JP2006088716A - Wheel for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce weight of a wheel for a vehicle provided in a rim by a pair of annular bead seats to seat a bead of an inner periphery of a tire in a fitting state of the tire and an annular dropping-down recessed part recessed to an inward side along a radial direction of the tire from both of the bead seats capable of dropping the bead at the time of assembling the tire. <P>SOLUTION: An annular thinning recessed part 42 recessed inward from a bottom part of the dropping-down recessed part 41 is provided so that an annular dropping-down surface 43 formed at the bottom part 41 of the dropping-down recessed part 41 may be arranged at a least one side of thinning the recessed part 42 by enabling reception of the bead 31a at the time of assembling the tire 31. Ribs 44 which has flat shapes and cross the thinning recessed parts 42 are provided at a plurality of portions at intervals in the peripheral direction of the thinning recessed part 42 so that outer ends may be arranged to be flush with the dropping-down surface 43 or in the vicinity of an inward side of the dropping-down surface 43. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a pair of annular bead seats for seating inner beads of the tire when the tires are mounted, and the beads can be dropped when the tires are assembled. And an annular drop recess recessed inwardly along the inner side of the vehicle.

Such a vehicle wheel is known from Patent Document 1, for example.
Japanese Patent No. 3279886

  In the above-mentioned Patent Document 1, in order to reduce the weight of the wheel, the connecting portions of the plurality of spokes to the rim have a thickness so that a part of the dropping recess is further recessed inward in the radial direction of the tire. Although it has been removed, it is desirable to reduce the weight.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a vehicle wheel that can be further reduced in weight.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a pair of annular bead seats for seating a bead on the inner periphery of the tire when the tire is mounted, and dropping the bead when the tire is assembled. Preferably, in a vehicle wheel in which an annular dropping recess recessed inward in the radial direction of the tire from both bead seats is provided in a rim, recessed inward in the radial direction from the bottom of the dropping recess. An annular cut-out recess is provided on at least one of the cut-out recesses so that the bead can be received when the tire is assembled, and an annular drop surface formed on the bottom of the drop-down recess is arranged. Provided at a plurality of locations spaced in the circumferential direction of the thinning recesses in a flat plate shape along the radial direction and crossing the thinning recesses. But it is characterized in that it is provided so as to place the outer end inwardly vicinity along the radial direction of the darken surface flush or the darken surface.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the deepest portion of the hollow recess is biased from the center of the rim along the axial direction of the tire to one side along the axial direction. The brake drum is arranged on the biased side of the deepest portion.

  According to a third aspect of the invention, in addition to the configuration of the second aspect of the invention, the deepest portion is disposed inward along the radial direction of the tire with respect to the outer peripheral surface of the brake drum. To do.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the invention, an air injection valve is attached so as to inject compressed air into the lightening recess.

  According to a fifth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the mounting position of the air injection valve is set to be substantially the same as the outer peripheral surface of the brake drum along the radial direction of the tire. It is characterized by that.

  Furthermore, in the invention of claim 6, in addition to the configuration of the invention of claim 2, the air injection valve is disposed in the vicinity of the deepest portion on the side opposite to the deepest portion with respect to the center of the rim. It is characterized by.

  According to the first aspect of the present invention, since the hollowing recess recessed radially inward from the dropping recess is provided over the entire circumference of the wheel, the wheel can be reduced in weight while avoiding the strength reduction, In addition, when the tire is assembled, it is possible to prevent the bead on the inner periphery of the tire from falling into the lightening recess by the plurality of ribs, and the tire can be assembled in the same manner as in the past.

  According to the second aspect of the present invention, the lightening recess can be formed deeper by the brake drum, and the weight of the wheel can be more effectively reduced.

  According to the invention described in claim 3, it is possible to further reduce the weight of the wheel even more effectively by forming the thinned concave portion deeply.

  According to the fourth aspect of the invention, the degree of freedom in arrangement of the air injection valve can be increased, and the air injection valve can be arranged at a position where the air injection operation becomes easy.

  According to the fifth aspect of the present invention, the degree of freedom in arrangement of the air injection valve can be further increased, and the air injection valve can be arranged at a position where the air injection operation becomes easier.

  Furthermore, according to the sixth aspect of the present invention, the degree of freedom in arrangement of the air injection valve can be increased, and the air injection valve can be arranged at a position where the air injection operation becomes easy.

  1 to 5 show an embodiment of the present invention, FIG. 1 is a side view of a swing type tricycle to which the present invention is applied, and FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 3 is an enlarged longitudinal sectional view of the rear wheel, FIG. 4 is a sectional view taken along line 4-4- of FIG. 3, and FIG. 5 is an enlarged view of a main part of FIG.

  First, in FIG. 1, a cabin 6 with a roof having a windscreen 5 disposed on the front surface is formed at the center of a vehicle body B provided in the swing type tricycle so that the bottom surface is a low floor type floor 7. The steering handle 8 is supported on the front wall of the cabin 6, and a riding seat 9 on which a vehicle driver is seated is disposed behind the steering handle 8 in the cabin 6. A single front wheel WF that is steered by the steering handle 8 is movably suspended at the front portion of the vehicle body B. The vehicle body B is below the riding seat 9 and is located at the front portion of the swing unit 10. Are supported so as to swing up and down, and a pair of left and right rear wheels WR are pivotally supported on the rear part of the swing unit 10. Further, a cushion unit 56 is provided between the rear portion of the vehicle body B and the swing unit 10.

  In FIG. 2, the swing unit 10 is composed of an engine E having four cycles and a transmission device T that transmits the power of the engine E to both rear wheels WR and WR. A belt-type continuously variable transmission 12 that continuously changes the output of the engine E and transmits it to the transmission shaft 11, a centrifugal clutch 13 interposed between the continuously variable transmission 12 and the transmission shaft 11, and a transmission shaft 11 and a differential gear 15 interposed between the left and right axles 16L and 16R and the gear train 14 individually corresponding to the left and right rear wheels WR and WR.

  The engine E is configured, for example, as a water-cooled single cylinder, and includes a crankcase 17, a cylinder block 18 having a forwardly inclined cylinder axis and extending forward from the crankcase 17, and a front portion of the cylinder block 18. And a head cover 20 coupled to the front portion of the cylinder head 19.

  One end of the crankshaft 21 rotatably supported by the crankcase 17 protrudes from the crankcase 17 on the right side along the traveling direction of the swing type tricycle. An AC generator 23 covered with a generator cover 22 coupled to the crankcase 17 is connected.

  The camshaft 24 is rotatably supported on the cylinder head 19 so as to constitute a part of a valve operating device that opens and closes an intake valve and an exhaust valve (not shown) disposed in the cylinder head 19. And the crankshaft 21 close to the AC generator 23, a timing transmission device 25 is provided, and the rotational power of the crankshaft 21 is reduced by half by the timing transmission device 25. It is transmitted to the camshaft 24.

  A case main body 26 extending rearward from the crankcase 17 is connected to the crankcase 17 on the left side in the traveling direction of the swing type tricycle, and a right cover 27 fastened to the right side of the case main body 26 A transmission case 29 is constituted by the left cover 28 fastened to the left side of the case main body 26 and the case main body 26, and the transmission device T is accommodated in the transmission case 29.

  By the way, the left and right axles 16L and 16R are extended from the differential gear 15 to the left and right, and rear wheels WR and WR are respectively provided at projecting ends of the left and right axles 16L and 16R from the transmission case 29. The rear wheels WR and WR are connected to drum brakes B and B, respectively.

  In FIG. 3, the left rear wheel WR is formed by attaching a tire 31 to a wheel 30, and the wheel 30 includes a hub 32 connected to the left axle 16 </ b> L so as not to be relatively rotatable, and a rim to which the tire 31 is attached. 33 and a ring-shaped disk 34 that connects the outer periphery of the hub 32 and the inner periphery of the rim 33 over the entire periphery are integrally formed and cast by a light alloy such as an aluminum alloy.

  The hub 32 is formed in a substantially cylindrical shape, and has an axle connecting portion 35 in which a first insert ring 38 is insert-coupled to the inner periphery, and a substantially cylindrical shape surrounding the axle connecting portion 35 coaxially. Both include a brake drum 36 in which the second insert ring 39 is inserted and connected to the inner periphery, and an axle connecting portion 35 and a ring plate-like connecting plate portion 37 that connects one end of the brake drum 36. It is connected to the left axle 16L to be inserted in such a manner that axial relative movement and relative rotation are impossible.

  Further, on the rim 33, as shown by a solid line in FIG. 3, when the tire 31 is mounted, a pair of annular bead seats 40, 40 on which inner beads 31a, 31a of the tire 31 are seated, and a chain line in FIG. The bead 31a, 31a can be dropped when assembling the tire 31 as shown in FIG. 2 and an annular drop recess 41 is recessed from the bead seats 40, 40 inwardly along the radial direction of the tire 31. Provided.

  The disk 34 is formed so that its width becomes narrower toward the inside along the radial direction of the tire 31, and integrally connects the inner periphery of the rim 33 and the outer periphery of the connecting plate portion 37 in the hub 32.

  In the wheel 30, an annular hollow recess 42 that is recessed inward along the radial direction of the tire 31 from the bottom of the drop recess 41 reaches the outer periphery of the hub 32 from the rim 33 through the disk 34. At least one of the thinned recesses 42, both in this embodiment, is formed at the bottom of the drop recess 42 so that it can receive both beads 31a when assembling the tire 31 shown by the chain line in FIG. An annular drop surface 43 is arranged.

  Referring also to FIG. 4, ribs 44, 44... That cross the thinning recess 42 in a flat shape along the radial direction of the tire 31 are provided at a plurality of positions spaced in the circumferential direction of the thinning recess 42. However, in this embodiment, the outer ends of the ribs 44, 44... Are arranged so that the outer end is flush with the dropping surface 43 or in the vicinity of the inward side along the radial direction of the dropping surface 43. It is set flush with the dropping surface 43.

  In addition, the deepest portion 42a of the lightening recess 42 is disposed so as to be deviated from the center C of the rim 33 along the axial direction of the tire 31 to one side along the axial direction, that is, on the swing unit 10 side, and on the deviated side of the deepest portion 42a. The brake drum 36 is disposed, and the deepest portion 42 a is disposed inward along the radial direction of the tire 31 with respect to the outer peripheral surface of the brake drum 36.

  An air injection valve 45 for injecting compressed air into the tire 31 is attached to the wheel 30, and the air injection valve 45 injects compressed air into the lightening recess 42, The air injection valve 45 is disposed in the vicinity of the deepest portion 42a on the side opposite to the deepest portion 42a with respect to the center C of the rim 33, and extends along the radial direction of the tire 31. The disc 34 is attached to the outer periphery of the brake drum 36 at substantially the same position.

  In FIG. 5, the drum brake B includes the brake drum 36, a brake panel 46 provided integrally with the left cover 28 of the transmission case 29 so as to face the opening end of the brake drum 36, and the brake brake 46. A brake shoe 48 whose one end is connected to the pivot shaft 47 to be supported, a brake shoe 49 whose one end is supported on a pivot 50 that is pivotally supported on the brake panel 46, and the pivot shaft 47. And a lever 51 having one end connected thereto.

  Thus, by pulling a brake cable (not shown) connected to the other end of the lever 51 and driving the rotary shaft 47 to rotate, both the brake shoes 48 and 49 are connected to the inner periphery of the brake drum 36. Is pressed against the second insert ring 39, and the drum brake B exhibits a braking force.

  The brake drum 36 is surrounded by a cylindrical waterproof plate 52. The waterproof plate 52 includes a small-diameter cylindrical portion 52a that coaxially surrounds the distal end portion of the brake drum 36, and a large-diameter cylindrical portion 52b that coaxially surrounds the proximal end side of the brake drum 36 with a larger diameter than the small-diameter cylindrical portion 52a. And an inward flange 52c provided integrally with the end of the small-diameter cylindrical portion 52a on the opposite side to the large-diameter cylindrical portion 52b on the brake panel 46. For example, the waterproof plate 52 is extended from the brake panel 46 so that the tip of the waterproof plate 52 faces the disk 34 of the wheel 30 by being fixed by a plurality of screw members 57. Further, an annular groove 53 is provided on the outer periphery of the brake drum 36 in correspondence with the connecting portion of the small diameter cylindrical portion 52 a and the large diameter cylindrical portion 52 b in the waterproof plate 52.

  Further, the small-diameter cylindrical portion 52a surrounds the brake drum 36 by forming a slight annular gap with the outer periphery of the distal end portion of the brake drum 36, and the tip of the brake drum 36 is a portion corresponding to the small-diameter cylindrical portion 52a. A plurality of, for example, two labyrinth grooves 58, 58 that are annular are provided on the outer periphery of the part.

  On the other hand, at the portion corresponding to the connecting portion between the rim 33 and the disk 34, the wheel 30 is provided with an annular waterproof rib 54 that coaxially surrounds the large-diameter cylindrical portion 52b that is the tip of the waterproof plate 52. The waterproof rib 54 is formed integrally with the wheel 30.

  In addition, the waterproof rib 54 is disposed at substantially the same position as the dropping surface 43 of the wheel 30 along the radial direction of the tire 31, and an annular recess in which the tip of the waterproof plate 52 is inserted on the side surface of the wheel 30. 55 is provided such that its outer peripheral wall is formed by the waterproof rib 54 and its inner periphery is formed by the outer periphery of the brake drum 36.

  The right rear wheel WR is configured in the same manner as the above-described left rear wheel WR, and the main components thereof are only illustrated with reference numerals in the same position as the left rear wheel WR. Detailed description is omitted.

  Next, the operation of this embodiment will be described. In the rear wheel 30, a drop recess 41 formed in an annular shape on the rim 33 so that the beads 31 a and 31 a of the tire 31 can be dropped when the tire 31 is assembled. An annular hollow recess 42 that is recessed inward in the radial direction of the tire 31 from the bottom of the tire 31 is formed at the bottom of the drop recess 41 so that the bead 31a of the tire 31 can be received when the tire 31 is assembled. Since the annular drop surface 43 is provided so as to be disposed in at least one of the lightening recesses 42 (both in this embodiment), the weight of the wheel 30 can be further reduced.

  Moreover, ribs 44, 44... That are flat in the radial direction of the tire 31 and traverse the thinning recesses 42 are provided at a plurality of locations spaced in the circumferential direction of the thinning recesses 42. Since it is provided so that it is flush or disposed in the vicinity of the inward side along the radial direction of the dropping surface 43, it is possible to avoid a decrease in strength due to the formation of the hollow recess 42, while the tire 31 is assembled. The bead 31a, 31a on the inner periphery can be prevented from falling into the lightening recess 42 by the plurality of ribs 44, 44..., And the tire 31 can be assembled as in the conventional case.

  Further, the deepest portion 42a of the lightening concave portion 42 is arranged to be biased to one side along the axial direction from the center C of the rim 33 along the axial direction of the tire 31, and the brake drum 36 is arranged on the biased side of the deepest portion 42a. Therefore, the arrangement of the brake drum 36 can make the lightening recess 42 deeper, and the weight of the wheel 30 can be reduced more effectively.

  Further, since the deepest portion 42a is disposed inward along the radial direction of the tire 31 rather than the outer peripheral surface of the brake drum 36, the lightening recess 42 is formed deeper, and the weight of the wheel 30 is further effectively reduced. Can be planned.

  Moreover, since the air injection valve 45 for injecting compressed air into the tire 31 is attached to the wheel 30 so as to inject the compressed air into the hollow recess 42, the degree of freedom in arrangement of the air injection valve 45 is increased. The air injection valve 45 can be arranged at a position where the air injection operation becomes easy.

  Further, the mounting position of the air injection valve 45 is set to be substantially the same position as the outer peripheral surface of the brake drum 36 along the radial direction of the tire 31, and the air injection valve 45 is opposite to the deepest portion 42 a with respect to the center C of the rim 33. Since it is arranged near the deepest portion 42a on the side, the degree of freedom in arrangement of the air injection valve 45 can be further increased, and the air injection valve 45 can be arranged at a position where the air injection operation becomes easier.

  By the way, a cylindrical waterproof plate 52 that surrounds the brake drum 36 provided on the hub 32 of the wheel 30 and has the tip opposed to the wheel 30 extends from the brake panel 46 facing the opening end of the brake drum 36. However, an annular waterproof rib 54 is provided on the wheel 30 so as to surround the tip of the waterproof plate 52. Accordingly, since a simple labyrinth structure is formed between the wheel 30 including the brake drum 36 and the waterproof plate 52, and the distance from the labyrinth structure to the opening end of the brake drum 36 can be relatively long, the wheel 30 and the waterproof plate It is possible to achieve effective waterproofing by eliminating the need for strict management of the gap between the 52 and avoiding the occurrence of friction in the waterproof part. Moreover, since the wheel 30 and the waterproof rib 54 are integrally formed, the number of parts can be reduced.

  Further, the waterproof rib 54 is arranged at substantially the same position as the dropping surface 43 of the wheel 30 along the radial direction of the tire 31, so that the dropping recess 41 is formed and the strength of the rim 33 is not lowered. Thus, it can be reinforced by the waterproof rib 54.

  Further, since the annular recess 55 into which the tip of the waterproof plate 52 is inserted is provided on the side surface of the wheel 30 so that the outer peripheral wall is formed by the waterproof rib 54, the weight of the wheel 30 can be reduced. Since the wrap allowance of the waterproof plate 52 and the waterproof rib 54 can be increased, the waterproof plate 52 and the waterproof rib 54 can be disposed so as to further enhance the waterproof effect by the labyrinth.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

1 is a side view of a rocking type tricycle to which the present invention is applied. It is an expanded sectional view which follows the 2-2 line of FIG. It is an enlarged vertical sectional view of a rear wheel. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3. It is a principal part enlarged view of FIG.

Explanation of symbols

30 ... Wheel 31 ... Tire 31a ... Bead 33 ... Rim 36 ... Brake drum 40 ... Bead sheet 41 ... Drop recess 42 ... Meat removal recess 42a ... Meat Deepest part 43 of the recessed part 43 ... Dropping surface 44 ... Rib 45 ... Air injection valve

Claims (6)

  A pair of annular bead seats (40) on which a bead (31a) on the inner periphery of the tire (31) is seated in a mounted state of the tire (31), and the bead (31a) is dropped when the tire (31) is assembled. In the vehicle wheel in which an annular drop recess (41) that is recessed inward in the radial direction of the tire (31) from both the bead seats (40) is provided in the rim (33), An annular hollow recess (42) recessed inward along the radial direction from the bottom of the drop recess (41) allows the bead (31a) to be received when the tire (31) is assembled. An annular drop surface (43) formed on the bottom of the recess (41) is provided so as to be disposed on at least one of the meat recess (42), The rib (44) which cross | intersects the said hollow part recessed part (42) by making into flat form along the said radial direction in the several places spaced apart in the circumferential direction of the part (42), and an outer end is said dropping surface (43) A vehicle wheel, wherein the vehicle wheel is provided so as to be flush with or in the vicinity of an inner side along the radial direction of the dropping surface (43).   The deepest portion (42a) of the lightening recess (42) is disposed offset from the center of the rim (33) along the axial direction of the tire (31) to one side along the axial direction, and the deepest portion ( The vehicle wheel according to claim 1, wherein a brake drum (36) is arranged on the bias side of 42a).   The vehicle wheel according to claim 2, wherein the deepest portion (42a) is disposed inward along the radial direction of the tire (31) with respect to the outer peripheral surface of the brake drum (36).   The vehicle wheel according to claim 1, wherein an air injection valve (45) is attached so as to inject compressed air into the lightening recess (42).   The mounting position of the air injection valve (45) is set substantially at the same position as the outer peripheral surface of the brake drum (36) along the radial direction of the tire (31). Vehicle wheel.   The vehicle wheel according to claim 2, wherein the air injection valve (45) is disposed in the vicinity of the deepest portion on the opposite side of the deepest portion (42a) with respect to the center of the rim (33). .

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