JPS633430Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a variable speed starter in which the rotating shaft of a prime mover and its output rotating shaft are connected by a planetary gear reduction device.

2. Description of the Related Art Conventionally, for example, a starter for an internal combustion engine as shown in FIG. 1 has been known. In this figure, 1 is a starter motor (for example, a DC motor), 2 is a housing (machine frame) of this prime mover 1, 3 is an intermediate bracket provided at the front end of the housing 2, and 4 is a rotating shaft of the prime mover 1. , and the front end 4 of this rotating shaft 4
a is supported by an intermediate bracket 3 via a ball bearing 5. Reference numeral 6 denotes a planetary gear reduction device, which includes a spur gear 6a formed on the outer periphery of the front end 4a of the rotating shaft 4, an internal gear 6b arranged so as to surround this spur gear 6a, and an internal gear 6a and an internal gear. gear 6
The arm 6e includes a planetary gear 6c meshing with both the planetary gear 6c and the arm 6e provided with a support pin 6d for the planetary gear 6c. A sleeve bearing 6f is interposed between the planetary gear 6c and its support pin 6d, and the internal gear 6b straddles the intermediate bracket 3 and the front bracket 7 and is integral with the outer peripheral portion of the auxiliary plate 8. is fixed.

An output rotating shaft 10 is supported in the center of the auxiliary plate 8 via a sleeve bearing 9, and an arm 6e of the planetary gear reduction device 6 is provided on the outer periphery of the rear end of the output rotating shaft 10.

Reference numeral 11 designates an overrunning clutch, which has a clutch inner 11a that is fitted and supported on the outer periphery of the output rotating shaft 10 via a sleeve bearing 12, and is engaged and connected to the clutch inner 11a in the axial direction, that is, in the direction of the arrow 13. clutch outer 1
1b, and a friction roller 11c interposed between the clutch inner 11a and the clutch outer 11b, a pinion 14 is formed on the outer periphery of the front end of the clutch inner 11a, and the clutch outer 11
The inner periphery 11d of the rear end portion of b is fitted into a helical spline 10a formed on the outer periphery of the output rotating shaft 10 and connected in the rotation direction.

15 is a shift lever, one end 16a of which
is cam engaged with the outer periphery of the clutch outer 11b. 16 is a lever holder supported by the front bracket 7 so as to be slidable in the direction of arrow 13;
A support pin 15b provided at an intermediate portion of the shift lever 15 is supported by the lever holder 16. 17 is a grommet, and this grommet 1
A lever spring 18 is interposed between the front bracket 7 and the lever holder 16, and the lever spring 18 biases the lever holder 16 toward the inner wall surface 7a of the front bracket 7. 19 is a flywheel gear of an internal combustion engine in which the pinion 14 meshes;
20 is an electromagnetic switch device, and the other end of the shift lever 15 is engaged with the plunger 20a of this electromagnetic switch device 20.

Next, the operation of the above configuration will be explained. The shift lever 15 is a plunger 20 of an electromagnetic switch device 20.
When a is operated in the direction of the arrow 13a, it is rotationally driven in the direction of the arrow 21a about the fulcrum pin 15b. As a result, the overrunning clutch 11 is pushed and slid on the output rotating shaft 10 in the direction of the arrow 13b, and the pinion 14 meshes with the flywheel gear 19 of the internal combustion engine. Furthermore, as described above, the plunger 20a of the electromagnetic switch device 20 operates and its main contact circuit (not shown) is closed, thereby rotationally driving the rotating shaft 4 of the prime mover 1.
The rotational speed of the rotating shaft 4 is reduced by the free movement of the planetary gear 6c and is transmitted to the output rotating shaft 10. At this time, the rotational force of the output rotating shaft 10 is transmitted from the helical spline 10a to the clutch outer 11b, and in this rotation direction, the clutch outer 11
A friction roller 11c is placed between the clutch inner 11a and the clutch inner 11a.
By being clamped, the clutch inner 11a, pinion 14, and flywheel gear 19 are
The internal combustion engine is then started.

After the internal combustion engine is started, the pinion 14 is reversely biased by the flywheel gear 19, but the overrunning clutch 11 is a one-way rotation transmission clutch that only allows rotation transmission from the output rotation shaft 10 to the pinion 14. When the pinion 14 is reversely biased, the friction roller 11c
By freely rotating between the clutch outer 11b and the clutch outer 11b, power transmission from the pinion 14 to the output rotating shaft 10 is interrupted, and the rotating shaft 4 is driven under no load. After that, the plunger 2 of the electromagnetic switch device 20
By returning to 0a, the shift lever 15 moves to the arrow 21.
The pinion 14 is driven to rotate in direction b, and the pinion 14 is removed from the flywheel gear 19 via the clutch 11, and the main contact circuit (not shown) is opened, and the rotation of the rotating shaft 4 is stopped.

Note that when the pinion 14 is engaged with the flywheel gear 19 by operating the shift lever 15 as described above, the lever holder 16 supporting the shift lever 15 compresses the lever spring 18, so that the pinion 14 engages the flywheel gear 19. It meshes effortlessly.

The conventional starter is as described above, but in this starter, the rotating shaft 4 of the prime mover 1 and the output rotating shaft 1
By interposing the planetary gear reduction device 6 between the rotary shaft 4 and the output rotary shaft 10, the torque transmitted from the rotary shaft 4 to the output rotary shaft 10 is increased, making it easier to start the internal combustion engine, which takes time to start. There are drawbacks.

This invention was made to eliminate the above-mentioned drawbacks, and the reduction logic mechanism of the planetary gear reduction device is variable, that is, the rotational speed transmitted from the rotating shaft of the prime mover to its output rotating shaft is switched from a decelerating state to a non-decelerating state. It is an object of the present invention to provide a variable speed starter that performs a boost start of a driven device using its non-deceleration function, thereby shortening the start time.

Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 2 is a partially cutaway side view of a variable speed starter according to an embodiment of the invention. In this figure, the outer cylindrical portion 8a of the auxiliary plate 8 that supported the output rotating shaft 10 is connected to the housing 2 of the prime mover 1,
In addition, a planetary gear reduction device 6 is disposed within the outer circumferential cylindrical portion 8a.
An internal gear 6b is supported so as to be slidable and rotatable in the axial direction, that is, in the direction of arrow 13. Further, near the outer periphery of the intermediate bracket 3 that supports the front end 4a of the rotating shaft 4 of the prime mover 1, and on the outer periphery of the arm 6e of the planetary gear reduction gear 6, the internal gear 6b slides in the axial direction to select a gear. Locking portions (spur gears) 3a and 6g that lock together (mesh) are formed. In addition, in the following description, the locking parts 3a and 6g are called spur gears. An annular groove 6h is formed on the outer periphery of the internal gear 6b.
is formed, and the outer peripheral cylindrical portion 8 of the auxiliary plate 8
An oblong guide hole 8b that intersects the annular groove 6h is provided in the hole a. Said annular groove 6h
The tip of a shift pin 22 that slides in the direction of arrow 13 along the guide hole 8b is loosely fitted into the guide hole 8b. The rest of the structure is the same as the conventional structure shown in FIG. 1, so the same reference numerals are given here and the explanation thereof will be omitted.

Next, the operation of the above configuration will be explained. In FIG. 2, as described in FIG. 1, when the pinion 14 meshes with the flywheel gear 19 of the internal combustion engine and the rotating shaft 4 of the prime mover 1 rotates, the internal gear 6b of the planetary gear reduction device 6 rotates. The planetary gear 6c meshes with the spur gear 3a of the intermediate bracket 3, and is fixed to the intermediate bracket 3 as a fixed body by meshing with the spur gear 3a. That is, the planetary gear reduction device 6 is set to a deceleration state, and therefore the rotation of the rotating shaft 4 is decelerated by the original planetary motion of the planetary gear 6c and transmitted to the output rotating shaft 10. As a result, the internal combustion engine (not shown) starts and enters the first explosion state (incomplete start state). At the time of the first explosion, the shift pin 22 is driven in the direction of the arrow 13b by a hydraulic device (not shown), and the third
As shown in the figure, the internal gear 6b is disengaged from the spur gear 3a of the intermediate bracket 3, and is meshed with the spur gear 6g of the arm 6e while remaining in mesh with the planetary gear 6c, so that the rotating shaft 4, the planetary gear 6c, and the internal gear 6b , and the arms 6e are integrally connected. At this time, the internal gear 6b is released in the circumferential direction from the shift pin 22 by the annular groove 6h, and is in a state where it can freely rotate relative to the outer circumferential cylindrical portion 8a. In other words, the planetary gear reduction gear 6 is switched to a non-reduction state in which each part thereof rotates integrally. As a result, the rotating shaft 4 and the output rotating shaft 10
The rotational speed of the former 4 is transmitted to the latter 10 without being decelerated. In this way, the internal combustion engine described above is additionally started and quickly transitions from the initial explosion state to the complete explosion state. Therefore, the starting time of the internal combustion engine is shorter than in the conventional case.

Move the shift pin 22 in the position shown in FIG.
When the gear is returned to the direction a, a deceleration state is obtained in which the internal gear 6b meshes with the spur gear 3a on the intermediate bracket 3 side while remaining meshed with the planetary gear 6c, as shown in FIG.

In the above embodiment, an internal combustion engine is used as the driven device, but this invention can also be used as a starter for industrial equipment other than internal combustion engines, such as winches using DC motors.

As can be seen from the above explanation, according to the variable speed starter of this invention, the rotational speed transmitted from the rotating shaft of the prime mover to the output rotating shaft can be switched from a decelerating state to a non-decelerating state. This function provides an effect of shortening the starting time by performing a boost start of the driven moving device.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a conventional starter, Fig. 2 is a partially cutaway side view of a variable speed starter according to an embodiment of the invention, and Fig. 3 is an explanatory diagram of the operation of Fig. 2. . 1... Prime mover, 2... Housing, 3a... Locking part,
6... Planetary gear reduction device, 6b... Internal gear, 6
c...Planetary gear, 6d...Support pin, 6e...
Arm, 6g...Locking part, 10...Output rotating shaft. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a starter in which the rotation of the prime mover and its output rotating shaft are connected by a planetary gear reduction device, an internal gear meshed with the planetary gear of the planetary gear reduction device is provided rotatably and slidably in the axial direction, The internal gear is provided with a locking portion that slides while being meshed with the planetary gear and selectively locks the internal gear to the casing of the prime mover and the arm provided with the support pin of the planetary gear. A variable speed starter featuring: