Intermediate wheel gear-reduction starter based on direct ejection type starting

Abstract

The utility model relates to an intermediate wheel speed reduction starter based on direct ejection type starting, which comprises a shell, an armature, a middle cover and a front cover, an isolator is arranged in a space enclosed by the front cover and the middle cover, a switch cavity is arranged on the middle cover at the rear end of the isolator, a coil assembly is arranged in the switch cavity, a switch iron core is arranged in the coil assembly, and the switch iron core is connected with the armature. The front end of the switch iron core is provided with an integrated ejector rod, a driving gear in meshing transmission with an engine flywheel is installed at the front end of a spline shaft of the isolator, the front end of the armature is provided with a shaft end gear, and the shaft end gear is in meshing transmission with a straight tooth spline on the periphery of the isolator through an intermediate gear to drive the spline shaft to rotate. When the coil assembly is powered on, the switch iron core pushes the spline shaft to rapidly move forwards through the ejector rod to achieve meshing transmission of the driving gear and an engine flywheel. The coil assembly of the electromagnetic switch is directly arranged in the middle cover, parts such as a switch shell and a switch cover are omitted, the structure is compact, and the manufacturing cost of the starter is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of starters, in particular to an intermediate wheel reduction starter based on direct-top starting. Background Art

[0002] In the conventional deceleration starter structure, the movement of the drive gear is achieved through the shift fork. The lower end of the shift fork is clamped on the one-way device, and the upper end hooks the iron core head of the electromagnetic switch, forming a lever structure. When the electromagnetic switch is energized, the iron core pulls the upper end of the shift fork backward, and the lower end of the shift fork moves forward, pushing the one-way device forward, so that the drive gear at the end of the one-way device moves forward and engages with the engine flywheel, thereby driving the engine to work.

[0003] Since a shift fork is used to push out the one-way device, a separate set of electromagnetic switches must be set up to cooperate with the starter. The entire set of electromagnetic switches contains many parts, such as a switch housing, a switch cover, etc., which also causes the production cost of the starter to increase accordingly. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides an intermediate wheel reduction starter based on direct top starting which has a compact structure and is conducive to reducing product costs.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an intermediate wheel reduction starter based on direct top starting, comprising a casing, an armature installed in the casing, a middle cover fixed to the front end of the casing, and a front cover fixed to the middle cover, a one-way device is installed in the space surrounded by the front cover and the middle cover, the middle cover at the rear end of the one-way device has a switch cavity, a coil assembly is provided in the switch cavity, a switch iron core is provided in the coil assembly, the front end of the switch iron core has an integral structure of the top rod, a driving gear meshing with the engine flywheel is installed at the front end of the spline shaft of the one-way device, the front end of the armature has a shaft end gear, the shaft end gear drives the spline shaft to rotate through the meshing transmission of the intermediate gear and the spur spline on the outer periphery of the one-way device, when the coil assembly is energized, the switch iron core pushes the spline shaft forward quickly through the top rod to realize the meshing transmission of the driving gear and the engine flywheel.

[0006] In order to ensure that the coil assembly is firmly installed, a bracket is fixed on the inner wall surface of the switch cavity by pressing and cutting, and the coil assembly is installed in the bracket.

[0007] A spring sleeved on the push rod is provided between the front end of the switch core and the rear end face of the spline shaft, so that the front end of the push rod is kept pressed against the rear end face of the spline shaft.

[0008] Furthermore, an intermediate shaft is fixed on the middle cover, and the intermediate gear is rotatably arranged on the intermediate shaft.

[0009] In order to keep the interior of the switch cavity clean, a protective cover is fixedly connected to the rear end surface of the switch cavity.

[0010] The beneficial effects of the present invention are as follows: the present invention directly embeds the coil assembly and other components of the electromagnetic switch in the middle cover, eliminating components such as a switch housing and a switch cover, resulting in a compact structure and saving the manufacturing cost of the starter. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0012] Figure 1 It is a structural diagram of the present utility model.

[0013] Figure 2 It is a schematic diagram of the installation structure of the coil assembly in the utility model.

[0014] Figure 3 It is a structural schematic diagram of the middle cover of the present utility model.

[0015] In the figure: 1. Casing, 2. Armature, 3. Middle cover, 4. Front cover, 5. Isolator, 6. Switch chamber, 7. Coil assembly, 8. Switch core, 9. Push rod, 10. Drive gear, 11. Spline shaft, 12. Shaft end gear, 13. Intermediate gear, 14. Spur spline, 15. Bracket, 16. Spring, 17. Intermediate shaft, 18. Protective cover. DETAILED DESCRIPTION

[0016] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0017] like Figures 1 to 3 The intermediate wheel reduction starter based on direct top starting shown includes a casing 1, an armature 2 installed in the casing 1, a middle cover 3 fixed to the front end of the casing 1, and a front cover 4 fixed to the middle cover 3. The front end of the armature shaft of the armature 2 has a shaft end gear 12 with an integrated structure.

[0018] A one-way device 5 is rotatably installed in the space enclosed by the lower edge of the front cover 4 and the middle cover 3. The one-way device 5 includes a housing, and the front and rear ends of the housing are rotatably supported between the front cover 4 and the middle cover 3 by bearings. A spline shaft 11 is provided in an inner hole across the housing, and a drive gear 10 that meshes with the engine flywheel is installed at the front end of the spline shaft 11. A straight spline 14 of an integral structure is provided on the outer periphery of the housing of the one-way device 5 at the rear end of the spline shaft 11. An intermediate shaft 17 is fixed on the middle cover, and an intermediate gear 13 is rotatably installed on the intermediate shaft 17. The shaft end gear 12 is meshed with the straight spline 14 through the intermediate gear 13, thereby driving the spline shaft 11 to rotate and drive the drive gear 10 to rotate.

[0019] The switch assembly for pushing the one-way switch 5 out is installed in the middle cover 3, and the switch assembly includes a coil assembly 7 and a switch core 8. The middle cover 3 located at the rear end of the one-way switch 5 is provided with a switch cavity 6. A bracket 15 is fixed to the inner wall surface of the switch cavity 6 by pressing and cutting. The coil assembly 7 is installed in the bracket 15, and the switch core 8 is arranged in the coil assembly 7. The front end of the switch core 8 has an integral structure of a push rod 9. The front end of the push rod 9 is close to the rear end of the spline shaft 11. A spring 16 is provided between the front end face of the switch core 8 and the rear end face of the spline shaft 11. The front end of the push rod 9 is kept pressed against the rear end face of the spline shaft 11 by the action of the spring 16. The rear end face of the switch cavity 6 is fixed with a protective cover 18.

[0020] The coil assembly 7 comprises an inner pull-in coil and an outer retaining coil. The middle cover 3 has mounting holes for lead screws, through which lead screws for terminals B, M, and S are inserted. L-shaped contact pieces are mounted on the M and B terminals within the middle cover 3, which contact and conduct electricity with the electromagnetic switch's moving contact disc. When the electromagnetic switch assembly's S terminal is connected, the pull-in coil is energized, the moving contact disc engages the L-shaped contact piece, and the switch core 6 is driven out while the coil remains energized, keeping the drive gear 10 in the driven position and meshing with the flywheel.

[0021] The utility model directly installs the coil assembly 7 and other components of the electromagnetic switch in the middle cover 3. When the switch core 8 is driven out, the push rod 9 pushes the rear end of the spline shaft 11 forward, causing the spline shaft 11 to rotate and drive the drive gear 10 out of the front cover 4 to engage with the flywheel; then the M terminal is connected to rotate the armature 2, and the shaft end gear 12, the intermediate gear 13 and the straight tooth spline 14 are engaged and transmitted, thereby driving the one-way device 5 to rotate; when the electromagnetic switch is powered off, the return spring provided in the switch core 8 pushes the switch core 8 to retract, causing the drive gear 10 to return to its original position, completing a starting process.

[0022] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. An intermediate wheel reduction starter based on direct top starting, comprising a housing (1), an armature (2) mounted in the housing (1), a middle cover (3) fixed to the front end of the housing (1), and a front cover (4) fixed to the middle cover (3), wherein a check valve (5) is mounted in a space enclosed by the front cover (4) and the middle cover (3), and wherein: The middle cover (3) at the rear end of the one-way device (5) is provided with a switch cavity (6), a coil assembly (7) is provided in the switch cavity (6), a switch core (8) is provided in the coil assembly (7), the front end of the switch core (8) is provided with a push rod (9) of an integral structure, a driving gear (10) meshing with the engine flywheel is installed at the front end of the spline shaft (11) of the one-way device (5), the front end of the armature (2) is provided with a shaft end gear (12), the shaft end gear (12) meshes with the spur spline (14) on the outer periphery of the one-way device (5) through an intermediate gear (13) to drive the spline shaft (11) to rotate, and when the coil assembly (7) is energized, the switch core (8) pushes the spline shaft (11) to move forward quickly through the push rod (9) to achieve meshing transmission between the driving gear (10) and the engine flywheel.

2. The intermediate wheel reduction starter based on direct top starting according to claim 1 is characterized in that: A bracket (15) is fixed on the inner wall surface of the switch cavity (6) by means of pressing and cutting, and the coil assembly (7) is installed in the bracket (15).

3. The intermediate wheel reduction starter based on direct-start as claimed in claim 1, characterized in that: A spring (16) sleeved on the push rod (9) is provided between the front end of the switch iron core (8) and the rear end surface of the spline shaft (11).

4. The intermediate wheel reduction starter based on direct-start as claimed in claim 1, characterized in that: An intermediate shaft (17) is fixed on the middle cover, and the intermediate gear (13) is rotatably arranged on the intermediate shaft (17).

5. The intermediate wheel reduction starter based on direct-starting as claimed in claim 1 is characterized in that: A protective cover (18) is fixedly connected to the rear end surface of the switch cavity (6).

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