JP2002106657A - Slide key and continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform force fitting or fitting without biting when the slide key is mounted to a groove of a rotating shaft. SOLUTION: This slide key is used for engaging a slide cylinder in the axial direction of the rotating shaft slidably and follow rotatably, and is a complex integrated molded article of a metal molded body and a resin body. A corner part of a slide key bottom fitting with the groove part formed in the outer periphery of the rotating shaft is formed on the resin body longitudinally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding key which is suitable for use in a special environment such as high-temperature non-lubrication and comprises a composite integrally molded product of a metal molded body and a resin body, and a sliding key using the sliding key. It relates to a continuously variable transmission.

[0002]

2. Description of the Related Art As a pulley structure of a continuously variable transmission using a sliding key, a pulley of a continuously variable transmission in which a fixed pulley that rotates integrally with a rotating shaft and a movable pulley that has a sliding cylinder are engaged by a sliding key. The structure is known (JP-A-8-219258). A pulley structure and a slide key of a conventional continuously variable transmission will be described with reference to FIGS. FIG. 4 shows an axial half-section of the pulley structure, and FIG. 5 shows the shape of the sliding key. A rotating shaft 4 driven by an engine (not shown) is supported by a transmission body 6 by bearings 5a and 5b. A fixed pulley 7 is integrally formed on the rotating shaft 4 so as to protrude outward. A stepped portion 4a formed on the outer periphery of the rotating shaft 4 has an elongated hole formed in the outer periphery thereof in the longitudinal direction. Depressed grooves 4b are formed at regular intervals in the circumferential direction. A slide key 1 is fitted into the groove 4b, and a movable pulley 8 having a slide cylinder 8a slidable by the slide key 1 so as to be able to move toward and away from a fixed pulley 7 is engaged. . The sliding key 1 fitted into the groove 4b is mainly required to prevent rotation or to transmit power, and is also required to have an axial reciprocating function as an additional function. In FIG. 4, reference numeral 9 denotes a V-belt mounted between the fixed pulley 7 and the movable pulley 8.

Conventionally, as a sliding key 1, a sliding key of a composite integrally molded product of a metal molded body and a resin body has been known (Japanese Patent Laid-Open No. 2000-55067). An example of this sliding key is shown in FIG.
Shown in FIG. 5A is a plan view of the sliding key, and FIG.
5A is a front view, and FIG. 5C is a cross-sectional view taken along line DD of FIG. The sliding key 1 includes a metal molded body 2 and a resin body 3, and the resin body 3 is formed integrally with the metal molded body 2. Further, a portion of the sliding key to be fitted into the groove 4b formed on the outer periphery of the step portion 4a of the rotating shaft shown in FIG. 4 is the metal molded body 2, and a portion sliding with the inner circumferential groove of the slide cylinder 8a is provided. The resin body 3. Metal fitting 2
By doing so, the fitting force of the sliding key 1 is improved, and the sliding property between the sliding cylinder 8a and the rotary shaft 4 is improved by making the sliding portion the resin body 3.

On the other hand, in order to press-fit the fitting portion of the sliding key 1 into the groove portion 4b, a chamfering process is performed on the corner portion 3e at the bottom. If the chamfering is not performed, when the fitting is press-fitted into the groove 4b, it may bite, or may be fitted diagonally,
Problems such as the time required for the fitting process occur.

[0005]

However, the chamfering of the corners 3e is performed by polishing or milling, but the number of working steps is increased, thereby lowering productivity and increasing manufacturing costs. There's a problem. In addition, a metal molded body 2 which has been subjected to a surface treatment such as plating.
There is a problem that rust is generated at the machined part by machining the machine.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and has a sliding key which can be press-fitted or fitted without being galled when mounted in a groove, and a continuously variable transmission using the sliding key. The purpose is to provide a machine.

[0007]

SUMMARY OF THE INVENTION A sliding key according to the present invention is a sliding key for engaging a sliding cylinder so as to be slidable in the axial direction of a rotating shaft and to be capable of following rotation. And a resin body, and a corner of a bottom portion of the sliding key which fits into a groove provided on an outer peripheral portion of the rotating shaft is formed of the resin body in a longitudinal direction. And Further, the resin body is made of a resin composition that can be injection molded. Also, a protrusion pin mark at the time of injection molding is formed in a resin portion on the bottom surface which fits into a groove provided on the rotating shaft.

In the continuously variable transmission according to the present invention, a groove is formed in an outer peripheral portion, a fixed pulley that rotates integrally with a rotary shaft having a slide key fitted in the groove, and a circumferential direction in which the slide key is received. A movable pulley provided with a slide cylinder having an inner peripheral portion formed with a groove extending in the axial direction and having a width corresponding to the groove on the outer peripheral portion of the rotating shaft, wherein the sliding key is It is characterized by being.

The sliding key according to the present invention is an integrally molded product of a metal molded body and a resin body, and the corner of the bottom of the sliding key which fits into a groove provided on the outer peripheral portion of the rotating shaft has the above-mentioned shape in the longitudinal direction. By being formed of a resin body, when the fitting is press-fitted into the groove portion, the resin portion starts to contact the groove portion, so that the press-fitting can be performed without galling or the like. Also, in the case of fitting, the corner of the resin body is not damaged by providing the corner at the bottom of the sliding key. Further, by forming the corner portion to be a chamfered portion into a molded article of a resin body, a chamfering process in a later step is not required, so that productivity is improved and rust does not occur.

Since the continuously variable transmission of the present invention uses the above-mentioned sliding key, it is easy to assemble, and a continuously variable transmission having smooth operation performance in a non-lubricated atmosphere can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sliding key according to the present invention will be described with reference to FIG. 1A is a plan view of a sliding key, FIG. 1B is a front view, FIG. 1C is a bottom view, and FIG. 1D is a sectional view taken along the line AA in FIG. The sliding key 1 includes a metal molded body 2 and a resin body 3.
Is formed integrally with the metal molded body 2. The shape of the sliding key 1 may be any shape as long as it can be press-fitted into a groove 4b formed on the outer periphery of a step portion 4a of the rotating shaft as shown in FIG. Also, the groove 4
It is preferable that most of the part to be press-fitted into b has the metal molded body 2 and the part sliding on the inner peripheral groove of the slide cylinder 8 a be the resin body 3. By making most of the press-fitting fitting portion a metal molded body 2, the fitting force of the sliding key 1 is improved, and by making the sliding portion a resin body 3, the sliding property between the slide cylinder 8a and the rotary shaft 4 is improved. improves.

As the metal molded body 2, a machined product, a forged product, a lost wax product, a sintered metal product, a metal injection product, or the like can be used. Among these, a lost wax product and a sintered metal product are preferred for reasons such as strength reliability and cost. Further, surface treatment such as plating can be performed to prevent rust on the surface.

The shape of the metal molded body 2 is preferably such that the resin body 3 and the metal molded body 2 cannot be separated during operation of the continuously variable transmission when integrally molded. Specifically, FIG.
As shown in (d), the metal molded body 2 is provided with a groove or a through hole 2a. Due to the through holes 2a and the like, the resin body 3 is filled into the grooves and the through holes 2a at the time of integral molding to form a composite of the resin composition and the metal. It becomes a solid integrated product without using it.

Further, a longitudinal corner 3a at the bottom of the sliding key is provided.
1 is a resin body 3, the cross-sectional shape of the metal molded body 2 is a cross shape, and the corner 2 b on the bottom side forming the longitudinal corner 3 a is inwardly recessed (FIG. 1 (d)). )).
It is preferable that the corner portion 2b having a concave shape inward is large enough to allow the resin to flow into the corner portion 3a during injection molding, and is inclined when the slide key is press-fitted into the groove portion 4b of the rotating shaft. It is preferable to have the side surface portion 2c of the metal molded body having a sufficient size so as not to come off. Specifically, it is preferable that the corner 2b includes the inclined portion of the corner 3a, and that the bottom surface and the side surface of the sliding key 1 have a size that can be partially formed of the resin body 3. Although it differs depending on the resin body 3 to be used, in the case of a resin mainly composed of a thermoplastic polyimide resin and a polyetherketone resin described later, in FIG.
1515) mm × (5-15) mm, the corner 2b on one side is
It is preferable that the bottom and side surfaces have a slackness of (0.5 to 3.0) mm. When the press-fitting is not required, a part of the longitudinal corner 3a at the bottom of the sliding key can be formed as the resin body 3.

The resin composition forming the resin body 3 may be any resin composition that can be integrally formed with the metal molded body 2.
As the molding method, injection molding, compression molding, transfer molding and the like can be used. Among these, a resin composition that can be injection-molded is preferable. This is because even if the metal molded body 2 has a complicated shape, it can be easily integrally molded. Examples of resin components that can be injection molded include thermoplastic polyimide resins, polyether ketone resins, polyether ketone resins such as polyether ketone resins, polyacetal resins, polyamide resins, polyethylene resins, polyamide imide resins, polyether nitrile resins, and aromatic resins. Group polyester resin, polyphenylene sulfide resin and the like. These can be used alone or in the form of a polymer alloy or a polymer blend composed of two or more resins.

Among these, a thermoplastic polyimide resin and a resin containing a polyether ketone resin as a main component capable of obtaining a sliding key having excellent mechanical strength and slidability are preferable. As the thermoplastic polyimide resin, Aurum or the like manufactured by Mitsui Chemicals, Inc., and as the polyetherketone resin, VEETREX MC or the product name PEE
K150P, trade name PEK220G manufactured by ICI, and the like, respectively.

The resin composition constituting the resin body 3 includes a solid lubricant such as tetrafluoroethylene resin, graphite, molybdenum disulfide, tungsten disulfide, graphite fluoride, boron nitride, silicon nitride, glass fiber and carbon fiber. , Fillers such as whiskers, and various fillers such as calcium carbonate, clay, and mica.

The injection molding method according to the present invention is obtained by injection-filling a resin composition into a mold in which a metal molded body 2 is arranged. Depending on the shape of the metal molded body 2, the number of gates may be plural, and a one-point gate method or a multi-point gate method can be adopted. For example, the sliding key shown in FIG. 1 shows an example using a two-point gate system in which two gate marks 11 remain.
Further, the integrally formed slide key 1 is taken out of the mold by a protruding pin from the surface opposite to the gate. By arranging the position of the protruding pin at a position to be the resin portion on the bottom surface, the metal molded body 2 and the resin body 3 are taken out of the mold without peeling, thereby improving the productivity. As a result, protrusion pin traces 10 during injection molding are formed on the resin portion on the bottom surface of the slide key 1.

The continuously variable transmission according to the present invention includes the above-described sliding key 1.
It is characterized by using. By using the sliding key 1 described above, a small-sized, light-weight, low-cost continuously variable transmission having a simple structure can be obtained. Fig. 2 shows how the sliding key 1 is used.
Shown in FIG. 2 is a view showing a rotary shaft fitted with a sliding key. FIG. 2A is a perspective view of a step 4a of the rotary shaft.
(B) is a sectional view when the sliding key is press-fitted or fitted. In FIG. 2A, a groove 4b is formed in a step portion 4a formed on the outer periphery of the rotating shaft so as to be recessed in an elongated shape in the longitudinal direction on the outer periphery. The grooves 4b are preferably formed at least at one position, preferably at several positions at equal intervals in the circumferential direction. The slide key 1 is fitted in the groove 4b, and slidably engages the slide cylinder (FIG. 2).
(B)). When the continuously variable transmission is assembled by using the slide key 1 as the slide key and adopting the conventional components shown in FIG. 4 as other components, the slip key 1 does not seize and is press-fitted. did it. The continuously variable transmission has a temperature of about
Under the operating environment of 120 ° C, load of about 250kgf, and sliding speed of 1.4mm / sec, no seizure or breakage occurred.

FIG. 3 shows, as a comparative example, an example in which the corner 2b having a concave shape inward is formed only on the inclined portion of the longitudinal corner 3a of the sliding key bottom. 3 (a) is a plan view of the sliding key, FIG. 3 (b) is a front view, FIG. 3 (c) is a bottom view, FIG. 3 (d) is a CC enlarged sectional view in FIG.
(E) shows BB enlarged sectional views in FIG. If the corner 2b having a concave shape on the inside is small, it becomes difficult for the resin to flow at the time of injection molding, and the resin cannot fill the entire corner at the bottom of the sliding key. That is, a portion 3c filled with resin and a portion 3d not filled occur.
(B), (c)). As a result, there is a portion in which no bottom corner is formed by the resin body (FIG. 3E). In the portion 3d where the resin is not filled, the corners of the metal molded body 2 have an acute angle, and a galling phenomenon or the like occurs when the metal molded body 2 is press-fitted into the groove. Also, the resin body 3 formed in the corner of the bottom of the sliding key
Since the portion is thin and not integrated, the adhesion between the metal molded body 2 and the resin body 3 is reduced.

[0021]

The sliding key according to the present invention is a composite integrally formed product of a metal molded body and a resin body, and is provided with a longitudinal corner at the bottom of the sliding key which fits into a groove provided on the outer periphery of the rotating shaft. Is formed of the above-mentioned resin body, so that it can be press-fitted or fitted without galling when mounted in the groove. Further, since the post-chamfering process is not required, the productivity is improved. Further, since no rust is generated, the durability is excellent.

Further, since the resin body is made of a resin composition that can be injection-molded, it can be easily integrally formed with a metal molded body having a complicated shape. As a result, a sliding key with excellent mechanical properties and low cost can be obtained.

Further, since the protrusion pin mark at the time of injection molding is formed on the resin portion on the bottom surface which fits into the groove provided on the rotating shaft, even if the product is a complex integrally molded product having a complicated shape, the resin body and Excellent adhesion to metal moldings.

Since the continuously variable transmission of the present invention uses the above-described sliding key, it can be easily mounted and has a simple structure, and a small, lightweight and low-cost continuously variable transmission can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a sliding key.

FIG. 2 is a view showing a rotating shaft fitted with a sliding key.

FIG. 3 is a diagram showing an example of a sliding key shown as a comparative example.

FIG. 4 is an axial half-sectional view of a pulley structure.

FIG. 5 is a view showing a conventional sliding key.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding key 2 Metal molding 3 Resin body 4 Rotating shaft 5 Bearing 6 Transmission body 7 Fixed pulley 8 Movable pulley 9 V belt 10 Protruding pin mark 11 Gate mark

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Claims (4)

[Claims] 1. A slide key for engaging a slide cylinder so as to be slidable and followable in the axial direction of a rotary shaft, wherein the slide key is a composite integrally molded product of a metal molded body and a resin body. A sliding key, wherein a corner of a bottom of the sliding key that fits into a groove provided on an outer peripheral portion of the rotating shaft is formed of the resin body in a longitudinal direction. 2. The sliding key according to claim 1, wherein the resin body is made of a resin composition that can be injection molded. 3. A protruding pin mark at the time of injection molding is formed on the resin portion on the bottom surface.
The slip key described. 4. A fixed pulley having a groove formed in an outer peripheral portion thereof and integrally rotating with a rotating shaft fitted with a slide key in the groove, and having a circumferential width in which the slide key is received and having an axial direction. A continuously variable transmission having a movable pulley provided with a slide cylinder formed on an inner peripheral portion of the rotary shaft so as to correspond to a groove portion of an outer peripheral portion of the rotary shaft, wherein the sliding key is configured as described in claim 1. A continuously variable transmission characterized by a sliding key.