JP2021017091A - Fall arrester - Google Patents

Abstract

To restrain unnecessary damage to a lower part of a vehicle body on which a fall arrester is installed even when a propeller shaft moves backward relative to the vehicle body.SOLUTION: A fall arrester 13 is for preventing falling of a propeller shaft 11 extending in a longitudinal direction of a vehicle body 101 and having a front end thereof connected to an output shaft of a transmission and a rear end thereof connected to an input shaft of a differential mechanism. The fall arrester 13 has a falling support part 131 straddling under the propeller shaft 11 and capable of supporting the propeller shaft 11 displaced downward, a first installation part 132 provided on one end of the falling support part 131, and a second installation part 133 provided on the other end of the falling support part 131. The first installation part 132 is fixedly installed to a lower part of a vehicle body 101, and the second installation part 133 is installed in a state of being inserted in an insertion target part 108 provided in a lower part of the vehicle body 101.SELECTED DRAWING: Figure 4

Description

The present invention relates to a fall prevention device that prevents a vehicle propeller shaft or the like from falling.

As a technique of this kind, for example, the fall prevention device described in Patent Document 1 below is known. The fall prevention device described in Patent Document 1 prevents the propeller shaft from falling by fixing one end to the lower part of the vehicle body and fixing the other end to an adjacent exhaust pipe straddling the lower part of the propeller shaft.

Japanese Unexamined Patent Publication No. 2004-42774

However, if both ends of the fall prevention device are fixed and attached to the lower part of the vehicle body, for example, if the vehicle collides with an obstacle or the like and the propeller shaft moves rearward relative to the vehicle body, the fall prevention device is attached. There is a risk of unnecessary damage to parts, etc.

The fall prevention device according to one aspect of the present invention prevents the propeller shaft extending in the front-rear direction of the vehicle body from falling, with the front end connected to the output shaft of the drive source and the rear end connected to the input shaft of the differential mechanism. It is a device. The fall prevention device is provided at a drop support portion that straddles the lower part of the propeller shaft and can support the propeller shaft displaced downward, a first attachment portion provided at one end of the drop support portion, and the other end of the drop support portion. It is provided with a second mounting portion. The first mounting portion is fixedly mounted on the lower part of the vehicle body, and the second mounting portion is mounted in a state of being inserted into the insertion portion provided in the lower part of the vehicle body.

According to the present invention, even when the propeller shaft moves rearward relative to the vehicle body, it is possible to prevent unnecessary damage to the lower portion of the vehicle body to which the fall prevention device is attached.

The side view which shows the schematic structure of the power transmission device of the vehicle which used the fall prevention device which concerns on embodiment of this invention. The perspective view which shows the schematic structure of the fall prevention device which concerns on this embodiment. FIG. 2 is a side view of the fall prevention device shown in FIG. A side view showing a state in which the fall prevention device shown in FIG. 2 is attached to the lower part of the vehicle body. A side view schematically showing a state in which the propeller shaft of the power transmission device is moved rearward relative to the vehicle body. The perspective view which shows the schematic structure of the other form of the fall prevention device which concerns on this embodiment. A front view showing a state in which another form of fall prevention device shown in FIG. 6 is attached to the lower part of the vehicle body. FIG. 7A is a partially enlarged view showing a second mounting portion of the fall prevention device of FIG. 7A.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7B. The fall prevention device according to the embodiment of the present invention is applied to, for example, a power transmission device that transmits the driving force of a drive source mounted on a vehicle to drive wheels via a differential mechanism.

FIG. 1 is a side view showing a schematic configuration of a vehicle power transmission device 10 using the fall prevention device 13 according to the embodiment of the present invention, and FIG. 2 is a schematic configuration of the fall prevention device 13 according to the present embodiment. It is a perspective view which shows. FIG. 3 is a side view of the fall prevention device 13 shown in FIG. 2, and FIG. 4 is a side view showing a state in which the fall prevention device 13 shown in FIG. 2 is attached to the lower portion of the vehicle body 101. In the following, for convenience, the front-back direction, the left-right direction, and the up-down direction are defined as shown in the figure, and the configuration of each part will be described according to these definitions.

As shown in FIG. 1, the power transmission device 10 is displaced downward with a propeller shaft 11 extending in the front-rear direction below the vehicle body 101, a rotation support portion 12 for rotatably supporting the propeller shaft 11 with respect to the vehicle body 101, and the like. A fall prevention device 13 for supporting the propeller shaft 11 so as not to fall from the vehicle body 101 is provided.

The front end of the propeller shaft 11 is connected to a drive source 102 supported by the vehicle body 101 via a hook type joint 111. The drive source 102 includes an engine 103 and a transmission 104, and the front end of the propeller shaft 11 is connected to an output shaft 105 of the transmission 104. The rear end of the propeller shaft 11 is connected to the input shaft 107 of the differential mechanism 106 supported by the vehicle body 101 via a hook type joint 112.

In the present embodiment, the propeller shaft 11 includes a front propeller shaft 11a arranged on the front side of the vehicle 100 (not shown) and a rear propeller shaft 11b arranged on the rear side. The front propeller shaft 11a and the rear propeller shaft 11b are connected by a constant velocity joint 113. That is, the front propeller shaft 11a has the hook type joint 111 provided at the front end portion and the cup portion of the constant velocity joint 113 provided at the rear end portion, and the rear propeller shaft 11b is provided at the front end portion. It has a spider portion housed in a cup portion of a constant velocity joint 113 and a hook type joint 112 provided at a rear end portion.

The rotation support portion 12 is provided at a substantially central portion of the propeller shaft 11 in the front-rear direction, for example, at the front end portion of the rear propeller shaft 11b. The rotary support portion 12 includes a center bearing support 121 that rotatably supports the front end portion of the rear propeller shaft 11b, a bracket 122 that fixes the center bearing support 121 to the lower part of the vehicle body 101, and a center bearing support 121 and the bracket 122. It has an elastic portion 123 interposed between them. The propeller shaft 11 is rotatably supported by the vehicle body 101 by fixing the center bearing support 121 to the lower portion of the vehicle body 101 via the bracket 122.

The elastic portion 123 is formed in an annular shape by an elastic body such as rubber, and is formed so as to be able to cover the outer peripheral surface of the center bearing support 121 formed in a substantially cylindrical shape. The elastic portion 123 is configured so that when the propeller shaft 11 tries to move rearward, it breaks and an unnecessary load is not generated on the center bearing support 121 and the bracket 122.

The fall prevention device 13 is provided at a substantially central portion of the front propeller shaft 11a in the front-rear direction and a substantially central portion of the rear propeller shaft 11b in the front-rear direction. Since the fall prevention device 13 provided on the front propeller shaft 11a and the fall prevention device 13 provided on the rear propeller shaft 11b have the same configuration, the fall prevention device 13 provided on the rear propeller shaft 11b will be described below. Will be described using.

As shown in FIG. 2, the fall prevention device 13 includes a drop support portion 131 formed so as to straddle the lower side of the rear propeller shaft 11b in the left-right direction, and a first attachment portion 132 provided at one end of the drop support portion 131. And a second mounting portion 133 provided at the other end of the drop support portion 131. The fall prevention device 13 is formed by, for example, bending a metal strip-shaped member.

The drop support portion 131 is formed in a substantially U shape with the upper side open when viewed from the front. Specifically, the drop support portion 131 has a pair of side plate portions 131a and 131a extending in the vertical direction and a bottom plate portion 131b connecting the lower ends of the pair of side plate portions 131a and 131a. The vertical length of the pair of side plate portions 131a and 131a and the horizontal length of the bottom plate portion 131b both have a length equal to or larger than the diameter of the rear propeller shaft 11b, and are included in the drop support portion 131. The rear propeller shaft 11b is formed so as to be dispositionable with a predetermined clearance.

In the present embodiment, the drop support portion 131 having a substantially U-shape in front view with an upper opening is used, but the drop support portion has a shape in which the rear propeller shaft 11b can be arranged inward. Often, for example, it may be formed in a substantially U-shape in front view with an opening at the top. For example, by making the drop support portion substantially U-shaped, the contact area with the rear propeller shaft 11b that is displaced downward is increased, and the deformation of the rear propeller shaft 11b that is displaced downward can be suppressed.

The first mounting portion 132 is provided at the upper end of one side of the drop support portion 131, and as shown in FIG. 3, extends rearward from the upper end of the drop support portion 131. The first mounting portion 132 is formed, for example, by bending the upper end of one side of the drop support portion 131 rearward.

As shown in FIG. 4, the first mounting portion 132 is formed so as to be substantially parallel to the lower portion of the vehicle body 101. The first mounting portion 132 is formed with an insertion hole 132h through which a fixing bolt 14 for fixing to the lower portion of the vehicle body 101 can be inserted at a substantially central portion in the front-rear direction. An insertion hole 101h through which the fixing bolt 14 can be inserted is also formed in the lower part of the vehicle body 101, and by fixing the fixing bolt 14 through which the insertion holes 132h and 101h are inserted with the nut 15, the first mounting portion 132 can be formed. It is fixed to the lower part of the vehicle body 101.

The second mounting portion 133 is provided at the upper end of the other side of the drop support portion 131, and as shown in FIG. 3, extends forward from the upper end of the drop support portion 131. The second mounting portion 133 has a substantially rectangular shape that is long in the front-rear direction, and is formed by, for example, bending the upper end of the other side of the drop support portion 131 forward.

As shown in FIG. 4, the second mounting portion 133 is formed so as to be substantially parallel to the lower portion of the vehicle body 101. At the lower part of the vehicle body 101, an insertion portion 108 formed so that the second attachment portion 133 can be inserted in the front-rear direction is formed, and by inserting the second attachment portion 133 into the insertion portion 108, the second attachment portion 108 is formed. 2 The mounting portion 133 is mounted on the lower part of the vehicle body 101.

The insertion portion 108 has a front wall portion 108a extending downward from the lower part of the vehicle body 101, and a bottom wall portion 108b extending rearward from the lower end of the front wall portion 108a. The bottom wall portion 108b extends substantially parallel to the lower portion of the vehicle body 101. The vertical length of the front wall portion 108a is longer than the thickness of the second mounting portion 133, and the length of the bottom wall portion 108b in the front-rear direction is longer than the length of the second mounting portion 133 in the front-rear direction. The second mounting portion 133 can be inserted between the lower portion of the vehicle body 101 and the bottom wall portion 108b. The second mounting portion 133 is inserted between the lower portion of the vehicle body 101 and the bottom wall portion 108b via a predetermined gap in the vertical direction.

Further, the length of the bottom wall portion 108b in the left-right direction is longer than the length of the second mounting portion 133 in the left-right direction, and the second mounting portion 133 is difficult to be removed from the insertion portion 108 in the left-right direction. The insertion portion 108 may have a structure having a pair of side wall portions standing upward from both ends in the left-right direction of the bottom wall portion 108b. Since the insertion portion 108 has a pair of side wall portions, the rigidity of the insertion portion 108 is increased.

Next, the operation of the fall prevention device 13 when the propeller shaft 11 of the power transmission device 10 configured as described above moves rearward relative to the vehicle body 101 will be described with reference to FIG. FIG. 5 is a side view schematically showing a state in which the propeller shaft 11 of the power transmission device 10 is moved rearward relative to the vehicle body 101.

For example, when the vehicle 100 collides front with an obstacle or another vehicle and the drive source 102 such as the engine 103 and the transmission 104 moves rearward with respect to the vehicle body 101, the propeller shaft 11 connected to the drive source 102 also moves. Moves relative to the rear.

When the propeller shaft 11 moves relative to the rear, for example, a load from the propeller shaft 11 acts on a support member (not shown) that supports the front portion of the differential mechanism 106 made of a relatively heavy object, and this support member is damaged. To do. When the support member is damaged, as shown in FIG. 5, the front portion of the differential mechanism 106 falls from the lower part of the vehicle body 101, and the rear end portion of the rear propeller shaft 11b is connected to the input shaft 107 of the differential mechanism 106. The part bends with the hook type joint 112 as a bending point.

In the rotary support portion 12 that supports the substantially central portion of the propeller shaft 11, the elastic portion 123 formed by an elastic body such as rubber is broken by the relative movement of the propeller shaft 11, but the bracket 122 supports the propeller shaft 11. It remains in the lower part of the vehicle body 101 in this state.

When the connecting portion between the rear end portion of the rear propeller shaft 11b and the input shaft 107 of the differential mechanism 106 is bent, the rear propeller shaft 11b moves rearward while being displaced downward. When the rear propeller shaft 11b is displaced downward, the rear propeller shaft 11b comes into contact with the fall support portion 131 of the fall prevention device 13 and is supported by the fall prevention device 13. When the rear propeller shaft 11b moves further rearward while being supported by the fall prevention device 13, a rearward load acts on the fall prevention device 13.

When a rearward load acts on the fall prevention device 13, the second attachment portion 133 attached while being inserted into the insertion portion 108 of the vehicle body 101 slides backward and falls out of the insertion portion 108. On the other hand, since the first mounting portion 132 is fixed to the lower part of the vehicle body 101 with the fixing bolt 14, it does not come off from the lower part of the vehicle body 101.

When the second attachment portion 133 comes off from the insertion portion 108, for example, it is possible to prevent the insertion portion 108 from being damaged by an unnecessary stress acting on the insertion portion 108. Further, for example, when the second mounting portion 133 becomes a free end, the rearward force acting on the first mounting portion 132 is also reduced, and the first mounting portion 132 is also less likely to be damaged. Further, for example, by maintaining the state in which the first mounting portion 132 is fixed to the lower part of the vehicle body 101, the drop support portion 131 suppresses the rear propeller shaft 11b from falling, and the rear propeller shaft 11b is also damaged. It will be reduced.

Similarly, when the propeller shaft 11 moves relative to the rear, as shown in FIG. 5, the connecting portion between the output shaft 105 of the transmission 104 and the front end portion of the front propeller shaft 11a bends with the hook type joint 111 as a bending point.

When the connecting portion between the output shaft 105 of the transmission 104 and the front end portion of the front propeller shaft 11a is bent, the front propeller shaft 11a moves rearward while being displaced downward. When the front propeller shaft 11a is displaced downward, the front propeller shaft 11a comes into contact with the fall support portion 131 of the fall prevention device 13 and is supported by the fall prevention device 13. When the front propeller shaft 11a moves further rearward while being supported by the fall prevention device 13, a rearward load acts on the fall prevention device 13.

When a rearward load acts on the fall prevention device 13, the second mounting portion 133, which is mounted while being inserted into the plugged-in portion 108 of the vehicle body 101, slides backward and is plugged in, as described above. It falls out of part 108. On the other hand, since the first mounting portion 132 is fixed to the lower part of the vehicle body 101 with the fixing bolt 14, it does not come off from the lower part of the vehicle body 101.

By pulling out the second mounting portion 133 from the plug-in portion 108, it is possible to prevent the plug-in portion 108 from being damaged due to unnecessary stress acting on the plug-in portion 108, for example, on the front propeller shaft 11a side as well. Will be done. Further, for example, when the second mounting portion 133 becomes a free end, the rearward force acting on the first mounting portion 132 is also reduced, and the first mounting portion 132 is also less likely to be damaged. Further, for example, by maintaining the state in which the first mounting portion 132 is fixed to the lower part of the vehicle body 101, the drop support portion 131 suppresses the front propeller shaft 11a from falling, and the damage to the front propeller shaft 11a is also reduced. To.

Next, another form of the fall prevention device 13 described above will be described with reference to FIGS. 6 to 7B. FIG. 6 is a perspective view showing a schematic configuration of another embodiment of the fall prevention device according to the present embodiment. FIG. 7A is a front view showing a state in which the fall prevention device 13A of another form shown in FIG. 6 is attached to the lower portion of the vehicle body 101, and FIG. 7B shows the second attachment portion 133A of the fall prevention device 13A of FIG. 7A. It is a partially enlarged view which shows.

As shown in FIG. 6, the fall prevention device 13A differs from the fall prevention device 13 in the configurations of the first mounting portion and the second mounting portion. Therefore, here, the differences from the fall prevention device 13, that is, the first mounting portion 132A and the second mounting portion 133A of the fall prevention device 13A will be mainly described, and the same configuration as the fall prevention device 13 will be described as fall prevention. The same reference numerals as those of the apparatus 13 are assigned, and the description thereof will be omitted. Further, with respect to other members, the same reference numerals are given to the same configurations, and the description thereof will be omitted.

As shown in FIG. 6, the fall prevention device 13A includes a drop support portion 131 formed so as to straddle the lower side of the rear propeller shaft 11b in the left-right direction, and a first attachment portion 132A provided at one end of the drop support portion 131. And a second mounting portion 133A provided at the other end of the drop support portion 131. The fall prevention device 13A is formed by, for example, bending a metal strip-shaped member.

The first mounting portion 132A is provided at the upper end of one side of the drop support portion 131, and as shown in FIG. 6, extends from the upper end of the drop support portion 131 toward the left. The first mounting portion 132A is formed, for example, by bending the upper end of one side of the drop support portion 131 to the left side.

As shown in FIG. 7A, the first mounting portion 132A is formed so as to be substantially parallel to the lower portion of the vehicle body 101. The first mounting portion 132A is formed with an insertion hole 132h through which a pin member 16 for fixing to the lower portion of the vehicle body 101 can be inserted at a substantially central portion in the left-right direction. An insertion hole 101h through which the pin member 16 can be inserted is also formed in the lower part of the vehicle body 101, and the first mounting portion 132 is fixed to the lower part of the vehicle body 101 by the pin member 16 through which the insertion holes 132h and 101h are inserted. To.

A pin member 16 that breaks when an impact load of a predetermined value or more is applied in a direction intersecting the axial direction is used. By using such a pin member 16, when an impact load of a predetermined value or more is applied to the fall prevention device 13A, the pin member 16 is broken, so that the portion of the vehicle body 101 to which the first attachment portion 132A is attached is less likely to be damaged. ..

Further, for example, when an impact load of a predetermined value or less is applied to the fall prevention device 13A, the second mounting portion 133A is removed from the insertion portion 108, and when an impact load of a predetermined value or more is applied, a pin member 16 for fixing the first mounting portion 132A is provided. It may be configured to break. With this configuration, the first mounting portion 132A and the second mounting portion 133A are gradually disengaged, and for example, damage to the propeller shaft 11, the lower portion of the vehicle body 101, and the fall prevention device 13A is efficiently prevented. be able to.

When the first mounting portion 132A is fixed by the pin member 16, a guide for guiding the first mounting portion 132A rearward when the pin member 16 breaks is provided at the lower part of the vehicle body 101 to which the first mounting portion 132A is fixed. A part may be provided. By providing the guide portion at the lower part of the vehicle body 101, for example, when the pin member 16 breaks, the first mounting portion 132A is guided rearward, so that damage to the propeller shaft 11 can be suppressed, for example.

The second mounting portion 133A is provided at the upper end of the other side of the drop support portion 131, and as shown in FIG. 6, extends from the upper end of the drop support portion 131 toward the right. The second mounting portion 133A has a substantially rectangular shape that is long in the left-right direction, and is formed by, for example, bending the upper end of the other side of the drop support portion 131 to the right side.

As shown in FIG. 7A, the second mounting portion 133A is formed so as to be substantially parallel to the lower portion of the vehicle body 101. At the lower part of the vehicle body 101, an insertion portion 108A formed so that the second attachment portion 133A can be inserted in the front-rear direction is formed, and by inserting the second attachment portion 133A into the insertion portion 108A, the second attachment portion 108A is formed. 2 The mounting portion 133A is mounted on the lower part of the vehicle body.

As shown in FIG. 7B, a guide convex portion (guide portion) 134 that can be engaged with the guide concave portion (guide portion) 108e described later formed in the insertion portion 108A is formed on the lower surface of the second mounting portion 133A. Has been done. The guide convex portion 134 is formed on the lower surface of the second mounting portion 133A so as to extend in the front-rear direction.

The insertion portion 108A has a side wall portion 108c extending downward from the lower part of the vehicle body 101, and a bottom wall portion 108d extending to the left from the lower end of the side wall portion 108c. The bottom wall portion 108d extends substantially parallel to the lower portion of the vehicle body 101. The vertical length of the side wall portion 108c is longer than the thickness of the second mounting portion 133A, and the horizontal length of the bottom wall portion 108d is formed longer than the horizontal length of the second mounting portion 133A. A second mounting portion 133A can be inserted between the lower portion of the vehicle body 101 and the bottom wall portion 108d. The second mounting portion 133A is in a state of being inserted between the lower portion of the vehicle body 101 and the bottom wall portion 108d through a predetermined gap in the vertical direction.

Further, the length of the bottom wall portion 108d in the front-rear direction is longer than the length of the second mounting portion 133A in the front-rear direction, and when the second mounting portion 133A moves rearward, it comes off from the insertion portion 108A. There is.

The above-mentioned guide recess 108e is formed on the upper surface of the bottom wall portion 108d. The guide recess 108e is formed so as to extend in the front-rear direction on the upper surface of the bottom wall portion 108d so that the second mounting portion 133A can be guided rearward. By providing the guide convex portion 134 on the second mounting portion 133A and providing the guide concave portion 108e on the bottom wall portion 108d, the second mounting portion 133A can be easily moved rearward.

By configuring the fall prevention device 13A as described above, for example, when the vehicle collides with an obstacle or another vehicle in front and the propeller shaft 11 moves rearward relative to the vehicle body 101 together with the drive source 102. , The second mounting portion 133A can easily move backward. That is, the second mounting portion 133A is likely to come off from the insertion portion 108A. Further, when an impact load of a predetermined value or more is applied to the fall prevention device 13A, the first mounting portion 132A also comes off from the lower part of the vehicle body 101. Therefore, for example, it is possible to prevent the lower portion of the vehicle body 101 to which the fall prevention device 13 is attached from being unnecessarily damaged.

According to this embodiment, the following effects can be obtained.
(1) A fall prevention device that prevents the propeller shaft 11 extending in the front-rear direction of the vehicle body 101 from falling, with the front end connected to the output shaft 105 of the transmission 104 and the rear end connected to the input shaft 107 of the differential mechanism 106. It is 13. The fall prevention device 13 has a drop support portion 131 that straddles the lower part of the propeller shaft 11 and can support the propeller shaft 11 displaced downward, a first mounting portion 132 provided at one end of the drop support portion 131, and a drop support portion. A second mounting portion 133 provided at the other end of the 131 is provided. The first mounting portion 132 is fixedly mounted on the lower portion of the vehicle body 101. The second attachment portion 133 is attached in a state of being inserted into the insertion portion 108 provided at the lower part of the vehicle body 101.

With this configuration, for example, even when the vehicle collides with an obstacle or another vehicle in front and the propeller shaft 11 moves rearward relative to the vehicle body 101 together with the drive source 102, the fall prevention device 13 is attached. It is possible to prevent the lower portion of the vehicle body 101 and the propeller shaft 11 from being unnecessarily damaged.

(2) The second mounting portion 133 and the insertion portion 108 are formed so that the second mounting portion 133 can be inserted into the insertion portion 108 in the front-rear direction. As a result, for example, when the vehicle collides with an obstacle or another vehicle in the front, the second mounting portion 133 can easily come off from the insertion portion 108. Therefore, it is possible to prevent the lower portion of the vehicle body 101 to which the fall prevention device 13 is attached and the propeller shaft 11 from being unnecessarily damaged.

(3) The first mounting portion 132 extends to one side in the front-rear direction, and the second mounting portion 133 extends to the other side in the front-rear direction. In this way, the first mounting portion 132 and the second mounting portion 133 extend in different directions from each other. As a result, for example, when the vehicle collides with an obstacle or another vehicle in the front, the first mounting portion 132 is hard to come off and the second mounting portion 133 can be easily come off.

(4) The second mounting portion 133 and the inserted portion 108 have a guide recess 108e and a guide convex portion 134 that guide the second mounting portion 133 in the front-rear direction with respect to the inserted portion 108. Thereby, for example, when the vehicle collides with an obstacle or another vehicle in the front direction, the second mounting portion 133 can be easily pulled out from the insertion portion 108.
(5) The first mounting portion 132A is fixedly mounted on the lower portion of the vehicle body 101 by a pin member 16 that breaks due to an impact load of a predetermined value or more to the rear. As a result, for example, when the vehicle collides with an obstacle or another vehicle in front, the fall prevention device 13A can be removed from the lower part of the vehicle body 101, and the lower part of the vehicle body 101 and the propeller shaft 11 are unnecessarily damaged. Can be prevented.

In the above embodiment, the fall prevention device 13 having the first mounting portion 132 extending rearward and the second mounting portion 133 extending forward has been described, but the present invention is not limited thereto. The fall prevention device may have, for example, a configuration having a first mounting portion extending forward and a second mounting portion extending rearward. Further, for example, the configuration may include a first mounting portion and a second mounting portion extending forward, or a first mounting portion and a second mounting portion extending rearward.

In the above embodiment, the guide convex portion 134 is provided in the second mounting portion 133, and the guide concave portion 108e is provided in the insertion portion 108, but the present invention is not limited thereto. For example, the second mounting portion 133 or the insertion portion 108 may be provided with a guide portion for guiding the rear portion.

In the above embodiment, the propeller shaft 11 having a front side propeller shaft 11a and a rear side propeller shaft 11b is used, but the present invention is not limited thereto. For example, it may be an integrally configured propeller shaft that is not divided.

In the above embodiment, the fall prevention device 13 having the same configuration is attached to the front propeller shaft 11a and the rear propeller shaft 11b by the same attachment method, but the present invention is not limited thereto. For example, the fall prevention device 13 is attached to the front propeller shaft 11a so that the second mounting portion 133 extends rearward, and the second mounting portion 133 falls to the rear propeller shaft 11b so as to extend rearward. The prevention device 13 may be attached.

By attaching the fall prevention device 13 to the lower part of the vehicle body 101 so that the second attachment portion 133 extends rearward with respect to the front propeller shaft 11a, for example, the output shaft 105 of the transmission 104 and the front end portion of the front propeller shaft 11a When the connecting portion of the above is bent with the hook type joint 111 as a bending point, the second mounting portion 133 is likely to come off.

Similarly, by mounting the fall prevention device 13 on the lower part of the vehicle body 101 so that the second mounting portion 133 extends forward with respect to the rear propeller shaft 11b, for example, it is differential from the rear end portion of the rear propeller shaft 11b. When the connecting portion of the mechanism 106 with the input shaft 107 is bent with the hook type joint 112 as a bending point, the second mounting portion 133 is likely to come off.

The above description is merely an example, and the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.

10 Power transmission device, 11 Propeller shaft, 13 Fall prevention device, 101 Body, 102 Drive source, 103 Engine, 104 Transmission, 106 Differential mechanism, 108 Insertion part, 131 Drop support part, 132 First mounting part, 133 Second mounting part

Claims (5)

A fall prevention device that prevents the propeller shaft from falling, extending in the front-rear direction of the vehicle body, the front end being connected to the output shaft of the drive source, and the rear end being connected to the input shaft of the differential mechanism.
A drop support portion that straddles the lower part of the propeller shaft and can support the downwardly displaced propeller shaft, a first attachment portion provided at one end of the drop support portion, and a first attachment portion provided at the other end of the drop support portion. Equipped with 2 mounting parts
The first mounting portion is fixedly mounted on the lower portion of the vehicle body, and the second mounting portion is mounted in a state of being inserted into an insertion portion provided in the lower portion of the vehicle body. Fall prevention device. In the fall prevention device according to claim 1,
The fall prevention device is characterized in that the second mounting portion and the plugged portion are formed so that the second mounting portion can be inserted into the plugged portion in the front-rear direction. In the fall prevention device according to claim 1 or 2.
A fall prevention device characterized in that the first mounting portion extends to one side in the front-rear direction, and the second mounting portion extends to the other side in the front-rear direction. In the fall prevention device according to any one of claims 1 to 3,
A fall prevention device, characterized in that one or both of the second mounting portion and the plugged portion has a guide portion for guiding the second mounting portion in the front-rear direction with respect to the plugged portion. In the fall prevention device according to any one of claims 1 to 4.
The first mounting portion is a fall prevention device characterized in that the first mounting portion is fixedly mounted on the lower portion of the vehicle body by a pin member that breaks due to an impact load of a predetermined value or more to the rear.

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