Worm gear and motor

Abstract

This disclosure provides a worm gear and a motor. The worm gear includes an impeller and an output shaft. The output shaft has a insertion hole in its outer wall near the output end, extending radially along the output shaft. The impeller is sleeved on the end of the output shaft and partially located within the insertion hole, and is connected to the output shaft. The worm gear provided by this disclosure reduces the assembly difficulty of the impeller.

Description

Technical Field

[0001] This disclosure relates to the field of mechanical transmission technology, and in particular to a worm gear and an electric motor. Background Technology

[0002] An electric motor is a power output device that may include a gear sleeve and a worm gear. The worm gear includes an output shaft and an impeller mounted on the output shaft. The impeller has an external gear ring, which is located inside the gear sleeve and meshes with it. In operation, after the motor starts, the gear sleeve rotates, driving the impeller to rotate together so that torque is output through the output shaft.

[0003] In related technologies, impellers are typically mounted on output shafts via an interference fit. The impeller's center is interference-fitted onto the output shaft, and a locating pin, a metal structural component extending radially along the output shaft, is inserted into the shaft. This locating pin abuts against one side of the impeller, thus limiting the impeller's axial movement. However, this assembly method makes the assembly process rather cumbersome. Utility Model Content

[0004] This disclosure provides a worm gear and a motor, which can reduce the assembly difficulty of the impeller. The technical solution is as follows:

[0005] This disclosure provides a worm gear, which includes an impeller and an output shaft. The outer wall of the output shaft has a insertion hole that extends radially along the output shaft. The impeller includes an impeller body and an insert portion. The impeller body is sleeved on the output shaft and connected to the output shaft. The insert portion is located in the insertion hole and fits against the hole wall.

[0006] In another implementation of this disclosure, the impeller body and the output shaft are metal insert injection molded parts.

[0007] In another implementation of this disclosure, the insertion hole is a through hole, and the insertion hole passes through the axis of the output shaft.

[0008] In yet another implementation of this disclosure, the impeller is an engineering plastic structural component.

[0009] In another implementation of this disclosure, the impeller body includes a hub, which is sleeved on the output shaft, and the interior of the hub is provided with an inwardly extending limiting protrusion; the outer wall of the output shaft has a limiting groove for accommodating the limiting protrusion, and the limiting groove is located on one side of the insertion hole.

[0010] In another implementation of this disclosure, there are two limiting protrusions, which are spaced apart along the axial direction of the hub; there are two limiting grooves, which are located on both sides of the injection hole along the axial direction of the output shaft, and each limiting groove corresponds to one of the two limiting protrusions.

[0011] In another implementation of this disclosure, the impeller body further includes an external gear ring and a plurality of blades, the external gear ring being coaxially sleeved on the outside of the hub; the plurality of blades are spaced apart along the circumference of the hub between the hub and the external gear ring, and each blade is connected to the hub and the external gear ring respectively.

[0012] In another implementation of this disclosure, the teeth in the external gear ring are helical teeth, and the length direction of the tooth edge of the helical teeth forms an acute angle with the axial direction of the external gear ring.

[0013] In another implementation of this disclosure, the output shaft has a connecting groove at one end away from the impeller, the connecting groove extending radially inward from the outer wall of the output shaft to the middle of the output shaft.

[0014] On the other hand, this disclosure also provides an electric motor, which includes a gear sleeve and a worm gear, wherein the gear sleeve is connected to the worm gear in a driving connection; the worm gear is the worm gear described above.

[0015] The beneficial effects of the technical solutions provided in this disclosure are:

[0016] When the worm gear provided in this embodiment is used in a motor as a transmission device, since the worm gear includes an impeller and an output shaft, and the outer wall of the output shaft is provided with a plug-in hole, the impeller includes an impeller body and an insert part. The impeller body is sleeved outside the output shaft and connected to the output shaft, and the insert part is located in the plug-in hole and fits against the hole wall of the plug-in hole. Therefore, the impeller body can be sleeved outside the output shaft, and the insert part can be inserted into the output shaft through the plug-in hole, so as to limit the circumferential and axial movement of the impeller, facilitate the installation of the impeller on the output shaft, and simplify the assembly process of the impeller.

[0017] In other words, the worm gear structure in this embodiment is simple, and the impeller is very easy to assemble with the output shaft. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a worm gear structure provided in an embodiment of the present disclosure;

[0020] Figure 2 for Figure 1 Unsectioned side view;

[0021] Figure 3 This is a schematic diagram of another worm gear structure provided in an embodiment of the present disclosure;

[0022] Figure 4 for Figure 3 Unsectioned side view;

[0023] Figure 5 This is a schematic diagram of the structure of an output shaft provided in an embodiment of the present disclosure.

[0024] The symbols in the diagram represent the following meanings:

[0025] 1. Impeller; 11. Impeller body; 111. Hub; 1111. Limiting protrusion; 112. External gear ring; 113. Blade; 114. Connecting plate; 12. Embedded part;

[0026] 2. Output shaft; 20. Plug-in hole; 200. Limiting groove; 201. Connecting groove; 202. Shaft shoulder. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0028] This disclosure provides a worm gear, such as... Figure 1 As shown, the worm gear includes an impeller 1 and an output shaft 2. The outer wall of the output shaft 2 is provided with a insertion hole 20, which extends radially along the output shaft 2.

[0029] The impeller 1 includes an impeller body 11 and an insert 12. The impeller body 11 is sleeved outside the output shaft 2 and connected to the output shaft 2. The insert 12 is located in the insertion hole 20 and fits against the hole wall of the insertion hole 20.

[0030] When the worm gear provided in this embodiment is used in a motor as a transmission device, since the worm gear includes an impeller 1 and an output shaft 2, and the outer wall of the output shaft 2 is provided with a insertion hole 20, the impeller 1 includes an impeller body 11 and an insert part 12. The impeller body 11 is sleeved on the outside of the output shaft 2 and connected to the output shaft 2. The insert part 12 is located in the insertion hole 20 and fits against the hole wall of the insertion hole 20. Therefore, the impeller body 11 can be sleeved on the outside of the output shaft 2, and the insertion hole 20 allows the insert part 12 to be inserted into the output shaft 2, so as to limit the circumferential and axial movement of the impeller 1, facilitate the installation of the impeller 1 on the output shaft 2, and simplify the assembly process of the impeller 1.

[0031] In this embodiment, the impeller 1 is a non-metallic structural component. Because the impeller 1 is a non-metallic structural component, the connection performance between the impeller 1 and the output shaft 2 will not be weakened due to corrosion or other reasons, thereby ensuring that the transmission power between the impeller 1 and the output shaft 2 will not decrease, and further extending the service life of the worm gear.

[0032] In other words, the worm gear structure in this embodiment is simple, and the impeller 1 is very easy to assemble with the output shaft 2. Moreover, the firmness of the impeller 1 on the output shaft 2 will not be affected by factors such as easy corrosion of the locating pin, thus ensuring that the transmission power with the output shaft will not decrease.

[0033] Optionally, the impeller 1 and the output shaft 2 are metal insert injection molded parts.

[0034] In the above implementation, the impeller 1 and output shaft 2 are metal insert injection molded parts, allowing the impeller 1 structure to be directly injection molded outside the output shaft 2. During impeller 1 injection molding, the output shaft 2 is pre-embedded in an appropriate position in the mold before injection molding the impeller 1. The injection fluid flows into and fills the insertion hole 20. After mold opening, the fluid embedded in the insertion hole 20 forms an insert 12 within it. The output shaft 2 is then naturally encased by the cooled and solidified plastic. Thus, the output shaft 2 and impeller 1 form an integral structure, enabling the output shaft 2 to synchronously drive the impeller 1 to rotate and perform a transmission function. Furthermore, since the impeller 1 and output shaft 2 are metal insert injection molded parts, the assembly process between the impeller 1 and output shaft 2 is further simplified, improving assembly efficiency.

[0035] In other examples, the impeller 1 and the output shaft 2 can also be molded separately. For example, when the impeller 1 is injection molded and then press-fitted onto the cast output shaft 2, the insert 12 is simultaneously inserted into the insertion hole 20.

[0036] In this embodiment, the impeller 1 is an engineering plastic structural component.

[0037] For example, impeller 1 can be made of polypropylene (PP), polyamide 66 or nylon 66 (PA66), or polyphenylene sulfide (PPS). This gives impeller 1 advantages such as corrosion resistance, insulation, low noise, and light weight.

[0038] Optionally, the insertion hole 20 is a through hole, and the insertion hole 20 passes through the axis of the output shaft 2.

[0039] In the above implementation, the insertion hole 20 is set as a through hole, which can extend the length of the insertion hole 20 as much as possible, thereby increasing the contact area between the output shaft 2 and the impeller 1, thereby improving the connection strength between the two and preventing them from separating.

[0040] In other examples, the insertion hole 20 can also be a blind hole, and the number of insertion holes 20 can be two, three, etc. This can also further increase the contact area between the output shaft 2 and the impeller 1, thereby improving the connection strength between the two.

[0041] Optionally, the impeller body 11 includes a hub 111, which is fitted over the output shaft 2, and the hub 111 has an inwardly extending limiting protrusion 1111 inside. The outer wall of the output shaft 2 has a limiting groove 200 for accommodating the limiting protrusion 1111. The limiting groove 200 is located on one side of the insertion hole 20.

[0042] In the above implementation, the hub 111 is used to fit over the output shaft 2. At the same time, the cooperation of the limiting protrusion 1111 and the limiting groove 200 can not only further increase the contact area between the output shaft 2 and the impeller 1 and improve the connection strength between the two, but also further limit the axial direction of the impeller 1 and improve the connection stability of the impeller 1 assembled on the output shaft 2.

[0043] Optionally, there are two limiting protrusions 1111, which are distributed at intervals along the axial direction of the hub 111.

[0044] There are two limiting grooves 200. The two limiting grooves 200 are located on both sides of the insertion hole 20 along the axis of the output shaft 2. The two limiting grooves 200 correspond one-to-one with the two limiting protrusions 1111.

[0045] In the above implementation, the setting of two limiting grooves 200 and two limiting protrusions 1111 can further increase the contact area between the output shaft 2 and the impeller 1 and improve the connection strength between them. Moreover, it can also further increase the axial limiting effect on the impeller 1, thereby improving the connection stability of the impeller 1 assembled on the output shaft 2.

[0046] In other examples, the number of limiting slots 200 and limiting protrusions 1111 can also be different, such as three.

[0047] In this embodiment, the limiting protrusion 1111 is an annular flange, and correspondingly, the limiting groove 200 is an annular groove. This further increases the contact area between the output shaft 2 and the impeller 1, thereby improving the connection strength between them.

[0048] Figure 2 for Figure 1 Unsectioned side view (i.e.) Figure 1 for Figure 2 (Cross view along the AA direction) combined Figure 2 The impeller body 11 also includes an external gear ring 112 and multiple blades 113, with the external gear ring 112 coaxially sleeved on the outside of the hub 111.

[0049] Multiple blades 113 are spaced circumferentially between the hub 111 and the outer gear ring 112, and each blade 113 is connected to the hub 111 and the outer gear ring 112 respectively.

[0050] In the above implementation, the blade 113 is used to connect the hub 111 and the external gear ring 112 together. When the external gear ring 112 rotates, under the action of the blade 113, the hub 111 can rotate synchronously with the output shaft 2, and then output power through the output shaft 2.

[0051] Optionally, the teeth in the external gear ring 112 are helical teeth, and the length direction of the tooth edge in the helical teeth forms an acute angle with the axial direction of the external gear ring 112.

[0052] In the above implementation, the teeth of the external gear ring 112 are helical teeth, meaning that the length direction of the tooth edge in the external gear ring 112 is inclined relative to the external gear ring 112. Setting the teeth of the external gear ring 112 as helical teeth can increase the meshing area with other gear sleeves, thereby improving the transmission power and reducing noise.

[0053] Optionally, in order to further increase the structural strength of the impeller body 11, the impeller body 11 also includes a plurality of connecting plates 114, each connecting plate 114 being located between two adjacent blades 113 and connected to the two adjacent blades 113 respectively.

[0054] Figure 3 This is a schematic diagram of another worm gear structure provided in an embodiment of this disclosure, combined with... Figure 3 In this embodiment of the present disclosure, the tooth tips of the teeth in the external gear ring 112 are either flat or curved. This allows for the avoidance of tooth tip cracking due to localized high stress at sharp corners. Furthermore, flat tooth tips can store more lubricating oil, which is beneficial for tooth surface lubrication and reduces wear.

[0055] Figure 4 for Figure 3 Unsectioned side view (i.e.) Figure 3 for Figure 4 (Cross-sectional view along the BB direction), combined with Figure 4 The tooth tips in the external gear ring 112 are curved surfaces, which can be concave inwards radially towards the gear ring from the middle of the tooth tip relative to the two ends along the length of the tooth edge. This can further increase the storage capacity of lubricating oil, and form a stable oil film when meshing with the gear sleeve of the motor, reducing tooth surface wear.

[0056] In other examples, such as Figure 2 As shown, the tooth tips of the teeth in the external gear ring 112 can also be pointed.

[0057] Figure 5 This is a schematic diagram of the structure of an output shaft provided in an embodiment of the present disclosure, combined with... Figure 5 Optionally, the output shaft 2 has a connecting groove 201 at the end away from the impeller 1. The connecting groove 201 extends radially inward from the outer wall of the output shaft 2 to the middle of the output shaft 2.

[0058] In the above implementation, the arrangement of the connecting groove 201 can be used to assemble the connecting pin connected to the output shaft of the motor, thereby drivingly connecting the output shaft 2 and the output shaft of the motor together through the connecting pin.

[0059] For example, when connecting the output shaft 2 to other equipment, the end of the output shaft 2 away from the impeller 1 can be inserted into the other equipment, and the connecting pin portion connected to the other equipment can be interference-fitted into the connecting groove 201.

[0060] In other examples, output shaft 2 can also be connected to other devices via couplings or the like.

[0061] Optionally, to further facilitate the transmission connection of the output shaft 2 with other equipment, a plurality of shoulders 202 are provided on the end of the output shaft 2 away from the impeller 1. The plurality of shoulders 202 are spaced apart along the axial direction of the output shaft 2 between the connecting groove 201 and the impeller 1. The shoulders 202 are used to engage with the protrusions on the inner wall of other equipment to achieve axial positioning between the output shaft 2 and other equipment.

[0062] In addition, in order to facilitate the connection of the output shaft 2 with other devices, a shoulder 202 is also provided on the output shaft 2 on the side of the impeller 1 away from the output shaft of the motor.

[0063] The assembly process of the worm gear provided in the embodiments of this disclosure is briefly described below:

[0064] When a worm gear needs to be formed, the output shaft 2 is pre-embedded in the appropriate position of the mold, and then the impeller 1 is injection molded. The fluid used for injection molding flows into the insertion hole 20 at the same time as entering the mold, and fills the insertion hole 20. After the fluid fills the mold, it solidifies and is opened. The fluid embedded in the insertion hole 20 forms an embedded part 12 in the insertion hole 20. The fluid embedded in the limiting groove 200 naturally forms a limiting protrusion 1111. The output shaft 2 is naturally encased by the cooled and solidified fluid. That is, the output shaft 2 and the impeller 1 form an integral structure.

[0065] Then, the worm gear is connected to the motor's gear sleeve drive. After starting the motor, output shaft 2 can output power.

[0066] In the above-mentioned worm gear, the limiting pin can be omitted, and instead, the insertion hole 20 can be directly provided on the output shaft 2. This allows the fluid particles used for injection molding of the impeller 1 to flow into and fill the insertion hole 20, becoming an integral part of the impeller body 11 and providing a transmission function. This not only simplifies the structure of the worm gear and makes it more economical, but also reduces the precision requirements for the machining of the insertion hole 20. It also eliminates the riveting process, using injection molding instead, resulting in high assembly reliability between the impeller 1 and the output shaft 2. Furthermore, the output shaft 2 is no longer under stress, reducing deformation. Moreover, since the impeller 1 is a non-metallic structural component, corrosion will not affect the assembly between the impeller 1 and the output shaft 2.

[0067] On the other hand, this disclosure also provides an electric motor, which includes a gear sleeve and a worm gear, with the gear sleeve and the worm gear being connected in a driving connection. The worm gear is the worm gear described above.

[0068] The above motors have the same beneficial effects as the aforementioned worm gears, which will not be repeated here.

[0069] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A worm gear, characterized in that, The worm gear includes an impeller (1) and an output shaft (2). The outer wall of the output shaft (2) is provided with a insertion hole (20), which extends radially along the output shaft (2). The impeller (1) includes an impeller body (11) and an insert (12). The impeller body (11) is sleeved outside the output shaft (2) and connected to the output shaft (2). The insert (12) is located in the insertion hole (20) and fits against the hole wall of the insertion hole (20). The impeller (1) and the output shaft (2) are metal insert injection molded parts. The impeller body (11) includes a hub (111). The hub (111) is sleeved on the output shaft (2). The hub (111) has an inwardly extending limiting protrusion (1111) inside. The outer wall of the output shaft (2) has a limiting groove (200) for accommodating the limiting protrusion (1111), the limiting groove (200) being located on one side of the insertion hole (20).

2. The worm gear according to claim 1, characterized in that, The insertion hole (20) is a through hole, and the insertion hole (20) passes through the axis of the output shaft (2).

3. The worm gear according to claim 1, characterized in that, The impeller (1) is an engineering plastic structural component.

4. The worm gear according to claim 1, characterized in that, There are two limiting protrusions (1111), and the two limiting protrusions (1111) are distributed at intervals along the axial direction of the hub (111); There are two limiting grooves (200), and the two limiting grooves (200) are located on both sides of the insertion hole (20) along the axial direction of the output shaft (2). The two limiting grooves (200) correspond one-to-one with the two limiting protrusions (1111).

5. The worm gear according to claim 1, characterized in that, The impeller body (11) also includes an external gear ring (112) and multiple blades (113), wherein the external gear ring (112) is coaxially sleeved outside the hub (111); The plurality of blades (113) are spaced circumferentially between the hub (111) and the outer gear ring (112), and each blade (113) is connected to the hub (111) and the outer gear ring (112) respectively.

6. The worm gear according to claim 5, characterized in that, The teeth in the external gear ring (112) are helical teeth, and the length direction of the tooth edge in the helical teeth forms an acute angle with the axial direction of the external gear ring (112).

7. The worm gear according to any one of claims 1-6, characterized in that, The output shaft (2) has a connecting groove (201) at one end away from the impeller (1), the connecting groove (201) extending radially inward from the outer wall of the output shaft (2) to the middle of the output shaft (2).

8. An electric motor, characterized in that, The motor includes a gear sleeve and a worm gear, and the gear sleeve is connected to the worm gear in a driving connection. The worm gear is the worm gear according to any one of claims 1-7.

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