JP2000045915A - Manual engine starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manual starting with a start handle for manual starting even when a piston cannot exceed its compression top at manual starting. SOLUTION: A start handle 1 is mounted on a start shaft 2 to manually start an engine. When the start handle 1 is rotated in the positive direction, even if an abutting portion 18 of a lever 15 of rotation control means 12 abuts to an engaging rib 16 of an engine body, the abutting portion 18 tilts, thus allowing further positive rotation of the start handle 1. Accordingly, positive rotation of the start handle 1 is permitted. On the other hand, when the crankshaft rotates in the reverse direction due to insufficient rotating force of the start handle 1 and the abutting portion 18 abuts to the engaging rib 16, a rotation stopper 19 of the lever 15 abuts to the start handle 1. Thus, the start handle 1 is engaged with the engine body via the lever 15, thereby prohibiting the reverse rotation of the crankshaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual starting device for starting an engine by manually rotating a start shaft by a starting handle.

[0002]

2. Description of the Related Art A conventional manual starting device for an engine is constructed as follows. That is, a start shaft is linked to the crankshaft of the engine, and a start handle can be detachably mounted on the start shaft. Then, after the worker attaches the starting handle to the start shaft, the start shaft is rotated by manually rotating the starting handle manually, whereby the crankshaft is rotated and the engine is manually started. .

[0003]

In the manual starting device for an engine described above, when the starting handle is manually rotated by the starting handle and the rotational force of the starting handle is insufficient, the piston may exceed the compression top. The crankshaft tends to reverse due to the expansion force of the air compressed in the cylinder.

[0004] Therefore, the reverse rotation of the crankshaft is transmitted to the starting handle via the start shaft, making it difficult to rotate the starting handle forward. As a result, the starting operation by the starting handle cannot be performed smoothly. SUMMARY OF THE INVENTION It is an object of the present invention to prevent a crankshaft from reversing even when a compression top of a piston cannot be exceeded during a manual start so that a smooth manual start can be performed with a starting handle.

[0005]

Means for Solving the Problems [Invention of claim 1] The invention of claim 1 is, for example, shown in FIG.
As shown in FIG. 2 and FIG. 2, the configuration is as follows. The start handle (1) is mounted on the start shaft (2) interlocked with the crankshaft (5) of the engine, and the start shaft (2) is manually rotated by the start handle (1), so that the hand of the engine is turned on. In a manual starting device for an engine configured to perform starting, rotation restricting means for permitting normal rotation of the crankshaft (5) while prohibiting reverse rotation of the crankshaft (5).
(12) is provided.

[Invention of claim 2] The invention of claim 2 is the same as the above-mentioned invention of claim 1, but further configured as follows. The rotation regulating means (12) is a starting handle.
(1) or a swing shaft (14) arranged on the start shaft (2),
Lever (15) supported swingably by swing shaft (14)
And an engaging portion (16) provided on the engine body (4), and the lever (15) has a contact portion (18) with an intermediate portion (17) interposed therebetween.
And a stop portion (19). The contact portion (18) rises in the centrifugal direction of the start shaft (2) by centrifugal force generated by rotation of the starting handle (1), and is engaged with the locking portion (16). The rotation preventing portion (19) comes into contact with the starting handle (1) or the start shaft (2) only when the start shaft (2) rotates in the reverse direction, and the lever (15) This is configured so as to prevent the swinging.

[Invention of claim 3] The invention of claim 3 is the same as the above-mentioned invention of claim 2, but further configured as follows. Lever (15) attaches detent part (19) to weight part
(30), and the weight portion (30) is moved up in the centrifugal direction of the start shaft (2) by the centrifugal force when the starting handle (1) rotates forward, so that the contact portion (18) starts. (2) Fall to the side
While the starting handle (1) changes from the normal rotation state to the reverse rotation state while the starting handle (1) is changed from the normal rotation state to the reverse rotation state while the (18) and the locking portion (16) do not abut, the inertia force causes the start handle (1) to fall toward the start shaft (2). Touching part (18)
Is raised in the centrifugal direction of the start shaft (2).

[Invention of claim 4] The invention of claim 4 is the same as the above-mentioned invention of claim 1, but further configured as follows. The crankshaft (5) or a rotating member driven by the crankshaft (5) is provided with a rotation restricting means (12).

[Invention of claim 5] The invention of claim 5 is the one according to any one of claims 1 to 4, and further configured as follows. At least one of the locking portion (16) and the lever (15) is provided with elastic means, and when the contact portion (18) comes into contact with the locking portion (16) due to the reversal of the starting handle (1), the elastic portion is provided. The means is configured to elastically deform so as to reduce the impact force caused by the contact between the contact portion (18) and the locking portion (16). In addition, the elastic means,
It may be attached to the locking part (16) or the lever (15), but is not limited to this, and the locking part (16)
Alternatively, a part of the lever (15) may be constituted by the above-mentioned elastic means, or the locking portion (16) or the whole lever (15) may be constituted by the above-mentioned elastic means.

[0010]

The invention of claim 1 operates as follows, for example, as shown in FIGS. That is,
When the starting handle (1) is mounted on the start shaft (2) for manual starting of the engine and the engine is manually rotated forward, the rotation restricting means (12) is driven by the crank associated with the forward rotation of the start shaft (2). axis
By allowing forward rotation of (5), the starting handle (1)
As a result, the forward rotation of the crankshaft (5) can be continued, whereby the engine is manually started.

On the other hand, when the rotation force of the starting handle (1) is insufficient and the piston cannot exceed the compression top, the crankshaft (5) tends to reverse due to the expansion force of the air compressed in the cylinder. I do. In this case, the reverse rotation of the crankshaft (5) is prohibited by the rotation restricting means (12).

[Claim 2] The invention of claim 2 operates as follows. That is, when the starting handle (1) is mounted on the start shaft (2) and rotated forward for manual starting of the engine, the contact portion (18) of the lever (15) rises by centrifugal force. When the contact portion (18) comes into contact with the engaging portion (16) of the engine body (4), the engaging portion (18) is pushed by the engaging portion (16) and the start shaft ( 2) It falls to the side and the forward rotation of the starting handle (1) is not disturbed. Therefore, the manual rotation of the crankshaft (5) by the starting handle (1) can be continued.

On the other hand, when the rotation force of the starting handle (1) is insufficient and the crankshaft (5) is rotated in the reverse direction and the contact portion (18) comes into contact with the locking portion (16), the contact is made. The lever (15) attempts to swing due to the contact between the contact portion (18) and the locking portion (16). In this case, the rotation preventing portion (19) of the lever (15) is moved by the starting handle (1). ) Or the start shaft (2) to prevent the lever (15) from swinging. As a result, the starting handle (1) or the start shaft (2) is locked to the engine body (4) via the lever (15), and the reverse rotation of the crank shaft (5) is prevented.

[Claim 3] The invention of claim 3 operates as follows. That is, when the starting handle (1) is mounted on the start shaft (2) for manual start of the engine and is rotated forward, the weight (30) of the lever (25) is moved by the centrifugal force to the start shaft.
The contact portion (18) of the lever (25) falls down with the rising of the weight portion (30) in the centrifugal direction of (2). As a result, the contact portion (18) does not come into contact with the locking portion (16) of the engine body (4), and the forward rotation of the starting handle (1) is not hindered. Therefore, the crankshaft by the starting handle (1)
(5) Manual rotation can be continued.

On the other hand, when the rotation of the starting handle (1) is insufficient and the turning of the starting handle (1) is reversed from the normal rotation to the reverse rotation, the weight (30) is rotated forward by the inertia force. The contact portion (18) rises in accordance with the movement and falls down. And, the contact portion (18) is the engine body
When the weight (30) comes into contact with the starting handle (1) or the start shaft (2), the lever (15) is prevented from swinging. You. As a result, the starting handle (1) is locked to the engine body (4) via the lever (15), and the reverse rotation of the crankshaft (5) is prevented.

[Claim 4] The invention of claim 4 operates as follows. That is, by providing the rotation restricting means (12) directly on the crankshaft (5) or by providing the rotation restricting means (12) on a rotating member driven by the crankshaft (5), the engine can be started manually. The forward rotation of the crankshaft (5) can be continued by the starting handle (1), while the reverse rotation of the crankshaft (5) can be prohibited.

[Claim 5] The invention of claim 5 operates in the following manner in addition to the effects of the inventions of claims 1 to 4. That is, when the starting handle (1) is reversed and the contact portion (18) of the lever (15) comes into contact with the locking portion (16) of the engine body (4), the elastic means is elastically deformed. As a result, the contact portion (18) is elastically received by the locking portion (16), and the impact force caused by the contact between the contact portion (18) and the locking portion (16) is reduced.

[0018]

[Embodiment 1] The invention of the above-described embodiment 1 has the following effects because it is configured and operates as described above. If the crankshaft attempts to rotate in the reverse direction due to insufficient rotational force from the starting handle during manual starting, the reverse rotation of the crankshaft is prohibited by the rotation restricting means. Rolling is not disturbed,
As a result, a smooth manual start with the starting handle can be performed.

[Claim 2] The invention of claim 2 has the following effects in addition to the effects of the invention of claim 1 since it is configured and operates as described above. Since the rotation restricting means can be composed of relatively simple members such as the swing shaft, the lever and the locking part, it is possible to prohibit the reverse rotation of the crankshaft at the time of manual starting with the starting handle at a relatively low cost. it can.

[Claim 3] Since the invention of claim 3 is configured and operates as described above, it has the following effect in addition to the effect of the invention of claim 2 above. When the weight of the lever rises due to the centrifugal force during the forward rotation of the starting handle, the contact portion of the lever falls down, so that the contact portion of the lever does not contact the locking portion of the engine body during the forward rotation. In addition, it is possible to reliably prevent abrasion of the contact portion and the locking portion due to the contact between the contact portion and the locking portion, and also to surely prevent noise generated by the contact.

[Claim 4] The invention of claim 4 has the following effects because it is configured and operates as described above.
By providing the rotation restricting means on the crankshaft or the rotating member driven by the crankshaft, the reverse rotation of the crankshaft can be prohibited, so select a portion of the rotating member driven by the crankshaft or the crankshaft that has extra space. The above-mentioned rotation restricting means can be provided, whereby the degree of freedom in designing the engine can be increased.

[Claim 5] The invention of claim 5 has the following effects since it is configured and operates as described above.
Since the impact force due to the contact between the contact portion of the lever and the locking portion of the engine body is reduced by the elastic means, the impact is transmitted to the operator via the starting handle and causes discomfort. Can be reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a hand starting device for an engine according to the present invention will be described below with reference to FIGS. FIG. 1A shows a case where the starting handle according to the first embodiment is rotated forward.
1B is a cross-sectional view taken along the line II of FIG. 1, and FIG. 1B is an equivalent view of FIG. 1A showing a case where the starting handle is reversed. FIG. 2A is a longitudinal sectional view showing a main part of the hand starting device, and FIG.
(B) is a principal part sectional view showing the locked concave portion of the starting handle.

In the manual starting device, the rotating cylinder (13) of the starting handle (1) is detachably mounted on the start shaft (2), and the start shaft (2) is manually operated by the starting handle (1). By rotating the engine forward, the engine is manually started. That is, as shown in FIG. 2A, the start shaft (2) is operatively connected to a crankshaft (5) disposed in an engine body (4) via a transmission gear (3). The start shaft (2) is projected from inside the engine body (4). Also, a handle locking pin is provided on the start shaft (2).
(7) is arranged. Then, as shown in FIG.
The starting handle (1) is engaged with the locking pin (7) of the starting handle (1) by engaging a locked concave portion (8) provided in the rotary cylinder (13) of the starting handle (1). Attached to. The start shaft (2) is surrounded by a tubular body (9) integrally formed with the engine body (4).

The starting handle (1) and the tubular body
(9) a rotation restricting means for allowing the crankshaft (5) to rotate forward while preventing the crankshaft (5) from rotating reversely;
(12) is provided. That is, the rotation restricting means (12) includes a swing shaft (14) arranged in parallel with the axis of the rotating cylinder (13) of the starting handle (1), and a swing shaft (14) for swinging. Lever (15) supported on the body and a locking rib provided on the cylindrical body (9)
[Locking portion] (16). The lever (1
5A, as shown in FIGS. 1A and 1B, is bent at an intermediate portion (17) to form a substantially L-shape, and the intermediate portion (17) is connected to the swing shaft ( 14). A long portion extending from the intermediate portion (17) of the lever (15) forms a contact portion (18), and a short portion forms a rotation preventing portion (19). The swing shaft (14) and the lever (15) are arranged in a cutout (21) formed by cutting out a part of the starting handle (1).

The rotation restricting means (12) operates as follows by the above configuration. That is, when the starting handle (1) is mounted on the start shaft (2) and rotated forward (clockwise in FIG. 1) for manual starting of the engine, the lever (15)
Contact portion (18) rises by centrifugal force [the state of the solid line in FIG. 1 (A)]. And the contact part (18) is the engine body (4).
When it comes into contact with the locking rib (16),
As a result, the contact portion (18) is pushed leftward in FIG. 1 (A). Then, the rotation preventing portion (19) of the lever (15) swings away from the lower surface (22) of the notch portion (21) of the starting handle (1), and a two-dot chain line diagram of FIG. As shown in the figure, while the contact portion (18) is tilted toward the start shaft (2), the lever (1)
5) passes under the locking rib (16). In other words, the starting handle (1) can continue to rotate forward without being disturbed by the locking rib (16), whereby the engine can be reliably started.

On the other hand, when the rotation force of the starting handle (1) is insufficient and the piston cannot exceed the compression top, the crankshaft (5) is reversed by the expansion force of the air compressed in the cylinder [FIG. 1, the starting handle (1) is reversed. And FIG.
As shown in (B), the contact portion (18) is
When it comes into contact with the locking rib (16) of (4), the locking rib
By (16), the contact portion (18) is pushed rightward in FIG. 1 (B). At that time, the detent part (19) of the lever (15) comes into contact with the lower surface (22) of the notch (21) of the starting handle (1), and the lever (15) cannot swing. The contact portion (18) is received by the locking rib (16). That is, the starting handle (1) is locked to the engine body (4) via the lever (15), and the reverse rotation of the starting handle (1) is prevented.

In the above description, the starting handle (1)
The lever (15) is provided on the start shaft (2).
May be provided. In this case, even if the starting handle (1) comes off the start shaft (2), the reverse rotation of the start shaft (2) is prevented. Also, as shown in FIG. 3 (A), by providing a spring [elastic means] (26) on the locking rib (16), the lever (15) can be rotated when the starting handle (1) is reversed. The contact portion (18) is connected to the locking rib via the spring (26).
(16) may be contacted. In this case, the impact caused by the contact between the lever (15) and the locking rib (16) during the reverse rotation of the starting handle (1) is reduced.

Further, as shown in FIG. 3B, the entire lever (15) may be constituted by a torsion coil spring [elastic means] made of an elastic piano wire or the like. This also allows the lever to be used when the starting handle (1) is reversed.
The impact caused by the contact between the (15) and the locking rib (16) can be reduced.
As shown in FIG. 3 (C), a torsion coil spring [elastic means] (27) is attached to the lever (15) in place of the rotation preventing portion (19) of the lever (15), whereby the starting handle
The impact caused by the contact between the lever (15) and the locking rib (16) during the reverse rotation of (1) may be reduced.

Next, a second embodiment of the hand starting device for an engine according to the present invention will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view showing a main part of the hand starting device according to the second embodiment. FIG. 5A shows a case where the starting handle according to the second embodiment is rotated forward.
5 (B) is a view corresponding to FIG. 5 (A) showing a case where the starting handle is reversed.

The lever (25) of the second embodiment has substantially the same configuration as the lever (15) of the first embodiment described above. ) Instead of weight (3
(0). That is, the weight (30) is heavier than the contact portion (18) of the lever (25).
For example, as shown in FIG. 2, the contact portion (18) is thicker than the contact portion (18). In addition, the weight part (30) is the contact part (18)
It may be made of a lead alloy having a larger specific gravity than that of the lead alloy.

The second embodiment operates as follows by the above configuration. That is, when the starting handle (1) is mounted on the start shaft (2) and rotated forward for manual starting of the engine, the weight (30) is centrifuged as shown in FIG. It rises in the centrifugal direction of the start shaft (2) by force, and its weight
The contact portion (18) of the lever (25) falls due to the rising of (30). Thus, the starting handle (1) rotates without the weight portion (30) and the contact portion (18) coming into contact with the locking rib (16) of the engine body (4).

On the other hand, when the rotational force of the starting handle (1) is insufficient and the piston cannot exceed the compression top, the starting handle (1) reverses from normal rotation to reverse rotation.
At this time, the weight portion (30) moves in the normal rotation direction (rightward in FIG. 5B) due to inertia force, and as shown in FIG. ) Notch (21) underside (22)
And fall down so that it comes into contact with
8) stands up. Then, the contact portion (18) is engaged with the locking rib (1
6), the contact portion (18) is pushed rightward in FIG. 5 (B) by the locking rib (16), but the weight portion (30) is pushed by the starting handle ( The lever (25) cannot swing due to contact with the lower surface (22) of the notch (21) of (1).

For this reason, the contact portion (18) is
(16), the starting handle (1) is moved to the lever (25)
To prevent the starting handle (1) from rotating in the reverse direction. Thus, when the starting handle (1) is rotating forward, the lever
Since the contact portion (18) of (25) does not contact the locking rib (16), the contact portion (18) or the locking rib () due to the contact between the contact portion (18) and the locking rib (16). In addition to preventing the wear of 16), the noise caused by the contact can be prevented.

Next, a third embodiment of the hand starting device for an engine according to the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a longitudinal sectional view showing a main part of the hand starting device according to the third embodiment. FIG. 7A shows a case where the starting handle according to the third embodiment is rotated forward.
7B is a sectional view taken along line VII-VII of FIG. 7, and FIG. 7B is an equivalent view of FIG. 7A showing a case where the starting handle is reversed.

The third embodiment has substantially the same configuration as the above-described second embodiment.
5) is provided on the start shaft (2), and a locking rib [locking portion] (3) is attached to the engine body (4) in accordance with the position of the lever (25).
1). Also in the third embodiment, similarly to the above-described second embodiment, when the starting handle (1) is rotating forward, as shown in FIG. 30) rises in the centrifugal direction of the start shaft (2) due to centrifugal force, and the contact portion (18) of the lever (25) falls down, so that the contact portion (18) comes into contact with the locking rib (31). do not do.

In the third embodiment, similarly to the above-described second embodiment, when the starting handle (1) reverses from normal rotation to reverse rotation, as shown in FIG. The weight portion (30) falls down due to inertial force, and accordingly, the contact portion (18) rises. When the contact portion (18) comes into contact with the locking rib (31) and is received, the start shaft (2) is locked to the engine body (4) via the lever (25), The reverse rotation of the start shaft (2) is prevented. On the other hand, in the third embodiment, since the start shaft (2) is provided with the lever (25), even if the starting handle (1) comes off from the start shaft (2), the start shaft (2) will not move. Reversal can be reliably prevented.

In the third embodiment, as shown in FIG. 8, the damper [elastic means] (32) is connected to the locking rib (31).
The contact portion (18) of the lever (25) comes into contact with the locking rib (31) via the damper (32) when the start shaft (2) rotates in the reverse direction. The impact at the time of contact between the contact portion (18) and the locking rib (31) may be reduced. Further, the damper (32) may be provided on the locking ribs (16) and (31) according to the first and second embodiments. Also, the spring or damper (32) is provided on the contact portion (18) of the lever (15) / (25), or on both the locking ribs (16) / (31) and the contact portion (18). May be provided to reduce the impact at the time of contact between the contact portion (18) and the locking ribs (16) and (31).

Further, in the description of each of the above embodiments, the lever
(15) and (25) are the start handle (1) or start shaft
Although provided in (2), the present invention is not limited to this. For example, a lever may be provided on the crankshaft (5).
Or you may provide in the said transmission gear (3). In addition, the above-mentioned lever is operated by a valve operating camshaft driven by a crankshaft (5),
It may be provided on a drive gear of the valve cam shaft, a balance shaft driven by a crankshaft (5), or the like. In these cases, a locking rib is arranged on the engine body (4) in accordance with the arrangement of the lever.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of an engine hand starting device according to the present invention, and FIG. 1 (A) shows a case where the starting handle according to the first embodiment is rotated forward. FIG. 2A is a sectional view taken along line II of FIG. 2A, and FIG. 1B is a view corresponding to FIG. 1A showing a case where the starting handle is reversed.

FIG. 2A is a longitudinal sectional view showing a main part of the hand starting device, and FIG. 2B is a main part sectional view showing a locked concave portion of the starting handle.

FIGS. 3 (A) to 3 (C) are cross-sectional views of main parts showing respective examples of elastic means for reducing an impact caused by abutment of a lever and a locking rib when the starting handle is reversed. is there.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the hand starting device for an engine according to the present invention, and showing a main part of the hand starting device.

5 (A) is a cross-sectional view taken along line VV of FIG. 4 showing a case where the starting handle according to the second embodiment is rotated forward, and FIG. FIG. 5 (A) is a view showing a case where the handle is reversed.

FIG. 6 shows a third embodiment of the hand starting device for an engine according to the present invention, and is a longitudinal sectional view showing a main part of the hand starting device.

7A is a cross-sectional view taken along line VII-VII of FIG. 6 when the starting handle according to the third embodiment is rotated forward, and FIG. FIG. 8A is a view corresponding to FIG. 7A showing a case in which the handle is reversed.

FIG. 8 is a cross-sectional view of a main part showing another example of the elastic means for reducing the impact caused by the contact between the lever and the locking rib when the starting handle is reversed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Start handle, 2 ... Start shaft, 5 ... Crank shaft, 4 ... Engine body, 12 ... Rotation restricting means, 14 ... Swinging shaft, 15/25 ... Lever, 16/31 ... Locking rib [Locking portion ], 17…
The middle part of the lever, 18 ... the contact part of the lever, 19 ... the detent part of the lever, 30 ... the weight part of the lever.

Claims (5)

[Claims] 1. A start handle (1) is mounted on a start shaft (2) interlockingly connected to a crankshaft (5) of an engine, and the start shaft (2) is manually rotated by the start handle (1). In the engine manual starting device configured to perform manual starting of the engine, a rotation restricting means for permitting normal rotation of the crankshaft (5) while prohibiting reverse rotation of the crankshaft (5). A manual starting device for an engine, provided with (12). 2. The hand starting device for an engine according to claim 1, wherein the rotation restricting means (12) is a swing shaft (14) disposed on the starting handle (1) or the start shaft (2). And a lever (15) swingably supported by the swing shaft (14).
And an engaging portion (16) provided on the engine body (4). The lever (15) is provided with a contact portion (18) with an intermediate portion (17) interposed therebetween.
The contact portion (18) rises in the centrifugal direction of the start shaft (2) due to centrifugal force generated by rotation of the starting handle (1), and stops the lock. The rotation preventing portion (19) is configured to be able to abut on the start handle (1) or the start shaft only when the start shaft (2) rotates in the reverse direction.
(2) The manual starting device for an engine, wherein the device is configured to abut on (2) to prevent the swing of the lever (15). 3. The hand starting device for an engine according to claim 2, wherein the lever (15) has the detent part (19) configured by a weight part (30), and the weight part (30) is When the start handle (1) rotates forward in the normal direction of the start shaft (2) by centrifugal force when the start handle (1) rotates forward, the contact portion (18) is tilted toward the start shaft (2),
While the contact portion (18) and the locking portion (16) are prevented from contacting each other, when the starting handle (1) changes from the normal rotation state to the reverse rotation state, the start operation is performed by inertia force. axis
(2) The manual starting device for an engine, characterized in that the contact portion (18) falls down to the side and rises in the centrifugal direction of the start shaft (2). 4. The manual starting device for an engine according to claim 1, wherein the rotation regulating means (12) is provided on the crankshaft (5) or a rotating member driven by the crankshaft (5). A manual starting device for an engine. 5. The hand starting device for an engine according to claim 1, wherein at least one of the locking portion (16) and the lever (15) is provided with elastic means, and the starting handle ( When the contact portion (18) comes into contact with the locking portion (16) due to the reverse rotation of 1), the contact portion (18) and the locking portion (16) are elastically deformed by the elastic means. ), Which is configured to reduce an impact force caused by contact with the engine.