CN211501549U - Speed changing device for starter - Google Patents
Speed changing device for starter Download PDFInfo
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- CN211501549U CN211501549U CN201920958154.XU CN201920958154U CN211501549U CN 211501549 U CN211501549 U CN 211501549U CN 201920958154 U CN201920958154 U CN 201920958154U CN 211501549 U CN211501549 U CN 211501549U
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Abstract
The application discloses starter speed change gear relates to automobile parts's technical field to solve the poor technical problem of lubricated effect among the prior art. The starter speed change gear comprises a sun gear, an armature shaft, a cover and a planetary gear, wherein the armature shaft is in transmission connection with the sun gear; the cover is provided with a mounting hole and a planet wheel shaft, the cover is arranged on the outer side of the sun wheel through a mounting hole cover, a gear ring is arranged on the inner side wall of the mounting hole, and a fixed shaft is arranged on the inner bottom surface of the mounting hole; the planetary gear is arranged on the fixed shaft and is meshed with the sun gear and the gear ring. The planetary gear comprises a gear body, a central hole, a first groove and a plurality of teeth, wherein the first groove is arranged at the edge junction of the central hole and the gear body. Therefore, the starter speed changing device can transmit the torque and the rotating speed generated by the motor to the one-way clutch under the condition of not being matched with the copper sleeve or the needle bearing, and further drives the engine flywheel to start.
Description
Technical Field
The application relates to the technical field of automobile parts, in particular to a starter speed changing device.
Background
The automobile starter can convert electric energy into mechanical energy by an electromagnetic induction principle, and meets the automatic requirement. The planetary reduction starter is a commonly used automobile starter and comprises a planetary gear type speed change device, and the planetary gear type speed change device can transmit torque and rotating speed generated by a motor to a one-way clutch so as to drive the flywheel of an automobile engine to start. In a planetary gear type transmission, a planetary gear has a poor lubricating effect, and a copper bush is required to be embedded or a needle bearing is required to be installed in the planetary gear to support and reduce friction.
However, since the copper bush or the needle bearing is installed in a complicated procedure, it is necessary to confirm the installation direction not only in the press-in direction and the press-out direction when installing the copper bush or the needle bearing in the starter but also in the process of installing the planetary gear to the starter transmission, which is liable to cause a risk of misinstallation.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a starter speed change gear to solve the poor technical problem of lubricated effect among the prior art.
The above technical problem of the present application is mainly solved by the following technical solutions:
a planetary gear comprises a gear body, a central hole, a first groove and a plurality of teeth, wherein the teeth are arranged on the outer surface of the gear body and are distributed in a circumferential array around the axis of the gear body; the central hole is arranged at the radial center of the gear body and penetrates through the gear body along the thickness direction of the gear body; the first groove is arranged at the boundary of the central hole and the edge of the gear body.
When the planetary gear is installed on the speed changing device of the starter, after the lubricating substance is added, the lubricating substance stays in the first groove, and when the planetary gear rotates, the lubricating substance staying in the first groove flows out, so that the planetary gear can automatically lubricate and reduce friction force. Therefore, the planetary gear is simple in structure and convenient to manufacture by additionally arranging the first groove, the lubricating effect can be improved, the friction is reduced, the strength and the wear resistance are improved, and the planetary gear is suitable for a long-time operation environment.
Wherein the lubricating substance may be a lubricating grease.
In an embodiment, a cross section of the first groove along a thickness direction of the gear body is triangular, rectangular, rounded rectangular, or fan-shaped.
The section of the first groove along the thickness direction of the gear body is triangular, rectangular, rounded rectangular or fan-shaped, and the inner bottom surface of the first groove can be a plane or a curved surface.
In an embodiment, the first grooves are annular grooves, and the radial centers of the first grooves and the radial center of the gear body are overlapped, wherein two first grooves are provided, are respectively located at two ends of the central hole, and are symmetrically arranged.
The first groove is an annular groove, so that the processing is convenient. The two first grooves are symmetrically arranged, so that the assembling direction is not required to be distinguished in the process of assembling the planetary gear to the starter speed changing device, and the situation of installation errors is avoided.
The section of the first groove along the radial direction of the gear body is in a circular ring shape.
In one embodiment, the depth of the first groove along the thickness direction of the gear body is 0.5-1.5 mm, and the depth of the first groove along the radial direction of the gear body is 1.5-3 mm.
The depth of the first groove is determined by the inner diameter of the central hole and the number of teeth, namely the number of teeth.
In an embodiment, a depth of the first groove in a thickness direction of the gear body is smaller than a depth of the first groove in a radial direction of the gear body.
The depth of the first groove in the thickness direction of the gear body is smaller than the depth of the first groove in the radial direction of the gear body, so that the outlet of the lubricating substance is smaller than the inlet of the lubricating substance, more lubricating substance can be stored or retained, and the lubricating substance cannot flow out immediately, so that the residence time of the lubricating substance is prolonged, and the planetary gear can be suitable for the environment of long-time operation.
In an embodiment, the first groove is provided in plural, and the plural first grooves are distributed in a circumferential array around the axis of the gear body.
The first grooves are arranged in a plurality of circumferential arrays around the axis of the gear body, the first grooves are independent small notches and serve as small chambers for independently storing lubricating substances, the lubricating substances cannot flow out immediately, and accordingly residence time of the lubricating substances is prolonged, and the planetary gear can be suitable for long-time operation environments. First recess is equipped with a plurality ofly, and a plurality of independent little notch distribution is in the edge juncture that sets up at centre bore and gear body, then can increase lubricated material's storage capacity, improves lubricated effect.
In one embodiment, in order to prevent the function of the gear from being affected by too many first grooves, the number of the first grooves is 3-4.
In one embodiment, the cross section of the first groove along the radial direction of the gear body is a rounded rectangle, a cut circle or a special shape.
In one embodiment, the gear body and/or the teeth have a plurality of pores therein, and the pores have a lubricating substance therein.
The planet gear can be sintered by adopting an oil-containing powder metallurgy process, namely, metal powder, alloy powder or a mixture of metal powder and nonmetal powder is used as a raw material to be formed and sintered to obtain a sintered product, the sintered product is provided with a plurality of pores, and the sintered product is put into a lubricating substance to be soaked to obtain the planet gear. In the soaking process, the lubricating substance can enter the pores and is stored in the pores, and when the planetary gear rotates, the lubricating substance flows out, so that the planetary gear can automatically lubricate and reduce friction force.
In one embodiment, a plurality of second grooves are uniformly formed on the inner surface of the central hole.
The second groove can increase the space for storing lubricating substances and improve the lubricating effect. The second groove can be an annular groove or a plurality of independent small notches.
A starter speed changing device comprises a sun gear, an armature shaft, a cover and the planetary gear, wherein the armature shaft is in transmission connection with the sun gear; the cover is provided with a mounting hole and a planet wheel shaft, the cover is arranged on the outer side of the sun wheel through the mounting hole, a gear ring is arranged on the inner side wall of the mounting hole, and a fixed shaft is arranged on the inner bottom surface of the mounting hole; the planetary gear is arranged on the fixed shaft and is meshed with the sun gear and the gear ring.
In one embodiment, the planetary wheel shaft, the sun gear, the mounting hole and the gear ring are coaxially arranged.
The planetary gear is the above-mentioned planetary gear. The planetary gear is provided with the planetary gear, so that the starter speed changing device with the planetary gear also has the same technical effect, the lubricating effect between the planetary gear and the fixed shaft is improved, the contact friction area between the planetary gear and the fixed shaft is reduced, and the friction force between the planetary gear and the fixed shaft is reduced, so that the power friction loss and the noise are effectively reduced, the durability of the starter speed changing device is improved, the service life of the starter speed changing device is prolonged, and the starter speed changing device is simple in structure, simple and convenient to mount and low in cost.
In the starter speed changing device, the planet wheel shaft is used for being in transmission connection with the one-way clutch, and the planet gear is directly arranged on the fixed shaft.
The beneficial effects of the embodiment of the application are that: therefore, the planetary gear is simple in structure and convenient to manufacture by additionally arranging the first groove, the lubricating effect can be improved, the friction is reduced, the strength and the wear resistance are improved, and the planetary gear is suitable for a long-time operation environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a starter transmission according to an embodiment of the present application;
FIG. 2a is a front view of a planetary gear shown in an embodiment of the present application;
FIG. 2b is a cross-sectional view of a planetary gear shown in an embodiment of the present application;
FIG. 2c is a cross-sectional view of a planetary gear shown in an embodiment of the present application;
FIG. 3a is a cross-sectional view of a planetary gear shown in an embodiment of the present application;
FIG. 3b is a cross-sectional view of a planetary gear shown in an embodiment of the present application;
FIG. 4 is a front view of a planetary gear shown in an embodiment of the present application;
fig. 5 is a cross-sectional view of a planetary gear according to an embodiment of the present application.
Icon: 100-a planetary gear; 11-a gear body; 12-teeth; 13-a central hole; 14-a first groove; 15-pore space; 131-a second groove; 2-a sun gear; 3-an armature shaft; 4-a machine cover; 41-mounting holes; 42-planet wheel shaft; 411-gear ring; 412-a stationary shaft; 500-starter transmission.
Detailed Description
The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.
In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a starter transmission 500 according to an embodiment of the present application. The starter transmission 500 includes: sun gear 2, armature shaft 3, cover 4 and planetary gear 100. The armature shaft 3 is in transmission connection with the sun gear 2; the cover 4 is provided with a mounting hole 41 and a planet wheel shaft 42, the cover 4 is covered outside the sun gear 2 through the mounting hole 41, the inner side wall of the mounting hole 41 is provided with a gear ring 411, and the inner bottom surface of the mounting hole 41 is provided with a fixed shaft 412; the planetary gear 100 is provided on a fixed shaft 412, and is meshed with the sun gear 2 and the ring gear 411. In one embodiment, the planetary gear shaft 42, the sun gear 2, the mounting hole 41 and the ring gear 411 are coaxially arranged.
In the starter speed changing device 500, the planetary gear shaft 42 is used for being in transmission connection with the one-way clutch, the planetary gear 100 is directly arranged on the fixed shaft 412, and the starter speed changing device 500 can transmit the torque and the rotating speed generated by the motor to the one-way clutch under the condition that the starter speed changing device is not matched with a copper sleeve or a needle bearing, so as to drive the starting of the engine flywheel.
Please refer to fig. 2a, which is a front view of the planetary gear 100 according to an embodiment of the present application. The planetary gear 100 includes: a gear body 11, a central bore 13, a first recess 14 and a plurality of teeth 12. The plurality of teeth 12 are arranged on the outer surface of the gear body 11, and the plurality of teeth 12 are distributed in a circumferential array around the axis of the gear body 11; the center hole 13 is provided in the radial center of the gear body 11 and penetrates the gear body 11 in the thickness direction of the gear body 11; a first recess 14 is provided at the interface of the central bore 13 and the edge of the gear body 11.
In an embodiment, the first groove 14 is an annular groove, and a radial center of the first groove 14 is coincident with a radial center of the gear body 11.
In one embodiment, the first groove 14 has a circular ring shape in cross section along the radial direction of the gear body 11.
Please refer to fig. 2b, which is a cross-sectional view of the planetary gear 100 according to an embodiment of the present application. In an embodiment, a cross section of the first groove 14 along the thickness direction of the gear body 11 is triangular, and an inner bottom surface of the first groove 14 may be a plane. Wherein the first recess 14 may be in the form of a chamfer.
In one embodiment, two first grooves 14 are provided, and are respectively located at two ends of the central hole 13 and are symmetrically arranged.
In one embodiment, the distance from the root circle of the planetary gear 100 to the inner wall of the central hole 13 is defined as E, which can also be defined as the radius of the gear body 11 minus the radius of the central hole 13. The value of E in the planetary gear 100 is increased, so that the strength of the planetary gear 100 can be enhanced, the processing is convenient, and the application range of the planetary gear 100 is enlarged.
The value of E in this application is equal to the width of the prior art copper sleeve or needle bearing plus the value of E in the prior art.
In one embodiment, the depth of the first groove 14 along the thickness direction of the gear body 11 is smaller than the depth of the first groove 14 along the radial direction of the gear body 11.
The thickness direction of the gear body 11 is referred to as an X direction, the radial direction of the gear body 11 is referred to as a Y direction, and since the first groove 14 is an annular groove, and the radial center of the first groove 14 is provided to coincide with the radial center of the gear body 11, the depth of the first groove 14 in the radial direction of the gear body 11 is equal everywhere.
In one embodiment, the depth of the first groove 14 along the thickness direction (X direction) of the gear body 11 is 0.5-1.5 mm, and the depth of the first groove 14 along the radial direction (Y direction) of the gear body 11 is 1.5-3 mm. The depth of the first recess 14 is determined by the inner diameter of the central hole 13 and the number of the teeth 12.
The following table is illustrative of the dimensions of the first recess 14 in the case of different internal diameters (diameters) of the central bore 13 and the number of teeth 12:
please refer to fig. 2c, which is a cross-sectional view of the planetary gear 100 according to an embodiment of the present application. In one embodiment, the gear body 11 and/or the teeth 12 have a plurality of apertures 15 therein, and the apertures 15 have a lubricating substance therein.
The planetary gear 100 may be sintered by an oil-containing powder metallurgy process, i.e., a sintered product obtained by forming and sintering a raw material of metal powder, alloy powder or a mixture of metal powder and non-metal powder, the sintered product having a plurality of pores 15, and then the sintered product is immersed in a lubricating substance to obtain the planetary gear 100. During the soaking process, the lubricating substance can enter the pores 15 and be stored in the pores 15, and when the present planetary gear 100 rotates, the lubricating substance flows out for lubrication, reducing the friction force.
Referring to fig. 3a, a cross-sectional view of a planetary gear 100 according to an embodiment of the present application is shown. In an embodiment, a cross section of the first groove 14 along the thickness direction of the gear body 11 is rectangular.
In an embodiment, a cross section of the first groove 14 along the thickness direction of the gear body 11 may be a rounded rectangle.
Please refer to fig. 3b, which is a cross-sectional view of the planetary gear 100 according to an embodiment of the present application. In one embodiment, the inner bottom surface of the first groove 14 may be a curved surface.
In one embodiment, the cross section of the first groove 14 along the thickness direction of the gear body 11 is a sector.
Referring to fig. 4, a front view of a planetary gear 100 according to an embodiment of the present application is shown. In one embodiment, the first grooves 14 are provided in plural, and the plural first grooves 14 are distributed in a circumferential array around the axis of the gear body 11. That is, the first grooves 14 are independent small grooves, and can be used as small chambers for independently storing the lubricating substance one by one, and the lubricating substance does not flow out immediately, so that the residence time of the lubricating substance is prolonged, and the planetary gear 100 can be applied to a long-time working environment. The first grooves 14 are provided with a plurality of independent small notches which are distributed at the boundary of the edge of the central hole 13 and the gear body 11, so that the storage capacity of lubricating substances can be increased, and the lubricating effect is improved.
In one embodiment, in order to prevent the first grooves 14 from being too many to affect the function of the gear, the first grooves are through grooves, and there are 3 to 4 first grooves.
In an embodiment, the cross section of the first groove 14 along the radial direction of the gear body 11 is a rounded rectangle, a truncated circle or a special shape.
Referring to fig. 5, a cross-sectional view of a planetary gear 100 according to an embodiment of the present application is shown. In one embodiment, a plurality of second grooves 131 are uniformly formed on the inner surface of the central hole 13.
The second groove 131 can increase the space for storing the lubricant, thereby improving the lubrication effect. The second groove 131 may be an annular groove or a plurality of independent small notches.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A starter transmission, comprising:
a sun gear;
the armature shaft is in transmission connection with the sun gear;
the cover is provided with a mounting hole and a planet wheel shaft, the cover is arranged on the outer side of the sun wheel through the mounting hole, a gear ring is arranged on the inner side wall of the mounting hole, and a fixing shaft is arranged on the inner bottom surface of the mounting hole;
the planetary gear is arranged on the fixed shaft and is meshed with the sun gear and the gear ring; wherein the planetary gear includes:
a gear body;
the teeth are arranged on the outer surface of the gear body and distributed in a circumferential array around the axis of the gear body;
the central hole is arranged at the radial center of the gear body and penetrates through the gear body along the thickness direction of the gear body; and
the first groove is arranged at the boundary of the central hole and the edge of the gear body.
2. The starter transmission according to claim 1, wherein a cross section of the first groove in a thickness direction of the gear body is triangular, rectangular, rounded rectangular, or fan-shaped.
3. The starter transmission as recited in claim 2, wherein the first recess is an annular recess and a radial center of the first recess is coincident with a radial center of the gear body.
4. The starter transmission as recited in claim 3, wherein there are two of the first recesses located at opposite ends of the central aperture and arranged symmetrically.
5. The starter transmission according to claim 4, wherein the depth of the first groove in the thickness direction of the gear body is 0.5-1.5 mm.
6. The starter transmission as recited in claim 5, wherein the first recess has a depth of 1.5-3 mm in a radial direction of the gear body.
7. The starter transmission according to claim 6, wherein a depth of the first groove in the thickness direction of the gear body is smaller than a depth of the first groove in the radial direction of the gear body.
8. The starter transmission of claim 2 wherein the first recess is provided in plurality and the plurality of first recesses are distributed in a circumferential array about the axis of the gear body.
9. The starter transmission as claimed in any one of claims 1 to 8 wherein the gear body and/or the teeth have a plurality of apertures therein, the apertures having a lubricating substance therein.
10. The starter transmission of claim 9 wherein a plurality of second grooves are uniformly provided on an inner surface of the central bore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958154.XU CN211501549U (en) | 2019-06-24 | 2019-06-24 | Speed changing device for starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920958154.XU CN211501549U (en) | 2019-06-24 | 2019-06-24 | Speed changing device for starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211501549U true CN211501549U (en) | 2020-09-15 |
Family
ID=72393984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920958154.XU Active CN211501549U (en) | 2019-06-24 | 2019-06-24 | Speed changing device for starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211501549U (en) |
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2019
- 2019-06-24 CN CN201920958154.XU patent/CN211501549U/en active Active
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