Nut locking structure of new energy transmission

Abstract

The utility model relates to a nut anti-loosening structure of a new energy transmission, and aims to solve the problem that a spindle nut anti-loosening structure of the new energy transmission in the energy recovery stage is easy to damage or lose efficacy in the prior art. The nut anti-loosening structure comprises a bearing, a nut, a transmission input shaft, a thrust washer and a fastening bolt. The transmission input shaft is provided with multiple sections of stepped shafts, and a first stepped shaft, a second stepped shaft and a third stepped shaft are sequentially arranged in the direction from the bevel gear to the outer spline. The first stepped shaft is sleeved with a bearing, the nut at the position of the second stepped shaft is connected with the input shaft of the transmission through threads, after an inner tongue groove and an inner tongue of a thrust washer are aligned on the third stepped shaft, the thrust washer is placed in, a fastening bolt sequentially penetrates through a threaded through hole of the thrust washer and a threaded through hole of the nut, and the fastening bolt is tightened. And assembling of the nut anti-loosening structure can be completed.

Description

Technical Field

[0001] The utility model relates to a loosening prevention structure for a connecting piece, in particular to a loosening prevention structure for a nut of a new energy transmission. Background Art

[0002] Due to the perfect design system of traditional fuel vehicle transmissions, most key components of new energy transmissions still adopt the original structures. Among them, the structures for preventing the main shaft nut from loosening and retreating usually follow the riveting and punching type and the lock washer type. The former is to punch the outer convex thin wall of the shaft head nut into the shaft head groove, and the latter is to snap the inner tongue of the lock washer into the shaft head groove and the outer tongue into the shaft head nut. Such structures have high reliability during normal vehicle driving, but their reliability is poor during deceleration or downhill of new energy vehicles to achieve energy recovery. This is because the axial forces on the internal helical gears of the transmission are in opposite directions during normal driving and energy recovery stages, which will form strong vibration shocks, easily cause the failure of the riveting and punching structure or the fracture of the inner and outer tongues of the lock washer, resulting in faults such as nut loosening, failure of the drive shaft positioning, and severe wear of key components of the transmission, posing great potential safety hazards.

[0003] Chinese Patent CN203892518U provides a thrust component, which pins the bearing and the bearing housing along the radially arranged thrust block to limit their relative movement in the axial direction, reduce the axial displacement of the transmission input shaft, and play a thrusting role. However, regarding the problem that the loosening prevention structure of the transmission helical gear is damaged or fails due to the influence of axial force, this utility model does not solve it.

[0004] Chinese Patent CN220956703U discloses a one-way rotation loosening prevention structure at the output shaft of a transmission, including a flange, a fastener assembly sleeved on the transmission output shaft, and a loosening prevention spacer. Wedge-shaped surfaces are formed between the first loosening prevention nut and the second loosening prevention nut that make up the fastener assembly, and between the loosening prevention spacer and the flange, which can generate resistance, thus achieving the purpose of loosening prevention. However, it is not applicable to solve the problem that the loosening prevention structure of the transmission is easily damaged or fails during the energy recovery stage due to the influence of axial force. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the loosening prevention structure of the main shaft nut of a new energy transmission is easily damaged or fails during the energy recovery stage in the prior art, and provide a loosening prevention structure for a nut of a new energy transmission.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A loosening prevention structure for a nut of a new energy transmission, including a transmission input shaft, as well as a bearing and a nut installed on the transmission input shaft; a helical gear and an external spline are arranged on the transmission input shaft; the special feature is that:

[0008] There are three stepped shafts arranged in sequence from the helical gear towards the external spline direction on the transmission input shaft, namely the first stepped shaft, the second stepped shaft, and the third stepped shaft. The diameters of the first stepped shaft, the second stepped shaft, and the third stepped shaft decrease in sequence, and the diameter of the third stepped shaft is greater than the diameter of the transmission input shaft outside it.

[0009] The bearing is sleeved on the first stepped shaft, and the nut is sleeved on the second stepped shaft; a thrust washer is sleeved on the third stepped shaft; among them, the side walls of the bearing, the nut, and the thrust washer are abutted against each other in sequence.

[0010] The outer side wall of the second stepped shaft is machined with external threads, and the nut is connected to the second stepped shaft through internal threads; M threaded through holes are arranged circumferentially on the nut, where M≥2.

[0011] The outer side wall of the third stepped shaft is machined with N internal tongue grooves distributed circumferentially and extending axially, where N≥1; N internal tongues with structural dimensions adapted to the internal tongue grooves are evenly distributed on the inner side of the thrust washer, and the internal tongues are embedded in the internal tongue grooves; I through holes are evenly arranged circumferentially on the thrust washer, and the radial position of each through hole on the thrust washer corresponds to the radial position of the threaded through hole on the nut, and I = n×M, where n is an integer greater than or equal to 1.

[0012] It further includes K fastening bolts. The K fastening bolts respectively pass through the through holes on the thrust washer and are connected to the threaded through holes on the nut to connect the thrust washer and the nut together, where K≥1.

[0013] Furthermore, the shaft shoulder of the third stepped shaft is a transition fillet, which is used to avoid fracture at the connection between the stepped shaft and the journal of the transmission input shaft due to stress concentration, and at the same time, it is also convenient to sleeve the thrust washer on the third stepped shaft during assembly.

[0014] Furthermore, the nut is a hexagonal nut, and chamfers are machined at each corner, which is convenient for operators to assemble; 6 threaded through holes are evenly arranged circumferentially on the nut, which can minimize the processing cost of components while ensuring stable connection.

[0015] Furthermore, 12 through holes are evenly machined circumferentially on the thrust washer. The purpose is to increase fault tolerance and facilitate aligning the threaded through holes on the nut with the through holes on the thrust washer by adjusting the nut during the assembly process, so as to carry out the assembly.

[0016] Further, two inner tongue grooves are machined on the outer wall of the third stepped shaft, which are circumferentially distributed and axially extended. The axial mid-plane of the two inner tongue grooves lies in the same plane passing through the central axis of the third stepped shaft. Two inner tongues with structural dimensions adapted to those of the inner tongue grooves are machined on the inner side of the thrust washer. The two inner tongues are located in the inner tongue grooves to ensure the correct positioning of the thrust washer during assembly. While ensuring its axial stability, the processing cost is minimized to the greatest extent and the working reliability is improved.

[0017] Further, three fastening bolts are installed on the thrust washer and the nut, and three through holes are spaced on the thrust washer between two adjacent fastening bolts.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. In a nut loosening prevention structure of a new energy transmission provided by the present utility model, the inner tongue of the thrust washer is connected to the inner tongue groove of the transmission main shaft, and the thrust washer and the nut are connected by fastening bolts, forming a double mechanical loosening prevention structure, which improves the anti-vibration and impact resistance and can effectively solve the problem that the nut loosening prevention structure of the main shaft of the new energy transmission is easily damaged or fails during the energy recovery stage.

[0020] 2. In a nut loosening prevention structure of a new energy transmission provided by the present utility model, since the nut is installed first and then the thrust washer during assembly, only the thread needs to be machined at the nut joint, and there is no need to machine the thread at the thrust washer joint. The two are in mutual contact and the position is limited by the shaft shoulder, solving the problem of machining inner tongue grooves on the thread in the loosening prevention structures such as lock washers, and ensuring the integrity of the thread and the strength of the thread connection.

[0021] 3. The nut loosening prevention structure of a new energy transmission provided by the present utility model can freely adjust the number and structural dimensions of the inner tongue grooves, inner tongues, threaded through holes and fastening bolts according to factors such as processing technology and load size during actual application, fully meeting the production and manufacturing requirements and usage needs of various transmissions. Description of the Drawings

[0022] Figure 1 It is an assembly drawing of an embodiment of the nut loosening prevention structure of the new energy transmission of the present utility model.

[0023] Figure 2 It is a schematic structural diagram of the transmission input shaft in an embodiment of the nut loosening prevention structure of the new energy transmission of the present utility model;

[0024] Figure 3 It is a schematic structural diagram of the nut in an embodiment of the nut loosening prevention structure of the new energy transmission of the present utility model;

[0025] Figure 4 It is a schematic structural diagram of the thrust washer in an embodiment of the nut loosening prevention structure of the new energy transmission of the present utility model;

[0026] Description of the reference numerals:

[0027] 1 - First stepped shaft, 2 - Second stepped shaft, 3 - Third stepped shaft, 4 - Inner tongue groove, 5 - Threaded through-hole, 6 - Internal thread of nut, 7 - Through-hole, 8 - Inner tongue, 9 - Bearing, 10 - Nut, 11 - Thrust washer, 12 - Transmission input shaft, 13 - Fastening bolt. Detailed implementation manners

[0028] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0029] A nut anti-loosening structure for a new energy transmission provided by the present utility model, as Figure 1 shown, includes a transmission input shaft 12 and a bearing 9, a nut 10 and a thrust washer 11 mounted on the transmission input shaft 12; as Figure 2 shown, the transmission input shaft 12 is machined with a helical gear and an external spline, and a first stepped shaft 1, a second stepped shaft 2 and a third stepped shaft 3 are sequentially arranged from the helical gear towards the external spline, the diameters of the three are sequentially reduced, and the diameter of the third stepped shaft 3 is larger than the shaft diameter of the transmission input shaft 12 outside it; the shaft shoulder of the third stepped shaft 3 is a transition fillet, which facilitates the installation of subsequent components while ensuring the strength of the input shaft;

[0030] The bearing 9 is sleeved on the first stepped shaft 1; an external thread is machined on the outside of the second stepped shaft 2, and the nut 10 is screwed onto the second stepped shaft 2 through an internal thread 6 machined on its inner side; as Figure 3 shown, the nut 10 is a hexagonal nut, and six threaded through-holes 5 are uniformly arranged on it along the circumferential direction, so that it can take into account the connection stability and processing cost problems, and is convenient for operators to assemble;

[0031] Two inner tongue grooves 4 distributed along the circumferential direction and extending along the axial direction are machined on the outer side wall of the third stepped shaft 3, and the axial mid-plane of the two inner tongue grooves is located in the same plane passing through the central axis of the third stepped shaft 3; two inner tongues 8 matching the structural dimensions of the inner tongue grooves 4 are distributed on the inner side of the thrust washer 11. During assembly, the inner tongues 8 are embedded into the inner tongue grooves 4, so that the thrust washer 11 is sleeved on the third stepped shaft 3; as Figure 4 , twelve through-holes 7 are also machined on the thrust washer 11 along the circumferential direction. The purpose is to increase fault tolerance. During the assembly process, the nut 10 can be adjusted to align the threaded through-holes 5 on the nut 10 with the through-holes 7 on the thrust washer 11 and then perform subsequent installation; three fastening bolts 13 are sequentially passed through the through-holes 7 on the thrust washer 11 and the threaded through-holes 5 on the nut 10 and tightened to connect the thrust washer 11 and the nut 10 together; among them, three through-holes are separated between adjacent two fastening bolts 13 on the thrust washer.

[0032] In the above structure, the inner tongue 8 on the thrust washer 11 is inserted into the inner tongue groove 4 on the third stepped shaft 3, and the thrust washer 11 and the nut 10 are connected by the fastening bolt 13, forming a double mechanical locking structure, which can effectively improve the anti-vibration and impact resistance. During the assembly process, since the nut 10 is installed first and then the thrust washer 11, only the thread needs to be machined at the joint between the nut 10 and the second stepped shaft 2, without machining the thread at the joint between the thrust washer 11 and the third stepped shaft 3. The two are in mutual contact and the position is limited by the shaft shoulder, solving the problem of machining the inner tongue groove on the thread in the locking structures such as the lock washer, and ensuring the integrity of the thread and the strength of the threaded connection. In fact, the operator can freely adjust the number and structural dimensions of the inner tongue groove, inner tongue, threaded through hole and fastening bolt according to factors such as the processing technology and the load size, so as to fully meet the production and manufacturing requirements of various transmissions and the needs of different usage scenarios.

[0033] In the description of the present invention, it should be understood that the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. For those of ordinary skill in the art, the specific technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be equivalently replaced, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A new energy transmission nut anti-loosening structure, comprising a transmission input shaft (12), and a bearing (9) and a nut (10) mounted on the transmission input shaft (12); the transmission input shaft (12) is provided with a helical gear and an external spline, characterized in that: The transmission input shaft (12) is provided with three stepped shafts in sequence from the helical gear to the outward spline direction, namely a first stepped shaft (1), a second stepped shaft (2) and a third stepped shaft (3), wherein the diameters of the first stepped shaft (1), the second stepped shaft (2) and the third stepped shaft (3) decrease in sequence, and the diameter of the third stepped shaft (3) is greater than the diameter of the transmission input shaft (12) outside the third stepped shaft; The bearing (9) is sleeved on the first stepped shaft (1), and the nut (10) is sleeved on the second stepped shaft (2); a thrust washer (11) is sleeved on the third stepped shaft (3); the side walls of the bearing (9), the nut (10) and the thrust washer (11) are abutted in sequence; The outer wall of the second stepped shaft (2) is processed with an external thread, and the nut (10) is connected to the second stepped shaft (2) via an internal thread (6); M threaded through holes (5) are arranged on the nut (10) along the circumferential direction, where M≥2; The outer wall of the third stepped shaft (3) is processed with N inner tongue grooves (4) distributed in the circumferential direction and extending in the axial direction, wherein N ≥ 1; N inner tongues (8) matching the structural dimensions of the inner tongue grooves (4) are evenly distributed on the inner side of the thrust washer (11), and the inner tongues (8) are embedded in the inner tongue grooves (4); I through holes (7) are evenly arranged in the circumferential direction on the thrust washer (11), and the radial position of each through hole (7) on the thrust washer (11) corresponds to the radial position of the threaded through hole (5) on the nut (10), and I = n × M, where n is an integer greater than or equal to 1; It also includes K fastening bolts (13), which respectively pass through the through holes (7) on the thrust washer (11) and are connected to the threaded through holes (5) on the nut (10), thereby connecting the thrust washer (11) and the nut (10) together, wherein K≥1.

2. A new energy transmission nut anti-loosening structure according to claim 1, characterized in that: The shaft shoulder of the third stepped shaft (3) is a transition fillet.

3. The new energy transmission nut anti-loosening structure according to claim 1 is characterized in that: The nut (10) is a hexagonal nut, and each corner is chamfered.

4. A new energy transmission nut anti-loosening structure according to claim 3, characterized in that: Six threaded through holes (5) are evenly arranged on the nut (10) along the circumferential direction.

5. A new energy transmission nut anti-loosening structure according to claim 4, characterized in that: The thrust washer (11) is evenly machined with 12 through holes (7) along the circumferential direction.

6. The new energy transmission nut anti-loosening structure according to claim 1 is characterized in that: The outer wall of the third stepped shaft (3) is processed with two inner tongue grooves (4) distributed in the circumferential direction and extending in the axial direction, and the axial center planes of the two inner tongue grooves (4) are located on the same plane passing through the central axis of the third stepped shaft (3).

7. The new energy transmission nut anti-loosening structure according to claim 5 is characterized in that: Two inner tongues (8) matching the structural dimensions of the inner tongue groove (4) are processed on the inner side of the thrust washer (11), and the two inner tongues (8) are located in the inner tongue groove (4).

8. The new energy transmission nut anti-loosening structure according to claim 5 is characterized in that: K=3, and among the three fastening bolts (13), three through holes (7) are spaced apart on the thrust washer (11) between two adjacent fastening bolts (13).

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