Boot, power transmission shaft, and propeller shaft

Abstract

To improve workability of fastening work by a boot band.SOLUTION: A boot of the invention has a first fixed part 41 to be fixed to an outer periphery of an outer ring member 3a. The first fixed part 41 has a first recessed part 41A which is recessed so as to get close to a rotation axis 100a of the outer ring member 3a. The first recessed part 41A has: a first member side wall 41a provided at the side of the outer ring member 3a in a direction along the rotation axis 100a; and a second member side wall 41b provided at the side of a second shaft part (a second member) 1C in the direction along the rotation axis 100a. A dimension (an outer diameter) φ41b in a radial direction orthogonal to the rotation axis 100a of the second member side wall 41b is larger than a dimension (an outer diameter) φ41a in the radial direction of the first member side wall 41a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to boots, power transmission shafts and propeller shafts used in automobiles, for example. [Background technology]

[0002] Patent Document 1 describes a boot for a constant velocity joint (paragraphs 0022-0023) that includes a first fixed part that is fixed by a first clamp to a case of a constant velocity joint serving as a universal joint, a second fixed part that is fixed by a second clamp to a driven shaft that is held swingably within the case, and a bellows part that connects the first fixed part and the second fixed part. An engagement groove into which the first clamp is attached is formed around the entire outer periphery of the first fixed part (paragraph 0024). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-205291 Summary of the Invention [Problem to be solved by the invention]

[0004] In the boot for a constant velocity joint in Patent Document 1, sufficient consideration is not given to the depth of the engagement groove into which the first clamp is attached. If the engagement groove is shallow, when the first clamp is attached to the engagement groove, the first clamp may be fastened while biting into the wall at the end of the engagement groove, making it impossible to ensure sealing. To avoid such a fastening state of the first clamp, the workability of fastening the first clamp becomes poor. In this specification, a boot band (first boot band) is used as the first clamp.

[0005] An object of the present invention is to improve the workability of fastening work using a boot band. [Means for solving the problem]

[0006] In order to achieve the above object, the boot of the present invention comprises: A boot is provided across a rotating first member and a second member connected to the first member and rotating together with the first member, a first fixing portion fixed to an outer periphery of the first member; a second fixing portion fixed to the outer periphery of the second member; Equipped with the first fixing portion is recessed so as to approach the rotation axis of the first member and has a first recess to which a first boot band is fastened; the first recess has a first-member-side sidewall provided on the first member side in the direction along the rotation axis, and a second-member-side sidewall provided on the second member side in the direction along the rotation axis, The second member side wall is formed so that a dimension in a radial direction perpendicular to the rotation axis is larger than a dimension in the radial direction of the first member side wall.

[0007] In order to achieve the above object, the power transmission shaft of the present invention comprises: a first rotating member; A second rotating member; a constant velocity joint including an inner ring member connected to the second rotating member, an outer ring member connected to the first rotating member, and a ball member disposed between the inner ring member and the outer ring member, wherein rotation is transmitted from the inner ring member to the outer ring member via the ball member; a boot provided between the outer ring member and the second rotating member of the constant velocity joint; a first boot band for fastening the boot; a second boot band for fastening the boot; Equipped with The boots are a first fixing portion fixed to an outer periphery of the outer ring member of the constant velocity joint by the first boot band; a second fixing portion fixed to the outer periphery of the second rotating member by the second boot band; and The first fixing portion is a first recess recessed toward the rotation axis of the first rotating member; a first rotating member side wall of the first recess provided on the first rotating member side of the first recess in a direction along the rotation axis; a second rotating member side wall of the first recess provided on the second rotating member side of the first recess in a direction along the rotation axis, a side wall of the first recessed portion on the second rotating member side is formed so that a dimension in a radial direction perpendicular to the rotation axis is larger than a dimension in the radial direction of the side wall of the first recessed portion on the first rotating member side, The second boot band fixing portion is a second recess recessed toward the rotation axis; a first rotating member side wall of the second recess provided on the first rotating member side of the second recess in a direction along the rotation axis; a second rotating member-side sidewall of the second recess provided on the second rotating member side of the second recess in the direction along the rotation axis, The side wall of the second recess on the side of the second rotating member is formed so that the dimension in the radial direction perpendicular to the rotation axis is smaller than the dimension in the radial direction of the side wall of the second recess on the side of the first rotating member.

[0008] In order to achieve the above object, the propeller shaft of the present invention comprises: A propeller shaft that transmits rotational force from a power source of a vehicle to wheels of the vehicle, A shaft member; a boot member attached to the outside of the shaft member in a radial direction perpendicular to the central axis of the shaft member; a fixing portion formed on an outer peripheral surface of the boot member and having a recess recessed from the outside toward the inside in the radial direction; a boot band wound around the fixing portion, the recess has a bottom, a first side wall connected to one end of the bottom in a direction along the central axis and extending radially outward, and a second side wall connected to the other end of the bottom in a direction along the central axis and extending radially outward, an outer diameter of the first side wall portion is smaller than an inner diameter of the boot band before the boot band is attached; The outer diameter of the second side wall portion is larger than the inner diameter of the boot band before the boot band is attached. [Effects of the Invention]

[0009] According to the present invention, the workability of fastening work using a boot band can be improved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partial cross-sectional view of a power transmission shaft according to an embodiment of the present invention; [Figure 2] 2 is an enlarged view showing a partial cross section of the constant velocity joint 3, the boot 4, and their vicinity, with boot bands 5 and 6 fastened. FIG. [Figure 3] 4 is an enlarged, partially cross-sectional view of the constant velocity joint and the vicinity of the boot, showing a state before the boot band is fastened. FIG. [Figure 4] 4 is an enlarged, partially cross-sectional view of the constant velocity joint and the vicinity of the boot, showing a state in which a boot band is fastened. FIG. [Figure 5] FIG. 10 shows an adjustable clamp having a mechanical interlock structure. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A support device for a power transmission shaft according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In the following description, a propeller shaft of a vehicle will be used as an example of the power transmission shaft.

[0012] FIG. 1 is a partial cross-sectional view of one embodiment (first embodiment) of a power transmission shaft according to the present invention.

[0013] Vehicle propeller shaft 100 is applied to vehicles using drive systems such as four-wheel drive and front-engine, rear-drive. Propeller shaft 100 is configured by connecting multiple shaft sections 1A, 1B, and 1C via joints 2A, constant velocity joints 3, etc., and transmits the rotational force of the vehicle's drive source to the drive wheels. Shaft section 1B constitutes a drive shaft connected to the transmission side. Shaft sections 1A and 1C constitute a driven shaft driven by drive shaft 1B.

[0014] In the following description, the line passing through the shaft center of the propeller shaft 100 will be referred to as the central axis 100a. The central axis 100a is a straight line passing through the center of rotation of the propeller shaft 100, and may also be referred to as the rotation axis. The central axes and rotation axes of the multiple shaft portions 1A, 1B, 1C coincide with the central axis 100a.

[0015] In this embodiment, the drive shaft 1B and the driven shaft 1A are connected by a joint 2A. The joint 2A is, for example, a Cardan joint, which is a universal joint. The driven shaft is configured with a first shaft portion 1A and a second shaft portion 1C, and a constant velocity joint 3 is provided between the first shaft portion 1A and the second shaft portion 1C. In other words, the first shaft portion 1A and the second shaft portion 1C are connected by the constant velocity joint 3.

[0016] More specifically, one end 1Ca of the second shaft portion 1C is connected to the drive shaft 1B via a joint 2A, and the other end 1Cb is connected to one end 1Aa of the first shaft portion 1A via a constant velocity joint 3. The other end 1Ab of the first shaft portion 1A is connected to the differential gear side via a joint 2B. The joint 2B is formed, for example, by a Cardan joint, which is a universal joint.

[0017] In the following description, the direction from the second shaft portion 1C to the first shaft portion 1A along the rotation axis 100a of the propeller shaft 100 is referred to as the first direction, and the opposite direction is referred to as the second direction. The first direction is set to the direction indicated by arrow Ar1 in FIG. 1, and the second direction is set to the direction indicated by arrow Ar2 in FIG. 1.

[0018] Unless otherwise specified, the radial direction refers to the radial direction centered on the rotation axis 100a, that is, the direction perpendicular to the rotation axis 100a.

[0019] The constant velocity joint 3 constitutes a collapse section. The collapse section 3 is a structural section provided to absorb impact in the event of a vehicle collision. In the collapse section 3, a cylindrical section (outer ring member) 3a is provided at the end 1Aa of the first shaft section 1A on the second shaft section 1C side, and the end 1Cb of the second shaft section 1C on the first shaft section 1A side is inserted into the inner periphery (radially inner side) of this cylindrical section 3a. An inner ring member 3b is provided at the end 1Cb of the second shaft section 1C.

[0020] The second shaft portion 1C is configured to be slidable along the rotation axis 100a relative to the cylindrical portion 3a of the first shaft portion 1A, and in the event of a vehicle collision, the first shaft portion 1A and the second shaft portion 1C are displaced relative to each other along the rotation axis 100a to absorb the energy of the collision. At this time, the length of the propeller shaft 100 in the direction along the rotation axis 100a is shortened.

[0021] The constant velocity joint 3 has an inner ring member connected to the second shaft portion (second rotating member) 1C, an outer ring member 3a connected to the first shaft portion (first rotating member) 1A, and a ball member 3c arranged between the inner ring member 3b and the outer ring member 3a, and rotation is transmitted from the inner ring member 3b to the outer ring member 3a via the ball member.

[0022] The propeller shaft 100 is supported on the body of the vehicle by a support device 5. In this embodiment, the support device 5 is provided on the outer periphery of the first shaft member 1A. The support device 5 is included in the device of the propeller shaft (power transmission shaft) 100, and constitutes the propeller shaft 100.

[0023] FIG. 2 is an enlarged view showing the constant velocity joint 3, the boot 4, and their vicinity in partial cross section, with boot bands 5 and 6 fastened. The boot (boot member) 4 is provided between the rotating outer race member (first member) 3a and the second shaft portion (second member or second rotating member) 1C that is connected to the outer race member 3a and rotates together with the outer race member 3a. The boot 4 includes a first boot band fixing portion (first fixing portion, fixing portion) 41 that is fixed to the outer periphery of the outer race member 3a, and a second boot band fixing portion (second fixing portion, fixing portion) 42 that is fixed to the outer periphery of the second shaft portion 1C.

[0024] The first boot band fixing portion 41 has a first boot band recess (first recess, recess) 41A recessed to approach the rotation axis 100a of the outer ring member 3a. The second boot band fixing portion 42 has a second boot band recess (second recess, recess) 42A recessed to approach the rotation axis 100a of the second shaft portion 1C.

[0025] The first boot band recess 41A has a first-member-side sidewall 41a provided on the outer ring member 3a side in the direction along the rotation axis 100a, and a second-member-side sidewall 41b provided on the second shaft portion (second member) 1C side in the direction along the rotation axis 100a. The second-member-side sidewall 41b has a dimension (outer diameter) φ41b in the radial direction perpendicular to the rotation axis 100a that is larger than the dimension (outer diameter) φ41a in the radial direction of the first-member-side sidewall 41a.

[0026] The second boot band recess 42A has a first-member-side sidewall 42a provided on the side of the outer ring member 3a in the direction along the rotation axis 100a, and a second-member-side sidewall 42b provided on the side of the second shaft portion (second member) 1C in the direction along the rotation axis 100a. The second-member-side sidewall 42b has a dimension (outer diameter) φ42b in the radial direction perpendicular to the rotation axis 100a that is smaller than the dimension (outer diameter) φ42a in the radial direction of the first-member-side sidewall 42a.

[0027] When attaching the first boot band 5 to the first boot band fastening portion 41, the first boot band 5 abuts against the second-member-side sidewall 41b of the first boot band recess 41A from the first-member-side sidewall 41a side in the direction along the rotation axis 100a. When attaching the second boot band 6 to the second boot band fastening portion 42, the second boot band 6 abuts against the first-member-side sidewall 42a of the second boot band recess 42A from the second-member-side sidewall 42b side in the direction along the rotation axis 100a.

[0028] The second-member-side sidewall 41b of the first boot band recess 41A serves to position the first boot band 5 in the direction along the rotation axis 100a, ensuring close contact of the first boot band 5 with the bottom 41c of the first boot band recess 41A. The first-member-side sidewall 42a of the second boot band recess 42A serves to position the second boot band 6 in the direction along the rotation axis 100a, ensuring close contact of the second boot band 6 with the bottom 42c of the second boot band recess 42A.

[0029] FIG. 3 is an enlarged view showing the constant velocity joint 3, the boot 4, and their vicinity in partial cross section, showing the state before the boot bands 5 and 6 are fastened. The maximum inner diameter dimension φ5a1 of the first boot band 5 before being fixed to the first boot band fixing portion 41 is larger than the outer diameter dimension φ41a of the first member side wall 41a of the first boot band recess 41A and smaller than the outer diameter dimension φ41b of the second member side side wall 41b of the first boot band recess 41A.

[0030] When attached, the first boot band 5 can easily pass through the first-member-side side wall 41a of the first boot band recess 41A, but cannot climb over the second-member-side side wall 41b of the first boot band recess 41A, so that the first boot band 5 is guided to a stable position (bottom 41c) in the first boot band recess 41A.

[0031] The second boot band 6 has a maximum inner diameter dimension φ6a1 before being fixed to the second boot band fixing portion 42 that is larger than the outer diameter dimension φ42b of the second member side side wall 42b of the second boot band recess 42A and smaller than the outer diameter dimension φ42a of the first member side side wall 42a of the second boot band recess 42A.

[0032] When attached, the second boot band 6 can easily pass through the second-member-side side wall 42b of the second boot band recess 42A, but cannot climb over the first-member-side side wall 42a of the second boot band recess 42A, so that the second boot band 6 is guided to a stable position (bottom 42c) in the second boot band recess 42A.

[0033] FIG. 4 is an enlarged view showing the constant velocity joint 3, the boot 4, and their vicinity in partial cross section, illustrating a state in which the boot bands 5 and 6 are fastened. The outer diameter dimension φ41b of the second member side side wall 41b of the first boot band recess 41A is preferably equal to or smaller than the maximum outer diameter dimension φ5b2 of the first boot band 5 when fastened to the first boot band fixing portion 41. Figure 4 shows the case where φ41b = φ5b2.

[0034] The outer diameter dimension φ42a of the first member side wall 42a of the second boot band recess 42A is preferably equal to or smaller than the maximum outer diameter dimension φ6b2 of the second boot band 6 when fastened to the second boot band fixing portion 42. Figure 4 shows the case where φ42a = φ6b2.

[0035] Higher second-component-side sidewall 41b of first boot band recess 41A and higher first-component-side sidewall 42a of second boot band recess 42A improve the fit of first boot band 5 and second boot band 6. However, the tradeoff is that the increased turning radius reduces clearance with surrounding components, potentially resulting in interference with the surrounding components. Therefore, the above configuration prevents unnecessary increases in the outer diameter φ41b of second-component-side sidewall 41b of first boot band recess 41A and the outer diameter φ42a of first-component-side sidewall 42a of second boot band recess 42A, thereby minimizing the impact on the vehicle layout. In this case, because the second-component-side sidewall 41b of first boot band recess 41A has a larger diameter than the first-component-side sidewall 42a of second boot band recess 42A, the effect of preventing the second-component-side sidewall 41b of first boot band recess 41A from becoming too large is significant.

[0036] The effect of the above-described boot (boot member) 4 becomes more pronounced when the boot 4 is applied to a power transmission shaft and a propeller shaft, which will be described later.

[0037] FIG. 5 is a diagram showing an adjustable clamp having a mechanical interlock structure.

[0038] Adjustable clamps having a mechanical interlock structure can be used as the first boot band 5 and the second boot band 6. The mechanical interlock structure provides good fastening workability and can reduce work time.

[0039] Using the boot 4, a power transmission shaft can be configured as follows. This will be explained with reference to FIG.

[0040] The power transmission shaft has a first shaft portion (first rotating member) 1A, a second shaft portion (second rotating member) 1C, an inner ring member 3b connected to the second shaft portion 1C, an outer ring member 3a connected to the first shaft portion 1A, and a ball member 3c arranged between the inner ring member 3b and the outer ring member 3a, and is equipped with a constant velocity joint 3 in which rotation is transmitted from the inner ring member 3b to the outer ring member 3a via the ball member 3c, a boot 4 provided between the outer ring member 3a of the constant velocity joint 3 and the second shaft portion 1C, a first boot band 5 that fastens the boot 4, and a second boot band 6 that fastens the boot 4.

[0041] The boot 4 has a first boot band fixing portion 41 fixed to the outer periphery of the outer ring member 3a of the constant velocity joint 3 by a first boot band 5, and a second boot band fixing portion 42 fixed to the outer periphery of the second shaft portion 1C by a second boot band 6.

[0042] The first boot band fixing portion 41 includes a first boot band recess 41A recessed toward the rotation axis 100a of the first shaft portion 1A, a first rotating member side side wall 41a of the first boot band recess 41A provided on the first shaft portion (first rotating member) 1A side of the first boot band recess 41A in the direction along the rotation axis 100a, and a second rotating member side side wall 41b of the first boot band recess 41A provided on the second shaft portion (second rotating member) 1C side of the first boot band recess 41A in the direction along the rotation axis 100a.

[0043] The second rotating member side wall 41b of the first boot band recess 41A is formed so that the radial dimension φ41b perpendicular to the rotation axis 100a is larger than the radial dimension φ41a of the first rotating member side wall 41a of the first boot band recess 41A.

[0044] The second boot band fixing portion 42 includes a second boot band recess 42A recessed toward the rotation axis 100a, a first rotating member side wall 42a of the second boot band recess 42A provided on the first shaft portion 1A side of the second boot band recess 42A in the direction along the rotation axis 100a, and a second rotating member side wall 42b of the second boot band recess 42A provided on the second shaft portion 1C side of the second boot band recess 42A in the direction along the rotation axis 100a.

[0045] The second rotating member side wall 42b of the second boot band recess 42A is formed so that the radial dimension φ42b perpendicular to the rotation axis 100a is smaller than the radial dimension φ42a of the first rotating member side wall 42a of the second boot band recess 42A.

[0046] As shown in Figure 3, the maximum inner diameter dimension φ5a1 of the first boot band 5 before being fixed to the first boot band fixing portion 41 is larger than the outer diameter dimension φ41a of the first rotating member side wall 41a of the first boot band recess 41A and smaller than the outer diameter dimension φ41b of the second rotating member side wall 41b of the first boot band recess 41A.

[0047] As shown in Figure 4, the outer diameter dimension φ41b of the second rotating member side side wall 41b of the first boot band recess 41A is less than the maximum outer diameter dimension φ5b2 of the first boot band 5 when fastened to the first boot band fixing portion 41.

[0048] As shown in Figure 3, the second boot band 6 has a maximum inner diameter dimension φ6a1 before being fixed to the second boot band fixing portion 42 that is smaller than the outer diameter dimension φ42a of the first rotating member side wall 42a of the second boot band recess 42A and larger than the outer diameter dimension φ42b of the second rotating member side side wall 42b of the second boot band recess 42A.

[0049] As shown in Figure 4, the outer diameter φ42a of the first rotating member side side wall 42a of the second boot band recess 42A is less than the maximum outer diameter φ6b2 of the second boot band 6 when fastened to the second boot band fixing portion 42.

[0050] Using the boot 4, the propeller shaft 100 (see FIG. 1) can be configured as follows. This will be explained with reference to FIG.

[0051] The propeller shaft 100 comprises shaft members (first shaft portion 1A and second shaft portion 1C), boot members (boots) 4 attached to the outside of the shaft members 1A, 1C in a radial direction perpendicular to the central axis 100a of the shaft members 1A, 1C, boot band fixing portions (first boot band fixing portions, fixing portions) 41 formed on the outer surface of the boot member 4 and consisting of recesses (first boot band recesses) 41A recessed from the outside to the inside in the radial direction, and a boot band (first boot band) 5 wrapped around the boot band fixing portions 41, and transmits rotational force from the vehicle's power source to the vehicle's wheels.

[0052] Here, the boot band fixing portion may be a second boot band fixing portion (fixing portion) 42, the recess may be a second boot band recess 42A, and the boot band may be a second boot band 6.

[0053] The recess 41A has a bottom 41c, a first sidewall 41a connected to one end of the bottom 41c along the central axis 100a and extending radially outward, and a second sidewall 41b connected to the other end of the bottom 41c along the central axis 100a and extending radially outward. Here, the first sidewall 41a corresponds to the first rotating member-side sidewall 41a described above. Here, the second sidewall 41b corresponds to the second rotating member-side sidewall 41b described above.

[0054] The outer diameter dimension φ41a of the first side wall portion 41a is smaller than the inner diameter dimension φ5a1 of the boot band 5 before the boot band 5 is attached, and the outer diameter dimension φ41b of the second side wall portion 41b is larger than the inner diameter dimension φ5a1 of the boot band 5 before the boot band 5 is attached.

[0055] By applying the above-described boot member 4 to the propeller shaft 4, the workability of attaching the boot band 5 can be improved and damage to the boot member 4 caused by the boot band 5 can be eliminated or suppressed.

[0056] As shown in FIG. 4, the outer diameter dimension φ41b of the second side wall portion 41b is equal to or smaller than the maximum outer diameter dimension φ5b2 of the boot band 5 after the boot band 5 is wound around the boot band fixing portion 41.

[0057] The present invention is not limited to the above-described embodiments, and some configurations may be omitted or other configurations not described may be added. Furthermore, the configurations described in each embodiment may be combined with other embodiments to the extent that they are not inconsistent. By combining the configurations described in each embodiment with other embodiments, the effects of those configurations are also realized in the other embodiments. [Explanation of symbols]

[0058] 1A...first shaft portion (first rotating member), 1C...second shaft portion (second member or second rotating member), 1A, 1C...shaft member, 3...constant velocity joint, 3a...outer ring member (first member), 3b...inner ring member, 3c...ball member, 4...boot (boot member), 5...first boot band (boot band), 6...second boot band, 41...first boot band fixing portion (first fixing portion, fixing portion), 41A...first boot band recess (first recess, recess), 41a...first member side side wall of first boot band recess 41A (first rotating member side side wall, first side wall portion), 41b...second member side side wall of first boot band recess 41A (second rotating member side side wall, second side wall portion), 41c...bottom of first boot band recess 41A, 42 ...second boot band fixing portion (second fixing portion, fixing portion), 42A...second boot band recess (second recess, recess), 42a...first member side wall (first rotating member side wall) of second boot band recess 42A, 42b...second member side wall (second rotating member side wall) of second boot band recess 42A, 100...propeller shaft, 100a...rotation axis (central axis), φ5a1...inner diameter dimension of boot band 5 before installation, φ41a...radial dimension (outer diameter) of first member side side wall 41a, φ41b...radial dimension (outer diameter) of second member side side wall 41b, φ42a...radial dimension (outer diameter) of first member side side wall 42a, φ42b...radial dimension (outer diameter) of second member side side wall 42b.

Claims

1. A boot is provided across a rotating first member and a second member connected to the first member and rotating together with the first member, a first fixing portion fixed to an outer periphery of the first member; a second fixing portion fixed to an outer periphery of the second member; Equipped with the first fixing portion is recessed so as to approach the rotation axis of the first member and has a first recess to which a first boot band is fastened; the first recess has a first-member-side sidewall provided on the first member side in the direction along the rotation axis, and a second-member-side sidewall provided on the second member side in the direction along the rotation axis, The boot is configured such that the dimension of the second member side wall in a radial direction perpendicular to the rotation axis is larger than the dimension of the first member side wall in the radial direction.

2. The boot of claim 1, The first boot band is a boot whose maximum inner diameter before being fastened to the first fixing portion is larger than the outer diameter of the side wall of the first recess on the side of the first member and smaller than the outer diameter of the side wall of the first recess on the side of the second member.

3. The boot of claim 1, A boot in which the outer diameter of the side wall of the first recess on the second member side is equal to or smaller than the maximum outer diameter of the first boot band when fastened to the first fixing portion.

4. The boot according to any one of claims 1 to 3, The first boot band is an adjustable clamp boot having a mechanical interlock structure.

5. a first rotating member; A second rotating member; a constant velocity joint including an inner ring member connected to the second rotating member, an outer ring member connected to the first rotating member, and a ball member disposed between the inner ring member and the outer ring member, wherein rotation is transmitted from the inner ring member to the outer ring member via the ball member; a boot provided between the outer ring member and the second rotating member of the constant velocity joint; a first boot band for fastening the boot; a second boot band for fastening the boot; Equipped with The boots are a first fixing portion fixed to an outer periphery of the outer ring member of the constant velocity joint by the first boot band; a second fixing portion fixed to the outer periphery of the second rotating member by the second boot band; and The first fixing portion is a first recess recessed toward the rotation axis of the first rotary member; a first rotating member side wall of the first recess provided on the first rotating member side of the first recess in a direction along the rotation axis; a second rotating member-side sidewall of the first recess provided on the second rotating member side of the first recess in a direction along the rotation axis, a side wall of the first recessed portion adjacent to the second rotating member has a dimension in a radial direction perpendicular to the rotation axis that is larger than a dimension in the radial direction of the side wall of the first recessed portion adjacent to the first rotating member, The second fixing portion is a second recess recessed toward the rotation axis; a first rotating member side wall of the second recess provided on the first rotating member side of the second recess in a direction along the rotation axis; a second rotating member-side sidewall of the second recess provided on the second rotating member side of the second recess in a direction along the rotation axis, A power transmission shaft in which the radial dimension of the second rotating member side wall of the second recess is smaller than the radial dimension of the first rotating member side wall of the second recess perpendicular to the rotation axis.

6. The power transmission shaft of claim 5, The first boot band is a power transmission shaft whose maximum inner diameter before being fixed to the first fixing portion is larger than the outer diameter of the side wall of the first recess facing the first rotating member and smaller than the outer diameter of the side wall of the first recess facing the second rotating member.

7. The power transmission shaft of claim 5, A power transmission shaft in which the outer diameter of the side wall of the first recess facing the second rotating member is equal to or smaller than the maximum outer diameter of the first boot band when fastened to the first fixing portion.

8. The power transmission shaft of claim 5, A power transmission shaft in which the maximum inner diameter of the second boot band before being fixed to the second fixing portion is smaller than the outer diameter of the side wall of the second recess facing the first rotating member and is larger than the outer diameter of the side wall of the second recess facing the second rotating member.

9. The power transmission shaft of claim 8, A power transmission shaft in which the outer diameter dimension of the side wall of the second recess facing the first rotating member is equal to or smaller than the maximum outer diameter dimension of the second boot band when fastened to the second fixing portion.

10. A propeller shaft that transmits rotational force from a power source of a vehicle to wheels of the vehicle, A shaft member; a boot member attached to the outside of the shaft member in a radial direction perpendicular to the central axis of the shaft member; a fixing portion formed on an outer peripheral surface of the boot member and having a recess recessed from the outside toward the inside in the radial direction; a boot band wound around the fixing portion, the recess has a bottom, a first side wall connected to one end of the bottom in a direction along the central axis and extending radially outward, and a second side wall connected to the other end of the bottom in a direction along the central axis and extending radially outward, an outer diameter of the first side wall portion is smaller than an inner diameter of the boot band before the boot band is attached; A propeller shaft in which the outer diameter of the second side wall portion is larger than the inner diameter of the boot band before the boot band is attached.

11. The propeller shaft of claim 10, A propeller shaft in which the outer diameter of the second side wall portion is equal to or smaller than the maximum outer diameter of the boot band after the boot band is wound around the fixing portion.

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