JP3377722B2 - One-way clutch rattle prevention device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biasing device for preventing rattling noise of a one-way clutch, and more particularly to positioning a spring for restricting play of an outer race of the one-way clutch.

[0002]

2. Description of the Related Art Conventionally, some automatic transmissions are provided with a one-way clutch that locks a rotating element, which is involved as a reaction force element in gear shifting, in a case. The outer race of such a one-way clutch is usually incorporated by engaging an uneven portion made of splines on the inner circumference of the case with an uneven portion made of splines on the outer circumference of the outer race. It is inevitable that a certain amount of play is left in the meshing portion in the circumferential direction.

Due to the nature of the mechanism of the one-way clutch, a large reverse torque is applied to the outer race when the free state is switched to the locked state. Therefore, rotation of the outer race that fills the play causes a rattling noise due to collision with the case. Occurs. In order to prevent this rattling noise, a technology that interposes a wavy ring disc spring between the outer race and the case, presses the outer race against the case with its repulsive force, and regulates the movement of the outer race with frictional force is a special feature. It is disclosed as a conventional example in Kaihei 1-307525.

Further, in the above publication, as an improvement to the above technique, both ends are supported between the outer circumference of the outer race and the inner circumference of the case by the adjacent convex portions of the outer race, and the intermediate mountain portion is a tooth missing portion of the case. A technique is also disclosed in which a corrugated leaf spring fitted in a portion is interposed and the repulsive force regulates the movement of the outer race.

[0005]

By the way, in the technique described in the above-mentioned conventional example, if the disc spring is not accurately centered with respect to the outer race, a uniform urging force is applied to the entire circumference of the end face of the outer race. However, it is difficult to obtain the desired effect in a stable manner, but there is no disclosure of a solution to this point. Further, the technique disclosed as the improved technique can be applied to the case where the meshing portion between the outer race and the case has a relatively large margin, but cannot be applied to the outer race in which this portion is closely meshed and centered accurately.

Therefore, in the present invention, in the technique of pressing the outer race against the case by the repulsive force of the spring and restricting the movement of the outer race by the frictional force, the annular spring is centered with respect to the outer race of the one-way clutch to stably stabilize the outer race. It is a first object of the present invention to provide a rattling noise preventing biasing device for a one-way clutch that applies a biasing force to the clutch.

A second object of the present invention is to enable the above centering with a simple structure which does not require an adjusting operation, and to stably maintain the achieved centering state.

A third object of the present invention is to restrict the movement of the outer race with an annular spring having a small biasing force, and to prevent the force that prevents the centering state from continuing from acting on the annular spring.

A fourth object of the present invention is to achieve the above objects by incorporating an annular spring without the need for processing the case.

[0010]

In order to achieve the above-mentioned first object, a rattling noise preventing biasing device for a one-way clutch according to the present invention bites an uneven portion on the outer circumference of an outer race with an uneven portion on the inner circumference of a case. It is composed of a one-way clutch that is also assembled in the case, and an annular spring that urges the outer race in the axial direction and presses it against the case to restrict rotation of the outer race and prevent gear rattling of the meshing portion. , The radial biasing force is applied to counteract the radial biasing force.
The ring spring is always in the outer race due to the resultant reaction force.
While urging in one direction against the heart, the concave and convex parts of the outer race
It is characterized in that it has a centering means composed of a locking piece portion that engages with the portion .

In order to achieve the second object, the centering means is composed of a pair of locking pieces that engage with the concave portion of the outer race concave and convex portion by applying a biasing force in the radial direction.
The pair of locking pieces are arranged asymmetrically with the center of the outer race interposed therebetween.

Further, in order to achieve the third object, the direction of deviation with respect to the diameter of the pair of locking pieces due to the asymmetrical arrangement sandwiching the center of the outer race is the rotational direction of the outer race when the one-way clutch is free. .

In order to achieve the fourth object, the pair of locking piece portions are provided at positions corresponding to the breather groove of the case and the lubricating oil passage, respectively.

[0014]

According to the constitution of the above-mentioned claim 1,
Due to the centering means, the annular spring is always
While biasing in one direction toward the center of the
The outer race is centered directly on the outer race in a state where the displacement is restricted by the engagement with the concave portion of the outer race, so that the outer race is stably pressed against the case by a uniform biasing force in the circumferential direction by the annular spring. As a result, an appropriate frictional force can be obtained, whereby the rotation of the outer race can be regulated and the rattling noise of the one-way clutch can be prevented.

In the second aspect of the invention, the pair of locking pieces are biased in the radial direction, and the locking pieces are arranged asymmetrically with respect to the center of the outer race. Therefore, a force that shifts the center acts on the annular spring itself. However, since the locking pieces are in contact with the recesses of the outer race, the displacement of the annular spring is restricted. Therefore, the elasticity of the annular spring is always biased in one direction with respect to the center of the outer race, and its movement is restricted. Even if an external force acts in the opposite direction, the annular spring can return to itself. And stable centering is achieved. Further, as the means for centering, it is only necessary to provide the locking piece portion extending from the annular spring, so that the structure is simple and inexpensive.

Further, according to the third aspect of the invention, since the direction of the deviation of the two locking pieces of the annular spring with respect to the diameter of the outer race is the direction of rotation of the outer race when the one-way clutch is free, it is large when locked. Since it is not necessary to hold the reaction torque with the annular spring, the annular spring is sufficient because it exerts a biasing force that stops rotation against the drag torque acting on the outer race.
The size can be reduced. Moreover, since the reaction torque acts on the annular spring as a force in the centering direction, it is possible to prevent the centering from being displaced after being assembled.

Further, in the structure according to the fourth aspect, since the breather groove and the lubricating oil passage originally provided in the case are used to insert the locking piece, the annular spring is attached.
Since it is not necessary to lack teeth on the convex portion of the case corresponding to the concave portion of the outer race that engages the locking piece portion for mounting the annular spring, the desired effect can be exhibited without performing additional work on the case. it can.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, to explain from a schematic configuration, a rattling noise preventing biasing device for a one-way clutch according to the present invention constitutes a case 1 as shown in FIG. 1 in which a rearmost portion of an automatic transmission to which it is applied is shown in an axial cross section. The outer race 3 is attached to the uneven portion 11 on the inner periphery of the extension housing 10 connected to the rear portion of the transmission case 16.
A one-way clutch 2 incorporated in the extension housing 10 by engaging the uneven portion 31 on the outer periphery of the
It is composed of an annular spring 6 that urges the outer race 3 in the axial direction and presses it against the extension housing 10.

The annular spring 6 is taken out of the outer race 3 as a centering means for centering itself on the outer race 3 (see FIG. 1) according to the present invention as shown in FIG. The recessed portion of the portion 31 is provided with a pair of locking piece portions 61 and 62 that are engaged by applying a biasing force in the radial direction. Both of these locking pieces 61, 6
As for the positional relationship between the outer race 3 and the outer race 3, as shown in FIG. 7, both locking piece portions 61 and 62 are arranged asymmetrically with the center O of the outer race 3 interposed therebetween. Then, both locking piece portions 6
The direction of the deviation S with respect to the diameter of the outer race 3 of 1, 62 is the rotation direction of the outer race 3 (clockwise direction in FIG. 7) when the one-way clutch 2 shown in FIG. 1 is free. Further, the both locking piece portions 61 and 62 are
The breather groove 13 of the case 1 and the lubricating oil passage 1 shown in FIG.
4 are provided in correspondence with.

Further, each part will be described in detail. First, as shown in FIG. 1, the case 1 is the extension housing 10 in this embodiment, and the uneven portion 11 on the inner periphery thereof is in the axial direction of the extension housing 10. Spline teeth 11a and spline grooves 11b (see FIG. 2).
See) and consists of a spline. A contact surface 12 with which the rear end surface of the outer race 3 contacts is formed at the rear end of the spline 11. As shown in the front view of the extension housing 10 as seen from the opening side in FIG. 2, the breather groove 13 is formed by cutting out the spline teeth 11a at a position slightly closer to one side (right side in FIG. 2) from the uppermost part. Is further provided, and the lubricating oil passage 14 is provided at the lowermost part in the same manner as the spline teeth 11a are lacking.

Next, as shown in FIG. 1, the one-way clutch 2 includes an inner race 4 which is supported by a shaft 15 extending from a rotary element of a transmission (a ring gear of a planetary gear in this embodiment) by a spline fitting so as to prevent rotation. The outer race 3 is provided on the outer periphery of the outer race 3, and a one-way lock mechanism 5 including a sprag and the like is provided between the outer race 3 and the outer race 3.

The outer diameter of the annular spring 6 is slightly smaller than the inner diameter of the extension housing 10, and as shown in FIG. It is a disc spring having a plurality of claw portions 63 that incline and project toward the side), and the tip of each claw portion 63 is provided at a circumferential position where it comes into contact with the end surface of the outer race 3. The outer peripheral ring portion 60 is provided with the uneven portion 31 of the outer race 3, that is, the spline groove 3 shown in FIG. 7.
According to the circumference of the groove bottom of 1b, in the case of this embodiment, on the circumference 2
The diameter is reduced at a portion, and locking piece portions 61 and 62 are formed to extend rearward (toward the front side in FIG. 3) from the outer peripheral side of the reduced diameter portion.

As shown in FIGS. 4 to 6 by comparing the shape of each part and the cross-sectional shape of that part, in the part where the claw portion 63 projects, as shown in FIG. 63 is simply projected at a predetermined angle. Further, in the portion where the locking piece portions 61 and 62 are provided,
As shown in FIGS. 5 and 6, the locking piece portions 61 and 62 extending in the axial direction from the outer peripheral ring portion 60 are provided with urging portions 61a and 62a that bend together. One of the locking piece portions 61 has a wide width, and as shown in FIG. 7, the width thereof is substantially the width of the spline groove 31b of the outer race 3 into which the locking piece portion 61 is fitted. The reference numeral 62 is narrow, and the width thereof is narrower than the width of the spline groove 31b of the outer race 3 into which it is fitted, that is, about half.

The annular spring 6 having such a structure is shown in FIG.
As shown in, the two engaging piece portions 61 and 62 are attached to the outer race 3 of the one-way clutch in such a manner that they are fitted into the spline groove 31b. At that time, the wide locking piece portion 61 is closely fitted and positioned in the spline groove 31b, and the narrow locking piece portion 62 is initially fitted in an arbitrary position of the spline groove 31b. Due to the reaction force generated by the engagement with and, it rotates in the direction in which the diameter decreases (clockwise direction in the drawing), and is positioned so as to contact the side surface of the spline tooth 31a. This operation is the centering operation unique to the present invention.

The centering operation will be further described below. As shown in FIG. 7, the reaction force of the locking springs 61 and 62 of the annular spring 6 with respect to the diameter reducing force is as shown by arrows in the figure. Radial forces F1 and F2,
Ryokakaritomehen portions 61 and 62 by these forces if force F3 is generated in response to the angle θ, which forms with respect to the center of the outer race 3, acts the force on the locking piece portion 62 as a moment lock piece portion 61 around To do. As a result, a clockwise rotating force is always applied to the annular spring 6, and the locking piece portion 62 is rotated to a position where it comes into contact with the side surface of the spline tooth 31a. Therefore, by setting the center of the annular spring 6 to coincide with the center of the outer race 3 in this state, the centering is performed only by fitting the annular spring 6 into the outer race 3.

The annular spring 6 attached to the outer race 3 of the one-way clutch 2 in this manner is the extension housing 1 incorporating the one-way clutch 2.
As shown in FIG. 1, the outer peripheral ring portion 60 is brought into contact with the rear end surface of the transmission case 16 and the claw portion 63 is brought into contact with the front end surface of the outer race 3 by assembling 0 into the case main body as shown in FIG. The unloaded state shown in the figure shifts to the loaded state shown by the solid line, and a reaction force is applied to the transmission case 16 to apply an axial biasing force that presses the outer race 3 against the contact surface 12.

By the way, in this transmission, the one-way clutch 2 is locked by the reverse rotation of the inner race 4 and is in the free state by the normal rotation. Therefore, as shown in FIG. 7, the inner race generates a counterclockwise reaction torque. In the received locked state, the outer race 3 that receives this reaction torque via the one-way locking mechanism also rotates in the counterclockwise direction, and the spline teeth 31a and 11a are in contact with each other with a small gap. On the contrary, when shifting to the free state, the inner race rotates in the clockwise direction, and the drag torque acts on the outer race 3. However, due to the load of the axial pressing force of the annular spring corresponding to this torque. The outer race 3 is prevented from rotating so that it can maintain the position shown in the drawing in which the gap in the counterclockwise direction is closed. Therefore, when the outer race 3 is locked again, even if a large reaction torque is applied to the outer race 3, the outer race 3 does not rotate in the counterclockwise direction, so that the spline teeth 31
Generation of rattling noise due to collision between a and 11a is prevented.

Further, the annular spring 6 for suppressing the clockwise rotation of the outer race 3 when the drag torque acts,
When a counterclockwise reaction torque is applied to the outer race 3, a large amount of displacement force is applied. The counterclockwise rotation of the outer race 3 with respect to the annular spring 6 causes the annular spring 6 to move with respect to the outer race 3. The ring spring 6 rather
Acts to correct the centering of.

As described above in detail, in the above-mentioned structure, the annular spring 6 is directly centered on the outer race 3 when assembled to the outer race 3 by the engaging piece portions 61 and 62, and moreover, the gear of the transmission is used. Since the centering is not distorted during operation, the outer race 3 is stably pressed by the extension housing 10 with a uniform biasing force by the annular spring 6 in the circumferential direction, and is held with an appropriate frictional force. As a result, the rotation of the outer race 3 is always restricted, and the rattling noise of the one-way clutch is prevented.

The present invention has been described above in detail based on the embodiment. However, the present invention is not limited to the disclosure of the above embodiment, and various details can be obtained within the scope of the matters described in the claims. It goes without saying that the specific configuration can be changed and implemented. In particular, in the above-described embodiment, the annular spring is supported by the outer race only by the pair of locking piece portions serving as the centering means, but other locking piece portions that do not hinder the centering action are provided to provide centering. It is also possible to adopt a configuration in which the pair of locking piece portions and the other locking piece portions support each other.

[Brief description of drawings]

FIG. 1 is an axial partial cross-sectional view of a rear portion of an automatic transmission incorporating a rattling noise prevention biasing device for a one-way clutch according to an embodiment of the present invention.

FIG. 2 is a front view of an extension housing of the automatic transmission.

FIG. 3 is a rear view showing an annular spring of the rattling noise prevention biasing device.

FIG. 4 is a partial rear view and a partial sectional view partially showing a claw portion of the annular spring.

5A and 5B are a partial rear view and a partial sectional view partially showing one locking piece portion of the annular spring.

FIG. 6 is a partial rear view and a partial cross-sectional view partially showing the other locking piece portion of the annular spring.

FIG. 7 is a cross-sectional view in the axial direction showing the positional relationship between both locking pieces of the annular spring and the outer race of the one-way clutch.

[Explanation of symbols]

1 case 2 one-way clutch 3 outer race 6 annular spring 10 extension housing (case) 11 splines (uneven parts) 13 breather groove 14 Lubricating oil passage 31 spline (uneven part) 31b Spline groove (recess) 61 Locking piece (centering means) 62 Locking piece (centering means)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazunori Ishikawa 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture, Aisin AW Co., Ltd. (72) Kazuhisa Ozaki 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin・ AW Co., Ltd. (72) Inventor Mikio Iwase 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (72) Katsuyuki Asaoka 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin・ AW Co., Ltd. (72) Inventor Makoto Hijikata 10 Takane, Fujii-cho, Anjo City, Aichi Prefecture Aisin AW Co., Ltd. (72) Inventor Jun Tabata, Toyota City, Aichi Prefecture Toyota Town, Toyota Motor Vehicle Incorporated (72) Inventor Kagenori Fukumura 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd. ( 72) Inventor Yasuo Hojo 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Shoichi Sayo 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Hideki Miyata Aichi 1 Toyota Town, Toyota-shi, Toyota Prefecture (72) Inventor Rei Kimura 1 Togo-machi, Aichi-gun, Aichi-gun, Haruki-ji, Tochi Seisakusho Co., Ltd. (56) Reference: JP-A-7-139563 ( JP, A) Actual flat 4-88728 (JP, U) Actual flat 6-35683 (JP, U) Actual flat 4-109231 (JP, U) Actual flat 7-28238 (JP, U) (58 ) Fields surveyed (Int.Cl. ⁷ , DB name) F16D 41/00-41/36 F16B 21/18

Claims (4)

(57) [Claims] 1. A one-way clutch assembled into a case by engaging an uneven portion on an outer periphery of an outer race with an uneven portion on an inner periphery of the case, and urging the outer race in an axial direction to press the outer race.
And an annular spring that restricts rotation of the outer race to prevent gear rattling of the meshing portion. The annular spring applies a radial biasing force to the radial direction.
The annular spring is always outer by the resultant force of the reaction force against the biasing force.
Outer race while pushing in one direction to the center of the race
A rattling noise prevention urging device for a one-way clutch, comprising centering means composed of a locking piece portion that engages with the concave portion of the uneven portion . 2. The centering means comprises a pair of locking piece portions that engage with the concave portion of the outer race uneven portion by applying a biasing force in the radial direction, and the pair of locking piece portions sandwich the center of the outer race. The rattling noise-preventing biasing device for the one-way clutch according to claim 1, wherein the biasing device is arranged asymmetrically. 3. The direction of deviation with respect to the diameter due to the asymmetrical arrangement with the center of the outer race between the pair of locking pieces is
The biasing device for preventing rattle noise of the one-way clutch according to claim 2, wherein the outer race is rotated in a rotating direction when the one-way clutch is free. 4. The rattling noise preventing bias of the one-way clutch according to claim 2, wherein the pair of locking pieces are provided at positions corresponding to the breather groove of the case and the lubricating oil passage, respectively. apparatus.