is fitted to the first cylinder surface 21a and the second cylinder surface 22a formed on the piston guide 17 integrated with the clutch outer 11, and is recessed in the piston body 16. One end of each return spring 19 is inserted into each. Subsequently, the inner peripheral surface of the spring retainer 20 is fitted to the outer peripheral surface of the cylindrical portion 22 of the piston guide 17, and the other end of the return spring 19 is inserted into the spring seat 20 a that is recessed in the spring retainer 20. .

  Subsequently, the four first engaging protrusions 26a of the jig J are engaged with the four engaging recesses 20d formed on the back surface of the spring retainer 20, and the four second members of the jig J are engaged. The mating protrusions 26c are engaged with the four engaging grooves 16e formed in the pressing portion 16b of the piston 16. In this state, the jig J is rotated while being pushed in the direction of the axis L, so that the phases of the six notches 20b of the spring retainer 20 coincide with the phases of the six protrusions 22b of the cylindrical portion 22 of the piston guide 17. Then, the jig J is further pushed to a position where the projections 22b pass through the notches 20b, thereby obtaining the state shown in FIGS. When the jig J is rotated, the spring retainer 20 and the piston 16 rotate together, so that the return springs 19 mounted between the spring retainer 20 and the piston 16 do not fall in the circumferential direction.

  Subsequently, when the jig J is further rotated by a predetermined angle clockwise or counterclockwise, as shown in FIG. 7, the six protrusions 22b of the cylindrical portion 22 have six notches 20b of the spring retainer 20. And the six positioning grooves 20c of the spring retainer 20 are opposed to each other. When the jig J is pulled to the front from this state, the spring retainer 20 is pushed forward by the elastic force of the compressed return springs 19, and the six positioning grooves 20 c of the spring retainer 20 have six cylindrical portions 22. The protrusions 22b... Are fitted, and the spring retainer 20 is bayonet-coupled to the piston guide 17. Also in this case, since the spring retainer 20 and the piston 16 rotate integrally with the rotation of the jig J, the return springs 19 mounted between the spring retainer 20 and the piston 16 do not fall down in the circumferential direction.

  As described above, according to the present embodiment, when the spring retainer 20 is assembled to the piston guide 17 by the bayonet coupling portion 25, the spring retainer 20 and the piston 16 are integrally rotated by the jig J. Further, the return springs 19 attached between the two pistons 16 are prevented from rotating relative to each other, and the circumferential direction of the return springs 19 is prevented from falling down, so that the troublesome assembly work of the spring retainer 20 can be performed easily and reliably.

  Further, the frictional engagement elements 13... 14 of the hydraulic clutch C are lubricated by oil supplied from the inside of the transmission shaft 27 (see FIG. 1) fitted to the cylindrical portion 22 of the piston guide 17, but are spring retainers. Since the engagement recesses 20d formed on the back surface of the nozzle 20 function as an oil reservoir, the oil can be supplied to the friction engagement elements 13... 14 without interruption, and the lubrication performance can be improved.

  Further, since a passage extending in the radial direction is formed between the four engagement grooves 16e formed in the pressing portion 16b of the piston 16 and the friction engagement element 13 located at the end, the friction engagement element The lubricating performance of the frictional engagement elements 13, 14, can be further improved by discharging the oil whose temperature has risen after finishing the lubrication of 13, 14, 14 through the passage by centrifugal force.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the bayonet coupling portion 25 of the embodiment is configured by a notch 20b on the spring retainer 20 side and a protrusion 22b on the cylindrical portion 22 side, but the relationship between the notch and the protrusion is interchanged, and the spring retainer 20 is replaced. A protrusion may be provided on the side and a notch may be provided on the cylindrical portion 22 side.

  In the embodiment, the first and second engagement protrusions 26a, 26c,... Are provided on the jig J side, and the engagement recesses 20d, and the engagement grooves 16e, are provided on the spring retainer 20 side and the piston 16 side. However, the relationship between the protrusion and the groove may be reversed. That is, the jig J only needs to be able to engage with the spring retainer 20 and the piston 16 in an uneven manner.

  The friction engagement device of the present invention is not limited to the hydraulic clutch C of the embodiment, and may be a hydraulic brake, an electromagnetic clutch or an electromagnetic brake.

11 Clutch outer (outer member)
12 Clutch inner (inner member)
13 Friction engagement element 14 Friction engagement element 16 Piston 16b Press part 16e Engagement groove (second uneven engagement part)
17 Piston guide 19 Return spring 20 Spring retainer 20b Notch 20d Engaging recess (first uneven engaging portion)
22b Projection 25 Bayonet coupling portion 26 Jig body 26a First engagement projection (first engagement portion)
26c 2nd engaging protrusion (2nd engaging part)
L axis

Claims (3)

An annular piston (16) that presses the plurality of friction engagement elements (13, 14) disposed between the outer member (11) and the inner member (12) sharing the axis (L) is used as the piston guide (17). An axial spring retainer (20) is coupled to the piston guide (17) by a bayonet coupling portion (25), and is supported slidably in the axial direction (L). The piston (16) and the spring retainer (20) A friction engagement device in which a plurality of coiled return springs (19) juxtaposed in the circumferential direction are contracted in the direction of the axis (L),
The bayonet coupling portion (25) includes a notch (20b) formed on one of the outer peripheral surface of the piston guide (17) and the inner peripheral surface of the spring retainer (20) and a protrusion (22b) formed on the other. The spring retainer (20) moves in the direction of the axis (L) while compressing the return spring (19), and after the projection (22b) passes through the notch (20b), the spring retainer (20) rotates around the axis (L) and is locked to the piston guide (17).
When the spring retainer (20) is locked to the piston guide (17), a first unevenness engaging portion (20d) provided on the spring retainer (20) and a second unevenness provided on the piston (16). A friction engagement device characterized in that the engaging portion (16e) maintains a constant phase relationship.   The first concavo-convex engaging portion (20d) is a recess formed in the back surface of the spring retainer (20), and the second concavo-convex engaging portion (16e) is a pressing portion (16b) of the piston (16). The friction engagement device according to claim 1, wherein the friction engagement device is a groove that traverses in a radial direction. An assembly jig for a friction engagement device for assembling the friction engagement device according to claim 1,
A jig body (26), a first engagement part (26a) formed on the jig body (26) and engageable with the first uneven engagement part (20d), and the jig body (26 And a second engagement portion (26c) that can be engaged with the second uneven engagement portion (16e).

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