JP2018204621A - Centrifugal pendulum type vibration controller - Google Patents

Abstract

To reduce a manufacturing cost while maintaining strength or finishing accuracy of a support body of a centrifugal pendulum type vibration controller.SOLUTION: A centrifugal pendulum type vibration controller is configured such that since a support body 14 rotating with torque from a rotational shaft 12 is divided into a first support body 14A positioned on a radially inward side and a second support body 14B positioned on a radially outward side, and an inertial mass body 16 is supported to the second support body 14B in a pendulum-oscillatable manner, the first support body 14A and the second support body 14B can be separately manufactured and assembled; and high strength or finishing accuracy is imparted only to the second support body 14B requiring strength or finishing accuracy, so that a finishing cost of the support body 14 can be more reduced than a case where the high strength or finishing accuracy is imparted to both of the first support body 14A and second support body 14B.SELECTED DRAWING: Figure 3

Description

  The present invention includes a support that rotates in response to torque from a rotating shaft, and a plurality of inertial masses that are spaced apart from each other in the circumferential direction on an outer peripheral portion of the support, and the inertial masses are the support The present invention relates to a centrifugal pendulum type damping device that exerts a damping action by pendulum vibration with respect to a body.

  In such a centrifugal pendulum type vibration damping device, a pin is slidably fitted to a first curved track provided on a support that rotates together with the rotary shaft and a second curved track provided on an inertial mass body so that the rotary shaft rotates. Japanese Patent Application Laid-Open Publication No. 2004-228707 discloses a vibration damping function by pendulum vibration of an inertial mass body with respect to a support according to fluctuations.

Japanese Patent No. 5881130

  By the way, in the above-mentioned conventional one, the pin slides along the first curved track formed on the support, and the centrifugal force of the inertia mass body acts on the first curved track through the pin. High strength and machining accuracy are required in the vicinity of the first curved track. When heat treatment such as carburizing is performed to increase the strength of the support, it is necessary to perform machining to remove distortion caused by the heat treatment. However, there is a problem that causes an increase in cost if the entire support is heat treated and machined. is there. In addition, when surface treatment is performed to prevent rust and corrosion of the support, if the entire surface of the support is to be subjected to surface treatment, a large surface treatment device is required, or the number of supports that can be treated at one time is limited. Since there is a decrease, there is still a problem that causes an increase in cost.

  The present invention has been made in view of the above circumstances, and an object thereof is to reduce the manufacturing cost while maintaining the strength and processing accuracy of the support of the centrifugal pendulum type vibration damping device.

  In order to achieve the above object, according to the first aspect of the present invention, the support body that rotates by receiving torque from the rotating shaft and the outer peripheral portion of the support body are spaced apart in the circumferential direction. A centrifugal pendulum type damping device that exhibits a damping action by virtue of pendulum vibration of the inertial mass body with respect to the support body, wherein the inertial mass body is radially inward A centrifugal pendulum damping device is proposed, which is divided into a first support body and a second support body on the outer side in the radial direction, and the inertia mass body is supported by the second support body so as to be capable of pendulum vibration. The

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first support and the second support are subjected to different heat treatments. A vibration device is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the second support is divided into the same number as the number of the inertia mass bodies, A centrifugal pendulum type vibration damping device is proposed in which the inertial mass body is supported on a second support body so as to be capable of pendulum vibration.

  The main shaft 12 of the embodiment corresponds to the rotating shaft of the present invention, and the secondary flywheel 14 of the embodiment corresponds to the support body of the present invention.

  According to the configuration of claim 1, the support body of the centrifugal pendulum damping device is divided into the first support body on the radially inner side and the second support body on the radially outer side, and the inertia mass body is formed into the second support body. Since it is supported so as to be able to vibrate the pendulum, the first support and the second support can be manufactured and assembled separately, and the high strength and processing specialized for the second support requiring strength and processing accuracy. By giving accuracy, the processing cost of the support can be reduced as compared with the case where high strength and processing accuracy are given to both the first support and the second support.

  According to the second aspect of the present invention, since the first support and the second support are subjected to different heat treatments, only the heat treatment necessary for the first support is performed on the first support, and the second support is performed. By performing only the heat treatment necessary for the second support on the body, the processing cost of the support can be reduced while satisfying the performance required for the first support and the performance required for the second support. it can.

  Further, according to the configuration of claim 3, the second support is divided into the same number as the number of the inertia mass bodies, and the inertia mass bodies are supported on each second support body so that the pendulum can vibrate. By reducing the size of each second support and facilitating the processing, the processing cost of the support can be further reduced.

It is a schematic diagram of the damper arrange | positioned between an engine and a transmission. (First embodiment) FIG. 2 is a view taken along line 2-2 in FIG. 1. (First embodiment) FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. (First embodiment) FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. (First embodiment) It is a perspective view of a 2nd support body and an inertial mass body. (First embodiment) FIG. 3 is a diagram corresponding to FIG. 2. (Second Embodiment) FIG. 3 is a diagram corresponding to FIG. 2. (Third embodiment) FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. (Third embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a damper D disposed between a crankshaft 11 of an automobile engine E and a main shaft 12 of a transmission T is connected to a primary flywheel 13 connected to the crankshaft 11 and the main shaft 12. The secondary flywheel 14 and a plurality of springs 15 that connect the primary flywheel 13 and the secondary flywheel 14. The secondary flywheel 14 constituting the support body of the present invention is provided with four inertia mass bodies 16 acting as centrifugal pendulums, and the secondary flywheel 14 and the inertia mass bodies 16 are centrifugal pendulum type controls. Construct a vibration device.

  2 to 5, the secondary flywheel 14 is a disk-like member connected to the main shaft 12 at the center, and has four fan-like inertial mass bodies 16 on the outer periphery thereof. Supported at 90 ° intervals. The four inertia mass bodies 16 have the same structure, and the first half body 17 and the second half body 18 are integrally formed by three stepped rivets 19, 19, 20 so as to have a predetermined distance from each other. Composed and configured. Cylindrical stopper rubbers 21 and 21 are provided on the outer circumferences of the two rivets 19 and 19 positioned at both ends of the inertia mass body 16. A pair of arc-shaped second curved tracks 23A and 23B that are curved inwardly in the radial direction pass through two positions of the first half 17 and the second half 18 of the inertia mass body 16, respectively.

  The secondary flywheel 14 includes a plate-like first support body 14A located on the radially inner side and a plate-like second support body 14B located on the radially outer side, the outer periphery of the first support body 14A and the first support body 14A. 2 The inner periphery of the support 14B is superposed and fastened integrally with eight rivets 25. The second support 14B is partitioned into four regions having a central angle of 90 °, and one inertia mass body 16 is supported in each region. A pair of arc-shaped first curved tracks 22A and 22B that are curved outwardly in the radial direction penetrate each region of the secondary flywheel 14. The groove widths of the second curved tracks 23A and 23B of the inertial mass body 16 are set smaller than the groove width of the first curved tracks 22A and 22B of the secondary flywheel 14.

  The inertia mass body 16 is supported so that the first half body 17 and the second half body 18 sandwich the second support body 14B of the secondary flywheel 14, and at this time, the rivets at both ends of the inertia mass body 16 are supported. In order to avoid interference with 19, 19, notches 14a, 14a are formed at both ends of the outer periphery of each region of the second support 14B to avoid interference with the rivet 20 at the center of the inertial mass body 16. Therefore, a notch 14b is formed at the center of each region of the second support 14B.

  Each of the pair of pins 24 and 24 that swingably support the inertial mass body 16 on the second support body 14B of the secondary flywheel 14 has a central large diameter portion 24a and small diameter portions 24b and 24b at both ends. The large-diameter portions 24a, 24a at the center of the pair of pins 24, 24 are slidably fitted to the first curved tracks 22A, 22B of the second support 14B, and the pair of pins 24, A small-diameter portion 24b, 24b at one end of 24 is slidably fitted to the second curved tracks 23A, 23B of the first half 17 of the inertia mass body 16, and a small-diameter portion at the other end of the pair of pins 24, 24 24b and 24b are slidably fitted to the second curved tracks 23A and 23B of the second half 18 of the inertial mass body 16.

  Since the second support body 14B of the secondary flywheel 14 supports the inertial mass bodies 16 ..., high strength and processing accuracy are required for the first support body 14A. A heat treatment such as treatment is performed. Since thermal distortion occurs in the second support 14B that has been subjected to carburizing treatment, the dimensional accuracy can be increased by performing machining such as cutting on the second support 14B. The second support body 14B thus manufactured is fastened to the first support body 14A with rivets 25.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  The rotational angular velocity of the crankshaft 11 of the engine E is not constant, but decreases in the compression stroke and increases in the expansion stroke. Therefore, vibration with a frequency proportional to the engine speed is generated. The vibration of the crankshaft 11 is suppressed by expansion and contraction of springs 15 disposed between the primary flywheel 13 and the secondary flywheel 14 of the damper D, and an inertia mass body provided on the secondary flywheel 14. Damped by 16 ... pendulum movement.

  That is, a general pendulum is vibrated by being urged downward in the vertical direction by gravity, but the inertia mass body 16 of the centrifugal pendulum damping device is vibrated by being urged radially outward by centrifugal force, By making the natural vibration frequency of the inertia mass bodies 16... Match the vibration frequency of the engine E to be damped, the vibration damping function as a dynamic damper can be exhibited.

  Now, when the inertial mass body 16 supported by the second support body 14B of the secondary flywheel 14 via the pins 24 and 24 performs a pendulum motion, the pins 24 and 24 are connected to the first curved track 22A of the second support body 14B. , 22B, the wear of the first curved tracks 22A, 22B may be accelerated, but the first curved track 22A, 22B, The wear of 22B is suppressed and durability is improved.

  In this case, if the first support body 14A and the second support body 14B of the secondary flywheel 14 are configured as a single member, the secondary flywheel 14 is subjected to a heat treatment and then the secondary flywheel 14 is removed in order to remove thermal distortion. The entire wheel 14 needs to be machined, and there is a problem that a large heat treatment furnace is required and the amount of machining increases, resulting in an increase in manufacturing cost. However, according to the present embodiment, the secondary flywheel 14 is divided into the first support body 14A and the second support body 14B, and only the second support body 14B that supports the inertia mass bodies 16 ... is heat-treated and machined. Thus, the manufacturing cost can be reduced while ensuring the strength and dimensional accuracy of the second support 14B.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, the second support 14B of the first embodiment is divided into four for each region. As a result, the size of each of the second support bodies 14B... Becomes one-fourth that of the first embodiment, and the manufacture thereof becomes easier.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  The third embodiment is a modification of the second embodiment, and the four second supports 14B... Are set to the minimum dimensions that surround the outer circumferences of the first curved tracks 22A, 22B. Each second support 14B is fastened by five rivets 26 with the thin-walled portion 14c formed at the radially inner portion thereof overlapped with the radially outer portion of the first support 14A. Therefore, the thickness t of the edge portions of the first curved tracks 22A and 22B of the second support 14B is thinner at the radially inner portion than at the radially outer portion.

  However, during the operation of the centrifugal pendulum damping device, a radially outward centrifugal force acts on the inertial mass body 16, and the pins 24 and 24 are strongly pressed against the radially outer portions of the first curved tracks 22A and 22B. Therefore, in this portion, the second support 14B has a sufficient thickness t, thereby preventing a decrease in durability due to wear of the second support 14B.

  According to the third embodiment, since the dimensions of the second support bodies 14B are minimized, the manufacturing cost can be greatly reduced.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the rotating shaft of the present invention is not limited to the main shaft 12 of the transmission T according to the embodiment.

  Moreover, the support body of this invention is not limited to the secondary flywheel 14 of the damper D of embodiment.

  In the embodiment, the inertial mass body 16 is supported on the second support 14B via the first curved tracks 22A and 22B, the second curved tracks 23A and 23B, and the pin 24, but the inertia with respect to the second support 14B. The method of supporting the mass body 16 is arbitrary.

  The number of inertia mass bodies 16 is not limited to four in the embodiment.

  In the embodiment, only the second support 14B is subjected to heat treatment, but the first support 14A may be subjected to heat treatment different from that of the second support 14B.

12 Main shaft (rotating shaft)
14 Secondary flywheel (support)
14A 1st support body 14B 2nd support body 16 Inertial mass body

Claims (3)

A support body (14) that rotates by receiving torque from the rotating shaft (12), and a plurality of inertia mass bodies (16) that are arranged on the outer periphery of the support body (14) so as to be spaced apart in the circumferential direction. A centrifugal pendulum damping device that exhibits a damping action by the inertial mass body (16) pendulum vibrating with respect to the support body (14),
The support body (14) is divided into a first support body (14A) radially inward and a second support body (14B) radially outward, and the inertia mass body (16) is divided into the second support body (14B). ) Is supported so as to be capable of pendulum vibration.   The centrifugal pendulum type vibration damping device according to claim 1, wherein the first support (14A) and the second support (14B) are subjected to different heat treatments. The second support (14B) is divided into the same number as the number of the inertial mass bodies (16), and the inertial mass body (16) is capable of pendulum vibration on each of the second support bodies (14B). The centrifugal pendulum type vibration damping device according to claim 1 or 2, characterized by being supported.

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