WO2012002535A1

WO2012002535A1 - Torque rod and engine unit

Info

Publication number: WO2012002535A1
Application number: PCT/JP2011/065183
Authority: WO
Inventors: 英樹菅原; 植木　哲
Original assignee: 株式会社ブリヂストン
Priority date: 2010-07-02
Filing date: 2011-07-01
Publication date: 2012-01-05
Also published as: JP2012013192A; JP5695851B2

Abstract

Disclosed is a torque rod wherein at one end of a rod main body, there is provided a first bushing equipped with a mounting section which is mounted on either a vibration generating section or a vibration receiving section, and a main body elastic element which elastically connects together the mounting section and the rod main body, and wherein at the other end of the rod main body, there is provided a second bushing which is mounted on either the vibration generating section or the vibration receiving section, whichever is other than the one whereon the mounting section is mounted. This torque rod is such that there is provided a liquid filling mechanism which comprises a liquid chamber charged with filled liquid, and a liquid filling elastic element which forms a portion of the wall section of the liquid chamber; that the liquid chamber is partitioned into an auxiliary liquid chamber, and a main liquid chamber located on the liquid filling elastic element side; that in the liquid filling mechanism, there is formed a restricted passage which establishes communication between the main liquid chamber and the auxiliary liquid chamber; that a link section is protrusively provided in either the liquid filling elastic element or the first bushing; and that the tip of the link section is made to separably abut either the liquid filling elastic element or the first bushing, whichever is other than the one wherein the link section is provided.

Description

Torque rod and engine unit

The present invention relates to a liquid-sealed torque rod and an engine unit using the torque rod.
This application claims priority based on Japanese Patent Application No. 2010-152337 for which it applied to Japan on July 2, 2010, and uses the content here.

Conventionally, as an engine unit mounted on a vehicle, for example, a configuration in which an engine is supported by a pendulum suspension engine mount system as shown in Patent Document 1 below has been proposed. This pendulum suspension engine mount system includes a pair of engine mounts disposed on both sides of the engine's inertial spindle direction to support the engine load, and interposed between the engine and the vehicle body in the engine roll direction. This is a mounting system that supports the engine at three points by a torque rod that suppresses vibration.

Conventionally, as a torque rod, for example, a liquid-sealed torque rod as shown in Patent Document 2 below has been proposed. The torque rod is provided with a first bush attached to one of a vibration generating portion and a vibration receiving portion at one end of the rod main body, and the vibration generating portion and vibration receiving at the other end of the rod main body. A second bush attached to either one of the two parts is provided, and a liquid sealing mechanism having a liquid chamber in which a sealing liquid is sealed is provided in an intermediate part of the rod body. The liquid chamber described above is partitioned into a main liquid chamber and a sub liquid chamber, and an orifice passage (restriction passage) that connects the main liquid chamber and the sub liquid chamber is formed in the liquid sealing mechanism.

Conventionally, as an engine mount, there has been proposed an engine mount in which a mounting member and an elastic body have a separate structure, as shown in Patent Document 3 below, for example. The engine mount includes a first attachment member attached to the power unit (engine) via the power unit side bracket, a cylindrical second attachment member attached to the body (vehicle body) via the body side bracket, and a first attachment member. And an elastic body that elastically connects the second mounting member. And the above-mentioned 1st attachment member is contact | abutted with respect to the elastic body so that separation | spacing is possible. According to the engine mount, since the first mounting member and the elastic body are separated from each other when a large input is applied in the direction opposite to the direction of the initial load (rebound direction), the elastic body is prevented from being pulled and the elastic body is durable. Can be suppressed.

Japanese Patent Laid-Open No. 10-114226 JP 2005-291448 A JP 2005-23972 A

When the above-mentioned conventional torque rod is used in the above-described pendulum suspension engine mount system, liquid column resonance occurs in the orifice passage of the liquid seal mechanism when idling vibration is input, and the spring constant of the torque rod in the idling vibration region decreases. (Lower spring) and idle vibration transmitted to the vehicle body can be reduced. However, when high-frequency vibration in the booming sound region (about 100 to 200 Hz) is input, the orifice passage of the liquid seal mechanism is clogged, the torque constant of the torque rod increases, and the high-frequency vibration described above is applied to the vehicle body. There is a problem of being easily transmitted.

The present invention takes the above-described conventional problems into consideration, and a torque rod and an engine unit that can improve vibration transmission characteristics in an idle vibration area without deteriorating vibration transmission characteristics in a booming sound area. The purpose is to provide.

The torque rod according to the present invention includes an attachment portion attached to one of a vibration generating portion and a vibration receiving portion at one end portion of the rod body, and a body that elastically connects the attachment portion and the rod body. In the torque rod provided with a first bush including an elastic body, and provided with a second bush attached to either one of the vibration generating portion and the vibration receiving portion at the other end of the rod body, A liquid sealing mechanism having a liquid chamber in which a sealing liquid is sealed and a liquid sealing elastic body constituting a part of a wall portion of the liquid chamber is provided, and the liquid chamber is a main liquid chamber on the liquid sealing elastic body side. A restriction passage is formed in the liquid sealing mechanism to communicate the main liquid chamber and the auxiliary liquid chamber, and any one of the liquid sealing elastic body and the first bush A linkage portion is provided on one of the projections, and the linkage is Tip of is separably contact the other one of said liquid seal elastic member and the first bushing.

Due to such characteristics, when vibration of the vibration generating unit is input, the main body elastic body is elastically deformed, the main body elastic body acts as a vibration absorbing main body, and vibration is generated by a vibration absorbing action based on internal friction of the main body elastic body. The vibration that is absorbed and transmitted from the vibration generating unit to the vibration receiving unit via the torque rod is reduced. At this time, when the vibration of the vibration generating part is idle vibration, the tip of the linkage part is in contact with the liquid seal elastic body or the first bush, so that the liquid seal elastic body is elastically deformed by the input of the idle vibration. . At this time, the liquid in the liquid chamber travels between the main liquid chamber and the sub liquid chamber through the restriction passage according to the elastic deformation of the liquid seal elastic body, and liquid column resonance occurs in the liquid flowing through the restriction passage. Arise. Due to this liquid column resonance, the torque rod is lowered, the idle vibration input to the torque rod is attenuated, and the idle vibration transmitted to the vibration receiving portion side is reduced.

Further, when at least one of the vibration generating portion and the vibration receiving portion is displaced in a direction in which the first bush and the second bush are separated from each other, the distal end portion of the linkage portion is separated from the liquid seal elastic body or the first bush, A liquid seal mechanism is separated from the first bush. As a result, the lowering of the spring due to the liquid column resonance described above is avoided, and the vibration is absorbed based on the characteristics of the main body elastic body, so that the vibration transmission characteristics in the booming sound region do not deteriorate.

In addition, a configuration in which a liquid sealing mechanism is disposed on one side of the first bush and a second bush is disposed on the other side, that is, the liquid sealing mechanism, the first bush, and the second bush are arranged in parallel in this order. In the case of the configuration described above, the center of gravity of the torque rod is located closer to the liquid sealing mechanism, so that the pitching movement is increased.
Therefore, in the torque rod according to the present invention, it is preferable that the liquid sealing mechanism is disposed in a portion of the rod body between the first bush and the second bush.
Thereby, since the gravity center position of a torque rod becomes near the center of the longitudinal direction of a rod main body, pitching is suppressed.

In the torque rod according to the present invention, the main body elastic body includes a pair of elastic legs arranged symmetrically with respect to the axial extension line of the linkage part, and the pair of elastic legs includes: It is preferable to extend in a direction extending from the mounting portion toward the opposite side of the linkage portion.
Accordingly, when the idle vibration is input, the attachment portion is pressed from three directions by the pair of elastic leg portions and the linkage portion, so that the vertical and horizontal movements are stabilized.

The torque rod according to the present invention includes a first rod member provided with the liquid seal mechanism and a second rod member provided with the first bush on the rod body, By joining the first rod member and the second rod member, the distal end portion of the linkage portion is brought into pressure contact with either the liquid seal elastic body or the first bush, and the main body elastic body and the It is preferable that at least one of the liquid seal elastic bodies is pre-compressed.
As a result, the tip of the linkage portion is in a state of reliably contacting the liquid seal elastic body or the first bush during idle vibration.

In the torque rod according to the present invention, it is preferable that the liquid sealing mechanism is offset so that the central axis of the liquid sealing mechanism is parallel to the central axis of the rod main body with a space therebetween.
As a result, the liquid sealing mechanism is separated from the interference line, and interference between the torque rod and peripheral devices or the vehicle body is prevented.

An engine unit according to the present invention is interposed between the engine, a pair of engine mounts disposed on both sides of the engine in the principal axis direction of the engine to support the load of the engine, and the engine and the vehicle body. A torque rod that suppresses vibration in the roll direction of the engine, wherein the engine includes a two-cylinder engine, and the torque rod according to the present invention described above is provided as the torque rod. It is preferable that

In a two-cylinder engine, the main component of engine vibration during idling is the primary rotational component. However, when a two-cylinder engine is mounted with a pair of engine mounts and a torque rod (so-called pendulum suspension engine mount system), the idling described above is performed. The frequency of the primary rotational component at the time and the natural frequency in the roll direction of the engine unit are approximate, and vibration transmitted to the vehicle body at idling may increase. In addition, the natural frequency in the roll direction of the engine unit is lowered by lowering the dynamic spring constant in the longitudinal direction of the torque rod. However, if the dynamic spring constant in the longitudinal direction of the torque rod is lowered, the engine vibration is reduced. Since the static spring constant necessary for suppressing the movement also decreases, the engine swing may not be sufficiently suppressed.

Therefore, when the torque rod according to the present invention is used as the torque rod as described above, the dynamic spring constant of the torque rod is maintained while maintaining the static spring constant of the torque rod necessary for suppressing the engine swing. The lower the natural frequency of the engine unit in the roll direction, the lower the frequency of the primary rotation component during idling, so that vibration transmitted to the vehicle body during idling is suppressed and engine oscillation is also suppressed. .

The torque rod and the engine unit according to the present invention can improve the vibration transmission characteristics in the idle vibration area without deteriorating the vibration transmission characteristics in the booming sound area.

1 is a plan view schematically showing an engine unit according to an embodiment of the present invention. It is sectional drawing of the torque rod which concerns on embodiment of this invention. It is a side view of the torque rod which concerns on embodiment of this invention. 1 is a side view schematically showing an engine unit according to an embodiment of the present invention. It is a graph which shows the relationship between the frequency of an engine vibration and vibration level for describing embodiment of this invention. It is a fragmentary sectional view of the torque rod for explaining the modification of an embodiment of the invention. It is a fragmentary sectional view of the torque rod for explaining the modification of an embodiment of the invention.

Hereinafter, embodiments of a torque rod and an engine unit according to the present invention will be described with reference to the drawings.
The Y1 direction shown in FIG. 1 is the vehicle front side, the Y2 direction shown in FIG. 1 is the vehicle rear direction, and the X1-X2 direction orthogonal to the vehicle front-rear direction (Y1-Y2 direction) is the vehicle left-right direction. .

An engine unit 1 shown in FIG. 1 is an engine unit that mounts an engine 2 with a pendulum suspension type engine mounting system. The schematic configuration of the engine unit 1 is as follows: the engine 2 and both end portions of the engine 2 (both end portions in the direction of the inertia main axis O). ), And a torque rod 4 disposed on the lower portion of the engine 2. The inertia main axis O described above is a main axis in the roll direction of the engine 2.

The engine 2 is a horizontal two-cylinder engine and is a known engine. The engine 2 is arranged in a direction in which the inertia main shaft O extends along the vehicle left-right direction.

The engine mount 3 is a support member that supports the load of the engine 2, and is interposed between the vehicle body A and the engine 2. The pair of engine mounts 3, 3 are respectively disposed in the vicinity of the inertia main axis O of the engine 2, and respectively support portions in the vicinity of the inertia main axis O of both ends of the engine 2 in the direction of the inertia main axis O. .

As the engine mount 3 described above, for example, an outer cylinder connected to one of the vehicle body A and the engine 2, an inner cylinder connected to the other, and an outer cylinder and the inner cylinder are elastically connected. An anti-vibration device provided with an elastic body can be used. As the engine mount 3, it is also possible to use a liquid seal type vibration isolator in which a liquid chamber is formed in the outer cylinder as described above, and an elastic body is interposed between a pair of plates. It is also possible to use a rubber mount, and it is possible to use a vibration isolator having other configurations.

The torque rod 4 is a damping member that dampens vibrations in the roll direction of the engine 2, and is interposed between the vehicle body A and the engine 2. The torque rod 4 is disposed near the center of the engine 2 in the direction of the inertia main axis O, and extends in the vehicle front-rear direction (Y1-Y2 direction).
The front end (first bush 6) of the torque rod 4 is connected to the engine 2 via an engine bracket 20 suspended from the lower end surface of the center portion of the engine 2 in the inertia main axis O direction. The rear end portion (second bush 7) of the torque rod 4 is connected to the vehicle body A via a vehicle body bracket B provided so as to protrude from the vehicle body A.

This torque rod 4 is provided with a liquid sealing mechanism 8 (shown in FIG. 2) tuned so that liquid column resonance is generated by the input of idle vibration of the engine 2, and the spring is lowered in the torque rod axial direction during idle vibration. This is a liquid-sealed torque rod.
More specifically, as shown in FIGS. 2 and 3, the torque rod 4 is provided at the rod body 5, the first bush 6 provided at one end of the rod body 5, and the other end of the rod body 5. A second bushing 7 and a liquid sealing mechanism 8 provided at an intermediate portion of the rod body 5.

The rod body 5 is a cast metal member, and includes a first rod member 50 and a second rod member 51 joined to one end surface of the first rod member 50 as a schematic configuration.
2 and 3, the chain line L0 connecting the center of the first bush 6 and the center of the second bush 7 is the central axis of the rod body 5, and the direction along the central axis L0 is “Axial direction”. Further, one side in the rod axis direction, that is, the second rod member 51 side (right side in FIG. 2) when viewed from the first rod member 50 is referred to as “front side”, and the other side in the rod axis direction, that is, the second rod member. The first rod member 50 side (left side in FIG. 2) viewed from 51 is referred to as “rear side”. Also, the vertical direction (X1-X2 direction) in FIG. 2 is the left-right direction, and the vertical direction (Z1-Z2 direction) in FIG. 3 is the vertical direction.

A liquid sealing mechanism accommodating portion 52 that accommodates the liquid sealing mechanism 8 is provided at a portion on the front side of the first rod member 50. The liquid sealing mechanism accommodating portion 52 is a cylindrical tubular portion extending along the axial direction, the front end of the liquid sealing mechanism accommodating portion 52 is opened, and the rear end portion of the liquid sealing mechanism accommodating portion 52 is the rear side. The diameter is gradually reduced in a tapered shape toward the side and closed. Further, as shown in FIG. 3, the central axis L <b> 1 of the liquid sealing mechanism accommodating portion 52 is eccentric in the vertical direction with respect to the central axis L <b> 0 of the rod body 5. More specifically, the liquid sealing mechanism accommodating portion 52 is offset upward, and the central axis L1 of the liquid sealing mechanism accommodating portion 52 is located above the central axis L0 of the rod body 5.

In addition, a pair of flanges projecting from the outer peripheral surface of the liquid sealing mechanism housing portion 52 toward the outside in the radial direction (direction orthogonal to the central axis L0) of the liquid sealing mechanism housing portion 52 are formed at the front end of the first rod member 50

Portions

53 and 53 are provided. The pair of

flange portions

53 and 53 are disposed symmetrically with respect to the central axis L0 of the rod body 5. *

A bush mounting hole 55 into which the second bush 7 is fitted is formed at the rear end of the first rod member 50. The bush mounting hole 55 is a through hole extending along a direction (left-right direction) orthogonal to the central axis L0.

The second rod member 51 is a cylindrical member provided with the first bush 6 on the inner side, and extends along a direction (vertical direction) perpendicular to the central axis L0. More specifically, the second rod member 51 is a cylindrical member having a semi-oval shape in plan view, and is disposed perpendicular to the central axis L0 of the torque rod 4 and extends in the left-right direction. A flat wall portion 56 and a substantially U-shaped U wall portion 57 disposed on the front side of the flat wall portion 56 and connected to the flat wall portion 56 at both ends. The flat wall portion 56 is formed with a through hole 54 that communicates the inside of the second rod member 51 and the inside of the first rod member 50.

Further, a pair of

flange portions

58 and 58 projecting from both end portions of the above-described flat wall portion 56 are provided at the rear end portion of the second rod member 51. The pair of

flange portions

58 and 58 are disposed symmetrically with respect to the central axis L0 of the rod body 5 and overlapped with the

flange portions

53 and 53 of the first rod member 50, respectively. And the

flange parts

53 and 53 of the 1st rod member 50 and the

flange parts

58 and 58 of the 2nd rod member 51 are fastened by the volt |

bolts

59 and 59, The 1st rod member 50 and the 2nd rod member 51, Are joined.

The first bush 6 is a rubber bush disposed inside the second rod member 51 and is formed integrally with the second rod member 51. As a schematic configuration of the first bush 6, a first attachment portion 60 attached to the engine 2 via the engine bracket 20 shown in FIG. 1, a first attachment portion 60, and a second rod member 51 of the rod body 5 are provided. A first main body elastic body 61 that is elastically connected.

The first attachment portion 60 is a cast columnar metal member, and is disposed inside the second rod member 51 and extends along a direction (vertical direction) orthogonal to the central axis L0. . An attachment hole 62 for fastening to the engine bracket 20 extends in the first attachment portion 60 along the axial direction of the first attachment portion 60. In addition,

flange portions

67 and 67 projecting toward the left and right sides are provided at the rear end portion of the first mounting portion 60.

The first main body elastic body 61 is a rubber elastic body made of a rubber material interposed between the inner peripheral surface of the second rod member 51 and the outer peripheral surface of the first mounting portion 60. The first main body elastic body 61 is bonded to the inner peripheral surface of the second rod member 51 and the outer peripheral surface of the first mounting portion 60 by vulcanization molding together with the second rod member 51 and the first mounting portion 60 described above. Has been. Further, the first main body elastic body 61 is provided with a pair of

elastic leg portions

64 and 64 disposed symmetrically with respect to the central axis L0. The pair of

elastic leg portions

64 and 64 are extended in a tapered shape so as to expand from the first attachment portion 60 toward the front side.

Further, in the first main body elastic body 61, a portion 63 on the front side of the first mounting portion 60 is formed with a currant 63 penetrating in a direction (vertical direction) perpendicular to the central axis L0.

Buffer rubber portions

65 and 66 are respectively coated on the front end surface of 60 and the inner peripheral surface of the front end portion of the U wall portion 57 of the second rod member 51. In front of the first mounting portion 60, there is disposed a first stopper portion 10 including a front end portion of the U wall portion 57 of the second rod member 51 and a buffer rubber portion 66 bonded to the inner peripheral surface thereof. Since the first mounting portion 60 is locked to the first stopper portion 10, the relative forward displacement of the first mounting portion 60 relative to the rod body 5 is limited.

Moreover, the rubber | gum rubber |

gum parts

68 and 68 are coat | covered by the surface of the rear side of the

flange parts

67 and 67 of the above-mentioned 1st attachment part 60, respectively, These

flange parts

67 and 67 are covered with the 1st bush 6.

Second stopper portions

11, 11 made of

buffer rubber portions

68, 68 are provided.
The second stopper portion 11 is a stopper portion that restricts the relative rearward displacement of the first mounting portion 60 relative to the rod body 5 by being locked to the flat wall portion 56 of the second rod member 51.
The rear surface of the first mounting portion 60 is covered with a buffer rubber portion 69 which is disposed between the

buffer rubber portions

68 and 68 and is thinner than the

buffer rubber portions

68 and 68.

The second bush 7 is a rubber bush that is press-fitted and fitted inside the bush mounting hole 55 of the first rod member 50 described above. As a schematic configuration, the second bush 7 is attached to the vehicle body A via the vehicle body bracket B shown in FIG. A cylindrical second attachment portion 70 to be attached, and a second main body elastic body 71 provided around the outer periphery of the second attachment portion 70 are provided.

The second mounting portion 70 is a cast cylindrical metal member, and is coaxially disposed inside the bush mounting hole 55 and extends along a direction (left-right direction) orthogonal to the central axis L0. .
The second main body elastic body 71 is a cylindrical elastic body interposed between the inner peripheral surface of the bush mounting hole 55 and the outer peripheral surface of the second mounting portion 70, and is a rubber elastic body made of a rubber material. The second main body elastic body 71 is bonded to the outer peripheral surface of the second mounting portion 70 by vulcanization molding together with the second mounting portion 70.

The liquid sealing mechanism 8 is a mechanism in which a liquid chamber 80 filled with a sealing liquid is formed, and is disposed between the first bush 6 and the second bush 7 described above. As a schematic configuration of the liquid sealing mechanism 8, a cylindrical peripheral wall portion 81 in which a liquid chamber 80 is formed, a linkage portion 82 disposed inside a front end portion of the peripheral wall portion 81, a peripheral wall portion 81, A liquid seal elastic body 83 that elastically connects the linkage portion 82 and closes the front end portion of the peripheral wall portion 81, and a liquid chamber 80 on the liquid seal elastic body 83 side (front side) main liquid chamber 80 a and the opposite side thereof. A partition member 84 partitioned into a (rear side) sub liquid chamber 80b and a diaphragm 85 for closing the rear end portion of the peripheral wall portion 81 are provided.

The peripheral wall portion 81 is a cylindrical metal member, and is fitted inside the liquid sealing mechanism accommodating portion 52 and extends along the axial direction. The peripheral wall portion 81 is disposed with the central axis L1 of the liquid sealing mechanism accommodating portion 52 as the central axis, and the central axis L1 of the peripheral wall portion 81 (liquid sealing mechanism 8) is aligned with the central axis L0 of the rod body 5. On the other hand, the liquid sealing mechanism 8 is offset so as to be parallel with a gap.

The link portion 82 is a cast cylindrical metal member, and extends from the inside of the front end portion of the peripheral wall portion 81 toward the front side of the peripheral wall portion 81 along the axial direction. The linkage portion 82 is provided so as to protrude forward from the liquid seal elastic body 83, and the rear end portion (base end portion) of the linkage portion 82 is embedded inside the liquid seal elastic body 83. Further, the front end portion (tip portion) of the linkage portion 82 is penetrated inside the through hole 54 of the second rod member 51, and the front end surface (tip end surface) of the linkage portion 82 is the first attachment portion 60 described above. The rear end face is in contact with the rear end face via a buffer rubber portion 69 so as to be separated.

The liquid seal elastic body 83 is disposed inside the front end portion of the cylindrical peripheral wall portion 81, closes the opening end on the front side of the peripheral wall portion 81, and constitutes part of the wall portion of the main liquid chamber 80a. It is a rubber elastic body made of a rubber material. The liquid seal elastic body 83 is formed in a substantially truncated cone shape that is gradually reduced in diameter toward the front side, and the linkage portion 82 is projected from the front end of the liquid seal elastic body 83. The liquid seal elastic body 83 is bonded to the inner peripheral surface of the peripheral wall portion 81 and the outer peripheral surface of the base end portion of the link portion 82 by vulcanization molding together with the peripheral wall portion 81 and the link portion 82. The liquid seal elastic body 83 includes a covering rubber portion 83 a that covers the inner peripheral surface of the peripheral wall portion 81, and a through hole 54 of the connecting portion 82 and the second rod member 51 that covers the outer peripheral surface of the connecting portion 82. A shock absorbing rubber portion 83b for buffering the inner peripheral surface of the inner peripheral surface is integrally formed.

The partition member 84 is an orifice member in which an orifice passage 87 (restriction passage) that connects the main liquid chamber 80a and the sub liquid chamber 80b is formed, and is press-fitted inside the peripheral wall portion 81. More specifically, the partition member 84 is a circular member disposed perpendicular to the central axis L1, and a circumferential groove serving as an orifice passage 87 is formed on the outer peripheral surface. The open portion on the outer peripheral side of the peripheral groove is closed by a covering rubber portion 83 a covered on the inner peripheral surface of the peripheral wall portion 81 by press-fitting the partition member 84 inside the peripheral wall portion 81. Thereby, an orifice passage 87 extending in the circumferential direction along the inner peripheral surface of the peripheral wall portion 81 is formed. The flow path length and the cross-sectional area (that is, the flow path resistance) of the orifice passage 87 are set (tuned) so that liquid column resonance occurs at the vibration frequency when the engine 2 is idling.

The diaphragm 85 is a deformable film body that constitutes a part of the wall portion of the sub liquid chamber 80 b and is fitted inside the rear end portion of the peripheral wall portion 81. The schematic configuration of the diaphragm 85 includes a substantially cylindrical diaphragm ring 88 and a membrane diaphragm rubber 89 that closes the inside of the diaphragm ring 88. The diaphragm rubber 89 is a bowl-shaped rubber film. By vulcanizing the diaphragm rubber 89 integrally with the diaphragm ring 88, the outer edge portion of the diaphragm rubber 89 is bonded to the inner peripheral surface of the diaphragm ring 88. Yes.

The diaphragm 85 described above is fixed by crimping the rear end portion of the peripheral wall portion 81 together with the diaphragm ring 88 radially inward in a state of being fitted inside the rear end portion of the peripheral wall portion 81. Has been. In addition, the above-described covering rubber portion 83a is interposed between the outer peripheral surface of the diaphragm ring 88 and the inner peripheral surface of the peripheral wall portion 81, whereby the water tightness of the fitting portion between the diaphragm 85 and the peripheral wall portion 81 is interposed. Is secured.

By the way, in the state where the first rod member 50 and the second rod member 51 are joined by the

bolts

59, 59, the front end surface of the linkage portion 82 is the rear end surface (the buffer rubber portion 69) of the first attachment portion 60. At least one of the first main body elastic body 61 and the liquid seal elastic body 83 is pre-compressed. The magnitude of this precompression force is, for example, the amount of force when moving at the maximum displacement amount of the first mounting portion 60, the amount of creep torque of the engine 2, the amount of force when moving in the opposite phase of the fluid, The total value of

Next, the operation of the torque rod 4 having the above configuration will be described.

When the engine 2 shown in FIG. 1 is idling, the idle vibration is transmitted to the first mounting portion 60 shown in FIG. 2 via the engine bracket 20, and the first main body elastic body 61 shown in FIG. 2 is elastically deformed. As a result, the first main body elastic body 61 acts as a vibration absorption main body, and the idle vibration is absorbed by the vibration absorbing action based on the internal friction of the first main body elastic body 61, and the vehicle body A from the engine 2 via the torque rod 4 is absorbed. The idle vibration transmitted to is reduced.

At this time, since the tip of the linkage portion 82 is in contact with the first attachment portion 60, when idle vibration is input to the first attachment portion 60, the vibration is transmitted to the linkage portion 82 and the liquid seal elastic body 83. Is elastically deformed. As a result, the sealed liquid in the liquid chamber 80 passes between the main liquid chamber 80a and the sub liquid chamber 80b through the orifice passage 87. At this time, the orifice passage 87 is tuned such that the flow path length and cross-sectional area cause liquid column resonance in the frequency band of idle vibration, so that the resonance phenomenon (liquid column resonance) occurs in the sealed liquid flowing through the orifice passage 87. ) Occurs. As a result, the torque rod 4 is lowered in spring, the idle vibration input to the torque rod 4 is attenuated, and the idle vibration transmitted to the vehicle body A side is reduced.

Further, when the vehicle is accelerated by driving the engine 2 shown in FIG. 1, the engine 2 rotates around the inertia main axis O as shown in FIG. 4, and the first bush 6 is moved with respect to the second bush 7. To displace in a relatively separated direction. Thereby, the front-end | tip part of the connection part 82 spaces apart from the rear-end surface (buffer rubber | gum part 69) of the 1st attachment part 60, and the liquid sealing mechanism 8 is isolate | separated from the 1st bush 6. FIG. As a result, lowering of the spring due to the liquid column resonance described above is avoided, and vibration is absorbed based on the characteristics of the first main body elastic body 61, so that the vibration transmission characteristics in the booming sound region do not deteriorate.

According to the torque rod 4 described above, it is possible to improve the vibration transmission characteristics in the idle vibration area without deteriorating the vibration transmission characteristics in the booming sound area during vehicle acceleration.

Further, in the torque rod 4 described above, since the liquid sealing mechanism 8 is disposed in the portion of the rod body 5 between the first bush 6 and the second bush 7, the position of the center of gravity of the torque rod 4 is the rod. Near the center of the main body 5 in the longitudinal direction. Thereby, pitching of the torque rod 4 can be suppressed, and deterioration of vibration transmission characteristics due to pitching can be prevented.

Further, in the torque rod 4 described above, the pair of

elastic legs

64, 64 of the first main body elastic body 61 are extended in the direction extending from the first mounting portion 60 toward the front side, and the linkage portion 82 is the first. Since it is in contact with the rear end surface of the attachment portion 60, the first attachment portion 60 is pressed from three directions by the pair of

elastic leg portions

64 and 64 and the linkage portion 82 when an idle vibration is input. Thereby, the vertical and horizontal movements of the first mounting portion 60 can be stabilized.

Further, in the torque rod 4 described above, the first rod member 50 and the second rod member 51 are fastened by

bolts

59 and 59, whereby the distal end portion of the linkage portion 82 is pressed into contact with the first mounting portion 60. Since at least one of the main body elastic body 61 and the liquid seal elastic body 83 is pre-compressed, the distal end portion of the linking portion 82 is surely in contact with the first mounting portion 60 during idle vibration. In addition, the precompression force can be easily applied, and the precompression force can be easily adjusted. Thereby, the vibration transmission characteristic in an idle vibration area | region can be improved reliably.

Further, in the torque rod 4 described above, the liquid sealing mechanism 8 is offset so that the central axis L1 of the liquid sealing mechanism 8 is parallel to the central axis L0 of the rod body 5 with an interval therebetween. 8 is separated from the interference line with the vehicle body A, and interference between the torque rod 4 and the vehicle body A is prevented. Thereby, the engine unit 1 can be mounted in a narrow space.

Further, according to the engine unit 1 described above, since the static spring constant of the torque rod 4 necessary for suppressing the swing of the engine 2 is maintained, the dynamic spring constant of the torque rod 4 becomes low. As shown in FIG. 5, the natural frequency in the roll direction of the engine unit 1 is lowered to about 7 to 8 Hz and is separated from the frequency (about 10 Hz) of the primary rotational component during idling. Thereby, vibration transmitted to the vehicle body A during idling can be suppressed, and swing of the engine 2 can be suppressed. As a result, in the engine unit 1 in which the two-cylinder engine 2 is mounted by the pendulum suspension system engine mounting system, the idling vibration transmitted to the vehicle body A can be reduced while maintaining the swing suppression performance of the engine 2. .

The embodiments of the torque rod and the engine unit according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.
For example, as shown in FIG. 6A, a configuration may be adopted in which a recess 169 is provided on the rear end surface of the first attachment portion 60, and the leading end of the linkage portion 182 is inserted inside the recess 169. The recess 169 is made of a rubber body that is vulcanized and bonded to the first mounting portion 60, and is formed integrally with the first main body elastic body 61. Further, the front end surface of the linkage portion 182 is a convex curved surface that is rounded into a substantially hemispherical shape. The bottom surface of the concave portion 169 is a concave curved surface corresponding to the shape of the front end surface of the linkage portion 182, and the front end surface of the connecting portion 182 is in contact with the bottom surface of the concave portion 169 so as to be separated.
According to the torque rod 4 having the concave portion 169 and the linkage portion 182, the linkage portion 182 can be prevented from being displaced in the axial direction, and the linkage portion 182 can be prevented from coming off at the time of large displacement. In addition, the axial movement of the linkage portion 182 can be guided by the recess 169. The leading end surface of the linkage portion 182 is formed in a convex curved surface shape, and the bottom surface of the concave portion 169 is formed in a concave curved surface shape, so that the linkage portion 182 is aligned by inserting the linkage portion 182 into the concave portion 169. In addition, when the linkage portion 182 is inserted into the recess 169, it is easily guided by the distal end surface of the linkage portion 182, and further, the rubber recess 169 can be prevented from being broken.

Further, as shown in FIG. 6B, a configuration in which the linkage portion 282 protrudes from the first bush 6 and the tip end portion of the linkage portion 282 is in contact with the liquid seal elastic body 283 so as to be separable may be used. More specifically, the first mounting portion 60 is provided with a linking portion 282 that extends in the axial direction toward the rear side, and the linking portion 282 and the first mounting portion 60 are integrally formed. Has been. At the rear end of the linkage portion 282, a substantially truncated cone-shaped enlarged diameter portion 282a is formed. A concave portion 283a having a substantially truncated cone shape is formed on the front end surface of the liquid seal elastic body 283, and the enlarged diameter portion 282a at the rear end of the linkage portion 282 is inserted inside the concave portion 283a, and is formed on the bottom surface of the concave portion 283a. The rear end surface of the enlarged diameter portion 282a is in contact with the separable portion. Thus, by forming the linkage part 282 integrally with the first attachment part 60, the number of parts can be reduced, and the cost can be reduced.

In the above-described embodiment, the engine unit 1 having only one torque rod 4 is described. However, the present invention may be an engine unit having a plurality of torque rods.

In the above-described embodiment, the liquid sealing mechanism 8 is disposed at the intermediate portion of the rod body 5, but the position of the liquid sealing mechanism can be changed in the present invention. For example, even if the liquid sealing mechanism is disposed on the front side of the rod body 5 and the liquid sealing mechanism, the first bush 6 and the second bush 7 are disposed in this order from the front side to the rear side. Good.

In the above-described embodiment, the first main body elastic body 61 including the pair of

elastic legs

64 and 64 is provided. However, the shape of the main body elastic body in the present invention can be changed. The structure by which the elastic leg part protruded from the attachment part 60 toward right and left both sides may be sufficient.

Moreover, in above-described embodiment, the rod main body 5 consists of the 1st rod member 50 and the 2nd rod member 51, and these 1st rod members 50 and the 2nd rod member 51 are joined, A 1st main body A pre-compression force is applied to at least one of the elastic body 61 and the liquid seal elastic body 83, but it may be a rod body made of one component. In this case, for example, a pre-compression force can be applied to the main body elastic body or the liquid seal elastic body by press-fitting the first bush into a bush mounting hole formed at one end of the rod main body. It is also possible to adopt a configuration in which a precompression force is not applied to the main body elastic body or the liquid seal elastic body.

In the above-described embodiment, the liquid sealing mechanism 8 is offset so that the central axis L1 of the liquid sealing mechanism 8 is parallel to the central axis L0 of the rod body 5 with an interval therebetween. The liquid sealing mechanism 8 may not be offset, and the liquid sealing mechanism 8 may be disposed coaxially with the rod body 5.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

1 Engine Unit 2 Engine 3 Engine Mount 4 Torque Rod 5 Rod Body 6 First Bush 7 Second Bush 8 Liquid Sealing Mechanism 50 First Rod Member 51 Second Rod Member 60 First Mounting Portion (Mounting Portion)
61 1st body elastic body (main body elastic body)
64 A pair of elastic legs 80 Liquid chamber 80a Main liquid chamber 80b Sub liquid chamber 82 Linking portion 83 Liquid seal elastic body 87 Orifice passage (restriction passage)
A body

Claims

A first provided with an attachment part attached to one of a vibration generating part and a vibration receiving part and a main body elastic body elastically connecting the attachment part and the rod body to one end of the rod body A bush is provided,
In the torque rod provided at the other end of the rod body with a second bush attached to either the vibration generating part or the vibration receiving part,
A liquid sealing mechanism having a liquid chamber in which a sealing liquid is sealed, and a liquid sealing elastic body constituting a part of a wall portion of the liquid chamber;
The liquid chamber is partitioned into a main liquid chamber and a sub liquid chamber on the liquid seal elastic body side, and a restriction passage that connects the main liquid chamber and the sub liquid chamber is formed in the liquid seal mechanism,
One of the liquid seal elastic body and the first bush is provided with a linking portion protruding, and the tip of the linking portion is separated from either the liquid seal elastic body or the first bush. Torque rod that is abutted against.
The torque rod according to claim 1, wherein the liquid sealing mechanism is disposed in a portion of the rod body between the first bush and the second bush.
The main body elastic body includes a pair of elastic legs disposed symmetrically with respect to an axial extension line of the linkage portion, and the pair of elastic legs is opposite to the linkage portion from the mounting portion. The torque rod according to claim 1, wherein the torque rod extends in a direction extending toward the front.
The rod main body is provided with a first rod member provided with the liquid sealing mechanism and a second rod member provided with the first bush.
By joining the first rod member and the second rod member, the distal end portion of the linkage portion is brought into pressure contact with one of the liquid seal elastic body and the first bush, and the main body elastic body and The torque rod according to any one of claims 1 to 3, wherein at least one of the liquid seal elastic bodies is pre-compressed.
The torque rod according to any one of claims 1 to 4, wherein the liquid sealing mechanism is offset so that a central axis of the liquid sealing mechanism is parallel to the central axis of the rod body with a space therebetween.
An engine, a pair of engine mounts arranged on both sides of the engine in the principal axis direction of the engine to support the load of the engine, and interposed between the engine and the vehicle body to suppress vibration in the roll direction of the engine. An engine unit comprising: a torque rod for shaking;
As the engine, a two-cylinder engine is provided,
An engine unit provided with the torque rod according to any one of claims 1 to 5 as the torque rod.