JP2017154568A - Wheel structure, and method for producing wheel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel structure and a method for producing the wheel structure, wherein, high rigidity is secured while preventing weight increase.SOLUTION: A wheel structure 40 comprises a brake drum 46, and further comprises an annular storage member 43 that stores the brake drum 46. The brake drum 46 comprises a press-fit part 47 that is press-fitted into the inner peripheral side of the storage member 43.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wheel structure and a method for manufacturing the wheel structure.

  Conventional wheel structures include those disclosed in Patent Document 1, for example. In this case, the shaft hole of the brake drum is fitted to the outer peripheral surface of the hub, and the hub and the brake drum are welded and joined at the fitting portion.

Japanese Patent Laid-Open No. 11-348502

  By the way, when high braking force is required, the wheel is also required to have high rigidity. In this case, in Patent Document 1, there is a method of increasing the thickness of the brake drum, but there is a possibility of causing an increase in weight.

  Accordingly, an object of the present invention is to ensure high rigidity while suppressing an increase in weight in a wheel structure and a method for manufacturing the wheel structure.

As a means for solving the above problems, the invention described in claim 1 is an annular storage member for storing the brake drum (36, 46) in a wheel structure (30, 40) including the brake drum (36, 46). (33, 43), and the brake drum (36, 46) includes a press-fit portion (37, 47) that is press-fitted to the inner peripheral side of the storage member (33, 43). To do.
The invention described in claim 2 is characterized in that the brake drum (36, 46) is a cast product.
The invention described in claim 3 further includes a spoke (35, 45) joined to an outer periphery of the storage member (33, 43), and the storage member (33, 43) and the spoke (35, 45) Between the storage member (33, 43) and the spoke (35, 46) so as to overlap the brake drum (36, 46) in a direction along the axis (CR, CF) of the storage member (33, 43). 45) is provided with joint portions (38, 48).
The invention described in claim 4 further includes a fixing member (39, 49) for fixing the storage member (33, 43) and the brake drum (36, 46).
In the invention according to claim 5, the storage member (43) is provided with a storage port portion (43k) that forms a storage port (43h) of the brake drum (46), and the storage port portion (43k). Is formed with a stepped portion (43m) extending radially outward, and the storage member (43) has an annular bottom wall (43b) that covers the brake drum (46) from the side opposite to the storage port (43h). ), And the bottom wall (43b) extends from the radially outer end of the base portion (43c) to the opposite side of the storage port (43h). And a convex portion (43e) extending so as to form a convex shape.
According to a sixth aspect of the present invention, in a method for manufacturing a wheel structure (30, 40) including a brake drum (36, 46), an annular storage member (33, 43) for storing the brake drum (36, 46). ), And the brake drum (36, 46) is press-fitted and coupled to the inner peripheral side of the storage member (33, 43).

According to the first aspect of the present invention, since the brake drum includes the press-fitting portion that is press-fitted to the inner peripheral side of the storage member, the brake drum and the storage member have a double structure that is press-fitted and connected. High rigidity can be secured while suppressing the increase.
According to the second aspect of the present invention, since the brake drum is a cast product, the friction coefficient is higher than that of the press product, so that a high braking force can be obtained. Moreover, since the brake drum, which is a cast product, includes the press-fit portion, it can be easily combined as compared with the case where welding is performed.
According to the invention described in claim 3, the joint portion for joining the storage member and the spoke is provided between the storage member and the spoke so as to overlap the brake drum in a direction along the axis of the storage member. Thus, when the brake drum is press-fitted into the inner peripheral side of the storage member, the pressure generated on the inner peripheral side of the storage member can be received by the joint portion. Therefore, it is possible to sufficiently ensure the pressure input between the brake drum and the storage member.
According to the fourth aspect of the present invention, the fixing member can be functioned in an auxiliary manner by further including the fixing member that fixes the storage member and the brake drum. For example, the storage member and the brake drum can be prevented from shifting due to dimensional tolerance of the wheel structure, thermal expansion, and the like.
According to the fifth aspect of the present invention, the storage port portion is formed with the stepped portion that extends radially outward, so that the brake drum can be easily stored in the storage member. Further, the bottom wall includes a base portion extending along the radial direction, and a convex portion extending so as to protrude from the radial outer end of the base portion toward the side opposite to the storage port. Since the brake drum can be stored to the back of the storage member, a press-fitting allowance between the brake drum and the storage member can be sufficiently ensured. Moreover, the rigidity of the wheel can be improved in a balanced manner by providing a stepped portion on one side of the storage member and a convex portion on the other side.
According to the invention described in claim 6, since the brake drum and the storage member are press-fitted and coupled to the inner peripheral side of the storage member, a double structure in which the brake drum and the storage member are press-coupled is obtained. Rigidity can be ensured.

1 is a right side view of a motorcycle in an embodiment of the present invention. It is a figure containing the II-II cross section of FIG. It is a figure containing the III-III cross section of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle described below unless otherwise specified. Further, in the drawings used for the following description, an arrow FR indicating the front of the vehicle, an arrow LH indicating the left side of the vehicle, and an arrow UP indicating the upper side of the vehicle are shown.

<Whole vehicle>
FIG. 1 shows a scooter-type motorcycle 1 as an example of a saddle-ride type vehicle. Referring to FIG. 1, the motorcycle 1 includes a front wheel WF steered by a handle 18 and a rear wheel WR driven by a power unit P including an engine E. Hereinafter, the motorcycle may be simply referred to as “vehicle”.

  The motorcycle 1 includes a footrest portion 3 below the front portion of the occupant seat 2. The motorcycle 1 includes a vehicle body frame F formed by integrally joining a plurality of types of steel materials by welding or the like.

  The vehicle body frame F has a main frame pipe 12 to which the head pipe 11 is coupled at the front end, a cross pipe 13 that is coupled orthogonally to the rear end of the main frame pipe 12, and front ends at the left and right ends of the cross pipe 13. And a pair of left and right rear frame pipes 14 that are coupled to each other and extend rearwardly from the coupling portion with the cross pipe 13.

  The main frame pipe 12 includes a down frame portion 12a inclined rearward and downward from the head pipe 11, and a lower frame portion 12b extending rearward substantially horizontally from the rear end of the down frame portion 12a.

  A front fork 17 is supported on the head pipe 11 so as to be rotatable. The front fork 17 includes a pair of left and right legs 15 disposed on both sides of the front wheel WF, and a bridge member 16 that connects the upper ends of these legs 15. A front wheel WF is rotatably supported between the lower ends of the left and right leg portions 15. A bar-type handle 18 is coupled to the upper end of the front fork 17.

  A front part of a unit swing type power unit P is supported on the cross pipe 13 via a link 19 so as to be swingable up and down. The power unit P includes an engine E arranged on the front side of the rear wheel WR and a belt type continuously variable transmission M (see FIG. 2) arranged on the left side of the rear wheel WR. The rear wheel WR is attached to a rear wheel axle 20 that protrudes rightward from the rear portion of the power unit P. Although not shown, a cushion unit is interposed between the left rear frame pipe 14 and the rear portion of the power unit P.

  An air cleaner 21 is connected to the intake side of the cylinder head of the engine E via an intake pipe (not shown). An exhaust muffler 22 is connected to the exhaust side of the cylinder head of the engine E via an exhaust pipe 28. The exhaust muffler 22 extends from the rear lower position on the right side of the engine E to the rear side of the vehicle body through the right side of the rear axle 20 of the rear wheel WR.

  A fuel tank 27 is attached to the upper front side of the left and right rear frame pipes 14. An occupant seat 2 is supported on the upper portion of the fuel tank 27. On the rear side of the left and right rear frame pipes 14 where the fuel tank 27 is installed, a carrier 29 for mounting articles is mounted on the upper part. Reference numeral 5 in FIG. 1 denotes a synthetic resin vehicle body cover that covers the outside of the vehicle body frame such as the vehicle body frame F.

  As shown in FIG. 2, the rear wheel axle 20 of the rear wheel WR is provided at the power output portion of the belt type continuously variable transmission M. The power of the engine E is transmitted to the rear wheel axle 20 through the transmission unit of the belt type continuously variable transmission M and the speed reduction mechanism 23. The tire 24 of the rear wheel WR is held on the outer peripheral portion of the rear wheel 31. A work space 50 is secured between the rear wheel axle 20 and the exhaust muffler 22 for attaching and detaching the rear wheel WR (rear wheel 31) to the rear wheel axle 20. In addition, the code | symbol D (two-dot chain line part) in FIG. 2 shows the transmission case which accommodates the belt-type continuously variable transmission M. FIG.

As shown in FIGS. 1 to 3, the motorcycle 1 includes a rear wheel structure 30 and a front wheel structure 40.
In the following description, the rear wheel structure 30 and the front wheel structure 40 are the “wheel structure” recited in the claims, and the rear brake drum 36 and the front brake drum 46 are the “brake drum” recited in the claims, the rear wheel side storage member 33 and the front wheel side storage member 43 correspond to the “storage member” recited in the claims, and the rear spoke 35 and the front spoke 45 correspond to the “spoke” recited in the claims.

  In the following description, the rear wheel structure 30 and the front wheel structure 40 are simply “wheel structures 30 and 40”, the rear brake drum 36 and the front brake drum 46 are simply “brake drums 36 and 46”, and the rear wheel side storage member. 33 and the front wheel side storage member 43 are simply “storage members 33 and 43”, the rear wheel rim 34 and the front wheel rim 44 are simply “wheel rims 34 and 44”, the rear spokes 35 and the front spoke 45 are simply “spokes 35, 45 ".

<Rear wheel structure>
As shown in FIG. 2, the rear wheel structure 30 includes a rear wheel 31 and a rear brake drum 36.

<Rear wheel>
The rear wheel 31 includes a rear wheel boss 32 having a shaft hole 32 h attached to the rear wheel axle 20, and an annular rear wheel side housing member in which the rear wheel boss 32 is coupled to the shaft center portion and houses the rear brake drum 36. 33, an annular rear wheel rim 34 that holds the tire 24 on the outer periphery, and a rear spoke 35 that connects the rear wheel side storage member 33 and the rear wheel rim 34.

  The rear wheel boss 32, the rear wheel side storage member 33, the rear wheel rim 34, and the rear spoke 35 are made of metal such as iron. The rear wheel boss 32, the rear wheel side storage member 33, the rear wheel rim 34, and the rear spoke 35 are integrated by welding together. Hereinafter, the rotation axis CR of the rear wheel WR is referred to as “rear wheel rotation axis CR”. The rear wheel rotation axis CR is the central axis of the rear wheel axle 20, and corresponds to the axis of the rear wheel side storage member 33 (the axis of the storage member).

  The rear wheel boss 32 is formed on a cylindrical rear wheel boss main body 32a along the rear wheel rotation axis CR, and is formed on one end side (right end side) of the rear wheel boss main body 32a. And a rear wheel boss enlarged diameter portion 32b having a tapered shape. Here, one end side of the rear wheel boss 32 is a side close to the exhaust muffler 22 when the rear wheel 31 is attached to the vehicle. The other end side of the rear wheel boss 32 is a side close to the continuously variable transmission M (transmission case D) when the rear wheel 31 is attached to the vehicle.

  Although not shown, the rear wheel axle 20 and the rear wheel boss 32 (formation portion of the shaft center hole 32h) have a rotation prevention mechanism such as a spline for restricting the relative rotation of the rear wheel axle 20 and the rear wheel boss 32. Is provided.

  The rear wheel side storage member 33 is provided with a storage port portion 33k that forms a storage port 33h of the rear brake drum 36. The rear wheel side storage member 33 has a cylindrical inner peripheral wall 33a whose inner peripheral surface abuts on the outer peripheral surface of the rear wheel boss 32, a cylindrical shape having a larger diameter than the inner peripheral wall 33a, and the rear brake drum 36 in the radial direction. A cylindrical outer peripheral wall 33b that covers from the outside, an annular base wall 33c that covers the rear brake drum 36 from the side opposite to the storage port 33h, and a radially outer side from one end (right end) of the inner peripheral wall 33a to the outer side in the axial direction. An inclined wall 33d extending in an inclined manner and continuing to the radially inner end of the base wall 33c.

  The length of the inner peripheral wall 33a is shorter than the length of the rear wheel boss 32 in the direction along the rear wheel rotation axis CR. The left end of the inner peripheral wall 33 a is located slightly to the left of the longitudinal center of the rear wheel boss 32. The rear wheel side storage member 33 is welded to the outer peripheral surface of the rear wheel boss 32 at the left end of the inner peripheral wall 33a and the inclined wall 33d.

  In the direction along the rear wheel rotation axis CR, the length of the outer peripheral wall 33b is longer than the length of the inner peripheral wall 33a. The right end of the outer peripheral wall 33 b is located on the right side of the right end of the rear wheel boss 32. The left end of the outer peripheral wall 33b is disposed at a position that substantially overlaps the left end of the inner peripheral wall 33a in the radial direction. The inner peripheral portion of the rear spoke 35 is bent and welded to the outer peripheral surfaces of the left and middle portions of the outer peripheral wall 33b.

  The base wall 33c is formed with a plurality of (for example, three in this embodiment) outer through-holes 33i that penetrate the base wall 33c in the thickness direction. The outer through hole 33i has a circular shape when viewed from the direction along the rear wheel rotation axis CR. The outer through holes 33i are arranged at substantially the same interval in the circumferential direction of the base wall 33c.

  A rear wheel boss enlarged diameter portion 32b is welded to the outer peripheral surface (radial inner surface) of the inclined wall 33d. The inclined wall 33d extends from the one end (right end) of the inner peripheral wall 33a so as to incline radially outward from the one end (right end) in the axial direction, and the rear wheel boss enlarged diameter portion 32b extends to one end (right end) of the rear wheel boss main body 32a. The rear wheel boss 32 and the rear wheel side storage member 33 are positioned in the direction along the rear wheel rotation axis CR. Can do.

  The rear spoke 35 has a cylindrical inner wall portion 35 a in which the inner peripheral surface abuts on the outer peripheral surface of the rear wheel side storage member 33, and is positioned radially outward from the inner wall portion 35 a and the inner peripheral surface of the rear wheel rim 34. A cylindrical outer wall portion 35b with which the outer peripheral surface abuts, and a connecting wall portion 35c extending obliquely from the right end of the inner wall portion 35a so as to be positioned inward in the vehicle width direction and continuing to the right end of the outer wall portion 35b. And.

  Between the rear wheel side storage member 33 and the rear spoke 35, a joint portion 38 that joins the rear wheel side storage member 33 and the rear spoke 35 so as to overlap the rear brake drum 36 in a direction along the rear wheel rotation axis CR. Is provided. The joint portion 38 corresponds to a portion where the outer peripheral wall 33b of the rear wheel side storage member 33 and the inner wall portion 35a of the rear spoke 35 overlap in the radial direction.

<Rear brake drum>
The rear brake drum 36 includes a cylindrical cylindrical wall portion 36a whose outer peripheral surface abuts on the inner peripheral surface of the outer peripheral wall 33b of the rear wheel side storage member 33, and a base wall of the storage member from the right end of the cylindrical wall portion 36a. An annular wall portion 36b that extends radially inward along 33c and forms an annular shape that contacts the inclined wall 33d of the rear wheel side storage member 33. The rear brake drum 36 is a cast product. For example, the rear brake drum 36 is made of cast iron. The rear brake drum 36 constitutes a part of a drum-type brake device (not shown) for the rear wheel WR.

  The rear brake drum 36 includes a press-fitting portion 37 that is press-fitted to the inner peripheral side of the rear wheel side storage member 33. The press-fit portion 37 is a portion of the rear brake drum 36 that comes into contact with the outer peripheral wall 33b of the rear wheel side storage member 33 from the radially inner side. That is, the outer peripheral surface forming portion (radially outer portion) of the cylindrical wall portion 36a corresponds to the press-fit portion 37 in the rear brake drum 36.

  A plurality of (for example, three in this embodiment) inner through holes 36h that penetrate the annular wall 36b in the thickness direction are formed in the annular wall 36b. The inner through hole 36h has a circular shape when viewed from the direction along the rear wheel rotation axis CR. The inner through holes 36h are disposed at substantially the same interval in the circumferential direction of the annular wall portion 36b. When the rear brake drum 36 is press-fitted into the inner peripheral side of the rear wheel side housing member 33, the inner through hole 36h overlaps (that is, communicates) with the outer through hole 33i in the direction along the rear wheel rotation axis CR.

  A flange portion 36c is formed at the left end portion of the cylindrical wall portion 36a. The flange portion 36c is in contact with the left end (storage port portion 33k) of the outer peripheral wall 33b of the rear wheel side storage member 33. When viewed from the direction along the rear wheel rotation axis CR, the outer shape of the flange portion 36 c is slightly larger than the outer shape of the outer peripheral wall 33 b of the rear wheel side storage member 33.

<Fixing member>
The rear wheel structure 30 further includes a fixing member 39 that fixes the rear wheel side storage member 33 and the rear brake drum 36. For example, the fixing member 39 is a rivet. The fixing member 39 is connected to the base wall 33c of the rear wheel side storage member 33 via the outer through hole 33i of the base wall 33c of the rear wheel side storage member 33 and the inner through hole 36h of the annular wall portion 36b of the rear brake drum 36. And the annular wall portion 36b of the rear brake drum 36 are fixed. When viewed from the direction along the rear wheel rotation axis CR, a plurality (for example, three in this embodiment) of the fixing members 39 are arranged at positions overlapping the outer through holes 33i and the inner through holes 36h (see FIG. 1).

<Front wheel structure>
As shown in FIG. 3, the front wheel structure 40 includes a front wheel 41 and a front brake drum 46.

<Front wheel>
The front wheel 41 includes a cylindrical front wheel boss 42 having a shaft center hole 42h attached to the front wheel axle 40a (two-dot chain line portion), and the front wheel boss 42 is coupled to the shaft center portion and houses the front brake drum 46. An annular front wheel side storage member 43, an annular front wheel rim 44 that holds a tire (not shown) at the outer periphery, and a front spoke 45 that connects the front wheel side storage member 43 and the front wheel rim 44. It is equipped with.

  The front wheel boss 42, the front wheel side storage member 43, the front wheel rim 44, and the front spoke 45 are made of metal such as iron. The front wheel boss 42, the front wheel side storage member 43, the front wheel rim 44, and the front spoke 45 are integrated by welding together. Hereinafter, the rotation axis CF of the front wheel WF is referred to as “front wheel rotation axis CF”. The front wheel rotation axis CF is the center axis of the front wheel axle 40a and corresponds to the axis of the front wheel side storage member 43 (the axis of the storage member).

  The front wheel side storage member 43 is provided with a storage port portion 43k that forms a storage port 43h of the front brake drum 46. The front wheel side storage member 43 includes a cylindrical peripheral wall 43a that covers the front brake drum 46 from the outside in the radial direction, a front brake drum 46 that covers the front brake drum 46 from the side opposite to the storage port 43h, and an inner peripheral edge on the outer peripheral surface of the front wheel boss 42. And a bottom wall 43b having an annular shape with which the abuts.

  The length of the peripheral wall 43a is shorter than the length of the front wheel boss 42 in the direction along the front wheel rotation axis CF. The right end of the peripheral wall 43a is located slightly to the right of the longitudinal center of the front wheel boss 42. The left end of the peripheral wall 43a is disposed at a position substantially overlapping with the left end of the front wheel boss 42 in the radial direction. The inner peripheral portion of the front spoke 45 is welded to the outer peripheral surface of the right side portion of the peripheral wall 43a.

  The storage opening 43k is formed with a stepped portion 43m extending outward in the radial direction. The stepped portion 43m is located on the left end side of the peripheral wall 43a in the front wheel side storage member 43. In the cross-sectional view of FIG. 3, the stepped portion 43m is curved so as to smoothly connect the central portion in the longitudinal direction of the peripheral wall 43a and the storage port portion 43k.

  The peripheral wall 43a is provided with a convex portion 43e extending toward the opposite side to the storage port 43h along the peripheral wall 43a. The convex portion 43 e is located on the right end side of the peripheral wall 43 a in the front wheel side storage member 43.

  The bottom wall 43b includes a base portion 43c that extends along the radial direction, and a connecting portion that extends from the radial outer end of the base portion 43c toward the opposite side of the storage port 43h so as to be convex and continues to the convex portion 43e. 43d.

  The base portion 43 c is formed with an inner peripheral edge portion 43 f that is inclined so as to be located in the center in the vehicle width direction as it extends radially inward and extends along the outer peripheral surface of the front wheel boss 42. The inner peripheral edge 43f is welded to the outer peripheral surface of the front wheel boss 42.

  In the base portion 43c, a plurality of (for example, three in this embodiment) outer through-holes 43i penetrating the base portion 43c in the thickness direction are formed. The outer through-hole 43i has a circular shape when viewed from the direction along the front wheel rotation axis CF. The outer through holes 43i are arranged at substantially the same interval in the circumferential direction of the base portion 43c.

  The front spoke 45 has a cylindrical inner wall portion 45 a that is in contact with the outer peripheral surface of the front wheel side storage member 43, and an inner peripheral surface of the front wheel rim 44 that is positioned radially outward from the inner wall portion 45 a. A cylindrical outer wall portion 45b with which the outer peripheral surface abuts, and a connecting wall portion 45c extending obliquely from the right end of the inner wall portion 45a so as to be positioned inward in the vehicle width direction and continuing to the right end of the outer wall portion 45b. And.

  Between the front wheel side storage member 43 and the front spoke 45, there is a joint portion 48 that joins the front wheel side storage member 43 and the front spoke 45 so as to overlap the front brake drum 46 in the direction along the front wheel rotation axis CF. Is provided. The joint portion 48 corresponds to a portion where the peripheral wall 43a of the front wheel side storage member 43 and the inner wall portion 45a of the front spoke 45 overlap in the radial direction.

<Front brake drum>
The front brake drum 46 includes a cylindrical wall portion 46a having a cylindrical shape whose outer peripheral surface abuts on an inner peripheral surface of the peripheral wall 43a of the front wheel side storage member 43, and a front wheel side storage member 43 from the right end of the cylindrical wall portion 46a. And an annular wall portion 46b that extends inward in the radial direction along the base portion 43c and contacts the inner peripheral edge portion 43f of the front wheel side storage member 43. The front brake drum 46 is a cast product. For example, the front brake drum 46 is made of cast iron. The front brake drum 46 constitutes a part of a drum-type brake device (not shown) of the front wheel WF (see FIG. 1).

  The front brake drum 46 includes a press-fitting portion 47 that is press-fitted to the inner peripheral side of the front wheel side storage member 43. The press-fit portion 47 is a portion of the front brake drum 46 that comes into contact with the peripheral wall 43a of the front wheel side storage member 43 from the radially inner side. That is, the outer peripheral surface forming portion (radially outer portion) of the cylindrical wall portion 46 a corresponds to the press-fit portion 47 in the front brake drum 46.

  A plurality of (for example, three in this embodiment) inner through-holes 46h are formed in the annular wall 46b so as to penetrate the annular wall 46b in the thickness direction. The inner through hole 46h has a circular shape when viewed from the direction along the front wheel rotation axis CF. The inner through holes 46h are arranged at substantially the same interval in the circumferential direction of the annular wall portion 46b. When the front brake drum 46 is press-fitted into the inner peripheral side of the front wheel side storage member 43, the inner through hole 46h overlaps (that is, communicates) with the outer through hole 43i in the direction along the front wheel rotation axis CF. A gap 43s is formed between the annular wall portion 46b and the connecting portion 43d.

  A flange 46c that extends radially outward is formed at the left end of the cylindrical wall 46a. The flange portion 46c is in contact with the stepped portion 43m (storage port portion 43k) of the front wheel side storage member 43 from the inside in the radial direction. When viewed from the direction along the front wheel rotation axis CF, the outer shape of the flange portion 46 c is substantially the same as the inner shape of the storage port portion 43 k of the front wheel side storage member 43. A gap 46s is formed between the flange portion 46c and the step portion 43m.

<Fixing member>
The front wheel structure 40 further includes a fixing member 49 that fixes the front wheel side storage member 43 and the front brake drum 46. For example, the fixing member 49 is a rivet. The fixing member 49 is connected to the base portion 43c of the front wheel side storage member 43 via the outer through hole 43i of the base portion 43c of the front wheel side storage member 43 and the inner through hole 46h of the annular wall portion 46b of the front brake drum 46. And the annular wall 46b of the front brake drum 46 are fixed. When viewed from the direction along the front wheel rotation axis CF, a plurality (for example, three in the present embodiment) of the fixing members 49 are arranged at positions overlapping the outer through holes 43i and the inner through holes 46h (see FIG. 1).

<Manufacturing method of wheel structure>
Hereinafter, an example of the manufacturing method of the wheel structures 30 and 40 will be described.
As shown in FIGS. 2 and 3, first, the brake drums 36 and 46 are formed in advance by casting. Further, the wheel bosses 32 and 42, the storage members 33 and 43, the wheel rims 34 and 44, and the spokes 35 and 45 are welded together in advance.

  Next, the brake drums 36 and 46 are press-fitted into the inner peripheral sides of the storage members 33 and 43 from the storage ports 33h and 43h. As a result, the brake drums 36 and 46 are press-fitted and coupled to the inner peripheral sides of the storage members 33 and 43. Here, when the brake drums 36 and 46 are press-fitted into the inner peripheral side of the storage members 33 and 43, the pressure generated on the inner peripheral side of the storage members 33 and 43 can be received by the joint portions 38 and 48.

  The storage members 33 and 43 and the brake drums 36 and 46 are fixed by the fixing members 39 and 49. Through the above steps, the wheel structures 30 and 40 according to the embodiment can be obtained.

As described above, the embodiment further includes the annular storage members 33 and 43 for storing the brake drums 36 and 46 in the wheel structures 30 and 40 including the brake drums 36 and 46, and the brake drums 36 and 46. Includes press-fitting portions 37 and 47 that are press-fitted on the inner peripheral side of the storage members 33 and 43.
According to this configuration, the brake drums 36 and 46 include the press-fit portions 37 and 47 that are press-fitted into the inner peripheral side of the storage members 33 and 43, so that the brake drums 36 and 46 and the storage members 33 and 43 are press-fit Due to the combined double structure, high rigidity can be ensured while suppressing an increase in weight.

  Moreover, in the said embodiment, since the brake drums 36 and 46 are castings, since a friction coefficient is high compared with a press product, a high braking force can be obtained. Moreover, since the brake drums 36 and 46 which are castings are provided with the press-fitting portions 37 and 47, the brake drums 36 and 46 can be easily combined as compared with the case where welding is performed.

  Moreover, in the said embodiment, between the storage members 33 and 43 and the spokes 35 and 45, the storage member 33, overlaps with the brake drums 36, 46 in the direction along the axes CR, CF of the storage members 33, 43. Since the joint portions 38 and 48 for joining 43 and the spokes 35 and 45 are provided, when the brake drums 36 and 46 are press-fitted into the inner peripheral side of the storage members 33 and 43, The pressure generated on the inner peripheral side can be received by the joint portions 38 and 48. Therefore, a sufficient pressure input between the brake drums 36 and 46 and the storage members 33 and 43 can be ensured.

  Moreover, in the said embodiment, the fixing members 39 and 49 which fix the storage members 33 and 43 and the brake drums 36 and 46 are further provided, The fixing members 39 and 49 can be functioned auxiliary. For example, the storage members 33 and 43 and the brake drums 36 and 46 can be prevented from shifting due to dimensional tolerances, thermal expansion, and the like of the wheel structures 30 and 40.

  In the above-described embodiment, the storage opening 43k is formed with the stepped portion 43m extending outward in the radial direction, so that the brake drum 46 can be easily stored in the storage member 43. The bottom wall 43b includes a base portion 43c extending along the radial direction, and a convex portion 43e extending so as to protrude from the radial outer end of the base portion 43c toward the side opposite to the storage port 43h. Since the brake drum 46 can be housed in the interior of the housing member 43 by being provided, a press-fitting allowance between the brake drum 46 and the housing member 43 can be sufficiently secured. Further, by providing the stepped portion 43m on one side of the storage member 43 and the convex portion 43e on the other side, the rigidity of the wheel can be improved in a balanced manner.

  In the above-described embodiment, the peripheral wall 43a is provided with the convex portion 43e extending toward the opposite side of the storage port 43h along the peripheral wall 43a, so that the front and rear wheel diameters (that is, the front wheel 41) are provided. , And the diameter of the rear wheel 31) are the same, the front and rear spokes 35, 45 can be shared.

  In the above embodiment, the brake drums 36 and 46 are press-fitted and coupled to the inner peripheral sides of the storage members 33 and 43, so that the brake drums 36 and 46 and the storage members 33 and 43 are press-fitted and coupled. High rigidity can be ensured while suppressing an increase in weight.

  In the above embodiment, an example in which the front brake drum 46 includes the press-fit portion 47 and the rear brake drum 36 includes the press-fit portion 37 has been described. However, the present invention is not limited thereto. For example, only the front brake drum 46 may include the press-fit portion 47, or only the rear brake drum 36 may include the press-fit portion 37. That is, it is sufficient that at least one of the front brake drum 46 and the rear brake drum 36 includes a press-fit portion.

  In the above-described embodiment, the fixing members 39 and 49 are described as examples of rivets. However, the present invention is not limited to this. For example, the fixing members 39 and 49 may be fastening members such as bolts and nuts.

Note that the present invention is not limited to the above-described embodiment. For example, the saddle-ride type vehicle includes all vehicles on which a driver rides across a vehicle body, and includes motorcycles (motorbikes and scooter type vehicles). As well as three-wheeled vehicles (including one front wheel and two rear wheels as well as two front wheels and one rear wheel vehicle). Further, the present invention is applicable not only to motorcycles but also to four-wheeled vehicles such as automobiles.
The engine E according to the embodiment is not limited to a so-called horizontal engine having a crankshaft along the vehicle width direction, but may be a so-called vertical engine having a crankshaft along the vehicle longitudinal direction. Furthermore, the power unit P may include an electric motor as a drive source.
The configuration in the above embodiment is an example of the present invention, and various modifications can be made without departing from the gist of the present invention, such as replacing the component of the embodiment with a known component.

30 Rear wheel structure (wheel structure)
33 Rear wheel side storage member (storage member)
33h, 43h Storage port 33k, 43k Storage port 35 Rear spoke (spoke)
36 Rear brake drum
37, 47 Press-fit portion 38, 48 Joint portion 39, 49 Fixing member 40 Front wheel structure (wheel structure)
43 Front wheel side storage member (storage member)
43b Bottom wall 43c Base part 43e Convex part 43m Step part 45 Front spoke (spoke)
46 Front brake drum (brake drum)
CF Front wheel rotation axis (axis)
CR Rear wheel rotation axis (axis)

Claims (6)

In the wheel structure (30, 40) provided with the brake drum (36, 46),
An annular storage member (33, 43) for storing the brake drum (36, 46);
The wheel structure, wherein the brake drum (36, 46) includes a press-fitting portion (37, 47) press-fitted to the inner peripheral side of the storage member (33, 43).   The wheel structure according to claim 1, wherein the brake drum (36, 46) is a cast product. The spoke (35, 45) further joined to the outer periphery of the storage member (33, 43),
Between the storage member (33, 43) and the spoke (35, 45), the brake drum (36, 46) and the brake drum (36, 46) in a direction along the axis (CR, CF) of the storage member (33, 43). 3. The wheel structure according to claim 1, wherein joint portions (38, 48) for joining the storage members (33, 43) and the spokes (35, 45) are provided so as to overlap each other. .   The fixing member (39, 49) for fixing the storage member (33, 43) and the brake drum (36, 46) is further provided, according to any one of claims 1 to 3. Wheel structure. The storage member (43) is provided with a storage port portion (43k) that forms a storage port (43h) of the brake drum (46),
The storage opening (43k) is formed with a step (43m) extending outward in the radial direction,
The storage member (43) includes an annular bottom wall (43b) that covers the brake drum (46) from the side opposite to the storage port (43h),
The bottom wall (43b) has a base portion (43c) extending along the radial direction and a convex portion from the radial outer end of the base portion (43c) toward the side opposite to the storage port (43h). The wheel structure according to any one of claims 1 to 4, further comprising a convex portion (43e) extending in a manner as described above. In the manufacturing method of the wheel structure (30, 40) provided with the brake drum (36, 46),
An annular storage member (33, 43) for storing the brake drum (36, 46);
A method for manufacturing a wheel structure, wherein the brake drum (36, 46) is press-fitted and coupled to the inner peripheral side of the storage member (33, 43).

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