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CN-117307649-B - Vibration isolator

CN117307649BCN 117307649 BCN117307649 BCN 117307649BCN-117307649-B

Abstract

The invention provides a vibration isolation device with a novel structure, which can control vibration isolation characteristics with excellent energy efficiency by effectively applying magnetic force for control to an enclosed magnetic functional fluid. In a vibration isolation device (10) for controlling vibration isolation characteristics by applying magnetic force from a magnetic field generation means (56) to a throttle passage (40) that communicates fluid chambers (38, 38) in which a magnetically functional fluid (39) is enclosed, an intermediate tube member (24) in which an outer tube member (16) made of a nonmagnetic material is externally fitted and fixed is made of a ferromagnetic material, and a magnetic field application opening (32) is provided in the intermediate tube member (24) at a position corresponding to the throttle passage (40).

Inventors

  • HIRANO MASAAKI
  • KUME TAKASHI

Assignees

  • 住友理工株式会社

Dates

Publication Date
20260508
Application Date
20230103
Priority Date
20220627

Claims (5)

  1. 1. A vibration isolator (10, 80, 100, 110) is a fluid-filled vibration isolator (10, 80, 100, 110), wherein an inner shaft member (14) and an intermediate tube member (24) are connected by a main rubber elastic body (18), an outer tube member (16) is fixed to the intermediate tube member (24) in a casing, a pocket-like portion (34) provided in the main rubber elastic body (18) and opening on the outer peripheral side of the intermediate tube member (24) is covered by the outer tube member (16), thereby forming a plurality of fluid chambers (38) separated in the circumferential direction, and a throttle passage (40, 81, 112) for communicating the plurality of fluid chambers (38) is provided in the vibration isolator (10, 80, 100, 110), wherein, A magnetically functional fluid (39) is enclosed in the fluid chamber (38), A magnetic field generating means (56) is provided outside the fluid chamber (38), the magnetic field generating means (56) applying a magnetic field to the magnetically functional fluid (39) flowing through the orifice passage (40, 81, 112), The outer barrel member (16) is a non-magnetic material, The intermediate tubular member (24) is a ferromagnetic material, A magnetic field acting opening (32) is provided in the intermediate tube member (24) at a position corresponding to the throttle passage (40, 81, 112) for applying a magnetic field to the magnetic functional fluid (39), The intermediate tube member (24) has: A pair of axial side portions (29) formed in a large-diameter cylindrical shape continuous in the circumferential direction, and A groove-like axial intermediate portion which is provided locally in the circumferential direction and extends in the circumferential direction between the pair of axial side portions (29), The axial middle part is provided with the magnetic field action opening part (32), The intermediate tube member (24) is formed in a divided configuration on both sides in the axial direction at the axial direction intermediate portion, the pair of axial side portions (29) are independent members, The magnetic field acting opening (32) is formed between the axially separated divided portions of the axially intermediate portion.
  2. 2. The vibration isolator (10, 80, 100, 110) according to claim 1, wherein the magnetic field generating unit (56) is disposed on an outer peripheral side of the outer tube member (16).
  3. 3. The vibration isolator (10, 80, 100) according to claim 1, wherein a magnetic flux concentrating member (42) made of a ferromagnetic material is disposed opposite to the throttle passage (40, 81) in the width direction of the throttle passage (40, 81), and the magnetic field acting opening (32) in the intermediate tube member (24) is provided at a position corresponding to a position between the opposing portions in the magnetic flux concentrating member (42).
  4. 4. A vibration isolator (80) according to claim 3, wherein, Between the intermediate tube member (24) and the outer tube member (16), throttle members (82, 102) for forming the throttle passage (81) are disposed so as to extend in the circumferential direction at the opening portion of the pocket portion (34) provided in the main rubber elastic body (18), The throttle member (82, 102) is a ferromagnetic material, The magnetic flux concentrating members (42) disposed opposite to each other in the width direction of the throttle passage (81) are composed of the throttle members (82, 102).
  5. 5. The vibration isolator (10, 80, 100, 110) according to claim 1, wherein, The magnetic field generating unit (56) includes: a coil member which generates a magnetic field by energization, and A yoke member (60) that guides the magnetism in the magnetic field generated by the coil member to the throttle passage (40, 81, 112).

Description

Vibration isolator Technical Field The present invention relates to a fluid-filled vibration damping device that uses a fluid flow action or the like of a fluid filled in an internal fluid chamber, and more particularly, to a fluid-filled vibration damping device that uses a magnetically functional fluid whose flow characteristics or the like change due to a change in a magnetic field. Background Conventionally, as one type of vibration isolator, a fluid-filled vibration isolator having a structure in which an inner shaft member and an outer tube member are connected by a main rubber elastic body is known, and the vibration isolator exhibits a vibration isolator effect with respect to input vibration inputted between the inner shaft member and the outer tube member by a flow action of fluid filled in the isolator. Such fluid-filled vibration damping devices are not limited to engine mounts for vehicles, and can be widely used for cab mounts, differential mounts, suspension mounts, vibration damping bushings, and the like. However, since the vibration damping characteristics required for the vibration damping device also differ depending on the input vibration, the running state of the vehicle, and the like, it is preferable that the vibration damping characteristics obtained by the fluid flowing action can be controlled from the outside. Accordingly, japanese patent application laid-open No. 3-009139 (patent document 1) proposes an electric viscous fluid-filled vibration damping device that uses an electric viscous fluid whose viscosity changes by energization, and that can switch vibration damping characteristics by controlling energization to the electric viscous fluid. However, in the vibration damping device described in patent document 1, it is also necessary to provide an electrode for energization so as to be in contact with an electrically viscous fluid and supply power to the electrode from the outside, and therefore, the structure and the manufacturing are easy to be complicated. On the other hand, in german patent application publication 102011117749 (patent document 2), a vibration isolator using a magneto-viscous fluid whose viscosity varies according to the intensity of an applied magnetic field is proposed. Since the magnetic viscous fluid can be controlled by applying a magnetic field from the outside of the fluid chamber, it is not necessary to dispose the current-carrying electrode in the fluid chamber like the electro-viscous fluid, and the manufacturing of the structure of the vibration isolator can be simplified as compared with the electro-viscous fluid-sealed type. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 3-009139 Patent document 2 German patent application publication 102011117749 specification Disclosure of Invention Problems to be solved by the invention However, in the case where the magnetic field generating means for applying a magnetic field to the magneto-viscous fluid is provided outside the fluid chamber, it is difficult to efficiently apply the magnetic field generated by the magnetic field generating means to the magneto-viscous fluid. Specifically, for example, as shown in fig. 2 and 3 of patent document 2, it is conceivable to mount the magnetic field generating means on the outer peripheral surface of the outer tube member in a sleeve state. However, there are no problems such as insufficient vibration isolation characteristics as a target, and poor energy efficiency due to an excessive magnetic field generating capability required for the magnetic field generating means, because of the fact that the magnetic field generated by the magnetic field generating means is efficiently applied to the orifice passage of the magnetically viscous fluid enclosed in the fluid chamber. The present invention has been made to solve the above problems, and an object of the present invention is to provide a vibration isolation device of a new structure that can efficiently apply a magnetic field from a magnetic field generating unit to a magnetically viscous fluid enclosed in a fluid chamber, thereby enabling switching of vibration isolation characteristics with good energy efficiency. Means for solving the problems The preferred embodiments for grasping the present invention are described below, but the embodiments described below are exemplary embodiments, and not only can be appropriately combined with each other to be used, but also can be recognized and used as independently as possible for a plurality of components described in each embodiment, and can be appropriately combined with any of the components described in other embodiments. Thus, the present invention is not limited to the following embodiments, and various other embodiments can be realized. The first mode of the present invention is as follows. A vibration isolator in which an inner shaft member and an intermediate tube member are connected by a main rubber elastic body, an