JP6025612B2 - Vehicle power transmission device - Google Patents

Description

  The present invention relates to a vehicle power transmission device, and more particularly to a power transmission device capable of improving fuel efficiency in a vehicle including a one-way clutch.

  Some conventional vehicle power transmission devices include a one-way clutch. In this one-way clutch, for example, as described in Patent Document 1, as a means for preventing unnecessary friction from occurring when the outer member and the inner member of the one-way clutch are not engaged, There is known one in which a bearing or a roller is provided between a member and an antenna member.

JP 2011-163528 A

  As described in Patent Document 1, generation of useless friction can be suppressed by a bearing or roller, but in reality, a slight amount of friction is also generated by a bearing or roller. As a result, there is a demand for a vehicle power transmission device including a clutch mechanism that can greatly reduce fuel consumption performance and reduce friction loss as much as possible even in the case of this slight friction loss, particularly in small and light vehicles. Yes.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve the fuel efficiency by reducing the friction loss of the one-way clutch more than before in the power transmission device of the vehicle including the one-way clutch. An object of the present invention is to provide a power transmission device for a vehicle.

  In order to achieve the above object, an invention according to claim 1 is directed to a power transmission member that transmits a driving force of an internal combustion engine to a driven flange that is rotatably provided on an axle of a driving wheel, and a driving force of the driven flange. A vehicle power transmission device comprising: a one-way clutch that transmits to the drive wheel, wherein the one-way clutch is provided on the driven flange side, and the drive engagement side is provided on the drive wheel side. A passive engagement portion that engages with a portion, and the driven flange slides in an axial direction of the axle so that the drive engagement portion and the passive engagement portion can be separated from each other.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the slide drive unit that slide-drives the driven flange extends into the axle along the axis of the axle and extends from the inside of the axle. A slide shaft member connected to the driven flange, and a drive main body that drives the slide shaft member.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the drive main body includes an air cylinder main body containing a piston that moves by air inflow, and the piston engages the drive by air inflow. Is moved in the engagement direction between the drive engagement portion and the passive engagement portion, and is moved in the engagement release direction between the drive engagement portion and the passive engagement portion by the elastic member disposed on the axis of the axle. It is characterized by.

  According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the axle is provided with a pin guide hole communicating with the hollow portion, and the pin guide hole is provided at a tip of the slide shaft member. And a slide pin that engages with a bearing portion of the driven flange is provided, and the driven flange slides on the axle when the slide pin moves along the pin guide hole. It is characterized by.

  According to a fifth aspect of the invention, in addition to the configuration according to any one of the first to fourth aspects, the passive engagement portion is provided along an inner peripheral surface of a wheel boss of the drive wheel. The passive engagement portion and the drive engagement portion engage with each other in a concentric manner in the radial direction of the axle.

  According to a sixth aspect of the present invention, in addition to the configuration of the first aspect, a pin guide hole communicating with the hollow portion is provided on an outer periphery of the axle, and a mounting portion of the driven flange is provided in the hollow portion. An in-axis piston that moves axially inside is provided, and the in-axis piston is provided with a slide pin that projects through the pin guide hole from the inside of the axle to the outside in the radial direction, and the slide pin Is engaged with the driven flange and is movably provided along the pin guide hole, and the in-shaft piston is moved in the engagement direction of the drive engagement portion and the passive engagement portion by the inflow of air. Further, the elastic member disposed in the hollow portion is moved in the disengagement direction between the drive engagement portion and the passive engagement portion.

  According to a seventh aspect of the invention, in addition to the configuration according to any one of the first to sixth aspects, the drive engagement portion of the driven flange and the passive engagement portion provided on the drive wheel. A detection unit that detects slipping, and when the detection unit detects slippage between the drive engagement unit and the passive engagement unit, the drive engagement unit and the passive engagement unit are separated from each other. Features.

  According to the first aspect of the present invention, the driven flange is slid in the axial direction on the axle so that the drive engagement portion and the passive engagement portion can be separated from each other. Therefore, the power transmission loss generated between the drive wheel and the internal combustion engine is reduced, which contributes to the improvement of fuel consumption.

  According to invention of Claim 2, a connection part with the driven flange in a slide drive part is arrange | positioned inside an axle, A weight can be concentrated on an axle. Further, the slide drive member can be made compact by providing the slide shaft member in the axle, and in particular, in a small and light vehicle, it can contribute to the reduction in size and weight. It can contribute to fuel consumption improvement by weight reduction.

  According to the invention of claim 3, since the drive main body portion is constituted by the air cylinder, a small and lightweight structure can be obtained to obtain a driving force for driving the driven flange. Also, the piston is urged by the elastic member in the one-way clutch disengagement direction, for example, by simply releasing the air pressure, the urging force of the elastic member can quickly release the clutch, contributing to improved fuel efficiency. .

  According to the invention of claim 4, since the slide pin provided on the slide shaft member moves along the pin guide hole of the axle and this slide pin is engaged with the driven flange, the amount of movement of the slide pin is reduced. The pin guide hole can restrict the movement of the one-way clutch in the axle direction.

  According to invention of Claim 5, it is provided along the internal peripheral surface of the wheel boss | hub of a drive wheel, and a passive engagement part and a drive engagement part engage along with the concentric form in the radial direction of an axle shaft. Therefore, the passive engagement portion can be disposed so as to be surrounded by the drive wheels, and the installation space in the axle direction of the power transmission device can be made compact. Further, since the one-way clutch is built in the wheel boss, the engaging tooth portion can be protected.

According to the sixth aspect of the present invention, the in-shaft piston that moves in the axial direction in the hollow portion of the axle is provided, and the driven flange is moved by the slide pin attached to the in-shaft piston. The power transmission device can be housed in a compact manner with a structure built in the axle, which contributes to a reduction in size and weight.
Further, since the in-axis piston is urged by the elastic member in the one-way clutch disengagement direction, the quick clutch can be quickly operated by the urging force of the elastic member only by releasing the air pressure on the compact structure. It can be released and contributes to improved fuel efficiency.

  According to the seventh aspect of the present invention, when a slip occurs between the drive engagement portion of the driven flange and the passive engagement portion provided on the drive wheel, the drive engagement portion and the passive portion are detected by a signal from the detection portion that detects the slip. By being configured to be separated from the engaging portion, it is possible to reduce the slip generated in the one-way clutch, reduce the power transmission loss due to the sliding friction, and contribute to the improvement of fuel consumption.

It is a principal part side view of the vehicle provided with the internal combustion engine in 1st Embodiment which concerns on this invention. It is a principal part perspective view of the power transmission device of the vehicle in 1st Embodiment which concerns on this invention. It is a principal part rear view which shows the drive wheel periphery of the power transmission device of the vehicle shown in FIG. It is a principal part cross section which shows the separation state of the one-way clutch in 1st Embodiment which concerns on this invention. It is principal part sectional drawing which shows the engagement state of the one-way clutch in 1st Embodiment which concerns on this invention. It is a principal part top view of the power transmission device of the vehicle in 2nd Embodiment which concerns on this invention. It is principal part sectional drawing in 2nd Embodiment which concerns on this invention. It is sectional drawing of the part along the AA in FIG. It is principal part sectional drawing which shows the separation state of the one-way clutch in 3rd Embodiment which concerns on this invention. It is principal part sectional drawing which shows the engagement state of the one-way clutch in 3rd Embodiment which concerns on this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
A first embodiment of the present invention will be described in detail with reference to FIGS. In addition, about description of directions, such as up and down, right and left, in a specification, it shall be when the attached drawing is seen in the direction of a code | symbol. In FIG. 1, Fr indicates the front of the vehicle, Rr indicates the rear of the vehicle, Up indicates the upper side, and Dw indicates the lower side.

  FIG. 1 shows the periphery of the drive wheel 30 on the rear side of the vehicle 1. As shown in FIG. 1, the vehicle 1 according to the present embodiment is a small and lightweight vehicle in which one drive wheel 30 is disposed at the center of the vehicle width at the rear of the vehicle body. Is provided with an internal combustion engine 5 so that a driver can get on the front side thereof. The drive wheel 30 has, for example, a lightweight structure including a spoke portion 30a extending from the wheel boss 31 to the tire side. As shown in FIGS. 2 and 3, the power transmission device 10 for the internal combustion engine 5 has a structure that transmits the driving force of the internal combustion engine 5 to the drive wheels 30. The power transmission device 10 is rotatably driven on the axle 8. A power transmission member 20 composed of a chain spanned between a flange 21 and a sprocket (not shown) connected to a crankshaft (not shown) of the internal combustion engine 5, and rotatably disposed on the axle 8. The one-way clutch 15 that transmits the driving force in only one direction of the driven flange 21 to the drive wheel 30 and the slide drive unit 40 are provided. A brake device (not shown) having a brake disk is provided on the side of the drive wheel 30 opposite to the power transmission device 10.

  In the present embodiment, the driven flange 21 is provided so as to be slidable in the axial direction of the axle 8. In the driven flange 21, the drive engagement portion 22 and the passive engagement portion 32 are moved between a meshing engagement state and a separated state (non-meshing state) by a slide driving unit 40 described later.

  The one-way clutch 15 is fixed to a drive engagement portion 22 provided on a side surface of the driven flange 21 on the drive wheel 30 side and a side surface of a mounting flange 31a of a wheel boss 31 of the drive wheel 30 via a fixing bolt 31c. And a passive engagement portion 32. The drive engagement portion 22 and the passive engagement portion 32 mesh with each other, so that the driving force of the internal combustion engine 5 is transmitted to the drive wheels 30. As shown in FIG. 3, the one-way clutch 15 is configured such that the power engagement is achieved when the vertical engagement surface 22af of the drive engagement portion 22 and the vertical engagement surface 32af of the passive engagement portion 32 are in contact with each other. While transmission is possible, when a state occurs in which the inclined surface 22as and the inclined surface 32as come into contact with each other, an axial component force is generated by both inclined surfaces, and the drive engagement portion 22 is moved from the passive engagement portion 32. The structure is such that both teeth are not meshed by energizing in the direction of leaving. The wheel boss 31 of the drive wheel 30 is rotatably provided on the axle 8 via a bearing portion 38c.

  In the present embodiment, as shown in FIGS. 3 and 4, the slide drive unit 40 that drives the driven flange 21 is disposed on the axis C of the axle 8 spanned between the vehicle body frames 2 via the holding bracket 44. The drive main body 41 is held, and a slide shaft member 42 is connected to the cylinder shaft 41 b of the drive main body 41 via a connecting nut 48 and extends to the hollow portion 8 a in the axle 8. The drive main body 41 includes an air cylinder main body 41a containing a piston 41p connected to the cylinder shaft 41b, and an air inlet / outlet 41e is provided on the opposite side of the cylinder shaft 41b. Further, an elastic member 41s is provided around the cylinder shaft 41b, and the piston 41p is urged by the elastic member 41s in the disengagement direction (right direction in FIG. 4) of the one-way clutch 15. For example, the holding bracket 44 is fixed to the axle 8 via a fixing nut 44m, and the air cylinder body 41a is fixed to the holding bracket 44 via a fixing nut 44n.

  In the present embodiment, the driven flange 21 is mounted on the axle 8 via a bearing portion 8c so as to be rotatable and slidable in the axial direction. A slide pin 43 is provided at the tip 42e of the slide shaft member 42 extending into the hollow portion 8a of the axle 8 so as to penetrate the pin guide hole 8h in the radial direction from the axle 8 and protrude to the outer surface of the axle 8. ing. The slide pin 43 is engaged with the bearing portion 8 c that holds the driven flange 21. Thereby, the driven flange 21 can be moved via the slide pin 43 by the movement of the slide shaft member 42 in the axle direction. As a result, the driven flange 21 can engage and release the one-way clutch 15.

An air pipe 45 is connected to the air inlet / outlet 41e so that air can be supplied into the air cylinder body 41a. That is, an air circuit 46 including a pump 46a, a check valve 46b, an air tank 46c, a relief valve 46d, and a control valve 46e is connected to the air inlet / outlet port 41e.
A power supply 46f and a switch 46g are connected to the control valve 46e, and air is supplied to the air cylinder main body 41a and exhausted from the air cylinder main body 41a by turning on and off the switch 46g. .

  In the present embodiment, a detection unit 47 that detects slippage between the drive engagement unit 22 and the passive engagement unit 32 is provided. The detection unit 47 starts detection operation when the internal combustion engine 5 is started. That is, detection of the rotational speed of the driven flange 21 and the rotational speed of the drive wheel 30 (converted with the rotational speed of the internal combustion engine 5) is started. On the other hand, the air circuit 46 can be operated by driving the pump 46 a when the internal combustion engine 5 is started. And operation of switch 46g is performed by detection signal S by detector 47, for example.

  In this embodiment, for example, as shown in FIG. 5, the air is supplied to the air cylinder body 41a and the piston 41p is pressed against the pressing force of the elastic member 41s (moves in the direction of arrow X in FIG. 4). In this state, the driving force of the internal combustion engine 5 is transmitted to the drive wheels 30 and the vehicle 1 is traveling. Then, by detecting the rotational speed of the driven flange 21 and the rotational speed of the drive wheel 30, when the vehicle 1 is traveling, a detection signal S is output from the detection unit 47 when there is a difference between both rotational speeds. When the detection signal S at the time of occurrence of slippage is output from the detection unit 47, the switch 46g is activated, and a current flows through the control valve 46e. The relief valve 46d is opened by the operation of the control valve 46e. As a result, the piston 41p is pushed by the pushing force of the elastic member 41s. Then, the air in the air cylinder body 41a is discharged from the air inlet / outlet 41e to the air circuit 46 side, and the slide shaft member 42 moves to the outside of the axle 8 (in the direction of arrow Y in FIG. 4). Due to the movement of the slide shaft member 42, the drive engagement portion 22 is disengaged from the passive engagement portion 32 and is separated from the passive engagement portion 32.

  Thus, when the drive engagement part 22 on the driven flange 21 side slips with respect to the passive engagement part 32 on the drive wheel 30 side, this is detected, and the drive engagement part 22 and the passive engagement part are detected. By separating from 32, the power transmission loss accompanying the slip which generate | occur | produces in the one-way clutch 15 is reduced. As a result, it is possible to contribute to improvement of fuel consumption.

Thus, the slide drive unit 40 in the power transmission device 10 is arranged on the axis C of the axle 8, so that the weight can be concentrated on the axle 8. Further, the slide drive member 42 is provided in the axle 8, so that the slide drive structure can be made compact. In particular, in a small and light vehicle, it can contribute to the reduction in size and weight.
Moreover, according to this embodiment, since the drive main-body part 41 is comprised with the air cylinder, in order to obtain the drive force of the sliding operation of the driven flange 21, it can be made into a small and lightweight structure. Furthermore, since the piston 41p is biased by the elastic member 41s in the disengagement direction of the one-way clutch 15, for example, only by releasing the air pressure, the rapid clutch can be performed by the biasing force of the elastic member 41s. Release is possible.

  Further, the pin guide hole 8h is formed to have a predetermined length along the axial direction of the axle 8, and the movement distance of the slide pin 43 can be restricted. That is, the movement position of the driven flange 21 can be set because the movement position is determined in a state where the slide pin 43 is in contact with the end portion 8hf of the pin guide hole 8h (the state shown in FIG. 4).

  In the present embodiment, the internal combustion engine 5 is provided such that its cylinder 5 a is along the vertical direction of the vehicle 1. Since the cylinder 5a is arranged in the vertical direction as described above, the space in the vehicle height direction can be effectively used, and the length of the vehicle 1 in the front-rear direction can be shortened.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. 6, FIG. 7, and FIG. In the second embodiment, the same components as those of the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

As shown in FIG. 6, in the power transmission device 10 </ b> B of the present embodiment, the one-way clutch 115 is built inside the wheel boss 131 of the drive wheel 30, and has a structure that cannot be seen when the clutch is engaged. is there.
As shown in FIGS. 7 and 8, the structure of the one-way clutch 115 includes a large number of inner peripheral teeth 132t constituting the passive engagement portion 32 inside the wheel boss 131 and an axial diameter along the inner peripheral surface 132a. It protrudes inwardly in a sawtooth shape. As shown in FIG. 8, the inner peripheral teeth 132 t have a triangular shape including a hook surface portion 132 tf substantially along the radial direction when viewed from the axial direction and a sliding surface portion 132 ts substantially along the axial tangential direction. On the other hand, on the driven flange 121, for example, three ratchet claws 122a are arranged at equal intervals in the circumferential direction so as to face the inner peripheral teeth 132t. The ratchet pawl 122a is appropriately biased by a spring member in a direction in which the pawl tip 122ae engages with the hook surface portion 132tf with the pivot fulcrum 122ac as a center.
Therefore, as shown in FIG. 8, the passive engagement portion 132 and the drive engagement portion 122 of the one-way clutch 115 are engaged in a concentric manner in the radial direction of the axle 8.
In addition, the slide drive part 40 in this embodiment is the completely same structure as 1st Embodiment mentioned above. The movement of the driven flange 121 is also exactly the same as in the first embodiment.

  As described above, the one-way clutch 115 is an internal structure in which the drive engagement portion 22 of the driven flange 121 is engaged with the passive engagement portion 132 in the wheel boss 31 of the drive wheel 30, so that the one-way clutch 115 is not exposed. High clutch protection function. In addition, since the clutch engagement structure is a structure that engages concentrically in the radial direction, it is possible to provide the power transmission device 10B in which the installation space in the direction of the axle 8 is reduced.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10.
In the third embodiment, the same components as those of the second embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

The power transmission device 10 </ b> C of the present embodiment has a structure in which a drive system for operating the driven flange 121 along the axis of the axle 8 is provided inside the axle 8. The details of the drive system will be described. A substantially cylindrical in-axis piston 8p that can move in the axial direction is provided in the hollow portion 8a of the axle 8 at the portion where the driven flange 121 is mounted. The in-axis piston 8p is provided with an O-ring 8pw on one end side (right side in FIG. 9) of the outer peripheral surface, and an elastic member receiving portion 8ps receiving the elastic member 8s on the other end side (left side in FIG. 9). It has been. A slide pin 43 is attached at a position close to the elastic member receiving portion 8ps. A lid member 8d for closing the hollow portion 8a is attached to the end portion of the axle 8. The lid member 8d is provided with an O-ring 8dw for sealing the hollow portion 8a, and an air inlet / outlet port 41e connected to the air pipe 45 is formed.
The slide pin 43 that passes through the in-shaft piston 8p passes through a pin guide hole 8h formed in the axle 8 and protrudes from the outer peripheral surface of the axle 8. The slide pin 43 engages with a bearing portion 8c that holds the driven flange 121 rotatably. The wheel boss 131 of the drive wheel 30 is rotatably provided on the axle 8 via a bearing portion 138c.

  The power transmission device 10C of the present embodiment has a structure in which the drive system of the driven flange 121 is provided inside the axle 8, so that the structure can be made compact, and the size and weight can be reduced.

  With this configuration, when air is supplied, as shown in FIG. 10, air accumulates in the cylinder space 8ap between the in-axis piston 8p and the lid member 8d, and the urging force of the elastic member 8s. The in-shaft piston 8p is pushed against this, and the driven flange 121 moves. As a result, the one-way clutch 115 is moved to a position where it is engaged. On the other hand, when the detection unit 47 detects slipping of the one-way clutch 115, the supply of air is cut off, and the driven flange 121 is disengaged from the one-way clutch 115 by the elastic member 8s as shown in FIG. Moved to position.

  As described above, according to this embodiment, since the in-axis piston 8p is urged by the elastic member 8s in the disengagement direction of the one-way clutch 115, the elastic member 8s can be simply released by releasing the air pressure. The urging force can quickly release the clutch, contributing to improved fuel efficiency.

In the above-described embodiment, a chain is used for the power transmission member. However, the present invention is not limited to this, and a belt or the like can also be used.
In the above-described embodiment, an air circuit is used as the slide drive unit. However, a drive structure using a hydraulic system, an electromagnetic valve, or the like may be used.
Further, in each of the above-described embodiments, the drive engagement portion is configured to move with respect to the passive engagement portion. However, the drive engagement portion and the passive engagement portion only need to move relative to each other. A structure in which the engaging portion moves may be used. The piston driving fluid filled in the in-axis piston may be a gas such as air or helium. Also, hydraulic pressure may be used. Furthermore, the in-axis piston may be slid by an electromagnet.

DESCRIPTION OF SYMBOLS 1 Vehicle 5 Internal combustion engine 8 Axle 8a Hollow part 8c Bearing part 8h Pin guide hole 8s, 41s Elastic member 10, 10B, 10C Power transmission device
15, 115 One-way clutch 20 Power transmission member 21, 121 Driven flange 22, 122 Drive engagement portion 30 Drive wheel 31, 131 Wheel boss 32, 132 Passive engagement portion 40 Slide drive portion 41 Drive body portion 41a Air cylinder body 41p Piston 42 Slide shaft member 43 Slide pin 47 Detector 131a Inner peripheral surface

Claims (7)

A power transmission member (20) for transmitting the driving force of the internal combustion engine (5) to a driven flange (21, 121) rotatably provided on the axle (8) of the drive wheel (30);
In the power transmission device (10, 10B, 10C) of the vehicle (1), comprising a one-way clutch (15) that transmits the driving force of the driven flange (21, 121) to the driving wheel (30).
The one-way clutch (15, 115) includes a drive engagement portion (22, 122) provided on the driven flange (21, 121) side and a drive engagement portion provided on the drive wheel (30) side. Passive engagement portions (32, 132) that engage with (22, 122),
The driven flange (21) slides in the axial direction of the axle (8) so that the drive engagement portion (22, 122) and the passive engagement portion (32, 132) can be separated from each other. Power transmission device (10, 10B, 10C) for vehicle (1). A slide drive unit (40) that slide-drives the driven flange (21),
A slide shaft member (42) extending into the axle along the axis of the axle (8) and connected to the driven flange (21) from the inside of the axle (8), and the slide shaft member (42) The power transmission device (10) of the vehicle (1) according to claim 1, further comprising a drive main body (41) for driving the vehicle. The drive main body (41) includes an air cylinder main body (41a) containing a piston (41p) that moves by air inflow,
The piston (41p) is moved in the engagement direction of the drive engagement portion (22) and the passive engagement portion (32) by air inflow, and is disposed on the axis of the axle (8) ( The power transmission of the vehicle (1) according to claim 2, wherein the drive engagement portion (22) and the passive engagement portion (32) are moved in a disengagement direction by 41s, 8s). Device (10). The axle (8) is provided with a pin guide hole (8h) communicating with the hollow portion (8a),
At the tip of the slide shaft member (42), a slide pin (43) that penetrates the pin guide hole (8h) and engages with the bearing portion (8c) of the driven flange (21) is provided.
4. The driven flange (21) slides on the axle (8) by moving the slide pin (43) along the pin guide hole (8h). The power transmission device (10) of the vehicle (1) described. The passive engagement portion (132) is provided along the inner peripheral surface (131a) of the wheel boss (131) of the drive wheel (30),
The said passive engagement part (132) and the said drive engagement part (122) engage along with the concentric form in the radial direction of the said axle shaft (8), and are engaged. The power transmission device (10B) of the vehicle (1) according to the item. A pin guide hole (8h) communicating with the hollow portion (8a) is provided on the outer periphery of the axle (8), and the hollow portion (8a) is provided inside the mounting portion of the driven flange (121). An in-axis piston (8p) that moves in the axial direction is provided,
The in-shaft piston (8p) is provided with a slide pin (43) projecting through the pin guide hole (8h) from the inside of the axle (8) to the outside in the radial direction,
The slide pin (43) engages with the driven flange (121) and is provided to be movable along the pin guide hole (8h).
The in-shaft piston (8p) is moved in the engagement direction between the drive engagement portion (122) and the passive engagement portion (132) by air inflow, and is an elastic member (disposed in the hollow portion (8a)). The power transmission device for a vehicle (1) according to claim 1, wherein the drive engagement portion (122) and the passive engagement portion (132) are moved in a disengagement direction by 8s). 10C). A detection unit (47) for detecting a slip between the drive engagement portion (22, 122) of the driven flange (21, 121) and the passive engagement portion (32, 132) provided on the drive wheel (30). )
When the detection portion (47) detects slippage between the drive engagement portion (22, 122) and the passive engagement portion (32, 132), the drive engagement portion (22, 122) and the passive portion The power transmission device (10, 10B, 10C) of the vehicle (1) according to any one of claims 1 to 6, characterized in that the engaging portion (32, 132) is spaced apart.

Images