Low-noise transmission device

Abstract

The utility model relates to a low-noise transmission device which comprises a driving assembly and a transmission assembly which are connected with each other. The transmission assembly comprises a high-speed-level helical tooth planetary transmission assembly, a middle-level straight tooth planetary transmission assembly, a low-speed-level straight tooth planetary transmission assembly and a straight tooth inner gear ring. A helical tooth inner gear ring of the high-speed-stage helical tooth planetary transmission assembly is connected with a straight tooth inner gear ring, and the middle-stage straight tooth planetary transmission assembly and the low-speed-stage straight tooth planetary transmission assembly are in transmission connection with the straight tooth inner gear ring. The high-speed-stage helical tooth planetary transmission assembly, the middle-stage straight tooth planetary transmission assembly and the low-speed-stage straight tooth planetary transmission assembly are in transmission connection in sequence. Compared with the prior art, the transmission mechanism has the advantages that the noise of the transmission mechanism is reduced, the transmission stability is improved, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to a low-noise transmission device. Background Art

[0002] As a precise transmission method, micro planetary gear transmission mechanism is widely used in various engineering fields, especially in automotive applications in recent years, where there are high requirements for output speed and output torque, and there are certain requirements for noise and vibration control. Existing planetary gear transmission mechanisms are often multi-stage planetary transmissions with straight teeth, so under high input speed conditions, the noise and vibration of the whole machine will be relatively large.

[0003] For planetary gear transmission, the high speed of the high-speed stage is the main source of noise. How to structurally design the high-speed spur gear planetary transmission to reduce the noise of the transmission mechanism and improve the transmission smoothness has become a technical problem that needs to be solved. Utility Model Content

[0004] The purpose of the utility model is to provide a low-noise transmission device in order to overcome the defects of the above-mentioned prior art, which effectively reduces transmission noise and vibration while ensuring a compact structure, improves the compactness and precision of the transmission mechanism; at the same time, ensures the detachability of the mechanism, which is convenient for parts replacement.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] According to one aspect of the utility model, a low-noise transmission device is provided, comprising a drive assembly and a transmission assembly connected to each other; the transmission assembly comprises a high-speed helical planetary transmission assembly, an intermediate-stage spur planetary transmission assembly, a low-speed spur planetary transmission assembly and a spur internal gear ring, the helical internal gear ring of the high-speed helical planetary transmission assembly is connected to the spur internal gear ring, the intermediate-stage spur planetary transmission assembly and the low-speed spur planetary transmission assembly are respectively transmission-connected to the spur internal gear ring, and the high-speed helical planetary transmission assembly, the intermediate-stage spur planetary transmission assembly and the low-speed spur planetary transmission assembly are transmission-connected in sequence.

[0007] As a preferred technical solution, the driving assembly includes a driving motor, a buckle, an end cover and a driving sun gear;

[0008] The driving motor is fixed to the spur gear inner ring through buckles and end covers, and drives the driving sun gear to output power through the transmission assembly.

[0009] As a preferred technical solution, the high-speed helical gear planetary transmission assembly includes a high-speed helical gear inner ring, a high-speed helical gear planetary wheel and a high-speed planet carrier;

[0010] The intermediate-stage spur-tooth planetary transmission assembly comprises an intermediate-stage spur-tooth planetary gear, an intermediate-stage rotating shaft and an intermediate-stage planetary carrier;

[0011] The low-speed spur gear planetary transmission assembly comprises a low-speed spur gear planetary wheel, a low-speed rotating shaft, a low-speed planetary carrier and an output shaft;

[0012] The driving motor drives the driving sun gear to rotate coaxially, and the driving sun gear is respectively meshed with the high-speed helical gear ring and the high-speed helical gear planetary gear for transmission, and the high-speed helical gear ring cooperates with the spur gear ring for circumferential limit, and the high-speed helical gear planetary gear is sleeved on the high-speed planetary carrier;

[0013] The high-speed planet carrier is meshed with the intermediate spur planetary gear and the spur inner gear ring for transmission respectively, the intermediate rotating shaft is fixed on the intermediate planet carrier, and the intermediate spur planetary gear is sleeved on the intermediate rotating shaft to drive the intermediate planet carrier to rotate;

[0014] The intermediate stage planet carrier is meshed with the low-speed stage spur gear planetary gear for transmission, the low-speed stage rotating shaft is fixed on the low-speed stage planet carrier, the low-speed stage spur gear planetary gear is sleeved on the low-speed stage rotating shaft to drive the low-speed stage planet carrier to rotate, and the output shaft is fixed on the low-speed stage planet carrier.

[0015] As a preferred technical solution, the high-speed helical internal gear ring and the spur internal gear ring are integrally formed by injection molding;

[0016] Part of the teeth of the inner teeth of the spur gear internal gear ring are removed to form a positioning end face for axial positioning with the end face of the high-speed helical gear internal gear ring;

[0017] The outer shell of the high-speed helical gear internal gear ring is provided with a plurality of positioning ribs and a first through hole for circumferential positioning in cooperation with the tooth grooves of the spur gear internal gear ring.

[0018] As a preferred technical solution, the spur gear internal gear ring is provided with a groove a, a groove b and a boss on the housing side close to the drive motor, which are used to be fixedly connected to the buckle and the end cover respectively.

[0019] As a preferred technical solution, the high-speed planet carrier is an integrally-injected component, including a rotating shaft and an intermediate sun gear;

[0020] The intermediate stage planet carrier is a component integrally formed by powder metallurgy injection molding, and comprises a second through hole for mounting the rotating shaft and a low-speed stage sun gear.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] 1) The planetary gear transmission mechanism of the utility model adopts high-speed helical gear planetary transmission, which will effectively increase the overlap of high-speed planetary transmission, reduce the noise of the transmission mechanism and improve the transmission stability. The high-speed helical gear inner ring housing is positioned by ribs and spur gear inner ring, which is convenient for installation and ensures the compactness and precision of the overall transmission mechanism.

[0023] 2) The drive assembly and transmission assembly adopted in the utility model are positioned by the end cover and fixedly connected by buckles, and are detachable, so that parts can be easily replaced and inspected. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the transmission mechanism in the utility model.

[0025] Figure 2 It is a structural schematic diagram of the driving assembly of the transmission mechanism in the utility model.

[0026] Figure 3 It is a structural schematic diagram of the transmission assembly of the transmission mechanism in the utility model.

[0027] Figure 4 It is a schematic diagram of the buckle structure of the drive assembly in the utility model.

[0028] Figure 5 It is a schematic diagram of the end cover structure of the drive assembly in the utility model.

[0029] Figure 6 It is a structural schematic diagram of the spur gear internal gear ring in the utility model.

[0030] Figure 7 It is a structural schematic diagram of the high-speed helical internal gear ring of the utility model.

[0031] Figure 8 It is a structural schematic diagram of the high-speed planetary carrier of the utility model.

[0032] Fig. 9 It is a structural schematic diagram of the intermediate stage planet carrier in the utility model.

[0033] Among them, 10 is a driving component, and 20 is a transmission component;

[0034] 11 is a driving motor, 12 is a buckle, 13 is an end cover, and 14 is a driving sun gear;

[0035] 21 is a high-speed helical planetary transmission assembly, 22 is an intermediate planetary transmission assembly, 23 is a low-speed planetary transmission assembly, 24 is a spur gear internal gear ring, 25 is an oil-containing bearing, 26 is a baffle, and 27 is a clamping ring;

[0036] 111 is a groove, 112 is a motor shaft; 121 is a matching hole, 122 is a fixing buckle; 131 is a matching boss a, 132 is a matching boss b;

[0037] 211 is a high-speed helical gear inner ring, 212 is a high-speed helical gear planetary gear, 213 is a high-speed planetary carrier, 221 is an intermediate spur gear planetary gear, 222 is an intermediate shaft, 223 is an intermediate planetary carrier, 231 is a gasket, 232 is a low-speed spur gear planetary gear, 233 is a low-speed shaft, 234 is a low-speed planetary carrier, and 235 is an output shaft;

[0038] 241 is groove a, 242 is groove b, 243 is boss, and 244 is positioning end surface;

[0039] 2111 is a positioning rib, 2112 is a first through hole, 2131 is a rotating shaft, 2132 is an intermediate stage sun gear, 2231 is a second through hole, and 2232 is a low speed stage sun gear. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0041] The utility model designs the high-speed spur gear planetary transmission into a helical gear transmission, which will effectively increase the overlap of the high-speed planetary transmission, reduce the noise of the transmission mechanism and improve the transmission stability. At the same time, since the input stage transmission torque is small, the input stage gear module can be reduced to ensure the compactness of the overall transmission mechanism.

[0042] The utility model provides a low-noise transmission mechanism, including a drive assembly 10 and a transmission assembly 20. The drive assembly 10 includes a drive motor 11, a buckle 12, an end cover 13 and a drive sun gear 14; the transmission assembly 20 includes a high-speed helical planetary transmission assembly 21, an intermediate spur planetary transmission assembly 22, a low-speed spur planetary transmission assembly 23, a spur internal gear ring 24, an oil-containing bearing 25, a baffle 26 and a clamping ring 27.

[0043] Specifically, please refer to Figure 1 to Figure 2 The driving assembly 10 is a motor assembly, which is fixed to the spur gear ring 24 of the transmission assembly 20 through the buckle 12 and the end cover 13. The driving motor 11 inputs power to drive the driving sun gear 14 to output power through the transmission assembly 20.

[0044] Specifically, please refer to Figure 3The transmission mechanism 20 is a planetary gearbox, including a high-speed helical planetary transmission assembly 21, an intermediate-stage spur planetary transmission assembly 22, a low-speed spur planetary transmission assembly 23, a spur internal gear ring 24, an oil-containing bearing 25, a baffle 26 and a retaining ring 27. The high-speed helical planetary transmission assembly 21 includes a high-speed helical internal gear ring 211, a high-speed helical planetary gear 212, and a high-speed planetary carrier 213; the intermediate-stage spur planetary transmission assembly 22 includes an intermediate-stage spur planetary gear 221, an intermediate-stage rotating shaft 222, and an intermediate-stage planetary carrier 223; the low-speed spur planetary transmission assembly 23 includes a gasket 231, a low-speed spur planetary gear 232, a low-speed rotating shaft 233, a low-speed planetary carrier 234, and an output shaft 235.

[0045] Specifically, please refer to Figures 1 to 6 The drive motor 11 includes a groove 111, the buckle 12 includes a matching hole 121 and a fixing buckle 122, and the end cover 13 includes a matching boss a 131 and a matching boss b 132. The spur gear ring 24 includes a groove a 241 that matches the end cover, a groove b 242 that matches the buckle, and a boss 243 that matches the buckle. The end cover 13 is fixed with the matching hole 121 of the buckle 12 and the groove 111 of the drive motor 11 through the matching boss a 131. Specifically, the matching method can be that the boss a 131 and the groove 111 are interference fit or fixed by glue. The groove a 241 of the spur gear ring 24 matches the matching boss a 131 of the end cover 13 for circumferential positioning, and the fixing buckle 122 of the buckle 12 matches the groove b 242 and the boss 243 of the spur gear ring 24 by bending to perform circumferential and axial positioning.

[0046] Specifically, please refer to Figures 1 to 7 , the high-speed helical gear ring 211 includes 9 positioning ribs 2111 and a first through hole 2112. The spur gear ring 24 includes an end face 244 that cooperates with the high-speed helical gear ring. The high-speed helical gear ring 211 is circumferentially positioned in cooperation with the tooth grooves of the spur gear ring 24 through the positioning ribs 2111 (the number of ribs is determined by the number of teeth of the spur gear ring, and the number of teeth of the spur gear ring in this embodiment is 45), and the end face of the high-speed helical gear ring 211 is in contact with the matching end face 244 of the spur gear ring 24 for axial positioning. In this embodiment, the tooth surface module of the high-speed helical gear planetary transmission is smaller than that of the intermediate stage and the low-speed stage. The intermediate stage sun gear 2132 of the high-speed planetary carrier 213 passes through the first through hole 2112 of the high-speed helical gear ring 211 and cooperates with the intermediate stage transmission.

[0047] Specifically, please refer to Figures 1 to 9The drive assembly 10 is fixed to the spur gear inner ring 24 of the transmission assembly 20 by the fixing buckle 122 of the buckle 12 and the end cover 13; the drive motor 11 inputs power to drive the drive sun gear 14 to rotate coaxially, and the drive sun gear 14 is meshed with the high-speed helical gear planetary gear 212 and the high-speed helical gear inner ring 211 for transmission. The high-speed helical gear inner ring 211 cooperates with the tooth grooves of the spur gear inner ring 24 through 9 positioning ribs 2111 for circumferential limitation. The high-speed helical gear planetary gear 212 is sleeved on the rotating shaft 2131 integrally formed on the high-speed planetary carrier 213, thereby driving the high-speed planetary carrier 213 to rotate; the intermediate sun gear integrally formed on the high-speed planetary carrier 213 The wheel 2132 meshes with the intermediate-stage spur planetary gear 221 and the spur inner gear ring 24 for transmission, the intermediate-stage rotating shaft 222 is fixed on the intermediate-stage planetary carrier 223, the intermediate-stage spur planetary gear 221 is sleeved on the intermediate-stage rotating shaft 222 and thus drives the intermediate-stage planetary carrier 223 to rotate; the low-speed sun gear 2232 integrally formed on the intermediate-stage planetary carrier 223 meshes with the low-speed spur planetary gear 232 for transmission, the low-speed rotating shaft 233 is fixed on the low-speed planetary carrier 234, the low-speed spur planetary gear 232 is sleeved on the low-speed rotating shaft 233 and thus drives the low-speed planetary carrier 234 to rotate, and the output shaft is fixed on the low-speed planetary carrier 234 to coaxially rotate and output power.

[0048] Specifically, please refer to Figures 1 to 9 A miniature low-noise transmission mechanism, a high-speed helical gear ring 211 and a spur gear ring 24 are integrally formed by injection molding, and the tooth shape of the positioning rib 2111 can be an involute or a transition curve, and the tooth side and the tooth groove of the spur gear ring 24 are circumferentially positioned. The high-speed planet carrier 213 is integrally formed by injection molding, including a rotating shaft 131 and an intermediate sun gear 2132. The intermediate planet carrier 223 is powder metallurgy injection molding, and the low-speed sun gear 2232. The low-speed planet carrier is powder metallurgy injection molding.

[0049] The gear transmission mechanism of the utility model adopts high-speed helical gear planetary transmission, which will effectively increase the overlap of high-speed planetary transmission, reduce the noise of the transmission mechanism and improve the transmission stability. The high-speed helical gear inner ring housing is positioned by ribs and spur gear inner ring, which is convenient for installation and ensures the compactness and precision of the overall transmission mechanism. The drive assembly and transmission assembly are positioned by the end cover and fixedly connected by buckles, which are detachable and convenient for parts replacement and inspection.

[0050] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A low-noise transmission device, characterized in that: The invention comprises a drive assembly (10) and a transmission assembly (20) which are connected to each other; the transmission assembly (20) comprises a high-speed helical planetary transmission assembly (21), an intermediate-stage spur-tooth planetary transmission assembly (22), a low-speed spur-tooth planetary transmission assembly (23) and a spur-tooth internal gear ring (24); the helical internal gear ring of the high-speed helical planetary transmission assembly (21) is connected to the spur-tooth internal gear ring (24); the intermediate-stage spur-tooth planetary transmission assembly (22) and the low-speed spur-tooth planetary transmission assembly (23) are respectively transmission-connected to the spur-tooth internal gear ring (24); and the high-speed helical planetary transmission assembly (21), the intermediate-stage spur-tooth planetary transmission assembly (22) and the low-speed spur-tooth planetary transmission assembly (23) are transmission-connected in sequence.

2. A low noise transmission device according to claim 1, characterized in that: The driving assembly (10) comprises a driving motor (11), a buckle (12), an end cover (13) and a driving sun gear (14); The driving motor (11) is fixed to the spur gear inner ring (24) via a buckle (12) and an end cover (13), and drives the driving sun gear (14) to output power via a transmission assembly (20).

3. A low noise transmission device according to claim 2, characterized in that: The high-speed helical gear planetary transmission assembly (21) comprises a high-speed helical gear inner ring (211), a high-speed helical gear planetary wheel (212) and a high-speed planetary carrier (213); The intermediate-stage spur-tooth planetary transmission assembly (22) comprises an intermediate-stage spur-tooth planetary gear (221), an intermediate-stage rotating shaft (222) and an intermediate-stage planetary carrier (223); The low-speed spur gear planetary transmission assembly (23) comprises a low-speed spur gear planetary wheel (232), a low-speed rotating shaft (233), a low-speed planetary carrier (234) and an output shaft (235); The driving motor (11) drives the driving sun gear (14) to rotate coaxially, the driving sun gear (14) is meshed with the high-speed helical gear internal ring (211) and the high-speed helical gear planetary gear (212) for transmission, the high-speed helical gear internal ring (211) cooperates with the spur gear internal ring (24) to perform circumferential positioning, and the high-speed helical gear planetary gear (212) is sleeved on the high-speed planetary carrier (213); The high-speed planet carrier (213) is meshed with the intermediate-stage spur-tooth planetary gear (221) and the spur-tooth inner gear ring (24) for transmission, the intermediate-stage rotating shaft (222) is fixed on the intermediate-stage planet carrier (223), and the intermediate-stage spur-tooth planetary gear (221) is sleeved on the intermediate-stage rotating shaft (222) to drive the intermediate-stage planet carrier (223) to rotate; The intermediate stage planet carrier (223) is meshed with the low-speed stage spur gear planetary gear (232) for transmission; the low-speed stage rotating shaft (233) is fixed on the low-speed stage planet carrier (234); the low-speed stage spur gear planetary gear (232) is sleeved on the low-speed stage rotating shaft (233) to drive the low-speed stage planet carrier (234) to rotate; and the output shaft (235) is fixed on the low-speed stage planet carrier (234).

4. A low noise transmission device according to claim 3, characterized in that: The high-speed helical gear internal ring (211) and the spur gear internal ring (24) are components integrally formed by injection molding; Part of the teeth of the inner teeth of the spur gear internal gear ring (24) are removed to form a positioning end face (244) for axial positioning with the end face of the high-speed helical gear internal gear ring (211); The outer shell of the high-speed helical gear internal gear ring (211) is provided with a plurality of positioning ribs (2111) and a first through hole (2112) for circumferential positioning in cooperation with the tooth grooves of the spur gear internal gear ring (24).

5. A low noise transmission device according to claim 4, characterized in that: The spur gear inner ring (24) is provided with a groove a (241), a groove b (242) and a boss (243) on the housing side close to the drive motor (11), respectively, for being fixedly connected to the buckle (12) and the end cover (13) respectively.

6. A low noise transmission device according to claim 3, characterized in that: The high-speed planet carrier (213) is a component formed by injection molding, and includes a rotating shaft (2131) and an intermediate sun gear (2132); The intermediate-stage planet carrier (223) is a component integrally formed by powder metallurgy injection molding, and comprises a second through hole (2231) for mounting a rotating shaft and a low-speed sun gear (2232).

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