JPH05288208A - Engine mount bracket - Google Patents

Abstract

PURPOSE:To provide an engine mount bracket so designed as to be capable of absorbing errors in the pitch between bolt holes while securing an anti-slip function. CONSTITUTION:A bolt hole 131 nearest to the point A of input of external forces F applied to a bracket 10 is a round one with no play for the bolt diameter 13a of a bolt inserted therein, and a bolt hole 141 farthest from the round hole is an oblong one extending along a straight line L connecting the two holes, with no play for the bolt diameter 14a of a bolt inserted therein, while another bolt hole 151 has play provided along its overall periphery for the bolt diameter 15a of a bolt inserted therein. The bolt holes with no play prevent slip, while the bolt hole provided with play absorbs errors in the pitch between the bolt holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine mount bracket for supporting an engine mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, an engine mounted on a vehicle is supported by a frame, which is a fixing member, through an engine mount bracket as an engine supporting device, as disclosed in Japanese Utility Model Laid-Open No. 60-73222. .. The engine mount bracket is provided with bolt holes at a plurality of positions, and bolts are inserted into the respective bolt holes to fasten the mating member. Each bolt hole is a so-called stupid hole having play (having backlash) with respect to the bolt diameter in order to absorb the pitch error between the holes.

[0003]

By the way, in the case of an engine mount bracket having a structure in which there is some play between the bolt hole and the diameter of the bolt to be inserted into the bolt hole, the bracket must be provided for input in the direction perpendicular to the bolt axis. It resists by the frictional force with the mating member to be fastened. However, if the input force in the perpendicular direction exceeds the limit of the frictional force due to engine vibration, vibration on a bad road, etc., the bolt may be loosened by repeating sliding in the perpendicular direction. Therefore, as a means for preventing this slippage, conventionally, all of the plurality of bolt holes have been so-called rattling with no play with respect to the shaft diameter of the bolt.

However, when all the plurality of bolt holes are loosened, it is necessary to increase the accuracy of the pitch between the bolt holes. Therefore, each bolt hole must be formed by machining, and when the engine mount bracket is manufactured by press molding or casting, the bolt hole cannot be processed at the same time, and the number of steps and setup are complicated and expensive. There was a problem.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and provides an engine mount bracket having a structure capable of absorbing the pitch error of the bolt holes while ensuring the above-mentioned function of preventing slippage. The purpose is to solve the conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, relates to an engine mount bracket for supporting an engine mounted on a vehicle through a plurality of bolts, in which a bolt hole closest to an input point has a bolt diameter. In contrast, a round hole with no play is defined.The bolt hole farthest from the round hole is a long hole that is long in the linear direction connecting these two holes and has no play in the orthogonal direction to the bolt diameter. The feature is that a play is provided for the bolt diameter over the circumference.

[0007]

[Operation] The bolt hole closest to the input point of the engine mount bracket has no play with the bolt over the entire circumference, and acts as a rotation axis against the input moment by the shear force of the bolt, providing a fulcrum function. Fulfill Since the bolt closest to the input point serves as the axis, the magnitude of the input moment becomes smaller.

The bolt hole farthest from the bolt serving as the shaft has no play between the bolt and the bolt in the rotation direction around the shaft bolt, and opposes the input moment by the shearing force of the bolt, so that the bolt member and the mating member are opposed to each other. Prevent relative slippage. Moreover, the play between the farthest bolt holes other than the rotation direction and the bolts provided in the entire circumferential direction of the other bolt holes may cause an error in mounting the mating member due to variations in the pitch between the bolt holes during manufacturing. Absorb.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the entire engine mount structure of a vehicle using an embodiment of the engine mount bracket of the present invention, and FIG. 2 is a perspective view of the embodiment of the engine mount bracket.

In FIG. 1, reference numeral 1 denotes an engine, which is attached to a vehicle body through a center center member 2 and side members 3 and 4 arranged on the left and right sides of the center member 2, respectively. The direction of arrow Fr is the front of the vehicle. The center member 2 extends in the vehicle front-rear direction and is fixed to the vehicle body at the attachment portions 2A and 2B at both front and rear ends. The left side member 3 in the figure includes the engine mount bracket 10 of the present invention. The engine mount bracket 10 has a cylindrical outer cylinder 11
It is attached to the vehicle body side via a vibration isolation member (not shown) built in the. On the other hand, a bolt mounting portion 12 is provided on the side surface of the outer cylinder 11 so as to support the engine 1 through a mating member 20 mounted with three bolts 13, 14 and 15.

The structure of the bolt holes for the bolts 13, 14, 15 of the engine mount bracket 10 will be described in detail with reference to FIG. To the outer cylinder 11 of the engine mount bracket 10, an external force due to a driving force of the engine, a weight load, etc. is applied as an input F in a direction orthogonal to the bolts 13, 14, and 15. Now, let A be a point on which the input F acts (hereinafter referred to as an input point). In the bolt mounting portion 12 of the engine mount bracket 10, three bolt holes 131, 141 and 151 corresponding to the three bolts 13, 14 and 15 for fastening the mating member 20 are provided. The holes are drilled in the orthogonal direction.

Among them, the bolt hole 1 closest to the input point A
Reference numeral 31 is formed as a rattling round hole having no play (play) with respect to the bolt diameter 13a of the bolt 13 to be inserted.
Further, the bolt hole 141 farthest from the bolt hole 131.
Is a long hole that is long in the direction of the straight line L that connects the bolt hole 131 and the bolt hole 141, and inserts the long diameter l _max of the bolt 1
It is formed larger than the bolt diameter 14a of No. 4. On the other hand, the hole diameter (minor diameter) l _min in the direction orthogonal to the straight line L is formed as rattling with no play (play) with respect to the bolt diameter 14a.

The remaining bolt hole 151 is formed as a round hole (so-called stupid hole) having a hole diameter larger than the bolt diameter 15a of the bolt 15 to be inserted to allow play in the entire circumferential direction. Next, the operation will be described. The bolt hole 131 closest to the input point A of the engine mount bracket 10 has no play with the bolt 13 over the entire circumference. for that reason,
The movement of the bolt 13 in the direction perpendicular to the axis is prevented. Even if the magnitude of the moment due to the input F (input moment) exceeds the limit of the frictional resistance with the mating member 20, the shearing force of the bolt 131 resists such a large input moment, It functions as a fulcrum of the rotating action by the moment. As described above, since the bolt 13 located closest to the input point A serves as the axis of rotation, the arm length l ₁ of the moment of the input F is when the bolt 14 located far from the input point A serves as the fulcrum of rotation. The input moment is small and the magnitude of input moment is small. By the way, when all the three bolt holes 131, 141, 151 are formed so as to have a backlash with respect to the bolt diameter, the bolt 14 at the position where the moment ratio becomes the largest becomes the fulcrum of the rotation action,
Even if the input F has the same magnitude, a larger moment is applied.

The bolt hole 141 is located at the farthest position from the bolt 13 which is the fulcrum of the rotation action, and the moment with the distance between the bolt holes 131 and 141 as the fulcrum and the arm length is the location of the bolt hole 141. Act on. However, even if the engine mount bracket 10 tries to rotate about the bolt 13 as a fulcrum by this, the bolt 14 and the bolt hole 141 are rattled in the rotation direction, so that the bolt 14 opposes by the shearing force to rotate. Be blocked. On the other hand, the bolt hole 141 is a long hole and the bolt hole 13
Although there is looseness in the direction of 1, the bolt holes 131 are loosened, so that the engine mount bracket 10 does not move and shift in that direction.

The mounting error due to the variation in the hole pitch of each bolt hole 131, 141, 151 is the remaining bolt hole 15.
It can be absorbed by the play in the entire circumferential direction between the bolt 1 and the bolt 15 inserted therein. Thus, according to the engine mount bracket 10 of this embodiment, the function of preventing relative sliding with the mating member can be ensured by the rattling structure of the bolt holes 131 and the bolt holes 141.

Regarding the pitch error of the bolt holes,
It can be absorbed by the stupid hole structure of the bolt hole 151. Therefore, in the process of press molding or casting the engine mount bracket 10, the bolt holes can be processed at the same time, and the man-hours and the setup can be simplified as compared with the case where all the bolt holes are machined, resulting in low cost manufacturing. can do. The positional relationship between the bolt holes 141 and 151 may be reversed.

Further, the number of bolt holes is not limited to three as in the above embodiment, and the present invention can be applied to the case of more bolt holes.

[0018]

As described above, in the engine mount bracket of the present invention, the bolt hole closest to the input point is a round hole having no play with respect to the bolt diameter, and the bolt hole farthest from the round hole is these two holes. A long hole that is long in the straight line connecting the holes and has no play in the orthogonal direction to the bolt diameter is provided, and other bolt holes are provided with play in the bolt diameter over the entire circumference. Therefore, it is possible to absorb the pitch error between the bolt holes while ensuring the relative slip prevention function with respect to the mounting member, and as a result, it is not necessary to specially machine the bolt holes in a separate process, and the cost can be provided at low cost. The effect is obtained.

[Brief description of drawings]

FIG. 1 is an overall plan view of an engine mount structure showing a mode of use of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

[Explanation of symbols]

 10 Engine Mount Bracket 13a Bolt Diameter 14a Bolt Diameter 15a Bolt Diameter 131 (Closest to Input Point) Bolt Hole 141 (Elongated) Bolt Hole 151 (Other) Bolt Hole

Claims (1)

[Claims] 1. An engine mount bracket for supporting an engine mounted on a vehicle through a plurality of bolts, wherein a bolt hole closest to an input point is a round hole having no play with respect to a bolt diameter, and is farthest from the round hole. The bolt holes are long holes that are long in the straight line connecting these two holes and have no play relative to the bolt diameter in the orthogonal direction, and the other bolt holes are provided with play over the entire circumference of the bolt diameter. Engine mount bracket to be used.