JPH0225728Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parking lock device for a vehicle power unit equipped with a centrifugal starting clutch.

A vehicle power unit equipped with a centrifugal starting clutch is used in tricycles, motorized four-wheeled vehicles, etc.A centrifugal starting clutch has a clutch that expands due to centrifugal force at a predetermined rotational speed of the engine, and a clutch that opens on the axle side. The clutch is provided with a clutch outer and the like to be connected to the clutch shoe.

Conventionally, in this type of vehicle power unit, a parking lock is provided with a parking plate having teeth on the outer periphery, and the parking plate is fixed to a drive shaft parallel to the axle and connected to the axle through meshing of gears. This is done by engaging and disengaging the parking arm from the teeth.

Therefore, conventional parking lock devices require components such as a drive shaft and gears that engage the drive shaft and axle, resulting in a large number of parts dedicated to the parking lock, and the space layout makes it impossible to increase the diameter of the parking plate. Therefore, the surface pressure exerted on the parking arm and parking plate becomes large, and the thickness of the parking arm and parking plate must be increased accordingly, which effectively reduces the size and cost of the vehicle power unit. There were some problems such as difficulty.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a parking lock device that can achieve downsizing and cost reduction of a power unit for a vehicle.

In order to achieve the above-mentioned problems, the present invention has been developed for a vehicle power unit that is equipped with a kick starter shaft that enables engine starting and that drives wheels from the engine output shaft via a starting clutch. A parking plate having an engaging portion on the outer periphery is provided coaxially with the clutch outer, and a locking member that can be freely engaged and disengaged from the engaging portion by rotation of the parking lock shaft is provided, and the parking plate is connected to the parking lock shaft. It is characterized in that it is arranged below the kick starter shaft.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a left side view of a tricycle as an example of a vehicle in which the present invention is implemented, with exterior parts removed, and FIG. 2 shows a plan view of the same with the rear part of the frame removed.

A head tube 3 is provided at the front end of the front frame 2 of the tricycle 1. A front fork 5 that supports a front wheel 4 is supported on the head tube 3 in a freely steerable manner, and a handle 6 and a parking lock lever are mounted on a steering stem 6a. 7 will be provided.

The front frame 2 includes a down tube 2a extending diagonally rearward from the head tube 3, and a down tube blower 2b extending rearward from the lower end of the down tube 2a.

The rear frame 11 is made up of two left and right plates with approximately Z-shaped sides, the front lower part 11a is joined to the left and right sides of the down tube blower 2b, the middle part 11b is raised upward to serve as a seat post, and the middle part 11b is connected from the upper end to the seat post. The rear part 11c that extends rearward and is at a high position serves as the seat rail and the rear part of the frame, and the fuel tank 12 is horizontally suspended between the upper parts of the intermediate part 11b.
A sheet (not shown) is placed on top of 2.

The front end of a support shaft 13 is pivotally supported in the middle part of the lower part 11a of the rear frame 11 via a link 14 so as to be vertically swingable, the support shaft 13 extends rearward, and the rear part is rotatably coupled to a connecting member 15. However, the vertical swing of the support shaft 13 is damped by a buffer 16 provided between the rear frame 11 and the support shaft 13.

The connecting member 15 includes a joint case 15a as shown in FIG.
A bracket portion 15b is formed on the right side of a.

A cable guide 21 is attached to the left front end of the joint case 15a, and the cable outer end of a cable 22 connected to the parking lock lever 7 is attached to the cable guide 21.

A swing link 23 is provided at the rear part of the cable guide 21 in the joint case 15a, and the cable inner 22a exposed from the cable guide 21 is connected to one end of the swing link 23, and the cable inner 22a exposed from the cable guide 21 is connected to the other end of the swing link 23. connects the front end of the rearwardly extending rod 24.

Behind the lower portion 11a of the rear frame 11 and below the rear portion 11c, a power unit 33 is provided with left and right rear wheels 31 and 32 mounted thereon.

The power unit 33 is equipped with an engine 34 as shown in FIGS. 4 to 9.
1 shows a cylinder block 42 and a cylinder head 43 forming a cylinder slightly tilted backwards and upwards at the rear of the crankcase 41, a piston 44 housed in the cylinder, and an engine output shaft connected to the piston 44 via a connecting rod 45. . The engine is composed of a crankshaft 46, etc., and a spark plug 47 is attached to a cylinder head 43. The embodiment shows an air-cooled engine.

The crankcase 41 is divided into left and right halves 5.
1 and 52, left and right crankcase covers 53 and 54 are provided on the outside of the split halves 51 and 52, respectively.
A shroud 55 is attached to cover the cylinder block 42 and the cylinder head 43, and the front part of the right half 52 is extended forward to form a mounting bracket 52a, and the joint case 15a is The bracket portion 15b and the mounting bracket 52a are connected together.

A carburetor 56 is disposed on the upper surface of the right half 52, and a starter motor 57 is mounted on the front upper end of the side surface of the left half 51 with its axis parallel to the axis of the crankshaft 46. .

Both ends 46a, 4 of the crankshaft 46
6b is the side wall portion 51 of the left and right divided halves 51 and 52;
c and 52c, respectively, and a hole 61 is provided through the right end portion 46b, and the side wall portion 5
A pinion 62 is attached to the outwardly exposed part of 2c,
Attach the plate 63 that forms the inner part of the starting clutch C.

The plate 63 is provided with centrifugally expanding clutches 64, . . . which are expanded by centrifugal force when the engine speed reaches a predetermined value in a low rotational speed range, such as idling rotation or higher, through pins 65. Teeth 63a are formed on the outer periphery of the plate 63 to mesh with the pinion 57a of the starter motor 57,
The driving force of the starter motor 57 is transmitted to the crankshaft 46 via the plate 63, and the starter motor 57
The engine can be started freely by

Left end 46a of the crankshaft 46
is an extending portion 46b extending outward from the side wall portion 51c.
The ACG 66 is provided on the extending portion 46b.

A bearing portion 53b is formed on the side wall portion 53a of the left crankcase cover 53, and the axle 67 of the rear wheel 31 is rotatably supported by the bearing portion 53b, and the left rear wheel 31 is configured as a rolling wheel. A support piece 53c is provided protruding from the middle part of the front wall of the cover 53, and an inlet hole 5 for forced air cooling is provided at the outer upper part of the front wall.
Open 3d.

In front of the crankshaft 46, an intermediate shaft 71 and a kick starter shaft 72 are provided with their axes parallel to the axis of the crankshaft 46.

The kick starter shaft 72 has left and right divided halves 5.
The side wall portions 51c and 52c of No. 1 and 52 and the support piece 53c are inserted therethrough, and a kick starter arm is connected to the end of the kick starter shaft 72 exposed from the support piece 53c.

A transmission gear 73 is rotatably fitted near the right side wall 52c of the kick starter shaft 72, and the screw starter shaft 72 and the transmission gear 73 are connected to the quick screw mechanism 7.
4 so that it can be connected and disconnected freely.

The intermediate shaft 71 has both ends connected to the left and right side walls 51.
A transmission gear 75 that meshes with the pinion 62 is attached to a portion exposed to the outside of the right side wall portion 52c, and a gear 76 is installed at an interval to the inside portion of the right side wall portion 52c. , 77, one gear 76 meshes with the transmission gear 73, and the other gear 77 meshes with the oil pump gear 78.

Therefore, the driving force of the kick starter shaft 72 is generated by the quick screw mechanism 74, the gears 73, 76, 75, and the pinion 62.
The engine is transmitted to the crankshaft 46 via the engine, and the engine can be started freely using a kick starter.

A bearing part 54b is formed on the side wall part 54a of the right crankcase cover 54, and the axle 81 of the rear wheel 32, which is a driving wheel, is rotatably supported by the bearing part 53b. through the hole 6 of the crankshaft 46
1 so that it can rotate freely.

A large-diameter final gear 83 is attached near the bearing portion 54b of the axle 81, and the final gear 83
A cylindrical member 85 is rotatably fitted inside of the cylindrical member 85 via a needle bearing 84, and horizontal movement of the cylindrical member 85 is restricted via a washer and a snap spring 86.

A small-diameter transmission drive gear 87 is attached to the cylindrical member 85 closer to the final gear 83, and a clutch outer 88 is press-fitted and fixed closer to the inner end.

The clutch outer 88 includes an end surface portion 88a and a cylindrical portion 88b extending toward the plate 63 from the outer edge of the end surface portion 88a, and is disposed such that the clutch shoe 64 faces the inner peripheral surface of the cylindrical portion 88b.
The plate 63, clutch shoe 64, clutch outer 88, etc. constitute a starting clutch C.

A parking plate 92 is attached to the end surface portion 88a of the clutch outer 88 via a pin 91.

The outer diameter of the parking plate 92 is approximately equal to or slightly larger than the outer diameter of the cylindrical portion 88b, and toothed portions 92a are formed on the outer periphery to form a locking portion.

A deceleration counter shaft 101 is located in front of the axle 81.
The side wall portion 5 of the crankcase cover 54
4a supports the outer end portion of the deceleration counter shaft 101.

a small-diameter final reduction gear 102 that meshes with the final gear 83 on the reduction counter shaft 101;
A large-diameter reduction gear 103 that meshes with the transmission drive gear 87 is attached, and the inner end of the reduction counter shaft 101 is supported by one end of a support plate 104 attached to the side wall portion 54a of the crankcase cover 54. The transmission drive gear 87, the reduction gear 103, the final reduction gear 102, and the final gear 83 constitute a reduction mechanism R.

In front of the axle 81 and the power unit 33
As shown in FIG. 8, on the bottom side of
12 will be provided.

The parking shaft 112 has a right end portion 112.
a is the side wall portion 5 of the right crankcase cover 54
4a, the intermediate part 112b is rotatably supported by the side wall part 52c of the right divided half body 52, and the part near the left end part 112c is rotatably supported by the side wall part 51c of the left divided half body 51, and the connecting member 113 is attached to the left end part 112c. The rear end of the rod 24 is connected to the connecting member 113, and an arm 115 biased by a coil spring 114 is attached near the right end 112a.

The intermediate shaft 111 has a right end 111a supported by the side wall 54a of the right crankcase cover 54, a left end 111b supported by the side wall 52c of the right split half 52, and a snap spring 116 near the right end 111a. A parking arm 117 serving as a locking member is rotatably attached.

The head 117a of the parking arm 117 is formed with a pawl 117b that can freely engage with the teeth 92a of the parking plate 92.
17a and the tip of the arm 115 are connected by links 118, 118 so as to sandwich them from both sides.

Said parking lock lever 7, cable 2
2. Swing link 23, rod 24, parking shaft 112, arm 115, link 118, parking arm 117, parking plate 92
etc. constitute a parking lock device P in which the pawl 117b can be freely engaged and disengaged from the tooth portion 92a by operating the parking lock lever 7, and the spring 1
14 urges the pawl 117b in the direction of biting into the tooth portion 92a.

Note that the left rear wheel 31 is the rolling wheel, and the right rear wheel 3 is the rolling wheel.
2 is used as a drive wheel to drive one of the left and right rear wheels, the axis _N1 of the right rear wheel 32 is tilted forward to provide toe-in to the rear wheel 32, and the center of the engine 34 is The line _N2 was tilted to the right with respect to the vehicle body axis _N3 .

In addition, 121 in the drawing is a brake shaft that constitutes a brake mechanism,
122 indicates an air cleaner.

Since the present invention is constructed as described above, the engine is started by driving the crankshaft 46 by the starter shaft 72 or starter motor 57.

When the engine starts, the plate 63 forming the clutch inner is driven, while the axle 81 is at the inner end 81a.
is connected to the crankshaft 46 via the bearing 82.
Since it is rotatably supported in the hole 61 at the end,
Rotation of the crankshaft 46 is not transmitted to the axle 81.

When the engine speed is increased to a predetermined value, the clutch shoe 64 expands and engages the cylindrical portion 88b of the clutch outer 88, and the clutch outer 88 rotates integrally with the crankshaft 46.

The rotation of the clutch outer 88 causes the cylindrical member 85 to
The transmission drive gear 87 rotates via the reduction mechanism R.
The power is transmitted to the axle 81 via the power source to obtain driving power.

Next, when the parking lock is to be activated, the parking lock lever 7 is operated.

By operating the parking lock lever 7, the cable 22, rod 24, and parking shaft 11 are
2. The parking arm 117 swings toward the parking plate 92 via the arm 115, link 118, etc., and the pawl 117b engages with the tooth portion 92a to prevent the parking plate 92 from rotating.

By preventing the rotation of the parking plate 92, the clutch outer 88 and the cylindrical member 85 are prevented from rotating, and the rotation of the axle 81 is prevented via the reduction mechanism R, thereby forming a parking lock state.

Next, when canceling the parking lock state, operate the parking lock lever 7 and click the pawl 117b.
is detached from the toothed portion 92a, the parking plate 92 is made freely rotatable, and the clutch outer 88, the cylindrical member 85, the speed reduction mechanism R, and the axle 81 are made free to rotate, making it possible to travel.

Therefore, according to the present invention, since the parking plate 92 is provided using the clutch outer 88 constituting the starting clutch C, the parking plate 92
The diameter can be made significantly larger than that of the conventional method. That is, since the clutch outer 88 originally has a large diameter and is disposed in a space with a large diameter, the diameter of the parking plate 92 can be made large without making the power unit 33 any larger. The parking lock device P is made simple and compact by reducing the surface pressure on the portion 92a and the pawl 117b, and by reducing the thickness of the parking plate 92, parking arm 117, and arm 115, and the diameter of the intermediate shaft 111 and parking shaft 112. can also be used as a parking plate 92
The parking arm 117 and the like are less constrained by material, heat treatment, etc., and can contribute to cost reduction.

In addition, since the parking plate 92 is provided using the clutch outer 88, there is no need for a drive shaft, gears, etc. exclusively for the parking plate as in the past, and the number of parts can be reduced, contributing to cost reduction and further compactness. .

Furthermore, since the arm 115, parking arm 117, etc. are arranged at the bottom front side of the power unit 33, which is a dead space, it is advantageous in terms of appearance, and the parking lock device P can be provided without spoiling the appearance of the power unit 33. .

That is, the parking shaft 11 can be moved by effectively utilizing the space provided below the starter shaft 72.
2, the parking lock device P can be housed on the bottom side of the power unit 33 and the power unit 33 can be made smaller.

In the embodiment, the parking plate 92 is attached to the clutch outer 88, but the parking plate 92 may be attached to the cylindrical member 85 separately from the clutch outer 88, or the parking plate 92 may be integrated with the clutch outer 88. For example, an engaging portion such as a tooth portion may be formed on the outer periphery of the cylindrical portion 88b of the clutch outer 88. In this case, the parking plate 92 becomes unnecessary, and the device can be made more compact.

As is clear from the above explanation, according to the present invention, since the parking plate is provided using the clutch outer of the starting clutch, the diameter of the parking plate can be increased without enlarging the power unit in any way. It is possible to simplify and compact various parts by reducing the surface pressure that the parking arm receives, and it is also possible to reduce the number of parts by eliminating the need for conventional parts such as drive shafts and gears dedicated to parking plates. It exhibits many excellent effects, such as making it more compact and contributing to cost reduction. Since the parking lock shaft is disposed below the kick starter shaft, the parking lock device can be housed at the bottom of the power unit, thereby making it possible to downsize the power unit.

[Brief explanation of the drawing]

Figure 1 is a left side view of a tricycle as an example of a vehicle in which the present invention is implemented, with exterior parts removed, Figure 2 is a plan view of the same with the rear part of the frame removed, and Figure 3 is a rolling bicycle. Fig. 4 is a side view of the power unit, Fig. 5 is a front view of the same, Fig. 6 is a plan view of the same, Fig. 7 is a sectional plan view of the power unit, and Fig. 8 is a section of the parking shaft. FIG. 9 is a side view of the power unit with the parking arm section cut away. In the drawing, 33 is a power unit, 46 is a crankshaft, 63 is a plate, 64 is a clutch, 81 is an axle, 85 is a cylindrical member, 88 is a clutch outer, 92 is a parking plate, 10
1 is a deceleration counter shaft, 111 is an intermediate shaft, 112 is a parking shaft, 115 is an arm, and 117 is a parking arm.

Claims (1)

[Scope of utility model registration request] In a vehicle power unit that is equipped with a kick starter shaft that enables engine starting and drives wheels from the engine output shaft via a starting clutch,
A parking plate having an engaging portion on the outer periphery is provided coaxially with a clutch outer on the driven side constituting a starting clutch, and a locking member can be freely engaged and disengaged from the engaging portion by rotation of a parking lock shaft. What is claimed is: 1. A parking lock device for a vehicle power unit, characterized in that the parking lock shaft is disposed below the kick starter shaft.