JP3553102B2 - Recoil starter mounting structure for general-purpose engines - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a recoil starter mounting structure for a general-purpose engine.
[0002]
[Prior art]
A conventional example will be described with reference to FIGS. 5 to 7 as shown in Japanese Utility Model Publication No. 63-46695. 5 is a perspective view of a conventional brush cutter, FIG. 6 is a side sectional view of a main part of FIG. 5, and FIG. 7 is a perspective view of a conventional opening and a starter.
In the figure, A denotes a bush cutter, which is a working machine with a portable engine. An engine E connected to an end of the bush cutter A has the same configuration as that of the conventional type, but has an engine cover 3 on the outer peripheral side of the engine E. A circular opening 1 is formed in the opening, and a starting portion C is formed inside the opening 1 by fitting a fan 4 and a wheel body 6 having respective engagement pins 5 to a crankshaft 7. However, at four locations around the opening 1, engagement portions 8 having engagement grooves 8a opened in one circumferential direction and at the center side are similarly formed and configured.
[0003]
B denotes an entire starting device. A flange 10 is formed on a side surface of the device B protruding from an outer periphery of a recoil starter type handle 9 so as to match the opening 1 of the engine E, and is started inward from the flange 10. A rotatable body 11 is provided in which an engaging claw 11 ′ capable of engaging with the engaging pin 5 of the portion C is made to protrude and retract, and can be fitted inside the respective engaging portions 8 at four locations on the outer periphery of the flange 10. The projection 12 is formed by projecting.
[0004]
[Problems to be solved by the invention]
The prior art is characterized in that the recoil starter, which is a starting device, can be easily removed, and a cover can be attached instead of removing the recoil starter which becomes unnecessary during operation. For small portable or portable engines that are subject to these issues, bolts, etc., which are fastening parts, must be fixed to prevent the parts from coming off due to vibration and movement during operation, contact with other objects during use, etc. As a rule, in this conventional example, there is no processing for these problems, and it cannot be said that it lacks practicality. In addition, the fixing method using bolts and the like has problems in necessity of processing threaded parts and workability in assembling, which hinders rationalization.
[0005]
An object of the present invention is to solve the above-mentioned problems and to rationalize the assembling work without using bolts and the like, and it is easy to remove as in the conventional example, but firmly holds against vibration and shock during operation and movement. An object of the present invention is to provide a general-purpose engine recoil starter mounting structure.
[0006]
[Means for Solving the Problems]
The recoil starter mounting structure of the general-purpose engine according to the present invention includes a fixed claw (31) having a built-in corrugated plate spring (32) provided on the recoil starter, and an axial rotation direction and an axial direction mounted on the recoil starter mounting side crankcase (20). A groove (210) opened so that the fixing claw (31) of the recoil starter can enter from one end in the rotation direction, and the fixing claw is locked to the other end of the groove in the rotation direction. that the side walls (211) in shape equipped with a recoil starter is a manual starting device of a general-purpose engine ing and a recoil starter locking boss 21 which is integrally molded,
With the corrugated plate-like spring top protruding from the fixed claw top opening, the fixed claw of the recoil starter is inserted into the groove of the locking boss from the opened groove side and rotated in the rotating direction to fix the spring. The top of the corrugated plate spring protruding from the claw top enters the locking boss through the groove while being elastically deformed, and the fixed claw is biased by the elastic deformation of the side wall of the locking boss and the corrugated plate spring. characterized by being configured to lock the, preferably a chevron plate spring in which the wave-shaped spring has a recess in the central top portion, the fixing claws each side wall Kishibe (32 b) of該山shaped leaf springs , And the locking boss is provided with a protrusion which engages with the concave portion of the chevron plate-like spring .
[0007]
[Action]
When the fixing claw 21 of the recoil starter is inserted into the groove of the locking boss from the opening direction and the force is applied to the recoil starter and turned, the corrugated plate spring 32 provided on the fixing claw 21 is elastically deformed and the groove is deformed. Then, the fixed claw 31 comes into contact with the side wall of the locking boss 21 so that the stop position is determined, and the recoil starter is assembled while maintaining a sufficient holding force without play. When the recoil starter is turned by applying a force in a direction opposite to the above, the corrugated plate-like spring 32 is elastically deformed, so that the fixed claw 31 comes out of the groove and the recoil starter is removed.
[0008]
【Example】
An embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of a recoil starter mounting structure of a general-purpose engine according to an embodiment of the present invention, FIG. 2 (a) is an enlarged view of a portion X in FIG. 1, (b) is a sectional view taken along line BB in FIG. 1A is a cross-sectional view taken along the line AA in FIG. 1, FIG. 4B is a cross-sectional view taken along the line CC in FIG. 3, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. In the figure, reference numeral 20 denotes a crankcase, and 30 denotes a recoil starter, both of which are known. Reference numeral 21 denotes a locking boss provided on the crankcase 20 three times. Reference numeral 31 denotes a fixed claw provided on the recoil starter 30 at an interval equal to the interval between the locking bosses 21. Reference numeral 22 denotes a stopper rib provided on one side of the locking boss 21 in the radial direction. Reference numeral 32 denotes a corrugated plate spring provided on the fixed claw 31. Numeral 32a denotes a concave portion of the corrugated plate spring, which is a wave trough at the center of the corrugation of the corrugated plate spring 32. Reference numeral 21a denotes a rib which is a protrusion provided in the groove of the locking boss 21 at a center position in the circumferential direction in the radial direction and is aligned with the concave portion 32a of the corrugated plate spring. P is the engine rotation direction and the recoil starter rotation direction. R indicates the direction in which the recoil starter is turned after insertion at the time of assembly by an arrow.
[0009]
More specifically, as shown in FIGS. 2A and 2B, the plurality of fixed claws 31 provided on the outer periphery of the recoil starter 30 have the corrugated plate-like spring tops 32a protrude from the fixed claw top open portions as shown in FIGS. In the state, it is composed of a fixed claw 31 having a built-in corrugated plate spring 32, and the corrugated plate spring 32 is a chevron plate-shaped spring having a concave portion 32a at the central top.
As shown in FIGS. 1 (b), 3 (a) and 3 (b), a plurality of recoil starters are provided on the recoil starter mounting side crankcase 20 at intervals corresponding to the fixed claws. The stop boss 21 is opened in the axial direction and in the axial direction, and the groove 210 is opened so that the fixing claw 31 of the recoil starter can enter from one end in the rotational direction. The end is formed in a shape having a side wall 211 on which the fixing claw 31 is locked, and a protrusion 21a is provided on the inner wall of the upper surface to engage with the concave portion of the chevron plate spring.
[0010]
The operation of the above embodiment will be described. When the fixed claw 31 is aligned with the side of the locking boss 21 where the groove is open, and the recoil starter 30 is turned in the direction of arrow R, the top of the corrugated plate spring projecting from the top of the fixed claw is elastically deformed and the groove is formed. Further, the fixing claw 31 is fitted into the groove of the locking boss 21, and the corrugated plate spring 32 is elastically deformed so that the corrugated peak of the corrugated plate spring 32 goes over the rib 21 a and the concave portion 32 a of the corrugated plate spring becomes the rib 21 a. The fixed claw locks the recoil starter 30 by the side wall of the locking boss, and the fixed claw 31 comes into contact with the stopper rib 22 to stop the recoil starter. Thus, the recoil starter 30 is attached to the crankcase 20. When the recoil starter 30 is turned by applying a force in the opposite direction to the above, the peak of the waveform of the corrugated plate spring 32 loses the force and elastically deforms, rides over the rib 21a, the recoil starter 30 turns, and the fixed claw 31 is locked. The recoil starter 30 gets out of the boss 21 and comes off the crankcase 20.
[0011]
【The invention's effect】
The one-touch installation and removal of the recoil starter is possible without using bolts, etc., which are fastening parts, and it has a sufficient holding force against vibration during operation and impact during movement. The elimination of the bolts and the one-piece construction of each part can reduce the number of parts and reduce the weight and the number of assembly steps. Therefore, the present invention is a general-purpose engine capable of rationalizing the assembly work without using bolts and the like, and which is easy to remove as in the conventional example, but has a strong holding property against vibration and shock during operation and movement. Can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a recoil starter mounting structure of a general-purpose engine according to an embodiment of the present invention.
FIG. 2A is an enlarged view of a part X in FIG. (B) is BB sectional drawing in FIG.
FIG. 3A is a sectional view taken along line AA in FIG. (B) is CC sectional drawing in FIG.
FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1 in a state where the recoil starter according to the embodiment of the present invention is assembled.
FIG. 5 is a perspective view of a conventional brush cutter.
6 is a cross-sectional view of a main part of FIG. 5 of a conventional example.
FIG. 7 is a perspective view of a conventional opening and an activation device.
[Explanation of symbols]
20: Crank case, 21: Locking boss, 22: Stopper rib, 30: Recoil starter, 31: Fixed claw, 32: Corrugated plate spring.

Claims (2)

A fixing pawl having a built-in wave plate spring provided on the re-coil starter (32) (31), from engagement possible and the rotational direction end to the recoil starter mounting side crankcase (20) in the rotation direction and the axial direction A groove (210) opened so that the fixing claw (31) of the recoil starter can enter, and a side wall (211) on the other end side of the groove in the rotation direction, on which the fixing claw is locked. a recoil starter is a manual starting device of a general-purpose engine ing and a recoil starter locking bosses integrally molded (21),
With the corrugated plate-like spring top protruding from the fixed claw top opening, the fixed claw of the recoil starter is inserted into the groove of the locking boss from the opened groove side and rotated in the rotating direction to fix the spring. The top of the corrugated plate spring protruding from the claw top enters the locking boss through the groove while being elastically deformed, and the fixed claw is biased by the elastic deformation of the side wall of the locking boss and the corrugated plate spring. A recoil starter mounting structure for a general-purpose engine, wherein the recoil starter mounting structure is configured so as to be locked by a lock. The corrugated leaf spring is a mountain leaf spring having a concave portion at a central top, and a shore portion (32b) of the mountain leaf spring is located on both side walls of the fixed claw, and the mountain boss leaf spring is provided on the locking boss. 2. A recoil starter mounting structure for a general-purpose engine according to claim 1, wherein a protrusion is provided which engages with the concave portion .

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