JP3702995B2 - Automatic transmission detent spring roller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is elastically engaged with a tooth-shaped notch formed on the outer periphery of a detent plate that rotates in conjunction with a shift lever of an automatic transmission, and provides a sense of moderation in the operation mode selection operation of the shift lever. The present invention relates to a structure of a detent spring roller of an automatic transmission to be applied.
[0002]
[Prior art]
As is well known, a shift lever of an automatic transmission mounted on an automatic vehicle is provided with a detent plate that rotates in conjunction with the shift lever, and a tooth-shaped outer periphery of the detent plate. A plurality of notches are continuously formed, and a roller of a detent spring having one end portion supported in a cantilever shape on the transmission case side is sequentially elastically engaged with the notches, Generally, a moderation feeling is given to the operation mode selection operation (for example, JP-A-8-247268).
[0003]
[Problems to be solved by the invention]
However, since the conventional detent spring roller is made of only a metal material or a hard synthetic resin, the roller can be used to cut the detent plate even though it can give moderation to the operation mode selection operation. Each time he gets over the notch, a hitting sound is generated and the driving environment is impaired.
[0004]
The present invention was devised in view of the current situation, and an object of the present invention is to provide an automatic transmission that can not only provide a moderation feeling of the operation mode selection operation but also can eliminate sound during operation. Is to provide detent spring roller.
[0005]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, the shift is engaged with a tooth-shaped notch formed on the outer periphery of a detent plate that rotates in conjunction with a shift lever of an automatic transmission. An inner roller body rotatably supported on a roller pin installed between yokes at the tip of the detent spring, and a roller of a detent spring that gives a moderation feeling to the operation mode selection operation of the lever, An outer roller body that is in close contact with the entire outer peripheral surface, and the inner roller body is formed of a synthetic resin having a low friction coefficient and a high hardness, and the outer roller body is a synthetic resin having a high friction coefficient and a low hardness. It is characterized by being formed by.
[0006]
In the present invention, the inner roller body is formed in a cylindrical shape so that the notch of the detent plate and the outer roller body are in contact with each other, thereby obtaining a smooth rotation of the roller and a stable contact. The inner roller body and the outer roller body are made stronger by forming substantially wedge-shaped biting pieces at required intervals along the circumferential direction at both ends of the cylindrical portion. It is desirable to configure so as to obtain such a unity.
[0007]
As the material used for the roller of the present invention, the inner roller body is a synthetic resin having a hardness of 80 or more on the Rockwell / R scale, and a friction characteristic of kinetic friction coefficient / 0.5 or less on steel, for example, polycarbonate (PC ), Polystyrene (PS) {including high impact polystyrene (HIPS)}, acrylonitrile butadiene styrene copolymer (ABS), polyphenylene oxide (modified PPO), polypropylene (PP), polyamide (PA ), Polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyacetal (POM), or any other synthetic resin can be used, and the outer roller body has a hardness of 99 or less in terms of shear A, or , Share D is 60 or less, friction characteristics are dynamic friction For example, when the inner roller body is the above-mentioned PC, a polystyrene-based thermoplastic elastomer (TPS) or a polyurethane-based thermoplastic elastomer (TPU) may be used. When the roller body is PS, the above TPS, when the inner roller body is ABS, the above TPS or TPU, when the inner roller body is a modified PPO, above TPS, and when the inner roller body is PP, Polyolefin-based thermoplastic elastomer (TPO) or TPS, when the inner roller body is PA, soft polyamide (soft PA), polyamide-based thermoplastic elastomer (TPAE) or TPU, and when the inner roller body is PET or PBT Is polyester-based thermoplastic elastomer (TPEE), TPS or TPU, and the inner roller body is POM In this case, it is desirable to use soft POM.
[0008]
In the present invention, when adjusting the hardness and wear resistance of the inner roller body and the outer roller body, the selected synthetic resin is made of glass fiber, carbon fiber, silica, or the same kind thereof. The materials can be mixed and adjusted. In order to reduce the coefficient of friction, for example, a lubricant / oil, a fluorine resin, a ceramic resin, etc. are blended, or a potassium titanate fiber is blended, or an oil-containing resin or a lubricant is blended. You can also.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.
[0010]
As shown in FIGS. 1 and 2, the detent spring 1 according to this embodiment is, for example, on the outer periphery of a detent plate 4 that rotates in conjunction with a shift lever 3 of an automatic transmission disposed in the center console 2. The detent spring 1 is elastically engaged with the formed tooth-shaped notch 5 to give a sense of moderation to the operation mode selection operation of the shift lever 3, and one end of the detent spring 1 is located on the transmission case 6 side. It is fixed with screws in a cantilever shape.
[0011]
That is, the detent spring 1 includes a strip-shaped main body 1A formed of a leaf spring material, a fixed seat 1B formed upright at one end of one end of the main body 1A, and the other end of the main body 1A. The roller 10 according to the present embodiment is composed of yokes 1C and 1C that are bifurcated and roller pins 1D that are fixed at both ends of the yokes 1C and 1C. As shown, the inner roller body 11 rotatably supported by a roller pin 1D installed between the bifurcated yokes 1C and 1C at the tip of the detent spring 1 and the entire outer peripheral surface of the inner roller body 11 And an outer roller body 20 that is in close contact with each other.
[0012]
As shown in FIGS. 8 to 10, the inner roller body 11 includes a main body 13 having a shaft hole 12 through which the roller pin 1D is rotatably inserted, a notch 5 of the detent plate 4, and an outer roller body. And a plurality of substantially wedge-shaped biting piece portions 15 formed at every required interval along the circumferential direction of both ends of the cylindrical portion 14.
[0013]
The inner roller body 11 having such a configuration is, for example, an inner roller body having a hardness of 80 or more in Rockwell / R scale (measurement method: ASTM D785), and a friction characteristic of dynamic friction coefficient / to steel (measurement method: ASTM). D1894) can use a synthetic resin of 0.5 or less.
[0014]
In particular, in this embodiment, PC having a hardness of 120 on the Rockwell / R scale and a friction characteristic of kinetic friction coefficient / 0.3 on steel is used, but other synthetic resins include PS (including HIPS), Any synthetic resin such as ABS, modified PPO, PP, PA, PET, PBT, or POM can be used.
[0015]
Further, the outer roller body 20 that is in close contact with the entire outer peripheral surface of the inner roller body 11 has a smooth outer surface that is free from gate marks, burrs, scratches, and the like when fused to the inner roller body 11. It is configured to form a cylindrical surface, and the material used is 99 or less in hardness A (measurement method: ASTM D2240) or 60 or less in share D, and the friction characteristic is a dynamic friction coefficient / pair. It is desirable to use a synthetic resin of 0.5 or more in steel.
In this embodiment, a TPU having a good fusing property with the PC used for the inner roller body, a hardness of 90 A ± 10 with a shear A, and a friction characteristic of a dynamic coefficient of friction / steel of 0.8 is used.
[0016]
Of course, in the present invention, the present invention is not limited to the above embodiment. For example, when the inner roller body is the PC, TPS can be used. Further, when the inner roller body is PS, the above TPS, when the inner roller body is ABS, the above TPS or TPU, when the inner roller body is a modified PPO, the above TPS, and the inner roller body is PP. TPO or TPS if the inner roller body is PA, soft PA, TPAE or TPU if the inner roller body is PA, TPEE, TPS or TPU if the inner roller body is PET or PBT, and POM if the inner roller body is POM A soft POM can also be used.
[0017]
The roller 10 configured as described above is manufactured by two-color molding or outsert molding of the material of the outer roller body 20 on the inner roller body 11.
[0018]
As described above, the roller 10 according to this embodiment is formed of a synthetic resin having a low coefficient of friction and a high hardness as described above, and therefore follows the unevenness of the tooth-shaped notch 5 formed on the outer periphery of the detent plate 4. As a result, the roller 10 can be smoothly rotated. As a result, the roller 10 is less worn and durable even when used over time, and the outside is formed of a synthetic resin having a high coefficient of friction and low hardness. Further, it is possible to effectively buffer the hitting sound generated by the collision between the roller 10 and the uneven portion while obtaining a moderation feeling with the uneven portion of the detent plate 4 when the roller 10 is moved.
[0019]
Further, the inner roller body 11 of the roller 10 according to the above-described embodiment forms a cylindrical portion 14 that contacts the notch 5 of the detent plate 4 with the outer roller body 20 interposed therebetween. Since rotation can be held smoothly and a plurality of substantially wedge-shaped biting piece portions 15 are formed at required intervals along the circumferential direction of both ends of the cylindrical portion 14, adhesion to the outer roller body 20 is achieved. Can be obtained, and unity as a product can be obtained.
[0020]
【The invention's effect】
As described above, in the first aspect of the invention, the tooth-shaped notch and the elastic contact engagement formed on the outer periphery of the detent plate that rotates in conjunction with the shift lever of the automatic transmission. An inner roller body rotatably supported by a roller pin installed between the yokes at the tip of the detent spring, and a detent spring roller that gives a moderation feeling to the operation mode selection operation of the shift lever. The inner roller body is made of a synthetic resin having a low friction coefficient and a high hardness, and the outer roller body has a high friction coefficient and a hardness. Therefore, it is possible to effectively mute the hitting sound at the time of operation while obtaining a moderation feeling of the operation mode selection operation.
[0021]
According to a second aspect of the present invention, the inner roller body is formed in a cylindrical shape at a position where the inner roller body abuts with the notch of the detent plate via the outer roller body, so that the roller rotates smoothly. Since a substantially wedge-shaped biting piece is formed at each required interval along the circumferential direction at both ends of the cylindrical portion, the inner roller body and the outer roller body Strong integrity can be obtained.
[0022]
Furthermore, in the invention according to claim 3, the inner roller body uses a synthetic resin having a hardness of 80 or more on the Rockwell / R scale and a friction characteristic of a dynamic friction coefficient / 0.5 or less on steel. The outer roller body is made of a synthetic resin having a hardness of 99 or less in shear A or 60 or less in shear D and a friction characteristic of a dynamic friction coefficient / steel to 0.5 or more. There are a number of excellent effects such as being able to obtain wearability and ensuring the integrity of the product.
[Brief description of the drawings]
FIG. 1 is a perspective view of a console portion provided with a shift lever to which a detent spring according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory view showing an example of attachment of the detent spring.
FIG. 3 is a front view of the detent spring.
FIG. 4 is a plan view of the detent spring.
FIG. 5 is a right side view of the detent spring.
FIG. 6 is a front view of a roller that is rotatably supported by the detent spring.
FIG. 7 is a side view of the detent spring roller.
FIG. 8 is a perspective view of an inner roller body of the detent spring roller.
FIG. 9 is a front view of the inner roller body.
FIG. 10 is a sectional view of the inner roller body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Detent spring 1C, 1C Yoke 1D Roller pin 3 Shift lever 4 Detent plate 5 Notch 10 Roller 11 Inner roller body 12 Shaft hole 13 Main body 14 Cylindrical part 15 Biting piece part 20 Outer roller body

Claims (3)

  Detent spring that gives a sense of moderation to the operation mode selection operation of the shift lever by elastically engaging with a tooth-shaped notch formed on the outer periphery of the detent plate that rotates in conjunction with the shift lever of the automatic transmission An inner roller body that is rotatably supported by a roller pin installed between the yokes at the tip of the detent spring, and an outer roller body that is in close contact with the entire outer peripheral surface of the inner roller body. A detent for an automatic transmission characterized in that the inner roller body is formed of a synthetic resin having a low friction coefficient and a high hardness, and the outer roller body is formed of a synthetic resin having a high friction coefficient and a low hardness. Spring roller.   The inner roller body is formed in a cylindrical shape in contact with the notch of the detent plate via the outer roller body, and both end portions of the cylindrical part are arranged at predetermined intervals along the circumferential direction. 2. The detent spring roller for an automatic transmission according to claim 1, wherein a substantially wedge-shaped biting piece is formed.   The inner roller body is made of a synthetic resin having a hardness of 80 or more on the Rockwell / R scale, a friction characteristic of a coefficient of dynamic friction / to steel of 0.5 or less, and the outer roller body has a hardness of 99 or less in share A. 3. The automatic transmission according to claim 1 or 2, wherein a synthetic resin having a shear D of 60 or less and a friction characteristic of a coefficient of dynamic friction / steel of 0.5 or more is used. Detent spring roller.

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