JP7095202B2 - Support structure of vehicle power unit - Google Patents

Description

The present invention relates to a support structure for a vehicle power unit .

For elastically supporting a vehicle engine, for example, the rubber bush member described in Patent Document 1 is used. This rubber bush member basically has an outer cylinder, an inner cylinder, and a rubber elastic body interposed between them.

In this type of rubber bush member, the outer cylinder is press-fitted into the cylinder portion provided on either the support base of the vehicle body or the like or the support target of the engine or the like, and the shaft member such as the bolt inserted into the inner cylinder is the support base. It is used by being fixed to one of the supporting objects. As a result, the vibration of the supported object is absorbed or alleviated by the elastic deformation of the rubber.

The rubber of the rubber bush member described in Patent Document 1 is molded so that a part thereof covers the edge of the outer cylinder. The following problems have been pointed out for the rubber bush member having such a structure.

First, when the outer cylinder is press-fitted into the cylinder portion, the rubber covering the edge of the outer cylinder hinders the press-fitting operation, or the rubber is locally forcibly deformed during press-fitting, and the performance of the rubber bush member is constant due to the influence. It may not be possible.

Second, in the assembled state where the outer cylinder moves relative to the support base to which the inner cylinder is fixed, a sufficient gap is provided between the outer cylinder and the support base in order to avoid interference between the outer cylinder and the support base during operation. If it is to be provided, it is necessary to shorten the axial dimension of the outer cylinder by the thickness of the rubber covering the end of the outer cylinder, and as a result, the volume of the rubber becomes smaller and the degree of freedom of the elastic property as the rubber bush member is reduced. Is impaired.

Japanese Unexamined Patent Publication No. 2000-320592

The present invention has been conceived under the above circumstances, and the rubber is not locally deformed when the outer cylinder is press-fitted into the cylinder portion of the rubber bush member, and the rubber is not deformed locally, and the outer cylinder is axially oriented. An object of the present invention is to provide a support structure for a power unit for a vehicle, which can eliminate a problem at the time of interference with a support base without shortening the dimensions.

In order to solve the above problems, the following technical means are adopted in the present invention.

That is, the support structure of the vehicle power unit provided by the present invention is a support structure of the vehicle power unit that supports the vehicle power unit on the vehicle body side support base via the rubber bush member, and the rubber bush member is outside. It has a cylinder, an inner cylinder, and a rubber elastic body interposed between them, and the rubber elastic body is opposed to at least a part of the inner circumference at the end of the outer cylinder. A projecting piece portion is formed that protrudes outward in the axial direction of the outer cylinder by a predetermined length from the end portion of the outer cylinder and can be tilted and deformed in the radial direction of the outer cylinder . When the projecting piece portion falls and deforms in the radial direction of the outer cylinder, the end portion of the outer cylinder is set to be covered, and the support base hits the projecting piece portion. It is characterized in that an inclined surface is provided on the end side of the outer cylinder to guide the protruding piece portion when it comes into contact with the outer cylinder and deform it.

Since the protruding piece portion protrudes in the axial direction of the outer cylinder and does not cover the end portion of the outer cylinder, a part of the rubber elastic body is formed on the outer cylinder and the cylinder portion when the outer cylinder is press-fitted into the cylinder portion. There is no such thing as biting in between. As a result, the performance of the rubber bush member does not vary due to forcible deformation of a part of the rubber elastic body at the time of press fitting.

When the outer cylinder tries to interfere with the support base, the projecting piece covers the end of the outer cylinder and falls and deforms so as to be sandwiched between the outer cylinder and the support base. It is possible to alleviate the impact of the noise and suppress the generation of abnormal noise. In addition, since it is possible to eliminate problems when the outer cylinder interferes with the support base without shortening the axial dimension of the outer cylinder, the required volume of the rubber elastic body can be secured and the elasticity as a rubber bush member can be secured. The degree of freedom of characteristics can be maintained.

Other features and advantages of the invention will become more apparent from the detailed description given below with reference to the drawings.

It is a schematic block diagram of the support structure of the power unit for a vehicle to which this invention is applied , and is the figure seen from the left side surface of a vehicle. It is a vertical sectional view of the main part of the support structure of the power unit for a vehicle which concerns on one Embodiment of this invention. It is a top view of the rubber bush member used for the support structure of FIG. It is a vertical sectional view of the rubber bush member used for the support structure of FIG. It is an operation explanatory view of the rubber bush member used for the support structure of FIG. It is an operation explanatory view of the rubber bush member used for the support structure of FIG.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. In the figure, the front direction of the vehicle is indicated by fr, and the rear direction of the vehicle is indicated by rr.

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As shown in FIG. 1, the vehicle power unit P has a transverse gasoline engine and a transmission connected to each other, and the left and right portions on the horizontal axis A passing through the substantially center of gravity have left and right engine mounts (not shown). It is elastically supported by the vehicle body (both sides of the engine room) via the vehicle body (both sides of the engine room), while its lower portion is elastically supported by the vehicle body, specifically, the suspension member (support base) 2 via a member called a torque rod 1 extending rearward. Has been done. As shown in FIG. 2, the rear end of the torque rod 1 is elastically supported by the suspension member 2 via the rubber bush member 3 to which the present invention is applied.

As shown in FIG. 2, the suspension member 2 is a sheet metal member having a closed cross-sectional structure formed by an upper surface portion 21, a lower surface portion 22, a front surface portion 23, and a rear surface portion 24 and extending in the vehicle width direction. The torque rod 1 extends into the suspension member 2 from an opening 231 provided in the front surface portion 23, and a tubular portion 11 having a substantially vertical axis is provided at the rear end portion.

As shown in FIGS. 2 to 4, the rubber bush member 3 has an outer cylinder 31, an inner cylinder 32, and a rubber elastic body 4 interposed between them. The outer cylinder 31 is fixed to the cylinder portion 11 at the rear end of the torque rod 1 by press fitting, and the upper and lower ends of the inner cylinder 32 are sandwiched between the upper surface portion 21 and the lower surface portion 22 of the suspension member 2. Then, the nut 26 is fastened to the suspension member 2 by fastening the nut 26 to the end of the bolt 25 that is communicated with the inner cylinder 32 or the bolt through holes 211 and 222 provided in the upper surface portion 21 and the lower surface portion 22, respectively. Has been done.

As shown in FIG. 2, a positioning convex portion 223 for smoothly fixing the inner cylinder 32 to the suspension member 2 by bolts 25 and nuts 26 is formed on the inner surface of the lower surface portion 22 of the suspension member 2. ing. That is, when the torque rod 1 in which the outer cylinder 31 of the rubber bush member 3 is press-fitted into the cylinder portion 11 is inserted rearward from the opening 231 of the suspension member 2, the inner cylinder 32 is locked to the positioning convex portion 223. This prevents the inner cylinder 32 from moving further backward. At this time, even if the positions of the bolt through holes 211 and 222 of the upper surface portion 21 and the lower surface portion 22 and the center hole 321 of the inner cylinder 32 are matched to some extent and the position of the inner cylinder 32 is difficult to see from the outside, each bolt through The work of communicating and inserting the bolt 25 into the holes 211 and 222 and the center hole 321 of the inner cylinder 32 becomes easy.

As described above, the rubber elastic body 4 is interposed between the outer cylinder 31 and the inner cylinder 32 of the rubber bush member 3, but as shown in FIGS. 2 and 4, the rubber elastic body 4 is the inner cylinder. The axial range of the inner cylinder 32 that contacts the outer peripheral surface of the 32 is the range between both ends of the inner cylinder 32 in the axial direction, and the rubber elastic body 4 contacts the inner peripheral surface of the outer cylinder 31. The axial range of the outer cylinder 31 is the range between both ends of the outer cylinder 31 in the axial direction. That is, the rubber elastic body 4 does not cover both ends 311 of the outer cylinder 31.

As shown in FIGS. 2 to 4, the rubber elastic body 4 is formed with a currant portion 41 for obtaining desired characteristics related to vibration isolation. In the present embodiment, the currant portion 41 is set so as to be able to better absorb the relative vibration in the vehicle front-rear direction between the outer cylinder 31 and the inner cylinder 32 in the assembled state of the rubber bush member 3.

As shown in FIGS. 2, 4, and 5, the rubber elastic body 4 faces the rubber elastic body 4 from the end 311 of the outer cylinder 31 with a slight gap s on the inner circumference of the end 311 of the outer cylinder 31. A projecting piece portion 42 projecting outward in the axial direction of the outer cylinder 31 having a predetermined length is integrally formed. In the present embodiment, the projecting piece portion 42 is formed in a central angle α range of about 50 ° so as to face the inner surface of the outer cylinder 31 (FIG. 3), and the circumference of the outer cylinder 31 of the projecting piece portion 42 is formed. The forming position in the direction is the rear side in the front-rear direction of the vehicle in the assembled state of the rubber bush member 3.

The protruding piece portion 42 has a plate shape having a substantially rectangular cross section, and the protrusion amount covers the end portion 311 of the outer cylinder 31 when it is tilted outward and deformed as shown in FIG. 6 due to an external force. It is set to be able to.

In the present embodiment, as is clearly shown in FIGS. 3, 4, and 5, the projecting piece portion 42 is integrally formed with a plurality of thin rod-shaped protrusions 421 that further extend from the tip thereof. Has been done. Such protrusions 421 can be formed by forming pores in the molding die of the rubber elastic body 4 for venting.

Also in the present embodiment, the projecting piece portions 42 are similarly formed on both sides of the rubber elastic body 4 in the axial direction. This is so that even if the rubber bush member 3 is press-fitted into the tubular portion 11 regardless of the front and back sides, the protruding piece portion 42 can perform the desired action.

Next, the operation of the support structure of the vehicle power unit according to the above configuration will be described.

When the vehicle power unit P operates, vibration occurs in the power unit P around the horizontal axis A (the axis connecting the left and right engine mounts) that generally passes through the center of gravity. This vibration becomes vibration in the axial direction (vehicle front-rear direction) of the torque rod 1 and is transmitted to the rubber bush member 3. In the rubber bush member 3, the outer cylinder 31 vibrates in the vehicle front-rear direction, and this vibration is absorbed or damped by the deformation of the rubber elastic body 4, whereby the torque rod 1 vibrates in the vehicle front-rear direction. Is not transmitted to the inner cylinder 32 or the suspension member (support base) 2 as it is. Since the power unit P vibrates in various directions, in the rubber bush member 3, the outer cylinder 31 actually vibrates three-dimensionally with respect to the inner cylinder 32, including tilt vibration.

In the present embodiment, since the positioning convex portion 223 is provided on the inner surface of the lower surface portion 22 of the suspension member 2, as shown in FIGS. 5 and 6, the outer cylinder is caused by the relative vibration of the outer cylinder 31 with respect to the inner cylinder 32. The end 311 of 31 may try to collide with the positioning protrusion 223. In this case, the projecting piece portion 42 provided on the rubber elastic body 4 receives an external force from the positioning convex portion 223 and falls and deforms outward to cover the end portion 311 of the outer cylinder 31, and the outer cylinder 31 and the positioning convex portion 223. It is possible to create a state in which the projecting piece portion 42, which is a part of the rubber elastic body 4, is interposed between the and. As a result, it is possible to suppress the generation of impact and abnormal noise due to the outer cylinder 31 directly colliding with the positioning convex portion 223.

Further, in the present embodiment, since a plurality of protrusions 421 are further formed on the projecting piece portion 42, the plurality of protrusions 421 form the inner surface of the lower surface portion 22 of the suspension member 2 like a brush when the outer cylinder 31 vibrates. It is possible to sweep and scrape out the dust accumulated in the suspension member 2.

As can be seen from the above description, in the rubber bush member 3 having the above configuration, the projecting piece portion 42 projects in the axial direction of the outer cylinder 31 and does not cover the end portion 311 of the outer cylinder 31. When the outer cylinder 31 is press-fitted into the cylinder portion 11 of the torque rod 1, a situation in which a part of the rubber elastic body 4 does not bite between the outer cylinder 31 and the cylinder portion 11 does not occur. As a result, the performance of the rubber bush member 3 does not vary due to forcible deformation of a part of the rubber elastic body 4 at the time of press fitting.

Further, in the rubber bush member 3 having the above configuration, when the outer cylinder 31 tries to interfere with the suspension member (support base) 2, it is sandwiched between the outer cylinder 31 and the suspension member (support base) 2. Since the projecting piece portion 42 is tilted and deformed, the impact at the time of contact between the outer cylinder 31 and the suspension member (support base) 2 can be alleviated, and the generation of abnormal noise can be suppressed. Further, since it is possible to solve the problem at the time of interference between the outer cylinder 31 and the suspension member (support base) 2 without shortening the axial dimension of the outer cylinder 31, the necessary volume of the rubber elastic body 4 is secured. Therefore, the degree of freedom in the elastic characteristics of the rubber bush member 3 can be maintained.

Of course, the present invention is not limited to the above-described embodiment, and any modification within the scope of the matters described in the claims is included in the scope of the present invention.

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In the embodiment , the protruding piece portion 42 of the rubber elastic body 4 is formed in a part of the circumferential direction of the outer cylinder 31, but it may be formed over the entire circumferential direction.

P Vehicle power unit A Horizontal axis s Gap 1 Torque rod 11 Cylinder 2 Suspension member (support base)
21 Top surface 211 Bolt through hole 22 Bottom surface 222 Bolt through hole 223 Positioning convex part 23 Front part 231 Opening 24 Rear surface part 25 Bolt 26 Nut 3 Rubber bush member 31 Outer cylinder 311 End part 32 Inner cylinder 321 Center hole 4 Rubber elastic body 41 Currant part 42 Projection part 421 Protrusion

Claims (1)

It is a support structure of the vehicle power unit that supports the vehicle power unit to the vehicle body side support base via the rubber bush member.
The rubber bush member has an outer cylinder, an inner cylinder, and a rubber elastic body interposed between them, and the rubber elastic body has at least an inner circumference at an end portion of the outer cylinder. While facing a part of the outer cylinder, a projecting piece portion is formed which protrudes outward in the axial direction of the outer cylinder by a predetermined length from the end portion of the outer cylinder and can be tilted and deformed in the radial direction of the outer cylinder .
The protrusion amount of the protruding piece portion is set so that the end portion of the outer cylinder can be covered when the protruding piece portion is tilted and deformed in the radial direction of the outer cylinder.
The support base is provided with an inclined surface that guides the projecting piece portion and causes it to fall and deform toward the end portion side of the outer cylinder when it comes into contact with the projecting piece portion. Support structure .

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