JP2008045571A - Vibration absorbing and sliding type constant velocity joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in a conventional vibration absorbing measure in which an outer ring of a constant velocity joint is formed in a double structure with inner and outer members and vibration absorbing rubber is laid in a fitting clearance between the inner and the outer members, and the rubber generates heat by vibration. <P>SOLUTION: At a portion supporting a roller 4 on a trunnion 3 of a tripod member 2, vibration is suppressed and interrupted by using metal disc springs 14 which are laid between each of recessed portions 11 formed on both side faces of the trunnion 3 and the inner face of the roller 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sliding type constant velocity joint used for power transmission in various industrial machines and vehicles, and more particularly to a vibration-proof sliding type constant velocity joint.

  A conventionally known anti-vibration measure for a sliding type constant velocity joint is that the outer ring of the constant velocity joint is formed by a fitting structure of the outer outer ring and the inner outer ring, and the fitting clearance between the outer outer ring and the inner outer ring is The anti-vibration rubber was interposed between the two. In this case, in order to eliminate the problem that the relative rotation occurs due to an excessive load applied to the outer outer ring and the inner outer ring and damages the anti-vibration rubber, an interference portion is provided on the fitting surface of both to exceed a certain level. Relative rotation is prevented (see Patent Document 1 and Patent Document 2).

The anti-vibration rubber is interposed in the outer ring, which is in the middle of the vibration transmission path between the trunnion of the sliding type constant velocity joint and the outer ring, and acts to absorb vibrations transmitted through the path.
Japanese Patent No. 2678039 JP-A-5-10343

  In the above-mentioned conventional constant velocity joint, when minute vibrations are added to the vibration-proof rubber without interruption, heat is generated in the rubber structure due to repeated load applied to the rubber, and the internal pressure inside the joint increases with the heat generation, There were problems that caused damage to the rubber boots covering the joint and reduced the life of the joint itself. In addition, it is necessary to fix the anti-vibration rubber between the outer outer ring and the inner outer ring by vulcanization adhesion or the like, which causes problems such as hindering workability.

  Accordingly, an object of the present invention is to provide a vibration-proof sliding type constant velocity joint in which the problem of heat generation unique to rubber is solved by using a metal leaf spring instead of rubber as a vibration-proof member.

  In order to solve the above-described problems, the present invention, as shown in FIG. 1, belongs to the axial section of the tripod member 2, and the trunnion 3 has two axially symmetric outer sections of the trunnion 3 itself. A recess 11 that is open to the radial surface is formed, and a non-contact surface 12 that does not contact the inner diameter surface of the roller 4 is formed on the outer peripheral surface of the trunnion 3 between the recesses 11. Interference projections 13 are formed between the side walls of the respective recesses 11, and each of the recesses 11 stores a metal leaf spring 14 as the vibration absorbing member on the bottom surface of the recess 11. A contact member 15 that forms a universal contact portion 10 at a contact portion is housed in a free state in the radial direction of the trunnion 3, and an inner diameter of the roller 4 is formed to be larger than a center distance of the interference projection 13. 15 is the above By the spring 14 is urged radially outwardly adopting pressing was constructed on an inner surface of the roller 4.

  According to the above configuration, since the vibration transmission between the tripod member 2 and the outer ring 1 does not short-circuit the leaf spring 14 due to the presence of the non-contact surface 12, a route that passes only the leaf spring 14 is always formed. The vibration transmitted by is suppressed or blocked by the elasticity of the leaf spring 14. Further, when the overload is applied, the interference protrusion 13 interferes with the inner diameter surface of the roller 4 so that the overload acting on the leaf spring is regulated.

  Further, instead of the above configuration, as shown in FIG. 6, the cross section including the center point of the trunnion 3 and the central axis of the tripod member 2 is defined as a reference section B, and contact planes 16 are provided on both sides of the reference section. The non-contact surface 12 that does not contact the inner diameter surface of the roller 4 is formed on the outer peripheral surface of the trunnion 3 between the contact planes 16, and the contact member 17 is disposed so as to face the contact planes 16. On the opposite surface of the contact member 17, there are provided a recess 18 and interference protrusions 19 facing the contact plane 16 on both sides in the trunnion 3 radial direction of the recess 18, and the bottom surface of the recess 18 serves as the vibration absorbing member. The metal leaf spring 20 is accommodated, and the universal contact portion 10 is formed by contact between the leaf spring 20 and the contact plane 16, and each contact member 17 is connected to the plate. Is urged by the roots 20 radially outward can take pressing was constructed on an inner surface of the roller 4.

  Also in this case, the vibration is attenuated and cut off by the leaf spring 20 as described above, and an overload acting on the leaf spring 20 due to the presence of the interference protrusion 19 is prevented.

  As described above, in the vibration-proof sliding type constant velocity joint of the present invention, the universal contact portion made of a metal leaf spring is configured between the trunnion and the roller fitted to the trunnion, and only the leaf spring is formed. The vibrations are transmitted through. As a result, a transmission path that always passes through the leaf spring is formed without short-circuiting the vibration transmission, so that the vibration transmission is effectively suppressed and blocked. Moreover, since the overload countermeasure with respect to a leaf | plate spring is made, the lifetime improvement can be achieved.

  Further, since rubber is not used as the vibration isolating member and a metal leaf spring is used, various problems relating to rubber can be solved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The anti-vibration sliding type constant velocity joint of the first embodiment shown in FIGS. 1 to 3 includes an outer ring 1, a tripod member 2 housed in the outer ring 1, and three trunnions 3 of the tripod member 2. Each roller 4 is supported by a universal contact portion.

  The outer ring 1 is provided with an axial track groove 5 at a circumferentially divided position of 3 on the inner surface, and as shown in FIG. 2, the section of the track groove 5 swells in the radial direction when viewed in cross section. Forms a clover. One end surface of the outer ring 1 is opened, and the tripod member 2 is inserted from the opened portion. An outer ring shaft 6 is integrally provided on the closed surface of the outer ring 1.

  In the tripod member 2, trunnions 3 projecting in the radial direction are integrally provided on land portions 8 provided at three equal positions on the outer periphery of the boss portion 7. The tripod shaft 9 is fitted and fixed to the center portion of the boss portion 7. The tripod shaft 9 is coaxial with the outer ring shaft 6 when an operating angle θ described later is 0 °.

  As shown in FIG. 3, in the axial cross section of the trunnion 3, concave portions 11 that are opened outward on both sides of the center O are formed symmetrically. The position of the recess 11 in the entire tripod member 2 can be described as follows. That is, like the two recesses 11 shown in FIG. 2 which is a sectional view taken along the line X1-X1 in FIG. 1, and the two recesses 11 shown in FIG. 3 which is a sectional view taken along the line Y1-Y1 in FIG. As described above, each recess 11 belongs to one axial section of the tripod member 2 and is opened outward of the trunnion 3 at two symmetrical positions with respect to the center O of the axial section of the trunnion 3 itself. It is formed.

  As apparent from the axial cross-sectional shape of FIG. 3, the outer peripheral surface of the trunnion 3 between the concave portions 11 on both sides is formed by an arc surface having a radius of curvature larger than the inner diameter of the roller 4 fitted to the trunnion 3. However, when compared with the same center O, the size is formed so as not to contact the inner diameter surface of the roller 4 in any part. This surface is referred to as a non-contact surface 12.

  Both end portions of the non-contact surface 12 are continuous with the side walls of the concave portions 11 on both sides, but a curved surface having a small radius of curvature is formed between both end portions of the non-contact surface 12 and the side walls of the concave portion 11. . This curved surface portion is referred to as an interference protrusion 13. The four interference protrusions 13 are the portions with the largest radius on the entire circumference of the trunnion 3.

  A metal leaf spring 14 that is curved in a mountain shape is housed on the bottom surface of each of the recesses 11 with the protruding portion facing outward. The height of the protrusion from the bottom surface of the recess 11 is formed to be equal to or lower than the height of the interference protrusion 13.

  A contact member 15 having a width smaller than the width of the recess 11 faces the opening of the recess 11 and is disposed so as to be freely movable in the radial direction of the recess 11. The contact member 15 has an inner surface that is a flat surface, and an outer surface that is formed as an arc surface along the inner diameter surface of the roller 4. The contact member 15 is interposed between the protruding portion of the leaf spring 14 and the inner diameter surface of the roller 4, and is pressed against the inner diameter surface of the roller 4 by the elasticity of the leaf spring 14. 3 is supported.

  Moreover, the universal contact part 10 is comprised by the protrusion part of the leaf | plate spring 14 being pressed on the said flat surface of the contact member 15 with required elasticity. Here, the universal contact portion 10 refers to a two-member contact structure that can be rotationally contacted at a free angle without directivity. The universal contact portion 10 can be configured not only by the line contact such as the protruding portion of the leaf spring 14 and the flat surface of the contact member 15 as described above, but also by point contact or spherical contact.

  Since the leaf spring 14 and the contact member 15 are held by friction caused by the pressure of the leaf spring 14, the trunnion 3 is prevented from coming off in the axial direction. The trunnion 3 supported by the land portion 8 can be prevented from slipping out toward the tip end side by fitting a retaining ring to the outer periphery of the tip end of the trunnion 3.

  The anti-vibration sliding type constant velocity joint of Example 1 is configured as described above, and the tripod member 2 slides with respect to the outer ring 1 while taking an operating angle θ (see FIG. 1) within a predetermined range. Transmits constant speed rotation. At this time, the leaf spring 14 constitutes the universal contact portion 10 with the contact member 15 and presses the contact member 15 against the inner diameter surface of the roller 4 to support it. The trunnion 3 of the tripod member 2 does not directly contact the roller 4 due to the presence of the non-contact portion 12, and contacts the roller 4 only through the leaf spring 14 and the contact member 15. Therefore, the vibration transmitted between the tripod member 2 and the outer ring 1 always passes through the leaf spring 14 and is suppressed or blocked by its elasticity.

  Further, when a radial overload acts between the outer ring 1 and the tripod member 2, the interference projection 13 of the trunnion 3 interferes with the inner diameter surface of the roller 4, as indicated by a one-dot chain line in FIG. 3. Therefore, the load is prevented from acting on the leaf spring 14 any more. Although FIG. 3 shows the case where the trunnion 3 moves relatively to the left, the same applies to the case where it moves to the right.

  Since the basic structure of the vibration-proof sliding constant velocity joint of the second embodiment shown in FIGS. 4 to 6 is the same as that of the first embodiment, the differences will be mainly described. The difference is in the support structure of the roller 4 in the trunnion 3. That is, the trunnion 3 in this case is formed with a contact plane 16 having two flat surfaces parallel to the track groove 5 as shown in FIG.

  That is, in each trunnion 3, a cross section including the center point O and the center axis of the tripod member 2 is defined as a reference cross section B (see FIG. 6), and contact planes 16 are formed on both sides of the reference cross section B. The outer peripheral surface of the trunnion 3 between the two contact planes 16 is a non-contact surface 12 that does not contact the inner diameter surface of the roller 4 in view of its axial cross-sectional shape.

  A contact member 17 is disposed to face each of the contact planes 16. A recess 18 is formed on the surface of the contact member 17 facing the contact plane 16. Interference projections 19 facing the contact plane 16 are provided at two locations on both sides of the trunnion 3 in the radial direction of the recess 18.

  A leaf spring 20 as a vibration absorbing member is housed on the bottom surface of the recess 18, and a universal contact portion 10 is formed by contact between the leaf spring 20 and the contact plane 16, and each contact member is the leaf spring 20. Is urged outward in the radial direction and pressed against the inner surface of the roller 4.

  As described above, the second embodiment is the same as the first embodiment except that the support structure of the leaf spring 20 is different. Therefore, the operation as a constant velocity joint is the same. Further, since the leaf spring 20 is necessarily interposed in the middle of the vibration transmission path between the tripod member 2 and the outer ring 1 due to the presence of the non-contact portion 12, it is suppressed and attenuated by its elasticity. Further, when an excessive load is applied, the contact plane 16 of the trunnion 3 comes into contact with the interference projection 19 of the contact member 17 as indicated by the one-dot chain line in FIG. It is prevented from acting.

Sectional view of Example 1 Sectional view taken along line X1-X1 in FIG. Sectional drawing of the Y1-Y1 line of FIG. Partially omitted sectional view of Example 2 Sectional view taken along line X2-X2 in FIG. Section of line Y2-Y2 in FIG.

Explanation of symbols

Reference Signs List 1 outer ring 2 tripod member 3 trunnion 4 roller 5 track groove 6 outer ring shaft 7 boss portion 8 land portion 9 tripod shaft 10 free contact portion 11 recess 12 non-contact portion 13 interference projection 14 leaf spring 15 contact member 16 contact plane 17 contact member 18 recess 19 interference projection 20 leaf spring

Claims (4)

The outer ring (1), the tripod member (2) housed inside the outer ring (1), and the three trunnions (3) of the tripod member (2) were supported via the universal contact portion (10), respectively. The tripod member (2) comprises a roller (4), and the roller (4) is slidably and slidably accommodated in a track groove (5) formed in the axial direction on the inner diameter surface of the outer ring (1). In the vibration-proof sliding type constant velocity joint in which the vibration absorbing member is interposed in the middle of the vibration transmission path between the outer ring (1) and the outer ring (1),
Concave portions (11) open to the outer diameter surface of the trunnion (3) are formed at two locations that belong to the axial section of the tripod member (2) and are symmetrical with respect to the axial section of the trunnion (3) itself, A non-contact surface (12) that does not contact the inner diameter surface of the roller (4) is formed on the outer peripheral surface of the trunnion (3) between the both recesses (11), and both end portions of the non-contact surface (12) and the respective recesses Interference projections (13) are formed between the side walls of (11), and the metal leaf springs (14) as the vibration absorbing members are housed on the bottom surfaces of the recesses (11). The contact member (15) forming the universal contact portion (10) at the contact portion with the leaf spring (14) is housed in a free state in the radial direction of the trunnion (3), and the roller (4) The inner diameter is formed larger than the center distance of the interference protrusion (13). , Said contact member (15) is vibration-proof sliding type constant velocity joint, characterized in that pressed against the inner surface of the roller is urged in the plate radially outwardly by a spring (14) (4).   The anti-vibration slide according to claim 1, wherein the universal contact portion (10) is configured by contact between a curved protrusion of the leaf spring (14) and a flat surface of the contact member (15). Type constant velocity joint. The outer ring (1), the tripod member (2) housed inside the outer ring (1), and the three trunnions (3) of the tripod member (2) were supported via the universal contact portion (10), respectively. The tripod member (2) comprises a roller (4), and the roller (4) is slidably and slidably accommodated in a track groove (5) formed in the axial direction on the inner diameter surface of the outer ring (1). In the vibration-proof sliding type constant velocity joint in which the vibration absorbing member is interposed in the middle of the vibration transmission path between the outer ring (1) and the outer ring (1),
In each trunnion (3), a cross section including the center point and the central axis of the tripod member (2) is defined as a reference cross section (B), and contact planes (16) are formed on both sides of the reference cross section (B), A non-contact surface (12) that does not contact the inner diameter surface of the roller (4) is formed on the outer peripheral surface of the trunnion (3) between both contact planes (16), and a contact member ( 17) is disposed, and a concave portion (18) is formed on the opposed surface of the contact member (17), and the interference protrusion is opposed to the contact plane (16) on both sides of the trunnion (3) in the radial direction of the concave portion (18). (19) is provided, and a metal leaf spring (20) as the vibration absorbing member is accommodated in the bottom surface of the recess (18), and the leaf spring (20) and the contact plane (16) By the contact of A vibration isolator characterized in that a portion (10) is formed, and each contact member (17) is urged radially outward by the leaf spring (20) and pressed against the inner surface of the roller (4). Sliding type constant velocity joint.   The said universal contact part (10) was comprised by the contact of the curved protrusion part of the said leaf | plate spring (20), and the contact plane (16) formed in the said trunnion (3), Anti-vibration sliding type constant velocity joint as described in 1.

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