Split type transmission structure of starter shaft gear

Abstract

The utility model relates to a starter shaft gear split type transmission structure, a starter comprises a rotor, an eccentric middle cover, a planet carrier and an isolator, the rotation center of the rotor is eccentric to the rotation center of the planet carrier, a rotor shaft is installed at the center of the rotor, the planet carrier with an inner gear ring is installed at the rear end of a center shaft of the isolator, and the planet carrier is provided with an outer gear ring. A shaft gear is rotationally installed on the eccentric middle cover, the front end of the shaft gear is in meshing transmission with an inner gear ring of the planet carrier, four axial inserting grooves which are evenly distributed in the circumferential direction are formed in the rear end of the shaft gear, the front end of a rotor shaft is in clearance fit with an inner hole of the shaft gear, and four axial keys which are evenly distributed in the circumferential direction are inserted into the front end face of an iron core of the rotor. And the front end of the axial key is correspondingly inserted into the axial slot. According to the utility model, the axial key is matched with the axial slot in an inserting manner, so that the power transmission is realized, the manufacturing process of parts is simplified, the installation is convenient, the whole rotor does not need to be replaced even if the shaft gear is damaged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of starters, in particular to a starter shaft and gear split transmission structure. Background Art

[0002] When the starter is started, the rotor rotates, driving the shaft gear installed on the rotor shaft to rotate. The shaft gear engages with the planetary gear carrier installed on the one-way device to rotate. Then the electromagnetic switch pushes the shift fork to knock out the rotating one-way device, and the drive gear engages with the ring gear on the engine shaft to start the engine.

[0003] In the current conventional structure of the starter, the installation method of the shaft gear is: first, the tooth shape is processed on the end of the rotor shaft to form a shaft gear with an integrated structure with the rotor shaft. However, if the shaft gear is worn out after long-term use, the shaft gear cannot be replaced alone, and the entire rotor shaft can only be replaced, resulting in high maintenance costs; second, a spline is processed on the end of the rotor shaft, and a keyway hole is processed on the inner hole of the shaft gear accordingly, and the keyway is used to realize the rotation of the rotor shaft driving the shaft gear. This installation structure makes the parts processing process complicated and increases the product cost. Utility Model Content

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a starter shaft gear split transmission structure which has a simple structure, is easy to disassemble and is conducive to reducing product costs.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a starter shaft gear split transmission structure, the starter includes a rotor, an eccentric upper cover, a planetary gear carrier and a one-way device, the rotor rotation center is eccentric to the planetary gear carrier rotation center, the rotor center is equipped with a rotor shaft, the rear end of the center shaft of the one-way device is rotatably supported on the eccentric upper cover, the planetary gear carrier with an inner gear ring is installed on the rear end of the center shaft of the one-way device, the eccentric upper cover is rotatably equipped with a shaft gear through a needle bearing, the front end of the shaft gear is meshed with the inner gear ring of the planetary gear carrier for transmission, the rear end of the shaft gear is provided with four circumferentially evenly distributed axial slots, the front end of the rotor shaft is gap-matched with the inner hole of the shaft gear, the front end surface of the iron core of the rotor is inserted with four circumferentially evenly distributed axial keys, the front ends of the axial keys are correspondingly inserted into the axial slots.

[0006] The shaft gear includes a toothed portion at the front end and a connecting portion at the rear end. The toothed portion is meshed with the inner gear ring of the planetary wheel carrier for transmission. The outer periphery of the connecting portion is matched with the inner ring of the needle roller bearing. The axial slot is opened on the annular surface at the rear end of the inner hole of the connecting portion.

[0007] A shaft retaining ring is embedded on the outer periphery of the rear end of the connecting part protruding from the rear end surface of the eccentric middle cover, and a friction-reducing washer is arranged in contact with the rear end surface of the eccentric middle cover. A flat washer is arranged between the friction-reducing washer and the shaft retaining ring.

[0008] The axial key is a rectangular body, and four rectangular slots evenly distributed circumferentially are opened on the front end surface of the rotor core. The rear end of the axial key is fixed in the rectangular slot, and the front end of the axial key is plugged into the corresponding axial slot.

[0009] The beneficial effects of the present invention are as follows: the present invention transmits power to the one-way device through the planetary gear carrier through the plug-in cooperation between the axial key fixed to the end face of the rotor core and the axial slot provided at the rear end of the shaft gear, thereby driving the driving gear at the front end of the one-way device to rotate. This simplifies the manufacturing process of components such as the shaft gear and the axial key, facilitates installation, and has a compact transmission structure. Even if the shaft gear is damaged, there is no need to replace the entire rotor, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0011] Figure 1 It is a structural diagram of the present utility model.

[0012] Figure 2 It is a structural diagram of the shaft gear described in the utility model.

[0013] Figure 3 yes Figure 2 Right view of .

[0014] Figure 4 It is a schematic diagram of the installation structure of the axial key of the utility model.

[0015] In the figure: 1. Rotor, 2. Eccentric center cover, 3. Planetary gear carrier, 4. One-way device, 5. Rotor shaft, 6. Needle roller bearing, 7. Shaft gear, 7-1. Toothed portion, 7-2. Connecting portion, 8. Axial slot, 9. Axial key, 10. Shaft retaining ring, 11. Friction-reducing washer, 12. Flat washer. 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 Figure 1 The figure shows a starter shaft-gear split transmission structure, which includes a rotor 1, an eccentric middle cover 2, a planetary wheel carrier 3 and a one-way device 4. The rotation center of the rotor 1 is located below the rotation center of the planetary wheel carrier 3. The rotor shaft 5 is mounted on the center of the iron core of the rotor 1 via a flat key. The rear end of the central shaft of the one-way device 4 is rotatably supported in the shaft hole at the center position of the eccentric middle cover 2 via a bearing. The planetary wheel carrier 3 with an internal gear ring is fixed to the rear end of the central shaft of the one-way device 4.

[0018] like Figures 1 to 3 As shown, a needle roller bearing 6 is installed in the inner hole of the eccentric middle cover 2 located below the central axis of the one-way device 4, and a shaft gear 7 is rotatably installed in the inner ring of the needle roller bearing 6. The shaft gear 7 includes a toothed portion 7-1 located at the front end and a connecting portion 7-2 at the rear end, wherein the toothed portion 7-1 is meshed with the inner gear ring of the planetary wheel carrier 3 for transmission, and the outer periphery of the connecting portion 7-2 is matched with the inner ring of the needle roller bearing 6, and the front end of the rotor shaft 5 is gap-inserted into the inner hole of the shaft gear 7.

[0019] Four axial slots 8 are evenly distributed circumferentially on the annular surface at the rear end of the connecting portion 7-2 of the shaft gear 7. Four rectangular slots are evenly distributed circumferentially around the rotor shaft 5 on the front end surface of the iron core of the rotor 1. An axial key 9 in the shape of a rectangular body is fixed in each rectangular slot. Figure 4 As shown, the inner sides of the four axial keys 9 are in contact with the outer periphery of the rotor shaft 5 , and the front ends of the axial keys 9 are correspondingly inserted into the axial slots 8 .

[0020] In order to prevent the shaft gear 7 from moving toward the front cover of the starter, a shaft retaining ring 10 is embedded on the outer periphery of the rear end of the connecting part 7-2 protruding outside the rear end surface of the eccentric middle cover 2, and a friction-reducing washer 11 is provided in contact with the rear end surface of the eccentric middle cover 2, and a flat washer 12 is provided between the friction-reducing washer 11 and the shaft retaining ring 10.

[0021] The utility model transmits the rotational power of the rotor 1 to the one-way device 4 through the planetary gear carrier 3 through the plug-in cooperation between the axial key 9 fixed to the end face of the iron core of the rotor 1 and the axial slot 8 provided at the rear end of the shaft gear 7, thereby driving the driving gear at the front end of the one-way device 4 to rotate. In this way, the manufacturing process of parts such as the shaft gear 7 and the axial key 9 is simplified, and the installation is convenient. The transmission structure is compact. Even if the shaft gear 7 is damaged, there is no need to replace the entire rotor 1, thereby reducing maintenance costs.

[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. A starter shaft gear split transmission structure, the starter comprising a rotor (1), an eccentric upper cover (2), a planetary wheel carrier (3) and a one-way device (4), wherein the rotation center of the rotor (1) is eccentric to the rotation center of the planetary wheel carrier (3), a rotor shaft (5) is mounted at the center of the rotor (1), the rear end of the central shaft of the one-way device (4) is rotatably supported on the eccentric upper cover (2), and the planetary wheel carrier (3) having an inner gear ring is mounted on the rear end of the central shaft of the one-way device (4), and the starter is characterized by: A shaft gear (7) is rotatably mounted on the eccentric middle cover (2) via a needle bearing (6); the front end of the shaft gear (7) is meshed with the inner gear ring of the planetary gear carrier (3) for transmission; the rear end of the shaft gear (7) is provided with four axial slots (8) evenly distributed in the circumferential direction; the front end of the rotor shaft (5) is clearance-matched with the inner hole of the shaft gear (7); the front end surface of the iron core of the rotor (1) is inserted with four axial keys (9) evenly distributed in the circumferential direction; the front ends of the axial keys (9) are correspondingly inserted into the axial slots (8).

2. The starter shaft gear split transmission structure according to claim 1, characterized in that: The shaft gear (7) includes a toothed portion (7-1) at the front end and a connecting portion (7-2) at the rear end, wherein the toothed portion (7-1) is meshed with the inner gear ring of the planetary wheel carrier (3) for transmission, the outer periphery of the connecting portion (7-2) is matched with the inner ring of the needle roller bearing (6), and the axial slot (8) is provided on the annular surface at the rear end of the inner hole of the connecting portion (7-2).

3. The starter shaft gear split transmission structure according to claim 2, characterized in that: A shaft retaining ring (10) is embedded on the outer periphery of the rear end of the connecting portion (7-2) protruding outside the rear end surface of the eccentric middle cover (2), a friction-reducing washer (11) is provided in contact with the rear end surface of the eccentric middle cover (2), and a flat washer (12) is provided between the friction-reducing washer (11) and the shaft retaining ring (10).

4. The starter shaft gear split transmission structure according to claim 2, characterized in that: The axial key (9) is a rectangular body. Four rectangular grooves evenly distributed in the circumferential direction are opened on the front end surface of the iron core of the rotor (1). The rear end of the axial key (9) is fixed in the rectangular groove, and the front end of the axial key (9) is plugged into the corresponding axial slot (8).

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