JP2020143706A - Torsional damper - Google Patents

Abstract

To provide a highly durable and reliable torsional damper capable of absorbing and damping vibration which is generated in the case of torque transmission, for a long time by suppressing a change in compressibility of elastic members.SOLUTION: A torsional damper 1 comprises: a pair of annular inertia mass members 3A and 3B; a pair of annular elastic members 4A and 4B disposed between both sides of a hub plate 2 and between the pair of inertia mass members 3A and 3B; and a junction part 5 which joins both outer peripheral parts 3a and 3b of the pair of inertia mass members 3A and 3B while mutually restricting them in an axial direction, compresses and holds the pair of elastic members 4A and 4B between both the sides of the hub plate 2. The junction part 5 includes a caulked part 7 resulting from bending the outer peripheral part 3a which is positioned radially outside in the outer peripheral parts 3a and 3b of the pair of inertia mass members 3A and 3B, in the axial direction, then folding and caulking them at a central side in the radial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a torsional damper, and more particularly to a torsional damper used for an internal combustion engine of an automobile, a truck, a bus, a construction machine, an industrial machine, or the like.

Patent Document 1 discloses a torsional rubber damper in which first and second elastic members are compressed and sandwiched between a hub and first and second inertial mass members, respectively. In this torsional rubber damper, the first and second inertial mass members are fixed to each other by fitting or the like.

Japanese Unexamined Patent Publication No. 2016-33411

The compressibility of the pair of elastic members consisting of the first and second members is determined by their thickness and the distance from the hub to the pair of inertial mass members consisting of the first and second members. When the compressive reaction force of the pair of elastic members is greater than or equal to the bonding force between the pair of inertial mass members, the pair of inertial mass members are separated from each other in the direction in which the compression of the pair of elastic members is released, that is, the pair of inertial mass members. The mass members move so as to open each other in the axial direction, and the compressibility of the pair of elastic members decreases.

Therefore, torque is transmitted from the rotating shaft to the transmitted member by suppressing the change in the compression ratio of the pair of elastic members at the joint where the outer peripheral portions of both of the pair of inertial mass members are restrained and joined in the axial direction. There is a demand for a highly durable and reliable torsional damper capable of absorbing and damping various vibrations (twisting vibration and vertical vibration) generated during a long period of time.

The present invention has been made in view of such a problem, and an object of the present invention is to absorb vibration generated during torque transmission for a long period of time by suppressing a change in the compressibility of an elastic member. The purpose is to provide a durable and reliable torsional damper that can be damped.

In order to achieve the above object, the torsional damper of the present invention is arranged on a hub plate to which the rotation axis can be attached so that the rotation centers are aligned with each other and on the outer peripheral portions of both sides extending in the radial direction of the hub plate. Axial directions of the outer peripheral portions of both the pair of annular inertial mass members, the pair of annular elastic members arranged between both sides of the hub plate and the pair of inertial mass members, and the pair of inertial mass members. The joints are provided with joints that are restrained from each other and sandwiched between both sides of the hub plate by compressing each pair of elastic members, and the joints are in the radial direction of the outer peripheral portions of the pair of inertial mass members. Includes a crimped portion that is bent in the axial direction and then folded back to the center side in the radial direction for crimping.

According to the torsional damper of the present invention, by suppressing the change in the compressibility of the elastic member, the vibration generated at the time of torque transmission can be absorbed and damped for a long period of time, and the durability and reliability can be improved. Can be enhanced.

It is a top view of the torsional damper which concerns on 1st Embodiment of this invention. It is a vertical sectional view of the torsional damper of FIG. It is an enlarged view of the joint part of the conventional torsional damper. It is an enlarged view of the joint part of the torsional damper of FIG. It is a vertical sectional view of the torsional damper which concerns on 2nd Embodiment of this invention. It is an enlarged view of the joint part of the torsional damper of FIG. It is an enlarged view of the joint part of the torsional damper which concerns on 3rd Embodiment of this invention. It is an enlarged view of the joint part of the torsional damper which concerns on 4th Embodiment of this invention.

Hereinafter, the torsional damper according to each embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 shows a plan view of a torsional damper according to a first embodiment of the present invention. FIG. 2 shows a vertical cross-sectional view of the torsional damper of FIG. The torsional damper (hereinafter, may be abbreviated as a damper) 1 includes a hub plate 2, an inertial mass member 3, and an elastic member 4.

The hub plate 2 is made of metal and is formed in a disk shape by casting, forging, sheet metal, or the like. A shaft hole 2a through which a rotating shaft (not shown) such as an engine crankshaft or a camshaft can be inserted is formed in the radial center of the hub plate 2. A plurality of bolt holes 2b are formed around the shaft holes 2a, and bolts (not shown) can be inserted into these bolt holes 2b to bolt and attach a boss (not shown) to the hub plate 2. As a result, the rotating shaft is rotatably attached to the hub plate 2 and the damper 1 via the boss so as to coincide with the center of rotation.

When the end of the rotating shaft is formed in a flange shape, the rotating shaft can be directly bolted to the hub plate 2 without a boss. Further, thereafter, the axial direction of the rotating shaft, that is, the penetrating direction of the rotating shaft in the shaft hole 2a of the hub plate 2 is defined as the "axial direction", and the radial direction perpendicular to the rotating shaft, that is, the diameter extending on both sides of the hub plate 2. The direction is defined as the "radial direction", and the positive and negative rotation directions of the rotating shaft, that is, the circumferential direction of the hub plate 2 is defined as the "circumferential direction".

The inertial mass member 3 is made of metal and is formed in an annular shape by casting, forging, sheet metal, etc., and is composed of a pair of inertial mass members 3A and 3B (hereinafter, may be collectively referred to as inertial mass members 3). .. The pair of inertial mass members 3A and 3B are respectively arranged on the outer peripheral portions of both sides extending in the radial direction of the hub plate 2, and are swingable at least in the circumferential direction with respect to the rotation axis, preferably further on the rotation axis. On the other hand, it can swing in the radial direction (including the vertical direction as seen in FIGS. 1 and 2).

The elastic member 4 is a rubber ring having a function of so-called damper rubber, and is formed of a rubber material such as ethylene propylene rubber (EPDM) or a resin elastomer, and forms a pair of annular elastic members 4A and 4B (hereinafter, hereinafter, It is composed of (sometimes collectively referred to as an elastic member 4). The pair of elastic members 4A and 4B are arranged between both sides of the hub plate 2 and the pair of inertial mass members 3A and 3B, respectively.

The damper 1 is formed with a joint portion 5 that restrains and joins the outer peripheral portions of both of the pair of inertial mass members 3A and 3B in the axial direction. The joint portion 5 is formed as an annular outer edge of the damper 1, and a pair of elastic members 4A and 4B are compressed and sandwiched between both sides of the hub plate 2. Even if a fixing agent (not shown) is interposed between both sides of the hub plate 2 and the pair of elastic members 4A and 4B, or between the pair of inertial mass members 3A and 3B and the pair of elastic members 4A and 4B. good. By forming the joint portion 5, the pair of elastic members 4A and 4B are compressed, and the hub plate 2 and the pair of inertial mass members 3A and 3B are elastically connected.

The respective fixing methods between both sides of the hub plate 2 and the pair of elastic members 4A and 4B and the respective fixing methods between the pair of inertial mass members 3A and 3B and the pair of elastic members 4A and 4B are It is possible to fill the unmolded material of the elastic member 4 on the inertial mass member 3 and / or the hub plate 2 and bond them at the same time as molding (in the case of rubber, it corresponds to vulcanization bonding). Alternatively, fixing by a known method such as a post-bonding method in which the molded elastic member 4 is post-bonded is possible.

Preferably, it is preferable to use a post-bonding method in which the elastic member 4 can be fixed to the inertial mass member 3 and / or the hub plate 2 in a compressed state. As the fixing agent used in the present invention, a known adhesive or a vulcanized adhesive can be used. A silane coupling agent is preferable as a fixing agent for anti-vibration rubber such as natural rubber, NBR, and EPDM, which can be applied to the post-bond method.

The damper 1 configured in this way elastically connects the hub plate 2 mounted on the rotating shaft and the inertial mass member 3 with the elastic member 4. Therefore, the viscoelasticity of the elastic member 4 absorbs and attenuates various vibrations (twisting vibration and vertical vibration) generated when torque is transmitted from the rotating shaft to a member to be transmitted (not shown).

Here, the joint portion 5 of the present embodiment includes a fitting portion 6 and a crimping portion 7. The fitting portion 6 is formed by bending both outer peripheral portions 3a and 3b of the pair of inertial mass members 3A and 3B in the axial direction and fitting them together. The crimping portion 7 bends the outer peripheral portion 3a of the inertial mass member 3A located on the outer side in the radial direction of the outer peripheral portions 3a and 3b of the pair of inertial mass members 3A and 3B in the axial direction, and then this It is formed by folding back the outer peripheral portion 3a toward the center side in the radial direction and crimping it. The fitting portion 6 and the crimping portion 7 are both portions forming an annular shape in the circumferential direction of the damper 1.

FIG. 3 shows an enlarged view of the joint portion 5 of the conventional damper. The conventional joint portion 5 is formed only from the fitting portion 6, and the crimping portion 7 is not formed. Therefore, when the compressive reaction force of the pair of elastic members 4A and 4B exceeds the fitting force of the pair of inertial mass members 3A and 3B, the pair of inertial mass members 3A in the direction in which the compression of the pair of elastic members 4A and 4B is released. 3B are separated from each other, that is, the pair of inertial mass members 3A and 3B move so as to open each other in the axial direction indicated by the arrow, and the compressibility of the pair of elastic members 4A and 4B decreases. Then, the functions of vibration absorption and vibration damping by the elastic member 4 are deteriorated, and the performance of the damper is deteriorated.

FIG. 4 shows an enlarged view of the joint portion 5 of the damper 1 of FIG. In the joint portion 5 of the present embodiment, the fitting portion 6 is formed by bending both outer peripheral portions 3a and 3b of the pair of inertial mass members 3A and 3B in the axial direction and fitting them together. .. After that, a crimping portion 7 is further formed in which the end portion of the outer peripheral portion 3a protruding in the axial direction from the fitting portion 6 is folded back toward the center side in the radial direction (diagonally right direction in FIG. 4) indicated by an arrow.

In the joint portion 5, the outer peripheral portion 3b is constantly pressed by the crimping portion 7 in the axial direction indicated by the arrow (downward in FIG. 4), and the compression of the pair of elastic members 4A and 4B is compressed by the hub plate 2 and the pair of inertial masses. It is preferably performed between the members 3A and 3B. Therefore, the pair of inertial mass members 3A and 3B do not separate from each other in the direction in which the compression of the pair of elastic members 4A and 4B is released, that is, the pair of inertial mass members 3A and 3B are in the axial direction indicated by the arrow. Since they do not move so as to open each other, the compressibility of the pair of elastic members 4A and 4B is maintained in the state at the time of manufacture of the damper 1.

As described above, according to the damper 1 of the present embodiment, the pair of inertial mass members 3A, as compared with the case where only the fitting portion 6 is formed by forming the crimping portion 7 at the joint portion 5. The 3B bonding can be performed even more firmly. Moreover, the compression reaction force of the pair of elastic members 4A and 4B does not exceed the fitting force of the pair of inertial mass members 3A and 3B, and the change in the compressibility of the pair of elastic members 4A and 4B can be suppressed. Therefore, the vibration generated when torque is transmitted from the rotating shaft to the transmitted member can be absorbed and damped for a long period of time, and the durability and reliability of the damper 1 can be improved.

<Second Embodiment>
FIG. 5 shows a vertical cross-sectional view of the damper 1 according to the second embodiment of the present invention, and FIG. 6 shows an enlarged view of the joint portion 5 of the damper 1 of FIG. In the following description, the same configuration as that of the first embodiment will be omitted by adding the same reference numerals to the drawings, and the configuration different from that of the first embodiment will be mainly described. The same shall apply in the description of other embodiments.

The damper 1 of the present embodiment further includes positioning means for positioning the pair of inertial mass members 3A and 3B by defining the distance between the pair of inertial mass members 3A and 3B in the axial direction. Specifically, the positioning means of the present embodiment fits the outer peripheral portion 3b of the inertial mass member 3B located on the inner side in the radial direction of the outer peripheral portions 3a and 3b of the pair of inertial mass members 3A and 3B. It is realized by the abutting portion 8 which extends from the above and abuts against the opposing inertial mass member 3A.

The abutting portion 8 is an end portion of the outer peripheral portion 3b protruding in the axial direction from the fitting portion 6, and is formed as a portion forming an annular shape in the circumferential direction of the damper 1. By having the abutting portion 8 stretch the outer peripheral portion 3b of the inertial mass member 3B in the axial direction indicated by the arrow in FIG. 6, the fitting jig is misaligned and the crimping portion 7 is formed when the fitting portion 6 is formed. As a result, the pair of inertial mass members 3A and 3B are not excessively close to each other in the axial direction, and the pair of elastic members 4A and 4B are not excessively compressed. This makes it possible to maintain the compressibility of the pair of elastic members 4A and 4B constant as originally designed.

Further, excessive compression does not easily promote the settling of the pair of elastic members 4A and 4B. Therefore, while more preferably suppressing the change in the compressibility of the pair of elastic members 4A and 4B, the vibration generated when torque is transmitted from the rotating shaft to the transmitted member is more preferably absorbed and damped over a long period of time. This makes it possible to further improve the durability and reliability of the damper 1.

<Third Embodiment>
FIG. 7 shows an enlarged view of the joint portion 5 of the damper 1 according to the third embodiment of the present invention. Similar to the case of the second embodiment, the damper 1 of the present embodiment provides positioning means for positioning the pair of inertial mass members 3A and 3B by defining the axial separation distance of the pair of inertial mass members 3A and 3B. I have. The positioning means of the present embodiment is realized by a pin member 9 extending between a pair of inertial mass members 3A and 3B.

The pin member 9 is formed of a fixing portion 9a fixed to an inertial mass member 3A located on the outer side in the radial direction by fitting or the like, and a pin portion 9b extending axially from the fixing portion 9a. The pin portion 9b is abutted against the inertial mass member 3B located inside in the radial direction and facing the fixing portion 9a. Although one pin member 9 may be arranged, it is preferable to arrange a plurality of pin members 9, and it is preferable that these arrangements are along the circumferential direction of the damper 1.

The pin member 9 has the same function as the abutting portion 8 in the second embodiment, and the fitting jig may be misaligned when forming the fitting portion 6, or the crimping portion 7 may be displaced. The pair of elastic members 4A and 4B are not excessively compressed even when the above is formed. Further, the durability of the damper 1 is not impaired by the sagging of the pair of elastic members 4A and 4B. Therefore, the durability and reliability of the damper 1 can be improved as in the case of the second embodiment. The pin member 9 may be present only at the time of crimping and may be removed after that. Further, the pin member 9 may be formed as a portion extending from the manufacturing jig of the damper 1 and retracted after crimping.

<Fourth Embodiment>
FIG. 8 shows an enlarged view of the joint portion 5 of the damper 1 according to the fourth embodiment of the present invention. The damper 1 of the present embodiment includes the same positioning means as in the cases of the second and third embodiments. The positioning means of the present embodiment includes a step portion 10 provided on the inner peripheral surface of the outer peripheral portion 3a of the inertial mass member 3A located on the outer side in the radial direction and an outer peripheral portion 3b of the inertial mass member 3B located on the inner side in the radial direction. It is realized from the locking portion 11 formed at the end portion of the.

The step portion 10 and the locking portion 11 are formed as an annular portion in the circumferential direction of the damper 1, and by abutting the locking portion 11 against the step portion 10 and locking the damper 1, a pair of inertial mass members 3A and 3B Positioning is performed. In the case of the present embodiment, the fitting portion 6 does not exist, but the joint portion 5 is also formed by the above positioning.

This positioning means has the same function as the abutting portion 8 in the case of the second embodiment and the pin member 9 in the case of the third embodiment, and even if the crimping portion 7 is formed, the pair of elastic members 4A 4B is not excessively compressed, and the durability of the damper 1 is not impaired by the settling of the pair of elastic members 4A and 4B. Therefore, the durability and reliability of the damper 1 can be improved as in the case of the second and third embodiments. In particular, in the case of the present embodiment, since the joint portion 5 is formed by the crimping portion 7 and the positioning means and the fitting portion 6 does not have to be formed, the step for forming the fitting portion 6 is eliminated and the damper is eliminated. There is an advantage that the productivity of 1 is improved.

Although the description of the embodiment of the present invention is completed above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the joint portion 5 may be formed by the crimping portion 7 and the joining means other than the fitting portion 6. Further, the positioning means is not limited to the above-described embodiment as long as the pair of inertial mass members 3A and 3B are positioned by defining the distance between the pair of inertial mass members 3A and 3B in the axial direction.

1 Tortional damper 2 Hub plate 3, 3A, 3B Inertial mass member 3a, 3b Outer circumference of a pair of inertial mass members 4, 4A, 4B Elastic member 5 Joint part 6 Fitting part 7 Clamping part 8 Butt part (positioning) means)
9-pin member (positioning means)
10 Stepped part (positioning means)
11 Locking part (positioning means)

Claims (6)

A hub plate that can be attached with the axis of rotation aligned with its center of rotation,
A pair of annular inertial mass members arranged on the outer peripheral portions of both sides extending in the radial direction of the hub plate, and
A pair of annular elastic members arranged between both sides of the hub plate and the pair of inertial mass members, respectively.
Both outer peripheral portions of the pair of inertial mass members are restrained from each other in the axial direction and joined to each other, and the pair of elastic members are respectively compressed and sandwiched between both sides of the hub plate.
In the joint portion, the outer peripheral portion of the outer peripheral portion of the pair of inertial mass members located on the outer side in the radial direction is bent in the axial direction, and then folded back toward the center side in the radial direction and crimped. Tortional damper including the tightening part. The torsional damper according to claim 1, further comprising a positioning means for positioning the pair of inertial mass members by defining a separation distance in the axial direction of the pair of inertial mass members. The torsional damper according to claim 2, wherein the joint includes a fitting portion in which the outer peripheral portions of both of the pair of inertial mass members are bent in the axial direction and fitted to each other. The positioning means extends the outer peripheral portion of the pair of outer peripheral portions of the inertial mass member located inside the radial direction from the fitting portion, and abuts the abutting portion against the opposing inertial mass member. The torsional damper according to claim 3, which comprises. The torsional damper according to claim 3, wherein the positioning means comprises a pin member extending between the pair of inertial mass members. The positioning means
A step portion provided on the inner peripheral surface of the outer peripheral portion located on the outer side in the radial direction of the outer peripheral portions of the pair of inertial mass members.
The claim includes a locking portion that forms the joint portion by abutting and locking the outer peripheral portion of the pair of outer peripheral portions of the inertial mass members located inside the radial direction against the step portion. The torsional damper described in 2.