Power transmission shaft and vehicle equipped with same

Abstract

To provide a power transmission shaft corresponding to transmission of larger torque and a vehicle including the power transmission shaft.SOLUTION: A power transmission shaft connects two rotating devices with each other and can transmit power from one device to the other device. The power transmission shaft includes: an FRP shaft extending around the axis; and a pair of metallic flanges connected to the FRP shaft in the axial direction. The FRP shaft includes a first cylindrical part and a pair of second cylindrical parts integrally connected to the first cylindrical part. The second cylindrical part includes: a base part connected to the first cylindrical part; and a plurality of projecting parts projecting from the base part in the axial direction and disposed in the circumferential direction at regular intervals while leaving gaps from each other to form a plurality of key grooves extending in the axial direction together with the base part. The metallic flange includes: a connection part rotatably connected to the device; and a plurality of keys projecting from the connection part in the axial direction and fitted to the key grooves, respectively. The circumferential thickness of the projecting part is larger than the circumferential thickness of the key.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a power transmission shaft and a vehicle including the same. [Background technology]

[0002] For example, Patent Document 1 discloses an FRP drive shaft used as a vehicle propeller shaft (power transmission shaft). In this FRP drive shaft, the wave-shaped engaging portions of the FRP cylinder and the metal butt collar are in surface contact with each other, and an end joint is disposed across the FRP cylinder and the butt collar. The outer circumferential surface of the end joint is formed with serrations that are press-fitted into the FRP cylinder and the butt collar.

[0003] As a result, when torque is transmitted between the end joint and the FRP cylinder, the torque is applied simultaneously to the inside and outside of the FRP cylinder via the wave-shaped engaging parts that are in surface contact with each other, making it less likely that the FRP cylinder will break due to torque load. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-52720 Summary of the Invention [Problem to be solved by the invention]

[0005] Recently, there has been a demand for a power transmission shaft for vehicles that can transmit large torque. In the FRP drive shaft described in Patent Document 1, it is highly likely that the circumferential thickness of the wave-shaped engaging portion of the FRP cylinder and the abutting collar is the same. Therefore, as the torque increases, stress concentrates on the FRP cylinder and the abutting collar, and as a result, deformation due to the difference in the materials that make them up can become significant.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a power transmission shaft capable of transmitting a larger torque, and a vehicle equipped with the same. [Means for solving the problem]

[0007] In order to solve the above problems, a power transmission shaft according to the present disclosure is a power transmission shaft that connects two rotating devices and is capable of transmitting power from one of the devices to the other, and includes an FRP shaft extending about an axis, and a pair of metal flanges connected to the FRP shaft in the axial direction, wherein the FRP shaft has a first cylindrical portion and a pair of second cylindrical portions integrally connected to the first cylindrical portion, and the second cylindrical portions have a base portion connected to the first cylindrical portion, and protruding portions that protrude from the base portion in the axial direction and form a plurality of keyways that extend in the axial direction together with the base portion by being arranged at equal circumferential intervals with gaps between them, and the metal flanges have a connection portion rotatably connected to the devices, and a plurality of keys that protrude from the connection portion in the axial direction and are fitted one by one into the keyways, and the circumferential thickness of the protruding portions is greater than the circumferential thickness of the keys. The end of the protrusion in the circumferential direction has a convex curved surface that is convex in the circumferential direction, and the surface of the key facing the circumferential direction forms a concave curved surface that conforms to the convex curved surface. .

[0008] A vehicle according to the present disclosure includes the above-described power transmission shaft. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a power transmission shaft capable of transmitting a larger torque, and a vehicle equipped with the same. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a schematic configuration of a vehicle according to an embodiment of the present disclosure as viewed from above. [Figure 2] 1 is a diagram showing a schematic configuration of a vehicle according to an embodiment of the present disclosure as viewed from the side. [Figure 3] FIG. 1 is an exploded perspective view of a power transmission shaft according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 4 is a partial cross-sectional view taken along line VV in FIG. [Figure 6] 5 is a partial cross-sectional view of a power transmission shaft according to another embodiment of the present disclosure, the view corresponding to the portion shown in FIG. 4. FIG. [Figure 7] 6 is a partial cross-sectional view of a power transmission shaft according to another embodiment of the present disclosure, and corresponds to the portion shown in FIG. 5. FIG. [Figure 8] 5 is a partial cross-sectional view of a power transmission shaft according to another embodiment of the present disclosure, the view corresponding to the portion shown in FIG. 4. FIG. [Figure 9] 6 is a partial cross-sectional view of a power transmission shaft according to another embodiment of the present disclosure, and corresponds to the portion shown in FIG. 5. FIG. [Figure 10] 10A and 10B are views of a second cylindrical portion in an FRP shaft according to another embodiment of the present disclosure, viewed in the axial direction from one side or the other side. [Figure 11] FIG. 10 is a view of a metal flange portion according to another embodiment of the present disclosure, viewed in the axial direction from the FRP shaft side. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of a vehicle according to the present disclosure will be described with reference to the accompanying drawings.

[0012] (vehicle) The vehicle in this embodiment is a vehicle for traveling on rough terrain. As shown in Figures 1 and 2, the vehicle 100 includes a vehicle body 1, an engine 2, drive wheels 3, driven wheels 4, a rear wheel drive shaft 5, a rear power distribution unit 6, a front power distribution unit 7, a front wheel drive shaft 8, a first power transmission shaft 9a (power transmission shaft), and a second power transmission shaft 9b (power transmission shaft).

[0013] The vehicle body 1 is a vehicle body that forms the outer shell of the vehicle 100. For ease of explanation, the front-to-rear direction of the vehicle body 1 will be simply referred to as the "front-to-rear direction Df," and the left-to-right direction (vehicle width direction) of the vehicle body 1 will be simply referred to as the "left-to-right direction Dw." Furthermore, the front side in the front-to-rear direction Df will be referred to as the "front side Dff," and the rear side in the front-to-rear direction Df will be referred to as the "rear side Dfr." The engine 2 is disposed inside the vehicle body 1.

[0014] The drive wheels 3 are rotated by being driven by the engine 2. In this embodiment, the drive wheels 3 are arranged Dff in front of the engine 2. The drive wheels 3 are arranged in a pair with a gap in the left-right direction Dw of the vehicle body 1. The driven wheels 4 are arranged Dfr in rear of the engine 2. In this embodiment, the driven wheels 4 are arranged in a pair with a gap in the left-right direction Dw of the vehicle body 1.

[0015] The rear power distribution unit 6 is disposed in a region Dfr rearward of the engine 2 in the vehicle body 1. A first power transmission shaft 9a extends from the engine 2 toward the rear Dfr. The rear power distribution unit 6 is connected to the rear end of this first power transmission shaft 9a. This first power transmission shaft 9a transmits power from the engine 2 to the rear power distribution unit 6.

[0016] The rear power distribution unit 6 has a function of changing the rotation speed of the first power transmission shaft 9a and transmitting a portion of the power from the first power transmission shaft 9a to the rear wheel drive shaft 5. In addition, the rear power distribution unit 6 distributes the power from the engine 2 to the front power distribution unit 7 and the rear wheel drive shaft 5.

[0017] The front power distribution section 7 is disposed between the pair of drive wheels 3 in the vehicle body 1. The front power distribution section 7 is disposed forward Dff of the engine 2. The second power transmission shaft 9b extends from the rear power distribution section 6 to the front Dff. The front end of the second power transmission shaft 9b is connected to the front power distribution section 7. The second power transmission shaft 9b is disposed below the engine 2. The second power transmission shaft 9b transmits power from the rear power distribution section 6 to the front power distribution section 7.

[0018] The front wheel drive shaft 8 extends in the left-right direction Dw from the front power distribution unit 7. Drive wheels 3 are attached to both ends of this front wheel drive shaft 8. This front power distribution unit 7 has the function of transmitting power from the second power transmission shaft 9b to the front wheel drive shaft 8 by changing the rotation speed of the second power transmission shaft 9b.

[0019] The first power transmission shaft 9a and the second power transmission shaft 9b described above have basically the same configuration except for dimensions, etc. Therefore, hereinafter, the first power transmission shaft 9a and the second power transmission shaft 9b will be collectively referred to as the "power transmission shaft 9."

[0020] (power transmission shaft) The power transmission shaft 9 is a shaft that connects two rotating devices and is capable of transmitting power from one device to the other. Therefore, the power transmission shaft 9 in this embodiment connects two devices, namely the engine 2 and the rear power distribution unit 6, and the rear power distribution unit 6 and the front power distribution unit 7. As shown in Figure 3, the power transmission shaft 9 includes an FRP shaft 10, a metal flange 11, and an adhesive portion 12 (see Figures 4 and 5).

[0021] (FRP axis) The FRP shaft 10 has a cylindrical shape extending about an axis O. In this embodiment, the axis O extends horizontally. Hereinafter, the direction in which this axis O extends will be referred to as the "axial direction Da," the circumferential direction Dc relative to this axis O will be simply referred to as the "circumferential direction Dc," and the direction perpendicular to the axis O will be referred to as the "radial direction." Furthermore, of both sides of the axial direction Da, one side will be simply referred to as the "one side Daf," ​​and the opposite side will be referred to as the "other side Dar." Furthermore, the side closer to the axis O in the radial direction will be referred to as the "radially inner side," and the opposite side will be referred to as the "radially outer side." Therefore, the axial direction Da in this embodiment coincides with the fore-and-aft direction Df of the vehicle 100.

[0022] The FRP shaft 10 is made of fiber reinforced plastics (FRP). The FRP shaft 10 has a first cylindrical portion 101 and a second cylindrical portion 102.

[0023] The first cylindrical portion 101 has a cylindrical shape extending about an axis O. The second cylindrical portion 102 is connected to the first cylindrical portion 101 in the axial direction Da as a pair. The second cylindrical portion 102 is disposed on one side Daf and the other side Dar of the first cylindrical portion 101. As shown in FIGS. 3, 4, and 5, the second cylindrical portion 102 has a base portion 103 and a protruding portion 104.

[0024] For ease of explanation, the following will describe the second cylindrical portion 102 arranged on one side Daf of the first cylindrical portion 101. The second cylindrical portion 102 arranged on the other side Dar of the first cylindrical portion 101 has the same shape as the second cylindrical portion 102 arranged on one side Daf of the first cylindrical portion 101, and therefore its explanation will be omitted.

[0025] The base 103 is integrally connected to the first cylindrical portion 101 from one side Daf. In this embodiment, the base 103 has a first base 103a having a truncated cone shape whose diameter increases from the connection with the first cylindrical portion 101 toward the one side Daf, and a second base 103b having a cylindrical shape formed integrally with the first base 103a from the one side Daf.

[0026] The protrusion 104 protrudes from an end of one side Daf of the second base portion 103b toward the one side Daf. A plurality of protrusions 104 are arranged at equal intervals in the circumferential direction Dc with gaps between them. In this embodiment, for example, six protrusions 104 are arranged in the circumferential direction Dc. The end of each protrusion 104 in the circumferential direction Dc has a pair of faces facing the circumferential direction Dc. Therefore, the faces of two protrusions 104 adjacent in the circumferential direction Dc face each other in the circumferential direction Dc. The faces of the protrusions 104 rise from the end face of one side Daf of the second base portion 103b toward the axial direction Da. Here, the angle formed by the face of the protrusion 104 and an imaginary plane perpendicular to the axis O is, for example, 80 to 100°.

[0027] In this embodiment, a gap defined by the surfaces of the two protruding portions 104 adjacent to each other in the circumferential direction Dc and the end face on one side Daf of the second base portion 103b serves as a key groove 105. The key groove 105 extends in the axial direction Da.

[0028] (metal flange) The metal flange 11 is a member that connects the above-mentioned device and the FRP shaft 10. The metal flange 11 is disposed between the above-mentioned device and the FRP shaft 10. A pair of the metal flanges 11 are connected to the second cylindrical portion 102 of the FRP shaft 10 in the axial direction Da. The metal flanges 11 are formed of a metal such as an alloy. The metal flange 11 has a connection portion 111, a plurality of keys 112, and a wrap portion 113.

[0029] The following describes the metal flange 11 of the pair of metal flanges 11 that is arranged on one side Daf of the FRP shaft 10. The metal flange 11 that is arranged on the other side Dar of the FRP shaft 10 has the same shape as the metal flange 11 that is arranged on one side Daf of the FRP shaft 10, and therefore its description will be omitted.

[0030] The connecting portion 111 has an annular shape centered on the axis O. The connecting portion 111 is connected to the above-mentioned device so as to be rotatable about the axis O. A plurality of keys 112 protrude from the connecting portion 111 to the other side Dar. The plurality of keys 112 are fitted into key grooves 105 formed in the second cylindrical portion 102 by being inserted one by one into the key grooves 105. Therefore, as shown in FIG. 3, the plurality (six) of keys 112 are arranged at equal intervals in the circumferential direction Dc with a gap between them. The key 112 has a pair of faces facing the circumferential direction Dc. In other words, the face of the key 112 and the face of the protruding portion 104 face each other in the circumferential direction Dc. Here, the angle formed by the face of the key 112 and an imaginary plane perpendicular to the axis O is 80 to 100°. The face of the key 112 and the face of the protruding portion 104 are parallel to each other. The term "parallel" used here refers to a substantially parallel state, and slight manufacturing errors and design tolerances are allowed.

[0031] Here, the thickness of the key 112 in the circumferential direction Dc is th2, and the thickness of the protrusion 104 in the circumferential direction Dc is th1. The thickness th2 of the key 112 in the circumferential direction Dc is smaller than the thickness th1 of the protrusion 104 in the circumferential direction Dc. In other words, the thickness th1 of the protrusion 104 in the circumferential direction Dc is larger than the thickness th2 of the key 112 in the circumferential direction Dc. The thickness in the circumferential direction Dc here refers to the length of an imaginary dimension line extending in the circumferential direction Dc.

[0032] The value obtained by dividing the thickness th1 of the protrusion 104 in the circumferential direction Dc by the thickness th2 of the key 112 in the circumferential direction Dc is referred to as "th1 / th2." In this embodiment, the following formula (i) holds. 1 <th1 / th2≦15 …(i)

[0033] More preferably, it is represented by the following formula (ii): 4≦th1 / th2≦10 …(ii)

[0034] The wrap portion 113 is formed integrally with the connecting portion 111 in a cylindrical shape extending about the axis O. The wrap portion 113 is disposed on the other side Dar of the connecting portion 111. The wrap portion 113 has an inner wrap portion 113a disposed radially inward relative to the key 112 and an outer wrap portion 113b disposed radially outward relative to the key 112.

[0035] The inner wrap portion 113a and the outer wrap portion 113b are disposed integrally with the keys 112. Therefore, the multiple keys 112 are sandwiched between the inner wrap portion 113a and the outer wrap portion 113b in the radial direction. The end faces of the inner wrap portion 113a and the outer wrap portion 113b on the other side Dar are disposed closer to the other side Dar than the multiple keys 112. Therefore, a space in which the second base portion 103b is disposed is formed between the inner wrap portion 113a and the outer wrap portion 113b.

[0036] (Adhesive part) The adhesive portion 12 is made of synthetic resin. As shown in Fig. 5, the adhesive portion 12 is disposed without gaps between the protruding portion 104 and the connecting portion 111, and between the protruding portion 104 and the wrap portion 113, and connects the two to each other using an adhesive. Although not shown due to space limitations, the adhesive portion 12 is also disposed without gaps between the protruding portion 104 and the key 112, and connects the two to each other using an adhesive.

[0037] 4, the adhesive 12 is disposed between the second base portion 103b of the second cylindrical portion 102 and the wrap portion 113, connecting them together with an adhesive. Therefore, the adhesive 12 is disposed in the gap formed between the FRP shaft 10 and the metal flange 11 in the region where the FRP shaft 10 and the metal flange 11 overlap in the radial direction, the circumferential direction Dc, and the axial direction Da. The thickness of the adhesive 12 in this embodiment is, for example, 0.1 to 1.5 mm.

[0038] (Action and effect) Since each connection part 111 in the pair of metal flanges 11 is rotatably connected to the device, as the device rotates, the metal flange 11 and the FRP shaft 10 connected to this metal flange 11 rotate. That is, the power transmission shaft 9 including these metal flanges 11 and FRP shaft 10 is connected so as to bridge the two devices. Therefore, the power transmission shaft 9 can transmit the rotational torque of one device to the other device. At this time, stress concentration occurs at the connection part between the metal flange 11 and the FRP shaft 10.

[0039] In the configuration described in the above embodiment, it is characterized by the relationship between the thickness th1 in the circumferential direction Dc of the protruding portion 104 that forms the key groove 105 together with the base portion 103 and the thickness th2 in the circumferential direction Dc of the key 112 that fits into this key groove 105. That is, the thickness th1 in the circumferential direction Dc of the protruding portion 104 formed of fiber-reinforced plastic is larger than the thickness th2 in the circumferential direction Dc of the key 112 formed of metal. Specifically, when the thickness in the circumferential direction Dc of the protruding portion 104 is th1 and the thickness in the circumferential direction Dc of the key 112 is th2, 1 < th1 / th2 ≦ 15 holds.

[0040] Here, between the protruding portion 104 formed of fiber-reinforced plastic and the key 112 formed of metal, the key 112 has higher rigidity than the protruding portion 104. With the above configuration, for example, compared with the case where the thicknesses in these circumferential directions Dc are the same, the difference in rigidity due to the difference in these materials can be averaged. That is, when stress is concentrated on the protruding portion 104, deformation of the protruding portion 104 can be suppressed. Therefore, the power transmission shaft 9 can cope with the transmission of a larger torque between the two rotating devices.

[0041] Furthermore, the key 112 protruding from the connecting portion 111 in the axial direction Da is fitted into a key groove 105 formed in the second cylindrical portion 102 and extending in the axial direction Da. Therefore, when the power transmission shaft 9 rotates in conjunction with the rotation of the device, the generation of a force component acting in the axial direction Da among the forces acting on the key 112 and the second cylindrical portion 102 is suppressed. In other words, it is possible to prevent the key 112 from being pulled out of the key groove 105.

[0042] Furthermore, according to the above-described configuration, the wrap portions 113 formed integrally with the connecting portion 111 and the multiple keys 112 are disposed radially outward and inward relative to the keys 112, so that when the power transmission shaft 9 rotates, the radial movement of the protrusions 104 is restricted by the wrap portions 113. Therefore, it is possible to prevent misalignment between the FRP shaft 10 and the metal flange 11.

[0043] Furthermore, according to the above-described configuration, the adhesive 12 is disposed in the gap formed between the FRP shaft 10 and the metal flange 11, and therefore, when the second cylindrical portion 102 and the key 112 are deformed due to, for example, thermal stress, the adhesive 12 functions as a buffer. That is, the adhesive 12 can suppress variations in the loads applied to the second cylindrical portion 102 and the key 112. This can suppress damage such as deformation and wear of the second cylindrical portion 102 and the key 112, thereby suppressing deterioration over time of the power transmission shaft 9. Furthermore, the adhesive 12 blocks outside air, thereby preventing corrosion of the connection portion 111, the key 112, and the wrap portion 113.

[0044] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to the configuration of the embodiment, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope that does not deviate from the gist of the present disclosure.

[0045] 6 and 7, the wrap portion 113 may have only the inner wrap portion 113a without the outer wrap portion 113b. In this case, the adhesive portion 12 may be disposed between the protruding portion 104 and the connecting portion 111, and between the protruding portion 104 and the inner wrap portion 113a.

[0046] 8 and 9, the wrap portion 113 may have only the outer wrap portion 113b without the inner wrap portion 113a. In this case, the adhesive portion 12 may be disposed between the protruding portion 104 and the connecting portion 111, and between the protruding portion 104 and the outer wrap portion 113b.

[0047] 10, an end of each protrusion 104 in the circumferential direction Dc may have a convex curved surface 104a that is convex toward the circumferential direction Dc. In this case, as shown in FIG. 11, the surface of each key 112 facing the circumferential direction Dc may be a concave curved surface 112a that conforms to the convex curved surface 104a of the protrusion 104. This reduces stress concentration in the surface pressure that the protrusion 104 receives from the key 112, compared to when the surfaces of the protrusion 104 and the keys 112 are each flat. As a result, damage such as deformation and wear of the second cylindrical portion 102 and the keys 112 can be suppressed.

[0048] In addition, in the embodiment, the vehicle 100 is described as a vehicle for traveling on rough terrain, but the present invention is not limited to this. The vehicle 100 may be, for example, an automobile. Even in this case, the power transmission shaft 9 may be used as a propeller shaft that connects two devices provided in the automobile, namely, an engine and a drive shaft (wheel drive shaft).

[0049] <Additional Notes> The power transmission shaft described in the embodiment and a vehicle equipped with the same can be understood, for example, as follows.

[0050] (1) The power transmission shaft 9 according to the first aspect is a power transmission shaft 9 that connects two rotating devices and can transmit power from one of the devices to the other. The power transmission shaft 9 includes an FRP shaft 10 extending around an axis O, and a pair of metal flanges 11 connected to the FRP shaft 10 in the axial direction Da. The FRP shaft 10 has a first cylindrical portion 101 and a pair of second cylindrical portions 102 integrally connected to the first cylindrical portion 101. The second cylindrical portion 102 has a base portion 103 connected to the first cylindrical portion 101, and a protruding portion 104 that protrudes from the base portion 103 in the axial direction Da and is arranged at equal intervals in the circumferential direction Dc with a gap between them, thereby forming a plurality of key grooves 105 together with the base portion 103. The metal flange 11 has a connecting portion 111 rotatably connected to the device, and a plurality of keys 112 that protrude from the connecting portion 111 in the axial direction Da and are respectively fitted into the key grooves 105. The thickness th1 of the protruding portion 104 in the circumferential direction Dc is larger than the thickness th2 of the key 112 in the circumferential direction Dc.

[0051] Thus, compared with the case where the thickness th1 of the protruding portion 104 in the circumferential direction Dc is the same as the thickness th2 of the key 112 in the circumferential direction Dc, when a load is concentrated on the protruding portion 104, deformation of the protruding portion 104 can be suppressed. That is, the occurrence of deformation and the like due to the difference in material can be suppressed.

[0052] (2) The power transmission shaft 9 according to the second aspect is the power transmission shaft 9 of (1). When the thickness of the protruding portion 104 in the circumferential direction Dc is th1 and the thickness of the key 112 in the circumferential direction Dc is th2, 1 < th1 / th2 ≤ 15 may be satisfied.

[0053] Thereby, the above action can be realized with more specific design values, and the above action can be enhanced.

[0054] (3) The power transmission shaft 9 according to the third aspect is the power transmission shaft 9 of (1) or (2), wherein the metal flange 11 has a cylindrical shape extending around the axis O and further has a wrap portion 113 formed integrally with the connection portion 111, and the wrap portion 113 may be arranged integrally with the multiple keys 112 from one or more of the radial inside and outside of the multiple keys 112.

[0055] As a result, when the power transmission shaft 9 rotates, the wrap portion 113 restricts the radial movement of the protrusion 104 .

[0056] (4) The power transmission shaft 9 according to the fourth aspect is the power transmission shaft 9 of (3), and may further include an adhesive portion 12 that is disposed at one or more of between the protrusion 104 and the connection portion 111, between the protrusion 104 and the key 112, and between the protrusion 104 and the wrap portion 113, and that connects the two together as an adhesive.

[0057] As a result, when the second cylindrical portion 102 and the key 112 are deformed due to, for example, thermal stress, the adhesive portion 12 functions as a buffer material. In other words, the adhesive portion 12 can suppress variations in the loads applied to the second cylindrical portion 102 and the key 112.

[0058] (5) The power transmission shaft 9 according to the fifth aspect is a power transmission shaft 9 according to any one of (1) to (4), wherein the end of the protrusion 104 in the circumferential direction Dc has a convex curved surface 104a that is convex toward the circumferential direction Dc, and the surface of the key 112 facing the circumferential direction Dc may form a concave curved surface 112a that conforms to the convex curved surface 104a.

[0059] This reduces the surface pressure that the protrusion 104 receives from the key 112.

[0060] (6) A vehicle 100 according to a sixth aspect includes a power transmission shaft 9 according to any one of (1) to (5). [Explanation of symbols]

[0061] DESCRIPTION OF SYMBOLS 1...Vehicle body 1f...leading edge 1r...trailing edge 2...engine 3...driving wheel 4...driven wheel 5...rear wheel drive shaft 6...rear power distribution section 7...front power distribution section 8...front wheel drive shaft 9...power transmission shaft 9a...first power transmission shaft 9b...second power transmission shaft 10...FRP shaft 11...metal flange 12...adhesion section 100...vehicle 101...first cylindrical section 102...second cylindrical section 103...base section 103a...first base section 103b...second base section 104...projection section 104a...convex curved surface 105...key groove 111...connection section 112...key 112a...concave curved surface 113...lap section 113a...inner lap section 113b...outer lap section Da...axial direction Daf...one side Dar...other side Dc...circumferential direction Df...front-rear direction Dff...Front side Dfr...Rear side Dw...Left and right direction th1...Circumferential thickness at protrusion th2...Circumferential thickness at key O...Axis

Claims

1. A power transmission shaft that connects two rotating devices and can transmit power from one of the devices to the other, an FRP shaft extending around an axis line; a pair of metal flanges connected to the FRP shaft in the axial direction; Equipped with The FRP shaft is a first cylindrical portion; a pair of second cylindrical portions integrally connected to the first cylindrical portion; and The second cylindrical portion is a base connected to the first cylindrical portion; a plurality of protruding portions protruding from the base portion in the axial direction and arranged at equal intervals in the circumferential direction with gaps therebetween, thereby forming, together with the base portion, a plurality of key grooves extending in the axial direction; and The metal flange is a connection part rotatably connected to the device; a plurality of keys projecting from the connection portion in the axial direction and fitted one by one into the key grooves, a thickness of the protrusion in the circumferential direction is greater than a thickness of the key in the circumferential direction; an end portion of the protruding portion in the circumferential direction has a convex curved surface that is convex in the circumferential direction, A power transmission shaft, wherein the surface of the key facing the circumferential direction forms a concave curved surface that conforms to the convex curved surface.

2. a thickness of the protruding portion in the circumferential direction is defined as th1; When the thickness of the key in the circumferential direction is th2, 1<th1 / th2≦15 2. The power transmission shaft according to claim 1, wherein the following holds true:

3. the metal flange further includes a wrap portion formed integrally with the connection portion in a cylindrical shape extending about the axis, 3. The power transmission shaft according to claim 1, wherein the wrap portion is disposed integrally with the plurality of keys from at least one of the inside and outside in the radial direction of the plurality of keys.

4. 4. The power transmission shaft according to claim 3, further comprising an adhesive portion disposed at one or more of between the protrusion and the connection portion, between the protrusion and the key, and between the protrusion and the wrap portion, and connecting the two together as an adhesive.

5. A vehicle comprising the power transmission shaft according to claim 1 or 2.

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