JP2012140994A - Stopper structure of engine mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage of side stoppers arranged between an outer tube of an engine mount and an engine mount bracket.SOLUTION: An inner tube of the engine mount supporting an engine is installed at the engine via the engine mount bracket 11 of a U shape in cross section. The outer tube 8 of the engine mount is installed at a vehicle body via a vehicle body side installation bracket 12. A stopper structure of the engine mount 11 has side stoppers 30, 31 formed of elastic bodies in a gap between the outer tube 8 of the engine mount and the engine mount bracket 11. In the stopper structure, mass dampers are installed at the circumferential surface of the outer tube of the engine mount. The mass dampers 32, 33 are arranged at axial opposite sides of the outer tube of the engine mount to project in the axial direction of the outer tube beyond axial end faces and have such a thickness that the axial end faces of the outer tube 9 do not contact with the side stoppers 30, 31.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount stopper structure, and more particularly to an engine mount stopper structure that prevents damage to a side stopper for restricting engine swing in an engine mount that supports an engine.

In the structure in which the engine of the front engine / front drive type vehicle is supported by the engine mounts on the right side, the left side, and the rear side, the rear side of the engine 101 is supported as shown in FIGS. The rear engine mount 102 is often provided on the suspension frame 103. The rear engine mount 102 includes an inner cylinder 104 and an outer cylinder 105, and an elastic body 106 interposed between the inner cylinder 104 and the outer cylinder 105. The inner cylinder 104 is attached to the engine 101 via an engine mount bracket 107 having a U-shaped cross section. The outer cylinder 105 is attached to the suspension frame 103 of the vehicle body via the vehicle body side mounting brackets 108 and 109.
In such a case, if an attempt is made to satisfy an ideal functional position with respect to the rear engine mount 102, the front wheel suspension stabilizer 110, and the front wheel steering housing 111, the rear engine mount is placed above the stabilizer 110 and the steering housing 111. 102 is generally arranged.

However, when the rear engine mount 102 is disposed above the stabilizer 110 and the steering housing 111, each of the vehicle body side mounting brackets 108 and 109 for mounting the rear engine mount 102 to the suspension frame 103 is obtained from such a positional relationship. The leg lengths L1 and L2 of the leg portions 112 and 113 become long.
For this reason, the rigidity of the vehicle body side mounting brackets 108 and 109 with respect to the vibration of the engine 101 decreases, and the rear engine mount 102 itself generates vibrations on the left and right sides of the vehicle (arrow A in FIG. 7). 9, as shown in FIG. 9, vibrations of the floor 114 and the dash panel 115 and a booming sound in the passenger compartment 116 are induced. At present, as one of the countermeasures, the natural frequency is changed by attaching the mass damper 118 to the circumferential surface 117 of the outer cylinder 105 of the rear engine mount 102 to reduce the vibration level.

In addition, in the structure of the engine mount that supports the engine at three points on the right side, the left side, and the rear side, in order to improve the NVH performance of the vehicle, the elastic body of the right engine mount, the elastic body of the left engine mount, the rear side It is necessary to set each characteristic of the elastic body 106 of the engine mount 102 softly (lower the spring constant). On the other hand, by softening the characteristics of the elastic body 106, the operation of the engine 101 is increased particularly in an operating situation in which the engine 101 swings greatly, and the axial end surfaces 119 and 120 of the outer cylinder 105 and the engine The pair of mounting portions 121 and 122 of the mount bracket 107 interfere with each other and affect steering stability (see FIG. 10).
Therefore, in general, an elastic body stopper is provided on the engine mount so as to satisfy both requirements, and a structure for forcibly restricting the movement is generally adopted. For example, as shown in FIG. 11, the gap between the axial end surfaces 119 and 120 of the outer cylinder 105 and the pair of mounting portions 121 and 122 of the engine mount bracket 107 is formed at both axial ends of the outer cylinder 105 of the rear engine mount 102. In order to prevent interference between metals, a stopper structure having thin plate-like side stoppers 123 and 124 made of an elastic body is employed. (Patent Document 1)

Japanese Patent No. 2659678

By the way, as shown in FIG. 11, the stopper structure of the engine mount is formed from an elastic body as a cushioning material in the gap between the axial end surfaces 119 and 120 of the outer cylinder 105 and the pair of mounting portions 121 and 122 of the engine mount bracket 107. In general, the outer cylinder 105 is generally formed by rounding a sheet metal into a cylindrical shape.
Therefore, when the engine 101 swings and the outer cylinder 105 contacts the side stoppers 123 and 124, as shown in FIG. 124, and is a hit in a state close to a line rather than a surface.
At this time, in a vehicle having a large swing amount due to the elastic body characteristics (spring hardness) of the engine mount, the engine weight balance, the support balance, etc., the axial end surfaces 119 and 120 of the outer cylinder 105 and the mounting portion 121 of the engine mount bracket 107 are mounted. The outer cylinder 105 may scrape the side stoppers 123 and 124 more than necessary due to strong interference with 122 and many interferences.
Depending on the situation, the outer cylinder 105 breaks through the side stoppers 123 and 124, losing the buffer function, and interference between the outer cylinder 105 and the engine mount bracket 107 made of sheet metal on the other side occurs, resulting in abnormal noise and paint peeling. Problems such as corrosion occur.

  An object of the present invention is to prevent damage to a side stopper disposed between an outer cylinder of an engine mount and an engine mount bracket.

  In the present invention, an engine mount that supports an engine has an inner cylinder and an outer cylinder, and an elastic body interposed between the inner cylinder and the outer cylinder, and the inner cylinder is provided with an engine mount bracket having a U-shaped cross section. The outer cylinder is attached to the vehicle body via a body-side mounting bracket, and metal interference occurs in the gap between the outer cylinder and the engine mount bracket at both ends of the engine mount in the axial direction of the outer cylinder. In order to prevent, in the stopper structure of the engine mount having a side stopper made of an elastic body, a mass damper for reducing a vibration level specific to the engine mount is attached to a circumferential surface of the outer cylinder of the engine mount, and the mass damper is On both sides in the axial direction of the outer cylinder of the engine mount, the axial direction of the outer cylinder protrudes from the axial end face, Wherein the axial end surface of the outer tube are disposed with a thickness which does not contact with the side stoppers.

In the engine mount stopper structure according to the present invention, the mass damper attached to the circumferential surface of the outer cylinder of the engine mount is arranged so as to protrude from the axial end surface of the outer cylinder so that the wide surface of the mass damper is in surface contact with the side stopper. Will do.
As a result, the stopper structure of the engine mount of the present invention can use the mass damper as a stopper, and the metal edge of the axial end surface of the outer cylinder does not come into line contact with the side stopper, thereby preventing damage to the side stopper. The durability of the side stopper is improved, and parts damage and abnormal noise due to metal contact can be prevented continuously.

FIG. 1 is a plan view of a stopper structure of a rear engine mount. (Example) FIG. 2 is an enlarged plan view of the mass damper portion. (Example) FIG. 3 is a perspective view of the rear engine mount. (Example) FIG. 4 is a side view of the rear engine mount with the engine supported. (Example) FIG. 5 is a perspective view of the engine indicated by the engine mount. (Example) FIG. 6 is a plan view of the stopper structure of the rear engine mount. (Modification) FIG. 7 is a perspective view of the rear engine mount with the engine supported. (Conventional example) FIG. 8 is a side view of the rear engine mount with the engine supported. (Conventional example) FIG. 9 is a side view of the rear engine mount showing a state of vibration propagation to the vehicle body. (Conventional example) FIG. 10 is a cross-sectional perspective view of the rear engine mount. (Conventional example) FIG. 11 is a plan view of the stopper structure of the rear engine mount. (Conventional example) FIG. 12 is a cross-sectional view of the rear engine mount showing the interference between the outer cylinder and the engine mount bracket. (Conventional example)

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

1 to 5 show an embodiment of the present invention. In FIG. 5, 1 is an engine, 2 is a suspension frame, 3 is a front wheel suspension stabilizer, and 4 is a front wheel steering housing. The engine 1 is supported by a right engine mount 5, a left engine mount 6, and a rear engine mount 7 at three points on the right side, the left side, and the rear side. A rear engine mount 7 that supports the rear side of the engine 1 is disposed above the stabilizer 3 and the steering housing 4 disposed on the suspension frame 2.
As shown in FIGS. 3 and 4, the rear engine mount 7 includes an inner cylinder 8 and an outer cylinder 9 and an elastic body 10 interposed between the inner cylinder 8 and the outer cylinder 9. The inner cylinder 8 is attached to the engine 1 via an engine mount bracket 11 having a U-shaped cross section. The outer cylinder 9 is attached to the suspension frame 2 of the vehicle body via the vehicle body side mounting brackets 12 and 13.
As shown in FIG. 1, the engine mount bracket 11 has a pair of attachment portions 14 and 15 and a connection portion 16 that connects the attachment portions 14 and 15, and is formed in a U shape in plan view. The engine mount bracket 11 has a pair of attachment portions 14 and 15 attached to the inner cylinder 8 with fastening bolts 17 and a connection portion 16 attached to the engine 1 with fastening bolts 18.
The vehicle body side mounting brackets 12 and 13 have bowl-shaped leg portions 19 and 20, respectively, have fixing portions 21 and 22 on one side of the leg portions 19 and 20, and mounting portions 23 and 24 on the other side. Have. As shown in FIG. 4, the vehicle body side mounting brackets 12 and 13 fix the fixing portions 21 and 22 to the circumferential surface 25 of the outer cylinder 8 by welding or the like, and attach the mounting portions 23 and 24 to the suspension frame 2 with fastening bolts 26. -It is attached by 27.

As shown in FIG. 1, the rear engine mount 7 has gaps between axial end surfaces 28 and 29 of the outer cylinder 9 and a pair of mounting portions 14 and 15 of the engine mount bracket 11 at both axial ends of the outer cylinder 9. In order to prevent interference between metals, thin plate-like side stoppers 30 and 31 made of an elastic body are arranged.
A pair of metal mass dampers 32 and 33 are attached to the circumferential surface 25 of the outer cylinder 9 of the rear engine mount 7 to reduce the vibration level inherent to the engine mount. As shown in FIG. 2, the mass dampers 32 and 33 are formed in a square bar shape that is curved in an arc shape, and on both sides in the axial direction of the outer cylinder 9, the axial direction of the outer cylinder 9 is more than the axial end faces 28 and 29. The side surfaces 34 and 35 are projected by a projecting length L3, and the axial end surfaces 28 and 29 of the outer cylinder 9 are disposed so as not to contact the side stoppers 30 and 31.

Conventionally, in the stopper structure, as shown in FIG. 12, the metal edges of the axial end surfaces 119 and 120 of the outer cylinder 105 of the rear engine mount 102 are in line contact with the side stoppers 123 and 124 when the engine 101 swings. As a result, the side stoppers 123 and 124 are cut, causing damage.
The stopper structure of the rear engine mount 7 is such that the side surfaces 34 and 35 of the mass dampers 32 and 33 attached to the circumferential surface 25 of the outer cylinder 9 of the rear engine mount 7 are connected to the axial end faces 28 and 29 of the outer cylinder 9. By arranging the projections so as to protrude further, the wide side surfaces 34 and 35 of the mass dampers 32 and 33 come into surface contact with the side stoppers 30 and 31.
Accordingly, the stopper structure of the rear engine mount 7 can use the mass dampers 32 and 33 as stoppers, and the metal edges of the axial end surfaces 28 and 29 of the outer cylinder 9 are in line contact with the side stoppers 30 and 31. Therefore, the side stoppers 30 and 31 can be prevented from being damaged, the durability of the side stoppers 30 and 31 can be improved, and damage to parts and abnormal noise due to metal contact can be prevented continuously.

Further, as shown in FIG. 4, the mass dampers 32, 33 of the rear engine mount 7 are attached to the mounting portions 14, 15 of the engine mount bracket 11 and the axial end face 28 of the outer cylinder 9 when viewed from the axial direction of the outer cylinder 9. -It is arrange | positioned in the area S which 29 overlaps.
This stopper structure of the rear engine mount 7 has a possibility that the mass dampers 32 and 33 are in a section S where the mounting portions 14 and 15 of the engine mount bracket 11 and the axial end surfaces 28 and 29 of the outer cylinder 9 overlap, that is, both may come into contact with each other. By arrange | positioning in the certain area S, the contact with the outer cylinder 9 and the side stoppers 30 and 31 can be prevented reliably.
In the above-described embodiment, the pair of mass dampers 32 and 33 are attached to the outer cylinder 9. However, due to cost reduction and required mass weight, the left and right mass dampers 32 and 33 are replaced by an intermediate mass damper 36 as shown in FIG. The side surfaces 34 and 35 are protruded from the axial end surfaces 28 and 29 in the axial direction of the outer cylinder 9 on both sides in the axial direction of the outer cylinder 9, and the axial end surfaces 28 and 29 of the outer cylinder 9 are The same effect can be achieved by arranging the side stoppers 30 and 31 so as not to contact each other.
Further, in the above-described embodiment, the mass dampers 32 and 33 are made of metal, but by using an elastic body, the contact with the side stoppers 30 and 31 can be softened to prevent damage, and the durability of the side stoppers 30 and 31 can be prevented. This can improve the performance and prevent damage to parts and abnormal noise.

  The present invention prevents damage to a side stopper disposed between an outer cylinder of an engine mount and an engine mount bracket, and can be applied not only to an engine but also to a mount that supports a vibrating heavy object. .

DESCRIPTION OF SYMBOLS 1 Engine 2 Suspension frame 7 Rear side engine mount 8 Inner cylinder 9 Outer cylinder 10 Elastic body 11 Engine mount bracket 12 Car body side mounting bracket 13 Car body side mounting bracket 14 Mounting part 15 Mounting part
16 connecting portion 25 circumferential surface 28 axial end surface 29 axial end surface 30 side stopper 31 side stopper 32 mass damper 33 mass damper 34 side surface 35 side surface

Claims (2)

The engine mount that supports the engine has an inner cylinder and an outer cylinder, and an elastic body interposed between the inner cylinder and the outer cylinder,
The inner cylinder is attached to the engine via an engine mount bracket having a U-shaped cross section,
The outer cylinder is attached to the vehicle body via a vehicle body side mounting bracket,
In the engine mount stopper structure having side stoppers made of an elastic body in order to prevent interference between metals in the gap between the outer cylinder and the engine mount bracket at both ends of the engine mount in the axial direction of the outer cylinder,
A mass damper for reducing the vibration level inherent to the engine mount is attached to the circumferential surface of the outer cylinder of the engine mount,
The mass damper protrudes from the axial end face in the axial direction of the outer cylinder on both axial sides of the outer cylinder of the engine mount, and has a thickness such that the axial end face of the outer cylinder does not contact the side stopper. Engine mount stopper structure characterized by being arranged.   2. The engine mount stopper according to claim 1, wherein the mass damper is disposed in a section where the engine mount bracket and an axial end surface of the outer cylinder overlap with each other when viewed from the axial direction of the outer cylinder. Construction.

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