JP3156170U - Saddle-type vehicle with shaft drive mechanism - Google Patents

Abstract

A straddle-type vehicle including a shaft drive mechanism capable of shortening a longitudinal length of a gear case assembly in a vehicle is provided. A straddle-type vehicle including a shaft drive mechanism, wherein the shaft drive mechanism includes a drive shaft that transmits power to drive wheels, at least one end of the drive shaft being fixed by a bevel gear 12, and the bevel gear 12 is a gear case. The bearing 20 is rotatably supported by a bearing 20, and the bearing 20 is formed with a circumferentially continuous groove 22 on the outer peripheral surface of the outer ring 20 a, and a pin 25 is attached to the gear case 15. The outer circumferential surface of the bearing outer ring 20 a extends in the tangential direction and is engaged with the groove 22 of the bearing 20. [Selection] Figure 3

Description

  The present invention relates to a straddle-type vehicle (particularly a motorcycle) having a shaft drive mechanism.

In a motorcycle, power is generally transmitted from an engine transmission to a rear wheel through a chain. However, there is also a shaft drive type motorcycle in which power is transmitted by a drive shaft arranged in the longitudinal direction of the vehicle body instead of the chain (see, for example, Patent Document 1). In the case of a chain, it is necessary to adjust the elongation due to long-term use or to lubricate frequently, but using the shaft drive type has the advantage that such problems can be solved and the driving efficiency can also be improved. .
JP 2007-216926 A

  In order to improve the motor performance and maneuverability of the motorcycle, it is preferable to collect heavy objects near the center of gravity of the vehicle and further increase the front wheel load ratio. The situation is the same for a motorcycle equipped with a shaft drive mechanism, and the longitudinal length of the gear case assembly including the gear and the gear case that houses the gear (the length in the longitudinal direction of the vehicle) should be as short as possible. Good. In addition, the smaller the number of parts of the shaft drive mechanism, the lighter the weight, and the lower the cost.

  The present invention has been made in view of the above points, and a main object of the present invention is to provide a straddle-type vehicle including a shaft drive mechanism that can reduce the length of the gear case assembly in the vehicle front-rear direction and contribute to weight reduction. It is to provide.

A straddle-type vehicle according to the present invention is a straddle-type vehicle including a shaft drive mechanism that is driven by a drive source, and the shaft drive mechanism includes a drive shaft that transmits power of the drive source to drive wheels, and a gear. A bevel gear disposed in the case and attached to at least one end of the drive shaft, and a bearing disposed in the gear case and rotatably supporting the bevel gear, and the bearing includes an outer peripheral surface of the outer ring. A circumferentially continuous groove is formed, and a pin is mounted on the gear case. The pin extends in a tangential direction of the outer peripheral surface of the outer ring of the bearing and engages with the groove of the bearing. Has been.
The bearing retaining structure according to the present invention is a bearing retaining structure that rotatably supports a gear on a gear case, and the bearing has a circumferentially continuous groove formed on the outer peripheral surface of the outer ring. A pin is attached to the gear case, and the pin extends in a tangential direction of the outer peripheral surface of the outer ring of the bearing and is engaged with a groove of the bearing.

  According to the present invention, the bevel gear that fixes one end of the drive shaft is rotatably supported by the bearing disposed in the gear case, and a circumferentially continuous groove is formed on the outer peripheral surface of the outer ring of the bearing. Since the mounted pin extends in the tangential direction of the outer peripheral surface of the bearing outer ring and is engaged with the groove of the bearing, the longitudinal length of the gear case assembly (length in the vehicle longitudinal direction) is shortened. Can do. In addition, since the bearing can be fixed without using a dedicated member for fixing the bearing serving as a bearing at one end of the drive shaft, the number of parts of the shaft drive mechanism can be reduced, and as a result, light weight. And / or cost reduction.

1 is an overall side view of a saddle riding type vehicle 1000 according to an embodiment of the present invention. It is sectional drawing which shows the shaft drive mechanism 100. (A) is sectional drawing along the IIIA-IIIA line | wire in FIG. (B) is sectional drawing which followed the IIIB-IIIB line | wire in Fig.3 (a). (C) is sectional drawing along the IIIC-IIIC line | wire in Fig.3 (a). (A) is a principal part enlarged view of the retaining structure 50 of a bearing, (b) is sectional drawing along the IVB-IVB line | wire in Fig.4 (a). FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25. FIG. 4 is an enlarged cross-sectional view of a main part showing a fixing structure of a pin 25.

  The inventor of the present application has studied the shortening of the longitudinal length (axial length) of the gear case assembly in a motorcycle equipped with a shaft drive mechanism. Achieved this by different schemes, leading to the present invention. Specifically, in order to shorten the axial length of the gear case assembly, a configuration that does not use a fixing member that normally exists between the drive shaft, which is a rotating body, and a bearing is used. The present invention has been reached.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity. In addition, this invention is not limited to the following embodiment.

A straddle-type vehicle 1000 and a bearing retaining structure 50 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is an overall side view of a saddle riding type vehicle 1000 including a shaft drive mechanism 100 according to the present embodiment. FIG. 2 is a cross-sectional view showing the shaft drive mechanism 100. FIG. 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. And FIG.3 (c) is sectional drawing along the IIIC-IIIC line | wire in Fig.3 (a).
FIGS. 4A and 4B are enlarged views of the main part of the bearing retaining structure 50 according to the present embodiment. FIG. 4A corresponds to the configuration shown in FIG. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A, and corresponds to the configuration shown in FIGS. 3B and 3C. Further, in the drawings, there are some portions where hatching is omitted in order to make the structure easy to see.

  As shown in FIG. 1, the saddle riding type vehicle 1000 of the present embodiment is a motorcycle including a shaft drive mechanism 100. The motorcycle 1000 of the present embodiment includes a front wheel 110, a rear wheel 120, and an engine 130 provided between the front wheel 110 and the rear wheel 120. A transmission 135 is provided adjacent to the engine 130, and a shaft drive mechanism 100 driven by the engine (drive source) 130 is disposed between the transmission 135 and the rear wheel 120.

  A front fork 140 that pivotally supports the front wheel 110 is provided on the front side of the motorcycle 1000, and the front fork 140 is connected to a handle 145. A fuel tank 150 for supplying fuel to the engine 130 and a seat 160 on which a rider sits are disposed behind the handle 145. The shaft drive mechanism 100 is located below the seat 160, and the rear wheel 120 is located obliquely below the seat 160.

  FIG. 2 shows the configuration of the shaft drive mechanism 100 of the present embodiment. The shaft drive mechanism 100 of this example includes a drive shaft 10, a rear arm 16, a gear case assembly 17 including a gear case 15, and a front drive gear 62. The drive shaft 10 of the shaft drive mechanism 100 is a member that transmits power to the rear wheels (drive wheels) 120. The drive shaft 10 is made of, for example, carbon steel for machine structure or alloy steel. A joint 11 is attached to the drive shaft 10 of this embodiment.

  The front end of the drive shaft 10 is connected to the transmission 135. Specifically, the front side of the drive shaft 10 is connected by a front drive gear 62 that transmits power from the shaft 60 of the transmission 135. In FIG. 2, the transmission 135 is schematically shown.

  On the other hand, a gear case assembly 17 including a drive gear 12 and a gear case 15 is located on the rear side of the drive shaft 10, and the rear drive gear 12 (that is, the gear case assembly 17) is located on the rear side of the drive shaft 10. Is fixed by a drive gear 12). The drive gear 12 at the rear of the present embodiment is a bevel gear (bevel gear). The bevel gear 12 is rotatably supported by a bearing 20 disposed in the gear case 15. The bearing 20 is fixed so as not to move in the axial direction or the longitudinal direction of the drive shaft 10 (that is, the longitudinal direction of the vehicle 1000) by the bearing retaining structure 50 of the present embodiment. The bearing retaining structure 50 will be described in detail with reference to FIGS.

  A drive gear (bevel gear) 12 positioned on the rear side of the drive shaft 10 is connected to a driven gear (bevel gear) 14. The transmitted power of the drive shaft 10 is transmitted to the axle 70 via the tooth contact surface 13 of the drive gear 12 and the driven gear 14, and the rear wheel 120 is driven by the rotation of the axle 70.

  FIGS. 3A to 3C show the configuration of the bearing retaining structure 50 of the present embodiment, and FIGS. 4A and 4B are enlarged views of the main part thereof.

  As shown in FIG. 3 (a) (or FIG. 4 (a)), a groove 22 is formed in the bearing 20 of the present embodiment. Specifically, on the outer peripheral surface of the outer ring 20a of the bearing 20, the circumferential direction A continuous groove 22 is formed. The groove 22 also serves as a bearing oil groove for bearing the drive shaft 10 (or a part of the drive gear 12 connected thereto) which is a rotating body. Bearing oil 80 for reducing friction is contained in a gear case 15 in FIG. In addition, the bearing 20 of this embodiment is a needle bearing.

  As shown in FIGS. 3B and 3C in addition to FIG. 3A, a pin 25 is attached to the gear case 15, and this pin 25 is tangent to the outer peripheral surface of the outer ring 20a of the bearing. Extending in the direction and engaged with the groove 22 of the bearing 20. The engagement between the groove 22 of the bearing 20 and the pin 25 prevents the bearing 20 from moving in the axial direction (the longitudinal direction of the vehicle 1000), that is, the bearing retaining structure 50 is constructed.

  In particular, as shown in FIGS. 3B and 4B, the pin 25 of this embodiment is attached to the gear case 15 by a bolt 29 via a bracket 27 that supports the pin 25. In the present embodiment, the combination of the bracket 27 and the bolt 29 is used as a member for mounting the pin 25 to the gear case 15, but other methods may be used.

  The pin 25 of the present embodiment is a cylindrical rod-like member, and is made of, for example, carbon steel for machine structure or alloy steel. Taking exemplary dimensions, the longitudinal length of the pin 25 is, for example, 5 to 50 mm, and the outer diameter of the pin 25 is, for example, 2 to 10 mm. The length L of the region where the pin 25 and the groove 22 engage is, for example, 0.05 to 10 mm.

  In the configuration of this embodiment, as shown in FIG. 2, the bevel gear (drive gear) 12 is connected to the drive shaft 10 via the joint 11. Further, as shown in FIG. 3A, the bevel gear 12 connected to the drive shaft 10 is fixed by a bearing (for example, a ball bearing) 18. Due to the configuration of the bearing 20, the bearing retaining structure 50, and the bearing 18, the bevel gear 12 can rotate without moving in the axial direction (the longitudinal direction of the vehicle 1000).

  According to the configuration of the present embodiment, the bevel gear 12 that fixes one end of the drive shaft 10 is rotatably supported by the bearing 20 disposed in the gear case 15, and is circumferentially arranged on the outer peripheral surface of the outer ring 20 a of the bearing 20. A continuous groove 22 is formed. The pin 25 attached to the gear case 15 extends in the tangential direction of the outer peripheral surface of the bearing outer ring 20 a and is engaged with the groove 22 of the bearing 20. Therefore, the bevel gear 12 can be prevented from coming off during rotation while having a simple configuration, and the longitudinal length of the gear case assembly 17 (the length in the vehicle front-rear direction) can be shortened.

  More specifically, when a bearing (for example, a needle bearing) serving as a bearing of the rotating body (here, the drive shaft 10 or the bevel gear 12) is fixed, in other words, between the rotating body and the bearing (in other words, in the shaft axial direction). Along with this, it is necessary to provide a fixing part (for example, clip, housing, retainer) for the bearing to fix the bearing. When such a fixing member is provided, a distance is formed between the rotating body and the bearing. On the other hand, in the configuration of the present embodiment, since such a fixing member is not provided, the distance between the rotating body (the drive shaft 10 or the bevel gear 12) and the bearing 20 can be reduced, and as a result, the gear case assembly. The longitudinal length (or axial length) of 17 can be shortened. For example, in the example shown in FIG. 4A, the distance d between the rotating body (bevel gear 12) and the bearing 20 is, for example, 3 mm or less (typically 0.5 to 2 mm). Thus, the length of the gear case assembly 17 can be shortened.

  In addition, in the configuration of the present embodiment, the engagement between the groove 22 of the bearing 20 and the pin 25 is performed without using a dedicated member for fixing the bearing interposed between the rotating body (10 or 12) and the bearing 20. The bearing 20 can be fixed. Therefore, the number of parts of the shaft drive mechanism 100 can be reduced, and as a result, weight reduction and / or cost reduction can be achieved. In addition, the weight reduction in a motorcycle has a much greater technical significance than the weight reduction of a passenger four-wheeled vehicle. The weight reduction improves the running performance and maneuverability of the motorcycle.

  In the configuration of the above-described embodiment, as illustrated in FIG. 5, the pin 25 that engages with the groove 22 of the bearing 20 is fixed to the gear case 15 by the bolt 29 via the bracket 27 that supports the pin 25. . However, as long as the pin 25 can be fixed to the gear case 15, the configuration is not limited to that, and other configurations (modified examples, other configurations) may be employed.

  In the configuration example shown in FIG. 5, the bracket 27 is bent at the base of the portion that supports the pin. For example, as shown in FIG. 6, the bracket 27 is flat. It is also possible to do. Further, as shown in FIG. 7, it is possible to fix the pin 25 with a bolt 29A without using the bracket 27. In this example, the pin 25 is fixed on the same axis as the pin 25 by the bolt 29A. Yes.

  Alternatively, the pin 25 can be fixed by a set screw 29B without using a bolt as shown in FIG. Further, as shown in FIG. 9, the pin 25 can be fixed by the resin 29C. In the example shown in FIG. 9, the pin 25 is fixed on the same axis as the pin 25 by filling or press-fitting the resin 29C into the hole.

  Furthermore, as shown in FIG. 10, the pin 25 can be fixed by press-fitting a tapered plug 29D. Further, as shown in FIG. 11, the pin 25 can be fixed by press-fitting a steel ball 29E, and as shown in FIG. 12, the pin 25 can be fixed by press-fitting a sheet metal plug 29F. .

  The vehicle 1000 shown in FIG. 1 is a motorcycle, but is not limited to a motorcycle, and can be applied to other vehicles that can use the effects of the present invention. For example, in addition to a motorcycle, a four-wheel buggy (ATV: All Terrain Vehicle (all-terrain vehicle)) and so-called saddle-type vehicles including snowmobiles can be applied. The “motorcycle” in this specification includes a motorbike and a scooter, and specifically refers to a vehicle that can turn by tilting the vehicle body. Therefore, even if at least one of the front wheels and the rear wheels is two or more and the number of tires is counted as a tricycle / four-wheel vehicle (or more), it can be included in the “motorcycle”. Furthermore, the bearing retaining structure 50 for rotatably supporting the gear on the gear case as described above can be widely applied to other vehicles and devices.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

  ADVANTAGE OF THE INVENTION According to this invention, the saddle riding type vehicle provided with the shaft drive mechanism which can shorten the vehicle front-back direction length of a gear case assembly can be provided.

10 Drive shaft 11 Joint 12 Bevel gear (drive gear)
13 Tooth contact surface 13
14 Driven gear 15 Gear case 16 Rear arm 17 Gear case assembly 20 Bearing 20a Bearing outer ring 22 Groove 25 Pin 27 Bracket 29 Bolt 50 Bearing retaining structure 60 Shaft 62 Front drive gear 70 Axle 80 Bearing oil 100 Shaft drive mechanism 1000 Type vehicle (motorcycle)
110 Front wheel 120 Rear wheel (drive wheel)
130 Engine 135 Transmission 140 Front fork 145 Handle 150 Fuel tank 160 Seat

Claims (3)

A straddle-type vehicle having a shaft drive mechanism driven by a drive source,
The shaft drive mechanism is
A drive shaft that transmits the power of the drive source to the drive wheels;
A bevel gear disposed within the gear case and attached to at least one end of the drive shaft;
A bearing disposed in the gear case and rotatably supporting the bevel gear;
The bearing is formed with a circumferentially continuous groove on the outer peripheral surface of the outer ring,
A pin is attached to the gear case,
The straddle-type vehicle, wherein the pin extends in a tangential direction of the outer peripheral surface of the outer ring of the bearing and is engaged with a groove of the bearing.   The straddle-type vehicle according to claim 1, wherein the pin is attached to the gear case by a bolt via a bracket that supports the pin. A bearing retaining structure that rotatably supports the gear in the gear case,
The bearing is formed with a circumferentially continuous groove on the outer peripheral surface of the outer ring,
A pin is attached to the gear case,
The bearing is a retaining structure for a bearing, wherein the pin extends in a tangential direction of an outer peripheral surface of the outer ring of the bearing and is engaged with a groove of the bearing.

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