JPS6248062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a shift mechanism of an engine starting magnetic switch used in a pinion shift mechanism of an internal combustion engine starting device.

Conventionally, there has been a device of this type as shown in FIG. In the figure, 1 is a magnetic switch;
Reference numeral 2 denotes a movable iron core, and a pinion transfer lever 3 that engages with a groove 2a is provided. This pinion transfer lever 3 is provided with a movable support point.
Reference numeral 4 denotes a return spring, which is inserted into the outer peripheral portion of the rod 5 which is press-fitted into the recess 2b of the movable iron core 2. 6 is a movable contact shaft, and case 8
The rod 5 is slidably fitted into a fitting hole 7a of a fixed iron core 7 fixed to the rod, and as the movable iron core 2 moves, the end of the rod 5 comes into contact and slides under pressure. 9 is an electromagnetic coil wound around the bobbin 10, and 11 is a metal bush that is inscribed in the bobbin 10 and fixed to the fixed iron core 7. 12 is a non-magnetic metal bushing fitted into the front end opening of the case 8;
An appropriate magnetic gap between the movable core 2 and the case 8 is obtained, and sliding properties and vibration resistance characteristics are improved. Reference numeral 13 designates a plate, which is fitted into the case 8 through a burring portion 13a, and further provided with a protruding portion 13b by press molding to serve as a stopper mechanism for preventing the movable core 2 from coming off. 1
4 is a front bracket to which the magnetic switch 1 is fixed. 15 is the lever 3 above
The holder supports the front bracket 14 and is slidably fitted into a recess provided in the front bracket 14. 1
A coil spring 6 presses the holder 15. Reference numeral 17 denotes a gasket made of a synthetic rubber member or the like, which receives the pressure of the spring 16. 18 is a center bracket that fits into the front bracket 14, and 19 is a yoke of a DC motor, which is fitted and fixed to the center bracket 18. Reference numeral 20 denotes an output shaft of the DC motor, which is supported by a ball bearing 21 fitted into the center bracket 18, and has a spur gear formed at its end 20a. Reference numeral 22 denotes a spur gear, which has a spline 22a on its inner circumferential portion and is engaged with the shaft 23 through the spline. The shaft 23 is supported by a flat washer 24 and a sleeve bearing 25 fitted into the center bracket 18. 26 is a washer, 27 is a retaining ring, 28 is a cover screwed to the center bracket 18, and the shaft 2
3, it has a locking mechanism. 29 is the above axis 2
3 is an overrunning clutch that is spline engaged, 30 is a housing that is helical spline engaged with the shaft 23, 31 is a roller, 32 is a washer, 33 is a plate, and 34 is a cover, which is fixed to the housing 30 by caulking. be done. Reference numeral 35 denotes a sleeve, into which a sleeve bearing 36 is fitted, and which is connected to the shaft 2.
3 so as to be slidable. sleeve 3
5, the outer end surface 35a constitutes a cam surface of the overrunning clutch, and the overrunning clutch function is achieved by engagement with the wedge-shaped space formed by the casing 30 and the roller 31 disposed in the space. play. A ball bearing 37 is fitted into the front bracket 14 and supports the sleeve 35 in a loose manner. 38
The thrust spline 38a is spline-engaged with the sleeve 35 at a thrust spline 38a cut inside by a pinion. 39 is a stopper, and 40 is a ring, which constitutes a mechanism for positioning the pinion 38 and preventing it from coming off. 41 is a compression spring for shock absorption.

Next, the operation of the magnetic switch mechanism having the above configuration will be explained. Now, when a key switch of a mechanism (not shown) is closed and the electromagnetic coil 9 is energized, the movable core 2 is attracted to the fixed core 7 against the spring 4. At this time, the lever 3 rotates around the holder 15, which serves as a fulcrum, and advances the overrunning clutch 29, which causes the pinion 38 to advance and engage a ring gear of a mechanism (not shown). At this time, the movable iron core 2 presses the contact shaft 6 to close a main contact (not shown), and generates rotational force in the shaft 20 by energizing the DC motor. The rotational force is applied to the pinion 3 through the spur gears 20a, 22, the shaft 23, the overrunning clutch 29, and the sleeve 35.
8 to start an engine (not shown).
At this time, when the pinion 38 comes into contact with the end face of the ring gear (not shown) and does not engage, the suction force of the movable iron core is applied to the spring 1 via the lever 3 and the holder 15.
6 is pressed and deflected, and the movable iron core 2 moves into the movable contact shaft 6.
Therefore, the main contact (not shown) is closed, applying rotational force to the pinion 38, and the pinion 38 is rotated to a position where it can mesh with the ring gear of the engine (not shown), so that it can mesh with the ring gear. becomes. After the engine is started, the bias of the electromagnetic coil 9 is released, and the helical spline that engages the spring 4, shaft 23, and overrunning clutch 29 is activated by the screw action caused by the pinion 38 being reversely driven by the ring gear of the engine. The pinion 38 returns to its original position due to the restoring force. Since the conventional shift mechanism using a magnetic switch is constructed as described above, the structure of the fulcrum part of the lever 3 is complicated, and in order to obtain the pressing force to engage the pinion 38 with the ring gear, and the overrunning clutch at the time of shifting. The reaction force of the attractive force of the movable iron core 2 generated on the lever 3 by the inertial force of the lever 29 is magnified and transmitted to the lever spring 16, and is pressed. Conventional products have a shear stress of 100
It had shortcomings in durability when used in high stress conditions of around Kg/ ^mm2 . Further, it requires a complicated structure that allows the fulcrum part of the lever 3 to slide in the front and back direction, and requires a special sealing structure using the gasket 17, resulting in an increase in manufacturing costs.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the hook member of the pinion transfer lever, which is engaged with a spring inside the movable iron core, is slidably disposed. The holder, which is the fulcrum member of the front bracket, is no longer required, and the second spring force that engages the hook member can be used with less stress and shear stress than before, improving reliability in terms of durability and improving the structure of the front bracket. Easy to manufacture, and
By installing the first spring between the movable iron core and the fixed iron core and on the inner circumference of the electromagnetic coil,
The purpose of the present invention is to provide a magnetic switch for starting an engine that can be installed compactly by effectively utilizing the installation space of a spring.

An embodiment of the invention will be described below with reference to FIG. In FIG. 2, 52 is a magnet switch, 53 is a fixed iron core that forms a magnetic path when the electromagnetic coil 9 is energized, and is an inscribed portion 5 of the electromagnetic coil 9.
8a is stepped, and a first spring 54 in the form of a cylindrical coil is disposed in the stepped portion. 5
5 is a movable core that is attracted toward the fixed core 53 by the biasing force of the electromagnetic coil 9; 56 is a hook assembly forming a hook member; A sleeve 57 whose front end engages with the pinion transfer lever 48 is formed. 59 is the sleeve 57 and the shaft 5
8 is a caulking pin that engages the movable iron core 5, and 60 is the movable iron core 5.
5 is a cylindrical coil-shaped second spring mounted inside the movable core 55, which presses the seat surface 58a provided at the rear end of the movable core 55 and the shaft 58, and normally pushes the hook member 56 against the movable core 55. fixed core 53
It is in contact with the side end surface. A washer 61 is brought into contact with the bottom of the movable core 55 and is brought into contact with the end 58a of the hook member 56, and presses the movable contact shaft 6 when the movable core 55 is attracted. Reference numeral 50 denotes a support pin for the lever 48, and this pin is pivotally supported by a front bracket 51, so that the support point of the lever 48 is rotatable. Note that the diameter of the first spring 54 is set to be larger than the diameter of the second spring 60.

Next, the operation of the apparatus of the above embodiment will be explained.
Now, the attractive force generated in the movable iron core 55 by the energization of the electromagnetic coil 9 is applied to the first and second springs 54 and 6.
0, and the reaction force of the second spring is transmitted to the hook member 56. The above suction force is the sleeve 57
The pinion 38 is engaged with the ring gear. When the pinion 38 comes into contact with a ring gear (not shown) at its end face and does not engage, the second spring 60 is further deflected, and the movable iron core 5
5 is attracted to the fixed iron core 53, presses the movable contact shaft 6, and closes the main points (not shown). The DC motor (not shown) energized at this time generates a rotational force, which is applied to the pinion 38, and when the pinion 38 is rotated until the meshing position with the ring gear is determined, the ring gear and pinion are rotated. 38 meshes. Due to the engagement of the pinion 38, the hook member 56 is returned to its original position via the lever 48 by the pressing force of the second spring 60. After starting the engine (not shown), the bias of the electromagnetic coil 9 is released, and the pinion 38 and the movable iron core 55 are returned to their original positions by the return force of the first spring 54. In addition,
The above operation is performed by the pinion 38 depending on the shift amount of the lever.
A similar effect can be achieved by a structure in which the main contact is closed at the position where the main contact contacts the end face of the ring gear.

Note that although the spring force of the second spring 60 is set to be greater than that of the first spring 54 in the above example, it is assumed that the spring force of the second spring 60 and the first spring 54 are set to be the same. Alternatively, even if the first spring 54 is set to have a larger spring force than the second spring 60, the same effects as in each of the above embodiments can be obtained.

As described above, the present invention includes a hook member that is provided to be slidable in the axial direction within the movable core, is restricted from moving toward the fixed core, and has one end connected to a pinion transfer lever having a fixed support point;
A second spring is provided in the movable core to press and support the hook member up to the fixed core side end surface of the movable core, and when the electromagnetic coil is energized and the movement of the pinion transfer lever is restricted, the movable core is attracted to the fixed core side against the first and second springs, and as the movable core moves, the movable contact member is pressed and moved. There is no need to provide a lever spring that performs the same action as the spring in step 2, and since the fulcrum part of the pinion transfer lever can also be fixed, a holder can also be dispensed with, which simplifies the structure of the fulcrum part of the pinion transfer lever. This eliminates the need for a conventional sealing structure using a gasket.Furthermore, since a second spring is provided within the movable core that can function in the same way as a conventional lever spring, it Since the installation space for the second spring can be made larger than that of the spring, springs with lower spring stress can be used than conventional springs, and the durability of the second spring can therefore be improved. ,Moreover,
By installing the first spring between the movable iron core and the fixed iron core and on the inner circumference of the electromagnetic coil, the installation space for the first spring can be used effectively.
Moreover, by making the diameter of the first spring larger than the diameter of the second spring, the length of the second spring during suction of the movable core can be reduced, which has the advantage of making the device more compact. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view for explaining a conventional shift mechanism of an engine starting device, and FIG. 2 is a sectional view for explaining a magnetic switch having a shift mechanism according to an embodiment of the present invention. In the figure, 2 and 55 are movable cores, 3 and 4
8 is a pinion transfer lever, 4 is a movable core return spring, 6 is a movable contact shaft, 7 and 53 are fixed cores, 9 is an electromagnetic coil, 14 and 51 are front brackets, 15 is a holder, 16 is a lever spring, 29 is an over Running clutch, 38 is a pinion, 54 is a first spring, 60 is a second
, 56 is a hook assembly, 57 is a sleeve, and 61 is a washer. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An electromagnetic coil, a fixed core that can form a part of the magnetic path when the electromagnetic coil is energized, a movable contact member that is provided to be slidable in the axial direction on the inner circumference of the fixed core and has a contact at one end; A movable core that is provided to face the fixed core in the axial direction and is attracted toward the fixed core as the electromagnetic coil is energized; A first spring in the form of a cylindrical coil that can be mounted to suppress the suction of the movable core, is provided to be slidable in the axial direction within the movable core, and movement toward the fixed core is restricted, and one end is connected to a support point. a hook member connected to a pinion transfer lever to which is fixed; and a second spring in the form of a cylindrical coil that presses and supports the hook member within the movable core up to an end surface on the fixed core side of the movable core; The diameter of the first spring is configured to be larger than the diameter of the second spring, and when the electromagnetic coil is energized and movement of the pinion transfer lever is restricted, the movable iron core moves between the first and second springs. A magnetic switch for starting an engine, wherein the movable core is attracted toward the fixed core against the spring of the magnet, and the movable core presses and moves the movable contact member.