JPS6235892Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an electronic control system for an engine starting device.

In the past, there was a starter motor of this kind before this improvement, as shown in FIG. In the figure, 1 is an overrunning clutch, 2 is a rotating shaft that is spline engaged with the overrunning clutch 1, and 2a
is a helical spline, and 2b is a bearing portion.
3 is the housing of the overrunning clutch 1;
3a is a helical spline disposed on the rear end of the inner periphery of the casing 3; 3b is an engagement groove for a shift lever (not shown) disposed on the outer periphery of the casing 3; 3c is an inner periphery of the casing 1. 4 is a roller, 5 is a pinion, and 5a is a cam section disposed at the rear end of the pinion 5. Together with the wedge-shaped cam section 3c, the wedge-shaped cam surface forms a wedge-shaped space. The engagement of the rollers 4 constitutes a one-way transmission function. Reference numeral 6 denotes a sleeve bearing fitted to the inner peripheral portion of the pinion 5, and is loosely fitted onto the rotating shaft 2 so as to be slidable back and forth.
7 is a stopper, and 8 is a ring, which has a locking mechanism for the overrunning clutch 1.

In the engine starting device having the above configuration, the overrunning clutch 1 is moved forward by the biasing of the shift lever (not shown), and the pinion 5 is engaged with the ring gear of the engine (not shown), and the rotating shaft 2 is rotated. The rotational force is overrunning clutch 1
The pinion 5 rotates the ring gear. The engine (not shown) is started by the above rotation, and while the biasing of the shift lever continues, the pinion 5 is over-rotated by the one-way transmission function of the overrunning clutch 1, and the rotating shaft 2 is reversely driven by the engine. prevent things from happening. Note that after the engine is started, the biasing force on the shift lever is released, the overrunning clutch 1 returns to its original position, and the mesh with the ring gear of the engine is released.

Conventional engine starting devices are configured as described above, so after the engine starts, the pinion of the overrunning clutch is reversely driven by the engine and over-speeds, causing drag torque (no-load torque) generated inside the clutch. If the over-rotation state continues for a long time due to reverse driving by the clutch, the drag torque gradually increases and the overrunning clutch function is impaired. Further, the drag torque is extremely large during a cold start, and when the engine is started incompletely, the engine starting device becomes the load side, which is harmful to starting the engine in a cold state.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes an electromagnetic clutch that engages with the rotating shaft and transmits power to the pinion, and the electromagnetic clutch is transferred by a shift lever. Another object of the present invention is to provide an engine starting device that facilitates electronic control of rotational force transmission by supplying power to a slip ring disposed on the electromagnetic clutch.

An embodiment of this invention will be described below with reference to Figures 2 and 3. In Figure 2, 9 is an electromagnetic clutch assembly which is spline-engaged with the helical spline 2a of the rotary shaft 2, 10 is a slip ring which is fixed by molding with a polymeric resin molded member 11 which is an electrically insulating member, and is fixed to the outer periphery of an annular yoke 12. 13 is a washer fitted to the outer periphery of the yoke 12, which, together with the slip ring 10, constitutes an engagement groove for a lever which will be described later. 14 is a coil wound inside the yoke 12, and a lead wire at one end is connected to the slip ring 10 to supply power, and the coil 14
The other end of the coil 12 is connected to the yoke 12 and is grounded.
Reference numeral 15 denotes a lining, which constitutes a friction surface when it comes into contact with the armature 16. Reference numeral 17 denotes a pinion, which is spline-engaged with the armature 16 at a spline 17a portion. Reference numeral 18 denotes a washer, and reference numeral 19 denotes a retaining ring which holds and retains a non-magnetic cover 20, which is fitted into the grooved portion of the pinion 17. Cover 2
Reference numeral 20 is a sleeve bearing 21 fitted to the inner peripheral surface of the yoke 12 and supports the outer peripheral end of the pinion 17. FIG. 3 is an external view of the electromagnetic clutch assembly 9 having the cross section of FIG. 2, and shows a configuration diagram of a control mechanism actuated by a shift lever 22. Reference numeral 22 is a lever molded from a polymer resin member, and a metal ring 23 constituting an electrode structure is fixed to the end thereof, which abuts against the slip ring 10 when the lever 22 is actuated. Reference numeral 24 is a control device, and an output terminal of a lead wire is connected to the metal ring 23, and a power input terminal is connected to a key switch 25. Reference numeral 24a is an input terminal for a rotation speed signal of an engine (not shown), which is input to the control device 24.

Note that the lining 15 and the armature 16 constitute a power joint.

The operation of the engine starting device according to one embodiment of the invention having the above configuration will be explained using the timing chart shown in FIG. When the key switch 25 is closed, the shift lever 22 is rotated by the bias of an engagement switch (not shown), and the metal ring 23 at the end comes into contact with the slip ring 10, and the electromagnetic clutch assembly 9
is advanced, and the pinion 17 is engaged with the ring gear of the engine (not shown) [Fig. 4a]. After the pinion 17 is engaged, a DC motor (not shown) is energized and the rotating shaft 2 is rotated. At this point, the coil 14 is energized by the control device 24 via the metal ring 23 and the slip ring 10, the yoke 12 is magnetized, the armature 16 is attracted and comes into contact with the lining 15, and the electromagnetic crack assembly 9 is engaged. state,
The rotational force is transmitted to the pinion 17 to start an engine (not shown) [Fig. 4b]. After starting the engine (not shown), the control device 24 detects the rotational speed of the engine, and the electromagnetic clutch assembly 9 is disengaged at point A in FIG. 4, causing the pinion 17 engaged with the engine to over-rotate. The rotating shaft 2 is rotated under no load by being energized by a DC motor (not shown). If the engine stops (engine stall) again when the electromagnetic clutch assembly 9 is engaged with the engine but not engaged, the control device 24 detects the stopped state again and the electromagnetic clutch assembly 9 The coil 14 is energized and engaged, and the rotational force of the rotary shaft 2 urges the pinion 17 again to start cranking the engine.

In the above embodiment, the engaging portion of the electromagnetic clutch assembly 9 is of a friction plate type.
Other types of structures such as a multi-plate clutch, a powder clutch, and a pawl clutch may also be used.

As described above, according to this invention, the coil is energized by the shift lever via the slip ring disposed on the electromagnetic clutch, and this energization is controlled intermittently based on the engine rotational speed signal. This configuration has the effect of providing an engine starting device that operates reliably, has no drag torque, and is easy to electronically control.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a conventional engine starting device, FIG. 2 is a partial sectional view of an engine starting device according to an embodiment of this invention, and FIG. 3 is a configuration diagram of the control mechanism of the engine starting device shown in FIG. , FIGS. 4a, 4b, and 4c are timing charts of an engine starting device according to an embodiment of this invention. In the figure, 1 is an overrunning clutch, 2 is a rotating shaft, 2a is a helical spline, 5 and 17
9 is a pinion, 9 is an electromagnetic clutch assembly, 10 is a slip ring, 11 is a polymer resin molded member,
12 is a yoke, 14 is a coil, 15 is a lining, 16 is an armature, 19 is a retaining ring, 22 is a shift lever, 23 is a metal ring, 24 is a control device, 2
4a is a rotation signal input terminal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A rotating shaft rotationally driven by an electric motor, an electromagnetic clutch assembly mounted to be movable in the axial direction with respect to the rotating shaft and to transmit rotation, and movable in the axial direction together with the electromagnetic clutch assembly. A pinion is provided on the outer periphery of the electromagnetic clutch assembly and is connected to one end of a coil in the electromagnetic clutch. a slip ring, a shift lever having an electrode portion abutting the slip ring, and for moving the electromagnetic clutch assembly in the axial direction; connected to the electrode portion of the shift lever;
An engine starting device comprising: a control device that cuts off and on the power supply to the shift lever based on a rotational speed signal of the engine.