Limiting device for gear ring

Abstract

The invention relates to a limiting device for a gear ring. A limiting device for a gear ring comprises a clamping ring used for limiting axial movement of the gear ring, and the clamping ring is provided with a roughly annular shape and comprises an opening and a notch facing the radial inner side; the pin is used for being connected with the notch of the clamping ring, and the inner radius of the clamping ring at the notch is larger than the inner radius of the clamping ring at other positions.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and more particularly to a limiting device for a ring gear of a planetary gear mechanism. Background Art

[0002] The transmission of a vehicle generally includes a planetary gear mechanism. The planetary gear mechanism includes a sun gear, a planet carrier, a plurality of planetary wheels and a ring gear. The ring gear is generally connected to the housing of the transmission in a torsionally rigid manner through a spline. During the operation of the transmission, the ring gear will be subjected to axial forces. For this reason, the axial movement of the ring gear needs to be limited by other components, such as a snap ring. In the existing axial limit design for the ring gear, the snap ring is installed in a snap ring groove formed on the inner wall of the housing. For ease of installation, the snap ring is generally in a roughly annular shape with an opening. After being installed in the housing, the snap ring will engage with the ring gear to limit the axial movement of the ring gear and keep the axial position of the ring gear fixed relative to the housing. When the snap ring is subjected to axial impact of the ring gear during the operation of the transmission, the snap ring may shrink and pop out or fall off from the snap ring groove of the housing, which may cause the transmission to malfunction or even be damaged.

[0003] Therefore, a limiting device for the gear ring is needed to prevent it from coming out. Summary of the invention

[0004] One object of the present invention is to provide a limiting device for a gear ring that can prevent it from coming out. Another object of the present invention is to provide a limiting device for a gear ring that is easy to assemble. Another object of the present invention is to provide a limiting device for a gear ring that has a simple structure.

[0005] One aspect of the present invention provides a limiting device for a ring gear, comprising: a retaining ring, which is used to limit the axial movement of the ring gear, wherein the retaining ring has a generally annular shape and includes an opening and includes a recess facing radially inward; and a pin, which is used to engage with the recess of the retaining ring, wherein the inner radius of the retaining ring at the recess is larger than the inner radius of the retaining ring at other positions.

[0006] According to some embodiments of the present invention, the snap ring includes a plurality of notches, the plurality of notches are arranged spaced apart in the circumferential direction, and the stopper includes a plurality of pins, the number of the pins being the same as the number of the notches.

[0007] According to some embodiments of the present invention, the arc length of the notch, viewed along the axis, is greater than the diameter of the pin.

[0008] According to some embodiments of the present invention, the plurality of notches are evenly distributed along the circumference.

[0009] According to some embodiments of the present invention, the snap ring comprises two notches and the stop means comprises two pins.

[0010] According to some embodiments of the invention, the pin is a standard pin.

[0011] According to some embodiments of the present invention, the snap ring is integrally formed.

[0012] One aspect of the present invention provides a transmission, comprising: a housing having an internal cavity and including an annular groove facing radially inward; a planetary gear mechanism including a ring gear; and a limiting device according to an embodiment of the present invention, wherein a retaining ring is configured to be installed in the groove of the housing to engage with the ring gear and limit the axial movement of the ring gear, and a pin is connected to the housing to engage with the recess of the retaining ring, and wherein a distance from a center axis of the pin of the limiting device to a center axis of the retaining ring of the limiting device is less than an inner radius of the retaining ring at the recess, and greater than an inner radius of the retaining ring at other positions.

[0013] According to some embodiments of the present invention, the housing includes a mounting hole for the connecting pin.

[0014] One aspect of the present invention provides a vehicle including a transmission according to an embodiment of the present invention.

[0015] According to an embodiment of the present invention, the snap ring is provided with a notch facing radially inward, and after the snap ring is installed in the groove of the housing, the pin can be located in the notch of the snap ring to prevent the snap ring from coming out of the groove of the housing due to shrinkage. In addition, since the pin is installed in the notch of the snap ring, even if the snap ring is slightly loose, the pin can still prevent the snap ring from coming out of the groove of the housing. Thus, the pin can prevent the snap ring from shrinking and coming out of the clamping groove of the housing. Observed in the axial direction, the arc length of the notch of the snap ring is twice or more times the diameter of the pin. Therefore, the snap ring can be installed more conveniently, and the circumferential position of the snap ring does not need to be accurately controlled, as long as the pin installed in the housing can be located within the range of the notch. In addition, since the pin is installed in the notch of the snap ring, even if the snap ring moves to a certain extent in the circumferential direction, the pin will not leave the notch, thereby still preventing the snap ring from coming out of the groove of the housing. In addition, the notch of the snap ring can be directly processed, and the pin can use standard parts, so there is no need to add more special parts, thereby reducing costs. In addition, the limiting device according to the present invention has a simple structure and is easy to implement without requiring major modifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a transmission housing and a limiting device according to an embodiment of the present invention.

[0017] Figure 2 is a schematic diagram of a snap ring according to an embodiment of the present invention.

[0018] Figure 3 1 is a partial cross-sectional schematic diagram of a transmission housing and a limiting device according to an embodiment of the present invention.

[0019] Figure 4 It is a partially enlarged schematic diagram of a transmission housing and a limiting device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention are described with reference to the accompanying drawings. The following detailed description and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, and the present invention is not limited to the preferred embodiments described. The scope of the present invention is defined by the claims. The present invention is now described in detail with reference to exemplary embodiments, and some embodiments are illustrated in the accompanying drawings. The following description is made with reference to the accompanying drawings, and unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The schemes described in the following exemplary embodiments do not represent all schemes of the present invention. On the contrary, these schemes are merely examples of systems and methods of various aspects of the present invention involved in the appended claims.

[0021] The present invention provides a limiting device for a ring gear and a transmission including the limiting device. The limiting device according to an embodiment of the present invention can be used in a transmission, in particular, a transmission of an electric bridge drive system. Below, exemplary embodiments of the present invention are described with reference to the accompanying drawings. It should be understood that only certain embodiments of the present invention are shown in the accompanying drawings, and the scope of the present invention should be determined according to the claims.

[0022] In an exemplary embodiment, a transmission includes a housing, a planetary gear mechanism, and a limit stop. Figure 1 is a schematic diagram of a transmission housing and a limiting device according to certain embodiments of the present invention. Figure 2 is a schematic diagram of a snap ring according to some embodiments of the present invention. Figure 3 is a partial cross-sectional schematic diagram of a transmission housing and a limiting device according to certain embodiments of the present invention. Figure 4 It is a partially enlarged schematic diagram of a transmission housing and a limiting device according to certain embodiments of the present invention.

[0023] In an exemplary embodiment, if Figure 1 As shown, the housing 10 has an internal cavity. Figure 3 As shown, the housing 10 includes an annular groove 11 facing radially inward.

[0024] The planetary gear mechanism is arranged in the inner cavity of the housing 10. The planetary gear mechanism comprises a ring gear 12, a sun gear, a planet carrier and a plurality of planetary gears. Please note that the sun gear, the planet carrier and the planetary gears of the planetary gear mechanism are not shown in the figure to avoid blurring the key points.

[0025] The limiting device is used to limit the axial movement of the ring gear 12. In an exemplary embodiment, the limiting device includes a snap ring 20 and a pin 30. Figure 2As shown, the snap ring 20 has a generally annular shape and includes an opening 21. Figure 3 As shown, the snap ring 20 is installed in the groove 11 of the housing 10. When installed in the groove 11, the snap ring 20 can engage with the ring gear 12 to limit the axial movement of the ring gear 12. In an exemplary embodiment, the snap ring 20 is formed integrally.

[0026] In an exemplary embodiment, the snap ring 20 includes two notches 22 facing radially inward. In some embodiments, the two notches 22 are arranged at intervals greater than 90 degrees along the circumferential direction. In some embodiments, the two notches 22 are arranged at intervals of 180 degrees along the circumferential direction, that is, evenly distributed along the circumferential direction.

[0027] The pin 30 is used to engage with the notch 22 of the snap ring 20. In the exemplary embodiment, the stop device includes two pins 30. Figure 3 As shown, the pins 30 are connected to the housing 10. The housing 10 has a mounting hole for mounting the pins 30. When the snap ring 20 is properly installed in the groove 11 of the housing 10, each pin 30 can be at least partially located in and engaged with a corresponding notch 22 of the snap ring 20. In some embodiments, the pins 30 are standard pins.

[0028] By having the pin 30 connected to the housing 10 and located in the recess 22 of the snap ring 20, the snap ring 20 can be prevented from coming out of the groove 11 of the housing 10 due to shrinkage. In addition, since the pin 30 is installed in the recess 22 of the snap ring 20, even if the snap ring 20 is slightly loose, the pin 30 can still prevent the snap ring 22 from coming out of the groove 11 of the housing 10.

[0029] The inner radius of the snap ring 20 at the notch 22 is greater than the inner radius of the snap ring 20 at other positions (positions other than the notch 20). The distance from the center axis of the pin 30 mounted to the housing 10 to the center axis of the snap ring 20 is less than the inner radius of the snap ring 20 at the notch 22, and greater than the inner radius of the snap ring 20 at other positions.

[0030] In an exemplary embodiment, the arc length of the notch 22 of the snap ring 20 is greater than the diameter of the pin 30 when viewed in the axial direction. In some embodiments, the arc length of the notch 22 of the snap ring 20 is two or more times the diameter of the pin 30 when viewed in the axial direction. In this case, since the arc length of the notch 22 of the snap ring 20 is several times the diameter of the pin 30, the snap ring 20 can be installed more conveniently without the need to accurately control the circumferential position of the snap ring 20, as long as the pin 30 installed in the housing 10 can be located within the range of the notch 22. In addition, since the pin 30 is installed in the notch 22 of the snap ring 20, even if the snap ring 22 moves to a certain extent in the circumferential direction, the pin 30 will not leave the notch 22, thereby still preventing the snap ring 22 from coming out of the groove 11 of the housing 10.

[0031] It is described above that the snap ring 20 includes two notches 21. However, the present invention is not limited thereto. In other embodiments, the snap ring 20 may also include three or more notches, and preferably, the notches are evenly distributed along the circumferential direction.

[0032] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the configuration and method of the above-described embodiments. On the contrary, the present invention is intended to cover various modifications and equivalent configurations. In addition, although the various elements and method steps of the disclosed invention are shown in various exemplary combinations and configurations, other combinations including more or less elements or methods also fall within the scope of the present invention.

[0033] Reference numerals list

[0034] 10 housing;

[0035] 11 grooves;

[0036] 12 ring gear;

[0037] 20 clasp;

[0038] 21 Open your mouth;

[0039] 22 notch;

[0040] 30 pins.

Claims

1. A limiting device for a gear ring, comprising: a snap ring for limiting axial movement of the ring gear, wherein the snap ring has a generally annular shape and includes an opening and includes a notch facing radially inward; and a pin for engaging with the recess of the snap ring, Wherein, the inner radius of the clamping ring at the notch is greater than the inner radius of the clamping ring at other positions.

2. The limiting device according to claim 1, wherein: The snap ring includes a plurality of notches arranged circumferentially spaced apart, and Wherein, the limiting device comprises a plurality of pins, and the number of the pins is the same as the number of the notches.

3. The limiting device according to claim 2, wherein: The arc length of the notch, viewed along the axis, is greater than the diameter of the pin.

4. The limiting device according to claim 3, wherein: The plurality of notches are evenly distributed along the circumferential direction.

5. The limiting device according to claim 4, wherein: The snap ring comprises two notches and the stop means comprises two pins.

6. The limiting device according to claim 5, wherein: The pins are standard pins.

7. The limiting device according to claim 6, wherein: The snap ring is formed in one piece.

8. A transmission, comprising: a housing having an internal cavity and including an annular groove facing radially inward; a planetary gear mechanism comprising a ring gear; and The limiting device according to any one of claims 1 to 7, wherein the snap ring is arranged to be mounted in the groove of the housing to engage with the gear ring and limit the axial movement of the gear ring, and the pin is connected to the housing to engage with the notch of the snap ring, and Wherein, the distance from the central axis of the pin of the limiting device to the central axis of the retaining ring of the limiting device is smaller than the inner radius of the retaining ring at the notch, and larger than the inner radius of the retaining ring at other positions.

9. The transmission according to claim 8, wherein: The housing includes a mounting hole for connecting the pin.

10. A vehicle comprising a transmission according to claim 8 or 9.

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