JP3178355B2 - Plate-type cushioning member for multi-plate clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a first clutch pack and a second clutch pack which are arranged side by side in the axial direction on the inner periphery of a common clutch drum, and which presses the first and second clutch packs individually. And a multi-plate clutch having a second clutch piston, in which the second clutch piston presses the second clutch pack via an annular dish-shaped buffer member that is harder than the first clutch piston. The present invention relates to a dish-shaped buffer member for a multi-plate clutch.

[0002]

2. Description of the Related Art Such a multi-plate clutch is disclosed in, for example, "NISS" issued in May 1989 by the present applicant.
AN Automatic Transaxle RL4F03
There is a multi-plate clutch for an automatic transmission described in the "A type maintenance manual".

FIG. 7 is a cross-sectional view illustrating a multi-plate clutch of an automatic transmission according to the prior art. A first clutch pack C _{1 of a} first clutch and a second clutch pack
A second clutch pack C ₂ clutch is arranged axially.

[0004] The first clutch pack C ₁ is provided with an outer peripheral protrusion 5 _p annularly clutch plate 5 is fitted in the axial groove D _n of the clutch drum D, and the annular clutch plates 5, an annular clutch plate 6 (which are rotationally engaged with a clutch hub (not shown)). At this time, the engagement of the first clutch is performed via the annular dish-shaped buffer member 2.
Axial projections P _1p of the clutch piston P ₁ is carried out by pressing the first clutch pack C _1.

On the other hand, the second clutch pack C ₂ is provided with an annular projection 3 _p on the annular clutch plate 3 and a clutch drum D
Axial grooves D _n having to fit, the annular clutch plate 3
And an annular clutch plate 4 (rotatingly engaged with another clutch hub, not shown) are arranged alternately. The outer circumferential projection 3 _p of the annular clutch plate 3 is fitted in the axial grooves D _n through a slot that forms an axial protrusion P _1p of P ₁ in the radial direction. At this time, the second
When the clutch is engaged, the second clutch piston P ₂ is connected to the second clutch pack C ₂ via the annular dish-shaped buffer member 10.
Is performed by pressing.

As described above, in the multiple disc clutch of the automatic transmission, the shock generated when the clutch is engaged is improved by pressing the clutch piston against the clutch pack via the annular dish-shaped buffer member. ing.

[0007]

Since the dish-shaped cushioning member functions as a "spring", a hard material is generally used. On the other hand, since the clutch piston does not need to function as a "spring", a material such as iron that is not hardened or aluminum is used for the purpose of reducing the weight of the automatic transmission. In any case,
The clutch piston is generally made of a material softer than the dish-shaped buffer member.

However, as shown in FIG. 8, which is a front view as viewed from the ZZ section of FIG.
Since 0 is annular, it may rotate relative to the first clutch piston P ₁ (axial projection P _1p ). Further, since the plate-type buffer member 10 is a member having a smaller axial thickness than the annular clutch plate 3, when the rotation of the second clutch fluctuates, the plate-type buffer member 10 owns its own inertial force. -type buffer member 10 rotate relative to the first clutch piston P ₁ occurs, there is a problem that the outer periphery 10 _e dished cushioning member 10 abrade the inner periphery P _1e of the first clutch piston.

[0009] Therefore, the outer peripheral protrusions (not shown) provided in the dish-shaped cushioning member 10, the outer peripheral projection of the dish-type buffer members 10, slots forming the first axial protrusion P _1p of the clutch piston P ₁ If through the Δc radially to configure to fit in the axial grooves D _n of the clutch drum D, dish-shaped cushioning member 1
0 does not rotate relative to each other, the radial position of the dish-shaped cushioning member 10 can be defined.
Wear in _1e can be prevented.

Incidentally, as shown in FIG. 7, the first clutch piston P ₁ secures a stable position by a seal member interposed between the first clutch piston P ₁ and the inner periphery of the clutch drum D. May cause relative rotation with respect to the clutch drum D. Accordingly, an annular clutch plate outer peripheral protrusions 3 _p, in addition to the annular clutch plate 3 itself positioning serves to regulate the relative rotation of the first clutch piston P _1.

However, the provision of the outer peripheral projections on the dish-shaped cushioning member 10 allows the outer peripheral projections 3 _p of the annular clutch plate to have the first clutch piston axial projections P as in the prior art.
Instead of restricting the relative rotation in contact with _1p, sometimes the peripheral projection of the first clutch piston rigid dished cushioning member 10 than P ₁ is regulated in contact. This contact has a disadvantage that the dish-shaped cushioning member 10 wears the circumferential side edge P _1f (see FIG. 8) of the first clutch piston axial projection P _1p .

In view of the above, the present invention is produced by providing the outer peripheral projection on the dish-shaped buffer member which is harder than the first clutch piston, so that the dish-shaped buffer member comes into contact with the first clutch piston. An object of the present invention is to prevent wear and improve the durability of the first clutch piston.

[0013]

For this purpose, according to the present invention, a disk-shaped cushioning member of a multi-plate clutch according to the present invention is fitted into an axial groove formed on the inner periphery of a common clutch drum. A first clutch piston and a second clutch pack, each of which includes a plurality of annular clutch plates having outer peripheral protrusions, which are arranged side by side in the axial direction, and individually presses the first clutch pack and the second clutch pack. And a second clutch piston is disposed on a side of the second clutch pack far from the first clutch pack,
The first clutch piston has an axial projection that penetrates a gap existing between outer peripheral projections of an annular clutch plate that forms the second clutch pack and stops rotation.
A multi-plate clutch configured to press a clutch pack, wherein the second clutch piston presses the second clutch pack via an annular dish-shaped buffer member that is harder than the first clutch piston; The dish-shaped cushioning member includes an outer peripheral projection that radially penetrates a slot that forms an axial projection of the first clutch piston and that is fitted with an axial groove of the common clutch drum. The circumferential side edge of the outer peripheral projection of the cushioning member does not protrude from the circumferential side edge of the outer peripheral projection of the annular clutch plate forming the second clutch pack toward the axial projection of the first clutch piston. It is characterized by having comprised.

[0014]

As described above, according to the first aspect of the present invention, the disk-shaped cushioning member of the multi-plate clutch has an outer peripheral projection provided on the disk-shaped cushioning member harder than the first clutch piston. By radially penetrating the groove forming the axial projection of the first clutch piston and fitting it into the axial groove of the common clutch drum, the dish-shaped cushioning member does not rotate relatively. Since the radial position of the dish-shaped cushioning member can be defined, the inner periphery of the first clutch piston does not wear.
In addition, the circumferential side edge of the outer peripheral projection of the dish-shaped buffer member is moved from the circumferential side edge of the outer peripheral projection of the annular clutch plate forming the second clutch pack to the axial projection side of the first clutch piston. With the configuration that does not protrude, the circumferential side edge of the outer peripheral projection of the dish-shaped buffer member can be prevented from contacting the circumferential side edge of the axial projection of the first clutch piston. Wear on the circumferential side edge of the axial projection of the first clutch piston does not deteriorate. Therefore, according to the present invention, the disc-shaped cushioning member of the multi-plate clutch according to claim 1 prevents the abrasion caused when the disc-shaped cushioning member comes into contact with the first clutch piston, thereby preventing the first clutch piston from being worn. Can be improved in durability.

[0015]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

[0016] Figure 1 is a sectional view showing the forward clutch drum that constitutes the automatic transmission of a vehicle, the two members D _a, the forward clutch drum D which is composed of D _b
The inner periphery of a groove D _n in the axial direction, the forward clutch of the clutch pack (hereinafter, a first clutch pack) C
₁ and, the overrun clutch clutch pack (hereinafter, second clutch pack) to parallel the C ₂ in the axial direction.

[0017] The first clutch pack C ₁ has a circular annularly clutch plate 5 provided with an outer peripheral protrusion 5 _p fitted in axial grooves D _n, and the annular clutch plates 5, an annular clutch plate 6
(Which is rotationally engaged with a clutch hub (not shown)). On the other hand, the second clutch pack C ₂ is provided with an outer circumferential projection 3 _p on the annular clutch plate 3 and an axial groove D _n.
The annular clutch plate 3 and the annular clutch plate 4 (rotatingly engaged with another clutch hub, not shown) are alternately arranged.

[0018] The farther the second side of the clutch pack C ₂ from the first clutch pack C ₁ to place the first clutch piston P ₁ and the second clutch piston P _2. The first clutch piston P ₁ has an axial projection P _1p penetrating a gap existing between the outer peripheral projections 3 _p of the annular clutch plate 3, and via the dish plate 2 which is an annular dish-shaped buffer member. Te first presses the annular clutch plates 5 of the clutch pack C _1, second clutch piston P ₂ through the dish plate 1 is dished cushioning annular member, the second circle of the clutch pack C ₂ The annular clutch plate 3 is pressed.

The outer periphery this time, the outer periphery of the dish plate 1, which fits through the slot to form a first axial protrusion P _1p of the clutch piston P ₁ radially projecting axial groove D _n A projection 1 _p is provided.

Here, the annular dish plate 1,
2 is made of a hard material (for example, “carbon tool steel material” specified in “JIS G 4401”) to serve as a “flat spring” specified in “JIS B 2706”. For the first and second clutch pistons P ₁ and P ₂ , a material such as iron that is not hardened or aluminum that is softer than the dish plates 1 and 2 is used for the purpose of reducing the weight of the transmission body.

The engagement of the forward clutch and the overrun clutch is performed by connecting the ports H ₁ ,
A hydraulic pressure adjusted by H _2, by the spring force of the spring S which is fixed to the clutch drum D, the first and second clutch piston P _1, P ₂ is stroke inner periphery of the clutch drum D in the axial direction, the 1 is performed by pressing the respective annular clutch plate 3 of the clutch pack C ₁ of annular clutch plates 5 and the second clutch pack C _2. Conversely, release of the forward clutch and the overrun clutch is performed by draining oil from ports H ₁ and H ₂ .

FIG. 2 is a front view of the overrun clutch drum when FIG. 1 is viewed from the cross section ZZ. Since the dish plate 1 is on the back side of the annular clutch plate 3 (the back side in the drawing), the outer periphery of the dish plate 1 is shown. The projection 1 _p is shown in a perspective view by broken lines and oblique lines.

The first clutch piston P ₁ has a plurality of slots Δc forming an axial projection P _1p , and has a dish plate outer peripheral projection 1 _p and an annular clutch plate outer peripheral projection 3 _p.
But protrudes through the slot Δc radially fitted into the axial groove D _n of the clutch drum D.

Next, the outer periphery of the dish plate 1
and _p, the relation between the annular clutch plate outer peripheral protrusions 3 _p, will be described in more detail.

FIG. 3 is a partial enlarged view showing a region X in FIG. 2, indicated by broken lines and shaded dish plate outer peripheral protrusion 1 _p is perspectively shown.

The annular clutch plate outer peripheral protrusions 3 _p is circumferential width a in the trunk portion of the outer peripheral projection 3 _p (first clutch piston radial thickness regions d of P ₁₎ is an axial groove D of the clutch drum D These are stepped projections wider than the circumferential width of the tip portion _3pe fitted with _n .

The dish plate outer peripheral protrusion 1 _p is also circumferential width b of the body portion of the outer peripheral protrusions 1 _p (first clutch radial thickness regions d of the piston P ₁₎ is the tip portion 1
It is a stepped projection wider than the circumferential width of _pe ,
The circumferential width a of the annular clutch plate outer peripheral protrusion _{3p in} the body portion is set to be wider than the circumferential width b of the dish plate outer peripheral protrusion _{1p in} the body portion.

However, the dish plate outer peripheral projection 1 _p and the annular clutch plate outer peripheral projection 3 _p are both symmetrical with respect to the radial axis.

At this time, the outer periphery of the dish plate 1
interval delta ₁ is dish plate outer peripheral protrusions 1 _p of the distal end portion 1 _pe (annular clutch plate outer periphery between the circumferential side edge 1 _pf an annular clutch plate outer peripheral protrusions 3 circumferential edge 3 _pf the _p in _p the tip portion of the projection 3 _p 3 _pe) and axial grooves D _n
It is preferable to define the dimensions of a margin to be larger than the circumferential backlash delta ₂ with.

[0030] That is, in the first clutch piston P ₁ of the radial thickness regions d, dish plate outer peripheral protrusions 1
_p is always in a state hidden in the annular clutch plate outer peripheral protrusions 3 _p.

[0031] Thus, as shown in FIG. 3, if from rattling delta _2, if the dish plate 1 and the annular clutch plate 3 are relatively rotated in the counterclockwise watched from the drawings relative to the clutch drum D, dish plate Outer protrusion 1 _p
Circumferential side edge 1 _pf in does not protrude from the circumferential edge 3 _pf the annular clutch plate outer peripheral protrusions 3 _p to the side of the first clutch piston axial projections P _1p. Therefore, the circumferential side edge P of the first clutch piston axial projection P _1p is obtained.
Circumferential edge 3 _pf contacts the annular clutch plate outer peripheral protrusions 3 _p in _1f, restricting the relative rotation of the first clutch piston P _1.

Further, as shown in FIG. 4, if the backlash delta _2, and relative rotation in the opposite direction dish plate 1 is an annular clutch plate 3, the tip portion 1 _pe, 3 _pe is axially different orientations even when in contact with the groove D _n, the circumferential side edge 1 _pf the dish plate outer peripheral protrusion 1 _p is a from the circumferential edge 3 _pf the annular clutch plate outer peripheral protrusions 3 _p 1
It does not protrude to the side of the clutch piston axial projections P _1p. Accordingly, the first clutch piston axial projection _P1p is provided with the circumferential side edge _3p of the annular clutch plate outer peripheral projection _3p .
_pf contacts, to regulate the first clutch piston P _1.

Furthermore, as shown in FIG. 5, if backlash delta ₂
Accordingly, when the dish plate 1 and the annular clutch plate 3 rotate relative to the clutch drum D clockwise as viewed from the drawing, similarly, the circumferential side edge 1 _pf of the dish plate outer peripheral projection 1 _p is circular. do not protrude from the circumferential edge 3 _pf the annular clutch plate outer peripheral protrusions 3 _p to the side of the first clutch piston axial projections P _1p, annular clutch plate outer peripheral protrusions 3 _p is regulating the first clutch piston P ₁ I do.

[0034] In addition, as shown in FIG. 6, if backlash delta ₂
As a result, the dish plate 1 becomes the annular clutch plate 3
Opposite direction relative rotation, even when the distal end portion 1 _pe, 3 _pe is in contact with the separately axial groove D _n, similarly, the circumferential side edge 1 _pf the dish plate outer peripheral protrusion 1 _p is an annular do not protrude from the circumferential edge 3 _pf the clutch plate outer peripheral protrusions 3 _p to the side of the first clutch piston axial projections P _1p, annular clutch plate outer peripheral protrusions 3 _p regulates the first clutch piston P ₁ .

Accordingly, the outer periphery of the dish plate 1 _p
Circumferential side edge of the play may delta ₂ occurs, hard dish plate outer peripheral protrusion 1 _p than the first clutch piston P ₁ between the axial grooves D _n of the clutch drum D and 1
_Instead of the _pf contacting the circumferential side edge P _1f of the first clutch piston axial protrusion P _1p, the circumferential side edge 3 _pf of the annular clutch plate outer circumferential protrusion 3 _p is changed to the first side in the conventional manner.
Circumferential side edge P at clutch piston axial projection _P1p
For contact with _1f, by a circumferential edge 1 _pf the dish plate outer peripheral protrusions 1 _p, circumferential edge P _1f of the first clutch piston axis projection P _1p is worn.

When the dish plate 1 and the annular clutch plate 3 are fixed and the first clutch piston P ₁ is rotating relative to the clutch drum D in a state where there is no backlash Δ ₂ , the outer periphery of the dish plate Protrusion 1
_p is always, of course, is in a state hidden annular clutch plate outer peripheral protrusions 3 _p.

[0037] Thus, in the absence of backlash delta _2, since the annular clutch plate outer peripheral protrusions 3 _p regulates the relative rotation of the first clutch piston P _1, by a circumferential edge 1 _pf the dish plate outer peripheral protrusion 1 _p The circumferential side edge P _1f of the first clutch piston axial projection P _1p is not worn.

As described above, the dish plate of the multi-disc clutch according to the present invention has a structure in which the dish plate 1 does not rotate relative to each other without the relative rotation of the dish plate by the engagement of the outer peripheral projections 1 _{p of the} dish plate with the axial grooves D _n. Since the radial position of the first clutch piston 1 can be defined, as shown in FIG. 2, the inner circumference P _1e of the first clutch piston, which easily contacts the outer circumference 1 _e of the dish plate 1 due to relative rotation, does not wear.

In addition, the dish plate outer peripheral projections 1 _p
Circumferential side edge 1 _pf in is configured so as not to protrude from the circumferential edge 3 _pf the annular clutch plate outer peripheral protrusions 3 _p in the circumferential direction side edge P _1f side in the first clutch piston axis projection P _1p by, it can be avoided that the circumferential side edge 1 _pf the dish plate outer peripheral protrusion 1 _p is in contact with the circumferential side edge P _1f of the first clutch piston axis projection P _1p, first clutch piston axis projection P Wear at the circumferential side edge P _1f at _1p does not deteriorate.

Further, as described above, the distance between the circumferential edge 3 _pf in the circumferential direction side edge 1 _pf an annular clutch plate outer peripheral protrusions 3 _p in dish plate outer peripheral protrusion 1 _p delta
₁ and the tip 1 of the outer periphery of the dish plate
_pe If defining a circumferential backlash delta ₂ of (the tip portion of the annular clutch plate outer peripheral protrusions 3 _p 3 _pe) and the axial groove D _n to a predetermined size, if, dish plate outer peripheral protrusions 1 _p and the annular even if the backlash occurs between the axial grooves D _n of the clutch plate outer peripheral projection 3 _p and the clutch drum D, the wear of the first clutch piston axis projection P _1p is not deteriorated.

Therefore, in the dish plate of the multiple disc clutch according to the present invention, the dish plate ₁ which is harder than the first clutch piston P ₁ has the first clutch piston P _1.
Abrasion can be prevented which occurs when contacting the can improve the first durability of the clutch piston P _1.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing the embodiment in FIG. 1 from a ZZ cross section.

FIG. 3 is a first diagram illustrating an operation of an enlarged area X in FIG. 2;

FIG. 4 is a second diagram illustrating the operation of the enlarged area X in FIG. 2;

FIG. 5 is a third diagram illustrating the operation of the enlarged area X in FIG. 2;

FIG. 6 is a fourth diagram illustrating the operation of the enlarged area X in FIG. 2;

FIG. 7 is a cross-sectional view showing a conventional plate-type cushioning member of a multi-plate clutch.

FIG. 8 is a front view showing the conventional technique of FIG. 7 from a ZZ cross section.

[Explanation of symbols]

Reference Signs List 1 dish plate 1 _p dish plate outer peripheral projection 2 dish plate 3 annular clutch plate 3 _p annular clutch plate outer projection 4 annular clutch plate 5 annular clutch plate 5 _p annular clutch plate outer projection 6 annular clutch plate C ₁ Forward clutch pack C ₂ Overrun clutch pack D Overrun clutch drum D _n axial groove P ₁ first clutch piston P _1p first clutch piston axial projection P ₂ second clutch piston

Claims (1)

(57) [Claims] 1. A first clutch pack and a second clutch pack each comprising a plurality of annular clutch plates having an outer peripheral projection fitted into an axial groove formed on an inner periphery of a common clutch drum. A first clutch piston and a second clutch piston that individually press the first clutch pack and the second clutch pack, respectively, are disposed on the side of the second clutch pack far from the first clutch pack; The clutch piston has an axial projection that penetrates a gap existing between the outer peripheral projections of the annular clutch plate that forms the second clutch pack and prevents rotation.
The clutch pack is pressed, and the second clutch piston is connected to the second clutch piston via an annular dish-shaped buffer member harder than the first clutch piston.
In the multi-plate clutch configured to press a clutch pack, the dish-shaped buffer member radially penetrates a groove forming an axial projection of the first clutch piston in an axial direction of the common clutch drum. An outer circumferential projection that fits into the groove; a circumferential side edge of the outer circumferential projection of the dish-shaped buffer member is separated from a circumferential side edge of the outer circumferential protrusion of the annular clutch plate that forms the second clutch pack; A dish-shaped cushioning member for a multi-plate clutch, which is configured so as not to protrude toward the axial projection of the piston.