JPH0632494Y2 - Anti-rotation device for bolts for fixing the engine to the engine mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for preventing rotation of an engine fixing bolt to an engine mount.

<Presupposed Structure> The present invention relates to a structure having the following presupposed structure.

For example, as shown in FIG. 1, FIG. 10 and FIG. 11, a bolt insertion hole 3 is opened in the engine support portion 2 of the engine mount 1 and the leg screw of the engine fixing bolt 4 in the inverted posture is inserted in the bolt insertion hole 3. Insert the part 5 from below and project upwards,
The present invention relates to a structure in which the head portion 6 of the bolt 4 can be contacted with the engine support portion 2 from below and the bolt head portion 6 is prevented from rotating on the engine mount 1 by the rotation stopping means 7.

<Prior Art> Conventionally, in the above-mentioned premise structure, the engine fixing bolt 4
Conventional means A and conventional technology B are available as means for preventing the head 6 of the vehicle from rotating on the engine mount 1.

Prior Art A (see FIG. 11) The head portion 6 of the bolt 4 is directly welded (A portion) to the lower surface of the engine support portion 2 to prevent rotation.

Prior Art B (see FIG. 12) The bolt fixing member 13 is fixed to the lower surface of the engine support portion 2 by welding (A portion), and the head 6 of the bolt 4 is welded to the lower surface of the bolt fixing member 13 (A portion). ) And stop the rotation.

<Problems to be Solved by the Invention> However, the above-mentioned conventional techniques A and B have the following problems.

Problems of Prior Art A (1) When welding the bolt head 6 to the engine support 2,
Material deterioration occurs in the engine support portion 2 and the bolt head portion 6 due to the heat influence. Moreover, vibrations during engine operation concentrate as alternating bending stress in the welds.

For this reason, the welded portion is easily cracked or damaged, resulting in poor durability.

Problems of Prior Art B (2) When the bolt fixing member 13 is welded to the engine supporting portion 2 near the bolt insertion hole 3, material deterioration occurs in the engine supporting portion 2 due to the heat effect thereof. Moreover, vibrations during engine operation concentrate as alternating bending stress in the welds.

For this reason, the welded portion is easily cracked or damaged, resulting in poor durability.

(3) When welding the engine support 2 and the bolt fixing member 13, the engine support 2 is distorted due to the influence of heat, and the adhesion between the two is deteriorated. Moreover, since the bolt 4 is fixed to the engine support portion 2 via the bolt fixing member 13, fretting occurs.

An object of the present invention is to prevent cracking / damage of an engine mount and eliminate fretting.

<Means for Solving the Problems> In order to achieve the above object, the present invention is configured as shown in FIGS. 1 and 7, for example.

That is, according to the first invention of the present application, the detent means 7 comprises the bolt collar portion 8 and the bolt detent member 9, and the bolt collar portion 8
Is formed by integrally projecting in the radial direction from the upper part of the peripheral surface of the head portion 6 of the bolt 4 in the inverted posture, and the bolt head portion 6 can be contacted with the engine support portion 2 from below via the bolt collar portion 8. West,
The bolt detent member 9 has a detent fitting hole 10, and the detent fitting hole 10 is fitted to the peripheral surface of the bolt head 6 in a detent manner, and on the hole peripheral wall portion 11 of the detent fitting hole 10. In the state where the bolt collar portion 8 is received by the engine, the bolt rotation preventing member 9 is supported by the engine mount 1 in a rotation preventing manner.

In the second invention, the rotation stopping means 7 is the bolt fixing member 1
3, the bolt fixing member 13 has a bolt through hole 14 and a supported portion 15, and the leg screw portion 5 of the bolt 4 in the inverted posture is penetrated from the bottom through the bolt through hole 14 and protruded upward. Then, the bolt head 6 is brought into contact with and welded to the lower surface of the hole peripheral wall portion 16 of the bolt through hole 14, and the bolt fixing member 1
3 is slidably abutted on the lower surface of the engine supporting portion 2, and the supported portion 15 is engaged with a supporting portion 17 attached to the engine mounting base 1 and supported in a fall prevention manner.

<Effect> Since the present invention is configured as described above, it has the following effects.

Effects of the first invention (a) The peripheral surface of the bolt head is fitted into the anti-rotation fitting hole of the bolt anti-rotation member while the bolt peripheral portion of the anti-rotation fitting hole receives the bolt collar portion from below. It is a structure to stop,
Since the bolt anti-rotation member can be supported at any place on the engine mount, the engine support and bolt heads will not deteriorate due to heat, and the engine support and bolt heads will not be subject to alternating bending stress. It does not work either.

In addition, since the bolt flange that is formed on the peripheral surface of the bolt head increases the contact surface of the bolt with the engine support part, the surface pressure between the engine support part and the bolt decreases, and the tightening stress that acts on both parts is reduced. Becomes smaller.

For this reason, the durability of the engine support portion at the portion where the bolt is prevented from rotating is improved, and the engine mount can be prevented from cracking or breaking.

(B) Since the bolt detent member can be supported at any place on the engine mount, the tightening stress at the time of bolt tightening is not concentrated on this support part, the durability of this support part is improved and the engine mount Can prevent cracks and damage.

(C) Since the bolt collar is integrally formed on the head of the bolt, and the engine support and the bolt collar are not distorted by heat, the contact surface between the engine support and the bolt collar is not affected. Adhesion is good and fretting can be prevented.

Effect of the Second Invention (ii) The structure in which the bolts are prevented from rotating without welding the bolt fixing members and the bolt heads to the engine mount (engine support part), the engine support part is deteriorated due to the heat. In addition, the alternating bending stress does not act on the engine support portion.

For this reason, the durability of the engine support portion at the portion where the bolt is prevented from rotating is improved, and the engine mount can be prevented from cracking or breaking.

(B) Since the structure is such that the supported portion of the bolt fixing member is engaged with and supported by the support portion attached to the engine mount, the engagement / support portion does not deteriorate due to heat, The tightening stress at the time of tightening the bolt is not concentrated on the part.

Therefore, the durability of the engagement / support portion is improved, and the engine mount can be prevented from cracking / damage.

(Ha) The engine support is not distorted by heat, the contact surface between the engine support and the bolt fixing member is good, and the bolt fixing member is slidably contacted with the engine supporting part. Therefore, fretting can be prevented.

<Embodiment> First, an embodiment of the first invention of the present application will be described with reference to FIGS.

A bolt insertion hole 3 is formed in an engine support portion 2 of an engine mounting base 1 of an engine work machine or the like, and a leg screw portion 5 of an engine fixing bolt 4 is inserted from the bottom into the bolt insertion hole 3 so as to face upward. By projecting, the engine fixing bolt 4 is assembled to the engine support portion 2 in an inverted posture.

Further, a rotation stopping means 7 for stopping rotation of the head 6 of the bolt 4 is attached to the lower portion of the engine mount 1.

In the first invention, the detent means 7 is a bolt detent member in which a detent portion 8 is integrally formed in the upper portion of the peripheral surface of the head 6 of the bolt 4 in the radial direction and a detent fitting hole 10 is formed. It is composed of nine.

At the time of assembling, the bolt fitting hole 10 is inserted from below into the head 6 of the bolt 4 in the inverted posture, and the peripheral surface of the bolt head 6 is fitted into the rotation stopping fitting hole 10 while preventing rotation. The bolt flange portion 8 is received from below by the hole peripheral wall portion 11 of the stopper fitting hole 10, and the end portion of the bolt rotation preventing member 9 is welded to the engine mount 1 (A portion). Then, when the bolt 4 is tightened, the bolt head 6 can come into contact with the engine support portion 2 via the bolt collar portion 8.

FIGS. 3 and 4 show that two bolts 4 are supported by one bolt detent member 9. In FIG. 3, both ends of the bolt detent member 9 are attached to the engine mount 1.
4 is welded to the engine mounting base 1. In FIG. 4, the central portion of the bolt detent member 9 is welded to the engine mount 1 (A portion).
It was done.

5 and 6, as means for supporting the bolt detent member 9 on the engine mount 1, one that utilizes elastic deformation of both ends of the bolt detent member 9 is shown. In FIG. 6, the engaging portions 12 are formed at both ends of the bolt detent member 9. In FIG. 6, the end of the engine mount 1 is formed in an inclined shape, and the end of the bolt detent member 9 is formed at this inclined position. The parts are elastically engaged. (In FIGS. 5 and 6, the imaginary line shows the state before assembly.) In FIGS. 5 and 6, the assembly of the bolt rotation preventing member 9 becomes easy.

Next, an embodiment of the second invention will be described with reference to FIGS. 7 to 9.

In the second invention, the rotation stopping means 7 is composed of the bolt fixing member 13.

The bolt fixing member 13 has a bolt through hole 14 and a supported portion 1
5 is formed, and the engine mount 1 has a support portion 17 formed by bending one end thereof.

At the time of assembly, the bolt through hole 14 of the bolt fixing member 13
Weld the bolt head 6 to the lower surface of the hole peripheral wall portion 16 (A portion)
Then, the supported portion 15 of the bolt fixing member 13 is supported in a fall prevention manner, and the bolt fixing member 13 is slidably brought into contact with the lower surface of the engine supporting portion 2.

In FIG. 8, the contact portion 1 is attached to the support portion 17 of the engine mount 1.
8 is attached to this, and the supported portion 15 of the bolt fixing member 13 is attached thereto.
Has been accepted.

Further, in FIG. 9, as a means for supporting the bolt fixing member 13 on the support portion 17 of the engine mount 1, one that utilizes elastic deformation of both ends of the bolt fixing member 13 is shown. Engaging portions 19 are formed at both ends. (The virtual line shows the state before assembly.)

[Brief description of drawings]

1 to 6 show an embodiment of the first invention of the present application, FIG. 1 is an enlarged sectional view of an essential part, FIG. 2 is a plan view seen from the arrow B, and FIGS. 3 to 5 are FIG. 6 is a schematic sectional view of another embodiment, and FIG. 6 is an enlarged sectional view of an essential part of another embodiment. FIGS. 7 to 9 show an embodiment of the second invention of the present application, and FIG. FIG. 8 is equivalent to FIG. 8, and FIG. 8 is equivalent to FIG. 1 of another embodiment.
FIG. 10 is a schematic sectional view of another embodiment, and FIGS.
FIG. 10 shows a conventional example, FIG. 10 is a schematic view of an engine mount, and FIGS. 11 and 12 are views corresponding to FIG. 1, respectively. 1 ... Engine mount, 2 ... Engine support, 3 ...
Bolt insertion hole, 4 …… Engine fixing bolt, 5 …… 4
Leg screw portion, 6 ... 4 head portion, 7 ... rotation preventing means, 8
...... Bolt collar, 9 ...... Bolt detent member, 13 ......
Bolt fixing member.

Claims (2)

[Scope of utility model registration request] 1. A bolt insertion hole (3) is opened in an engine support portion (2) of an engine mount (1), and a leg screw portion (4) of an engine fixing bolt (4) in an inverted posture is formed in the bolt insertion hole (3). 5) Insert it from below and project it upwards so that the head (6) of the bolt (4) can abut on the engine support (2) from below, and the bolt head (6) can be prevented from rotating. (7)
In the anti-rotation device for the bolts for fixing the engine to the engine mount, which is configured to prevent rotation on the engine mount (1), the anti-rotation means (7) includes the bolt collar (8) and the bolt anti-rotation member.
The bolt collar (8) is formed by integrally projecting in the radial direction from the upper part of the peripheral surface of the head (6) of the bolt (4) in the inverted position, and the bolt head (6). ) Through the bolt collar (8) to the engine support
It can be contacted with (2) from below, and the bolt rotation stop member (9) has a rotation stop fitting hole (10).
The non-rotating fitting hole (10) is fitted to the peripheral surface of the bolt head (6) in the non-rotating manner, and also the hole peripheral wall portion (11) of the non-turning fitting hole (10).
Fixing the engine to the engine mount, characterized in that the bolt locking member (9) is supported by the engine mount (1) in a non-rotating manner while the bolt collar (8) is received on top. Bolt stop device. 2. A bolt insertion hole (3) is formed in the engine support portion (2) of the engine mount (1), and a leg screw portion (4) of the engine fixing bolt (4) in an inverted posture is formed in the bolt insertion hole (3). 5) Insert it from below and project it upwards so that the head (6) of the bolt (4) can abut on the engine support (2) from below, and the bolt head (6) can be prevented from rotating. (7)
In the anti-rotation device for the bolt for fixing the engine to the engine mount, which is configured to prevent rotation on the engine mount (1), the detent means (7) is composed of the bolt fixing member (13), and the bolt fixing member (13) 13) is the bolt through hole (14) and the supported part (15)
And the leg screw part (5) of the inverted bolt (4) in the bolt through hole (14).
With the bolt penetrating from the bottom and protruding upward, weld the bolt head (6) to the lower surface of the hole peripheral wall portion (16) of the bolt through hole (14) by welding, and fix the bolt fixing member (13). Slidably abut the lower surface of the engine support (2), and the supported part (15) engages the support (17) attached to the engine mount (1) to support it in a fall-proof manner. A device to prevent rotation of the engine fixing bolt to the engine mount.