JP2001027285A - Power plant mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a dislocation phenomenon by clamping both ends of an inner cylinder of a buffer bush under appropriate, uniform surface pressure distribution. SOLUTION: In order to apply the clamping axial force of a fixing bolt 15 directly to an inner cylinder 16 of a buffer bush 13, it is so constituted that a part of a head of the fixing bolt 15 or a part of a nut 21 into which the fixing bolt 15 is screwed, is movable in a through hole of a fitting member and that a compressed member 27 is clamped between a connecting body 26 and fitting pieces 11, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In order to support a power plant of an automobile on a vehicle body, a cylindrical buffer bush is interposed. The present invention relates to a mounting device used for such a support portion.

[0002]

2. Description of the Related Art A general structure of a power plant 1 will be described with reference to FIG. 6. A power plant 1 mainly includes an engine 2, a transmission 3, and a differential device 4, and a subframe firmly fixed to a vehicle body 5. 6 is supported. A mounting device for supporting the power plant 1 is indicated by reference numeral 7, and is installed at three places here.

As one of the prior arts relating to the present invention, there is Japanese Utility Model Laid-Open No. 5-74947. The main points are as shown in FIGS. 7 and 8.
Shows a state before assembly, and a bracket 8 is firmly fixed to the side wall of the transmission 3 with bolts 9, 9. The bracket 8 includes a pair of mounting pieces 1 on a substrate 10 as a base member.
The base plate 10 and the mounting pieces 11, 11 are made of a thick steel plate. This substrate 10
The above-mentioned bolts 9 and 9 pass through. Mounting pieces 11, 1
One opposed inner surfaces 12, 12 are in a substantially parallel relative positional relationship.

A fixed arm 14 is attached to a cylindrical buffer bush 13.
The arm 14 is connected to the stationary member side of the vehicle body, that is, the sub-frame 6 in FIG. The buffer bush 13 is inserted between the mounting pieces 11 and 11 and is connected to the bracket 8 with fixing bolts 15.

[0005] The buffer bush 13 has an inner cylinder 16 having a circular cross section.
Between the outer cylinder 17 having a circular cross section and the cushioning rubber 18 having an annular cross section.
This rubber is integrated with the inner cylinder 16 and the outer cylinder 17 by vulcanization bonding. The fixed arm 14 is welded to the support cylinder 19, and the outer cylinder 17 is firmly pressed into the support cylinder 19 so that the fixed arm 14 and the buffer bush 1 are
3 is achieved.

[0006] Through holes 20, 20 are formed in the mounting pieces 11, 11, and the fixing bolt 15 passes through the through hole 20 of the mounting piece 11 on one side, the inner cylinder 16, and the through hole 20 of the mounting piece on the other side. Screwed into the nut 21. This nut is previously welded to the side surface of the mounting piece 11. Buffer bush 1
In order to insert 3 between the mounting pieces 11, 11, a gap required for the insertion is set. This is (ab) as is clear from FIG. 7, and if it is a mini vehicle level,
Usually, it is 0.5 mm to 1.5 mm. Since there is such an allowance (ab), when the fixing bolt 15 is strongly tightened into the nut 21, the mounting pieces 11, 11 are deformed into a shape as drawn toward each other as shown in FIG. Both end surfaces of the inner cylinder 16 are strongly sandwiched between the inner surfaces 12 and 12. FIG. 8 is exaggerated for ease of understanding.

[0007]

Since the bracket 8 is a component for supporting the power plant 1 having a high mass, the strength and rigidity are set to be extremely high.
The rigidity is provided so that the interval between 1 and 11 is not easily reduced. Therefore, the fixing bolt 1 is fixed at a predetermined torque.
No. 5 due to variations in part dimensions, etc.
-B) exceeds the control width, the inner surface 12 of the mounting piece and the inner cylinder 1
The state of contact between the end face 22 and the end face 22 does not become a uniform surface pressure over the entire area of the contact face, but becomes a so-called one-sided state. When illustrated extremely, a gap may be formed as shown in FIG. With such poor adhesion, when a remarkably large rotational force or a vertical force is applied to the buffer bush 13, the inner surface 12 of the mounting piece 11 and the inner surface 12 of the mounting piece 11 are not completely deformed without the cushion rubber 18 performing a predetermined elastic deformation. "Displacement" in the contact portion with the end face 22 of the cylinder
Are generated, and the repetition of the above causes the abrasion of the contact portion to progress. If the contact portion is in an excessive state, a gap is formed, which causes abnormal noise.

[0008]

SUMMARY OF THE INVENTION The present invention has been provided to solve the above-mentioned problems.
It is not such that the bolt axial force overcomes the rigidity of both mounting pieces, but rather, the basic idea is to apply the minimum necessary bolt axial force to both mounting pieces. Also,
In this invention, the bracket is not on the power plant side,
This also includes the case where the fixing member is fixed to the stationary member side of the vehicle body, that is, the case opposite to that shown in FIG.

According to the first aspect of the present invention, a bracket having a pair of mounting pieces is fixed to a power plant side or a stationary member side of a vehicle body, and opposing inner surfaces of the mounting pieces have a substantially parallel relative positional relationship. A cylindrical buffer bush fixed to the stationary member side or the power plant side is inserted between the mounting pieces, a fixing bolt is passed through the through hole of the mounting piece and the inner cylinder of the buffer bush, and the fixing bolt is screwed into the nut. In a type in which the buffer bush is attached to the bracket by sandwiching the inner cylinder between the mounting pieces, a coupling body of the fixing bolt and the nut in order to directly apply the tightening axial force of the fixing bolt to the end surface of the inner cylinder. Is characterized in that the shape of the through hole portion is set so as to be movable with respect to the through hole, and a member to be compressed which is compressed by the tightening axial force is provided.

Therefore, the tightening axial force of the fixing bolt acts on the inner cylinder, and one end of the inner cylinder is pressed against the inner surface of the mounting piece, and the other end of the inner cylinder is pressed against a part of the combined body of the fixing bolt and the nut. In addition, since the member to be compressed undergoes elastic deformation, screwing displacement of the fixing bolt into the nut is permitted, and also, dimensional variations of parts are absorbed. By receiving the compression reaction force of the member to be compressed, the press-contact state between the combined body and the mounting piece is maintained.

According to a second aspect of the present invention, in the first aspect, one end surface of the inner cylinder is abutted against the inner surface of any one of the mounting pieces, and the other end surface of the inner cylinder is formed of a nut into which the fixing bolt is screwed. The present invention is characterized in that a member to be compressed is abutted against a part or a part of the head of the fixing bolt, and that a member to be compressed is interposed between the nut or the head and the mounting piece. Therefore, the tightening axial force of the fixing bolt acts on the inner cylinder, one end of the inner cylinder is pressed against the inner surface of the mounting piece, and the other end of the inner cylinder is pressed against a part of the combined body of the fixing bolt and the nut. When the compressed member undergoes elastic deformation, the displacement of the fixing bolt into the nut is allowed, and the dimensional variation of the parts is absorbed. Under the compression reaction force of the member to be compressed,
The press-contact state between the joint and the mounting piece is maintained.

A third aspect of the present invention is characterized in that, in the first aspect, a part of the nut or a part of the head of the fixing bolt is configured to be able to enter a through hole formed in the mounting piece. I have. Therefore, the above-described operation is performed.

According to a fourth aspect of the present invention, a bracket having a pair of mounting pieces is fixed to a power plant side or a stationary member side of a vehicle body, and opposing inner surfaces of the mounting pieces have a substantially parallel relative positional relationship. A cylindrical buffer bush fixed to the stationary member side or the power plant side is inserted between the mounting pieces, a fixing bolt is passed through the through hole of the mounting piece and the inner cylinder of the buffer bush, and the fixing bolt is screwed into the nut. In a type in which the inner cylinder is sandwiched between the mounting pieces and the buffer bush is mounted on the bracket, the mounting pieces are cast into a base member made of casting and are bent by the tightening axial force of the fixing bolt. It is characterized by being constituted by a plate member that can be used.

Therefore, the cast base member secures the basic strength as a bracket, while the plate member is deformed according to the gap between the buffer bush and the inner surface of the mounting piece and the end surface of the inner cylinder. Is maintained in an appropriate state. Therefore, the minimum necessary bolt axial force is applied to the mounting piece.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. Members having the same functions as those described in FIGS. 6 to 9 are denoted by the same reference numerals in the drawings, and detailed description is omitted. The through hole on the left side is a two-stage hole composed of a circular large-diameter hole 20a and a circular small-diameter hole 20b. The nut 21 arranged therein is composed of a flange portion 23 that enters the large-diameter hole 20a, and a cylindrical portion 24 that abuts against the end surface of the inner cylinder 16 and penetrates the small-diameter hole 20b.
A pin 25 is driven into the mounting piece 11 to prevent the nut 21 from rotating. By such a combination of the two-stage hole and the nut shape, the combined body 26 of the fixing bolt 15 and the nut 21 can move with respect to the through hole 20 (20a, 20b).

The member to be compressed 27 is disposed between the flange portion 23 and the mounting piece 11, and has a high compressive force such as hard rubber, spring parts made of spring steel, copper alloy, and aluminum alloy. It is an elastic body that exerts an elastic reaction force, and has a ring shape. In FIG. 1, the member to be compressed 27 may be disposed between the head of the bolt 15 and the mounting piece 11.

The operation and effect of the above embodiment will be described. When the fixing bolt 15 is screwed into the nut 21, the flange portion 23 compresses the member to be compressed 27 while the cylindrical portion 24 is compressed.
Moves to the right and makes strong contact with the end face of the inner cylinder 16. Thereby, one end of the inner cylinder 16 is pressed against the inner surface 12 of the right mounting piece, and the inner cylinder 16 is strongly sandwiched from both sides. Then, the inner surface of the head of the fixing bolt 15 and the right side surface of the mounting piece are pressed against each other by the compression reaction force of the member to be compressed 27. Similarly, the compression reaction force causes the flange portion 23 and the left mounting piece 11 to be pressed against each other.

The manufacturing error of the length of the inner cylinder 16, the mounting piece 11,
Even if there is a manufacturing error of the interval length of 11, the compressed member 2
When the cylindrical member 24 is pressed against the end face of the inner cylinder 16 while the member to be compressed 27 is compressed, proper assembly is completed. In this completed state, by applying a predetermined tightening torque to the fixing bolt 15, the pressing force acting on both ends of the inner cylinder 16 is set to a predetermined value, and the elastic reaction force of the compressed member 27 The press-contact state of the joint 26 to the mounting piece 11 is also set appropriately.

The fact that the "combined body of fixing bolt and nut" can move with respect to the through hole of the mounting piece can also be realized by the embodiment as shown in FIG. This allows a part of the head 28 of the fixing bolt 15 to enter the through hole 20. Here, an insert member 29 is employed to streamline component processing. The member 29 includes a cylindrical portion 30 and a flange portion 31 integrated therewith. The fixing bolt 15 penetrates through the inside of the cylindrical portion 30, enters the through hole 20 having an increased inner diameter, and comes into contact with the end surface of the inner cylinder 16. A member to be compressed 27 is sandwiched between the flange portion 31 and the mounting piece 11. The nut 21 is welded to the mounting piece 11. In addition, as will be apparent from the operation and effect described later, in this embodiment, the head 28 and the insertion member 29 may be manufactured integrally.

The operation and effect of this embodiment are the same as those described above. That is, by applying a predetermined tightening torque to the fixing bolt 15, the press-contact force acting on both ends of the inner cylinder 16 is set to a predetermined value.
By the elastic reaction force of 7, the press-contact state of the joint body 26 against the mounting piece 11 is also set appropriately.

FIG. 4 shows another example of the member to be compressed. The two-dot chain line shows the shape of the member 27, and the solid line shows a conical spring made of spring steel.

The embodiment of FIG. 5 responds to the above-mentioned problem by changing the idea. Here, the bracket 8 itself is rigidly manufactured as before, but in order to cope with the above (a-b), the mounting piece is configured to be able to be bent by the tightening axial force of the fixing bolt. That is, the base member 32 of the bracket 8 is made of cast aluminum, and the mounting pieces 11 are cast into the base member 32. The mounting pieces 11, 11 are formed as plate members made of a steel plate that can be bent by the fastening axial force of the fixing bolt 15, and a hole 33 is formed in the plate member to increase the casting strength. Note that the buffer bush 13 and the fixing bolt 15 here are shown in FIG.
Is the same as

The operation and effect of this embodiment will be described. The bracket 8 itself provides high strength stiffness, which requires that the base member 32 be sufficiently reinforced. Here, since the base member 32 is a cast product,
The rigidity of attachment to the transmission 3 can be kept high.
And since the attachment pieces 11 and 11 are cast into the base member, the coupling rigidity of the attachment pieces 11 and 11 to the base member can be set high. Since the attachment pieces 11 and 11 are provided with flexibility, by tightening the fixing bolt 15, both end surfaces of the inner cylinder are pressed against the inner surfaces of both the attachment pieces with uniform pressure. Therefore, the "shift" phenomenon as described in the related art does not occur.

[0024]

According to the present invention, when the fixing bolt is screwed into the nut, while the member to be compressed is compressed, the combined body of the fixing bolt and the nut moves with respect to the through hole of the mounting piece, and A part or a part of the head of the fixing bolt directly contacts the inner cylinder of the buffer bush. By doing so, one end of the inner cylinder is pressed against the inner surface of the mounting piece on one side, and the other end of the inner cylinder is pushed by a part of the nut or a part of the head of the fixing bolt. Is strongly pinched from.
Then, a pressure contact is made between a part of the combined body and the mounting piece by the compression reaction force of the member to be compressed. Therefore, even if there is an abnormal variation in the above (ab), the compressed member absorbs the variation, and it is possible to sandwich both ends of the inner cylinder of the buffer bush under an appropriate and uniform surface pressure distribution. Thus, the above-described “shift” phenomenon can be avoided.

By preventing the above-mentioned "displacement", the elastic body of the buffer bush is sufficiently deformed, so that the vibration noise from the power plant can be effectively shut off.

In the completed state of the assembly, by applying a predetermined tightening torque to the fixing bolt, the pressing force acting on both ends of the inner cylinder is set to a predetermined value, and the assembly quality is maintained at a good level. Becomes possible. Also, the pressure contact state of the combined body to the mounting piece is properly set by the elastic reaction force of the member to be compressed.

The bracket itself provides high strength stiffness, which requires that the base member be sufficiently reinforced. Here, since the base member is a cast product, the rigidity of attachment to the power plant or the vehicle body stationary member can be maintained high. Since the mounting piece is cast into the base member, the coupling rigidity of the mounting piece to the base member can be set high. Since the attachment piece is provided with flexibility, by tightening the fixing bolt, both end surfaces of the inner cylinder are pressed against the inner surfaces of both attachment pieces with uniform pressure. Therefore, the "shift" phenomenon as described in the related art is prevented, and the function of the buffer bush is sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of the present invention.

FIG. 2 is a partial front view of that of FIG.

FIG. 3 is a partial cross-sectional plan view showing another embodiment.

FIG. 4 is a cross-sectional plan view showing a modification of a member to be compressed.

FIG. 5 is a cross-sectional plan view showing only a main part of another embodiment.

FIG. 6 is a plan view showing a mounted state of the power plant.

FIG. 7 is a cross-sectional plan view showing a state before assembly according to the related art.

8 is a cross-sectional plan view showing the state of FIG. 7 after assembly.

FIG. 9 is a partial cross-sectional plan view exaggeratingly showing a contact state between an inner surface of the mounting piece and an end surface of the inner cylinder.

[Explanation of symbols]

 11, 11 Mounting piece 8 Bracket 1 Power plant 6 Body stationary member 12, 12 Inner surface 13 Buffer bush 15 Fixing bolt 20, 20 Through hole 16 Inner cylinder 21 Nut 26 Combined body 27 Compressed member 32 Base member 11, 11 Plate member

Claims (4)

[Claims] 1. A bracket having a pair of mounting pieces is fixed to a power plant side or a stationary member side of a vehicle body, and opposed inner surfaces of the mounting pieces have a substantially parallel relative positional relationship.
A cylindrical buffer bush fixed to the stationary member side or power plant side of the vehicle body is inserted between the mounting pieces, and a fixing bolt is passed through the through hole of the mounting piece and the inner cylinder of the buffer bush,
In the type in which the buffer bush is attached to the bracket by screwing the fixing bolt into the nut and holding the inner cylinder between the mounting pieces, the fixing bolt is used to directly apply the tightening axial force of the fixing bolt to the end surface of the inner cylinder. The shape of the through-hole portion is set so that the combined body of the nut and the nut can move with respect to the through-hole, and a member to be compressed which is compressed by the tightening axial force is provided. Mounting device. 2. The inner cylinder according to claim 1, wherein one end surface of the inner cylinder is abutted against the inner surface of one of the mounting pieces, and the other end surface of the inner cylinder is a part of a nut or a fixing bolt into which the fixing bolt is screwed. A mounting device for a power plant, characterized in that a member to be compressed is abutted against a part of the head and a compressed member is interposed between the nut or the head and the mounting piece. 3. The power plant mount according to claim 1, wherein a part of the nut or a part of the head of the fixing bolt is configured to be able to enter a through hole formed in the mounting piece. apparatus. 4. A bracket having a pair of mounting pieces is fixed to a power plant side or a stationary member side of a vehicle body, and opposing inner surfaces of the mounting pieces have a substantially parallel relative positional relationship.
A cylindrical buffer bush fixed to the stationary member side or power plant side of the vehicle body is inserted between the mounting pieces, and a fixing bolt is passed through the through hole of the mounting piece and the inner cylinder of the buffer bush,
In a type in which the fixing bolt is screwed into the nut and the inner cylinder is sandwiched between the mounting pieces and the buffer bush is mounted on the bracket, the mounting piece is cast into a base member made of a casting, and A power plant mounting device comprising a plate member that can be bent by a tightening axial force.