Speed reduction unit and motor device

Abstract

The utility model provides a speed reduction unit with both product performance and production efficiency and a motor device provided with the speed reduction unit. A speed reduction unit (1) is provided with: a gear box (1B) provided with a stationary shaft (10); and a rotating body (1R) having a rotating shaft (20) rotatably fitted to the fixed shaft through a hollow portion (20H) formed therein, and a worm gear portion (30) meshing with the worm gear portion, the worm gear portion (30) being engaged with the worm gear portion (40), and the worm gear portion (30) being engaged with the worm gear portion (40) and the worm gear portion (30) being engaged with the worm gear portion (40). The fixing shaft sequentially comprises a small-diameter part (11), a first step part (12), a middle-diameter part (13), a second step part (14) and a large-diameter part (15) from the front end, the hollow part sequentially comprises a small hole part (21), a transition hole part (22) and a large hole part (23) from the front end, the first step part is sleeved with a sealing ring (50) capable of elastically deforming, and the sealing ring makes contact with the small-diameter part and the small hole part.

Description

Technical Field

[0001] The present disclosure relates to the field of small motors, and in particular, to a reduction unit and a motor device having the reduction unit. Background Art

[0002] Today, small motors, typified by motors with reduction units, are widely used in a variety of equipment, including home appliances, automotive equipment, manufacturing equipment, precision instruments, and information technology. This demand for performance and production efficiency in reduction units and motors is increasing.

[0003] Patent document 1 discloses a deceleration unit such as Figure 6 As schematically shown, the reduction unit includes a gearbox and a rotating body, the gearbox is provided with a fixed shaft, the rotating body has a rotating shaft and a worm wheel portion that rotates together with the rotating shaft, and when the gearbox accommodates a worm portion serving as an input shaft of the motor, the rotating body is installed in the gearbox in the direction indicated by the arrow in such a way that the fixed shaft provided with an O-ring is inserted into the hollow portion of the rotating shaft until the worm portion accommodated in the gearbox is fully meshed with the worm wheel portion of the rotating body.

[0004] However, in Patent Document 1, during the process of inserting the fixed shaft into the hollow portion of the rotating shaft, the O-ring will always be in contact with the hollow portion and generate frictional resistance, and a large force needs to be applied to the rotating body to overcome the frictional resistance. As a result, when the worm portion contacts the worm wheel portion of the rotating body, the impact force between the two is large, which will generate a large noise and even cause damage to the teeth of the worm wheel portion and / or the worm portion. In particular, when an automated device is used to assemble the fixed shaft relative to the rotating shaft, tooth damage or poor meshing when the worm portion contacts the worm wheel portion of the rotating body will cause the machine to pause, reducing production efficiency. Moreover, an operator is required to check the status of the tooth damage and release the machine pause, thereby increasing labor costs. In addition, since there is no lubricant storage portion near the contact position between the rotating shaft and the sealing ring, the frictional resistance between the rotating shaft and the sealing ring cannot be alleviated when the rotating shaft of the reduction unit rotates around the fixed shaft.

[0005] Therefore, there is still room for further improvement in the structure of the reduction unit in Patent Document 1, and a reduction unit that takes both product performance and production efficiency into consideration is highly anticipated.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent No. 6308627 Utility Model Content

[0009] The present disclosure has been made in consideration of the above-mentioned circumstances, and an object thereof is to provide a reduction unit that achieves both product performance and production efficiency, and a motor device including the reduction unit.

[0010] The reduction unit disclosed in the present invention comprises: a gear box, which is provided with a fixed shaft; and a rotating body, which has a rotating shaft and a worm wheel portion that rotates together with the rotating shaft, the rotating shaft being rotatably sleeved on the fixed shaft through a hollow portion formed inside, the gear box accommodating the rotating body and the worm portion serving as the input shaft of the motor, the worm wheel portion meshing with the worm portion, the fixed shaft including a small diameter portion, a first step portion, a middle diameter portion, a second step portion and a large diameter portion in sequence from the front end, the hollow portion including a small hole portion, a transition hole portion and a large hole portion in sequence from the front end, an elastically deformable sealing ring is sleeved on the first step portion, and the sealing ring is in contact with the small diameter portion and the small hole portion.

[0011] According to the reduction unit of the present disclosure, the large hole portion is in contact with the large diameter portion, and the transition hole portion and the second step portion are opposed to each other with a certain gap therebetween.

[0012] According to the speed reduction unit of the present disclosure, the small hole portion is in contact with the middle diameter portion.

[0013] According to the reduction unit disclosed herein, when the sealing ring is sleeved on the first step portion, the inner diameter of the large hole portion is larger than the outer diameter of the sealing ring.

[0014] According to the reduction unit of the present disclosure, when the sealing ring is sleeved on the first step portion and is not in contact with the rotating shaft, the inner diameter of the small hole portion is smaller than the outer diameter of the sealing ring.

[0015] According to the speed reduction unit of the present disclosure, the first step portion is smoothly connected to the small-diameter portion and the middle-diameter portion.

[0016] According to the reduction unit disclosed herein, in a cross section obtained by cutting the reduction unit along a plane including the axis of the fixed shaft, the transition hole portion and the second step portion are both linear, and the angles relative to the axis are between 15 and 60 degrees.

[0017] According to the reduction unit disclosed in the present invention, an annular flange portion protruding toward the fixed shaft is further provided at the front end of the small hole portion, the annular flange portion, the small hole portion, the small diameter portion and the first step portion define a first space for accommodating the sealing ring, and the transition hole portion, the large hole portion, the medium diameter portion and the second step portion define a second space, and in the direction along the axis of the fixed shaft, the length of the first space is 1.1-1.2 times the length of the second space.

[0018] According to the reduction gear unit of the present disclosure, the worm gear portion is formed as a helical gear.

[0019] A motor device disclosed in the present disclosure includes: any one of the above-mentioned reduction units; and the motor connected to the reduction unit.

[0020] According to the reduction gear unit and the motor device disclosed herein, it is possible to provide a reduction gear unit that achieves both product performance and production efficiency, and a motor device including the reduction gear unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0022] Figure 1 is a cross-sectional view showing a reduction unit of the present disclosure;

[0023] Figure 2 is a partially enlarged cross-sectional view showing a reduction gear unit of the present disclosure;

[0024] Figure 3 is a partially enlarged cross-sectional view showing a reduction gear unit of the present disclosure;

[0025] Figure 4 is a cross-sectional view showing the reduction unit during assembly of the present disclosure;

[0026] Figure 5 is a cross-sectional view showing a reduction unit in an assembled state according to the present disclosure;

[0027] Figure 6 is a cross-sectional view showing a conventional reduction gear unit.

[0028] Description of Reference Numerals

[0029] 1 reduction unit;

[0030] 1B gearbox;

[0031] 10 fixed shaft; 10X axis; 11 small diameter portion; 12 first step portion; 13 middle diameter portion; 14 second step portion; 15 large diameter portion;

[0032] 1R rotating body; 20 rotating shaft; 20H hollow portion; 21 small hole portion; 22 transition hole portion; 23 large hole portion; 20F annular flange portion; 30 worm gear portion;

[0033] 40 worm gear;

[0034] 50 sealing ring;

[0035] S1 first space;

[0036] S2 Second space. DETAILED DESCRIPTION

[0037] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present disclosure. In the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0038] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "include," "comprising," etc. used herein indicate the presence of the features, operations, and / or components, but do not exclude the presence or addition of one or more other features, operations, or components.

[0039] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0040] When using expressions such as "at least one of A, B, and C," they should generally be interpreted according to the meaning commonly understood by those skilled in the art (for example, "a device having at least one of A, B, and C" should include but is not limited to devices having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.). Those skilled in the art should also understand that any transitional conjunctions and / or phrases that essentially represent two or more optional items, whether in the specification, claims, or drawings, should be understood to include the possibility of including one of these items, either one of these items, or both of these items. For example, the phrase "A or B" should be understood to include the possibility of "A" or "B," or "A and B."

[0041] An embodiment of the present disclosure provides a reduction unit. The reduction unit includes a gearbox and a rotating body. The gearbox is provided with a fixed shaft. The rotating body has a rotating shaft and a worm wheel portion that rotates together with the rotating shaft, and the rotating shaft is rotatably sleeved on the fixed shaft through a hollow portion formed inside. The gearbox accommodates the rotating body and the worm portion serving as the input shaft of the motor. The worm wheel portion is engaged with the worm portion. The fixed shaft includes a small diameter portion, a first step portion, a middle diameter portion, a second step portion and a large diameter portion in sequence from the front end. The hollow portion includes a small hole portion, a transition hole portion and a large hole portion in sequence from the front end. A sealing ring that can be elastically deformed is sleeved on the first step portion, and the sealing ring is in contact with the small diameter portion and the small hole portion.

[0042] This disclosure mainly focuses on the arrangement of the fixed shaft in the gearbox and the rotating shaft in the rotating body. The other parts of the reduction unit can adopt the usual structure. Therefore, the following description of the detailed structure of the motor device, the cover of the gearbox, etc. is omitted. Figures 1 to 3 The structure of the reduction unit of the present disclosure will be described.

[0043] Figure 1 1 is a cross-sectional view showing the reduction unit 1 of the present disclosure, showing a cross section obtained by cutting the reduction unit along a plane including the axis of the fixed shaft. Figure 1 As shown, the reduction unit 1 includes a gearbox 1B and a rotating body 1R. The gearbox 1B comprises a bottomed cylindrical housing 1B-1 and a cover 1B-2 covering the housing 1B-1. The housing 1B-1 includes a fixed shaft 10 extending from the center of its inner bottom surface. The fixed shaft 10 may be integrally formed with the housing 1B-1.

[0044] The rotating body 1R includes a rotating shaft 20 and a worm gear 30 that rotates together with the rotating shaft 20. The rotating shaft 20 has a hollow portion 20H formed therein, and is rotatably fitted around the fixed shaft 10 via the hollow portion 20H.

[0045] The gear box 1B houses the rotating body 1R and a worm portion 40 serving as an input shaft of the motor. The worm wheel portion 30 meshes with the worm portion 40 .

[0046] The fixed shaft 10 is fixed from the front end ( Figure 1 Starting from the upper end (in the drawing) in the figure, the fixed shaft 10 comprises, in order, a small diameter portion 11, a first step 12, a middle diameter portion 13, a second step 14, and a large diameter portion 15. The small diameter portion 11, middle diameter portion 13, and large diameter portion 15 are all cylindrical, with their diameters increasing in sequence. The first step 12 connects the small diameter portion 11 and the middle diameter portion 13, while the second step 14 connects the middle diameter portion 13 and the large diameter portion 15. In other words, the fixed shaft 10 as a whole has a two-step structure.

[0047] The hollow portion 20H includes a small hole portion 21, a transition hole portion 22, and a large hole portion 23 in order from the front end. The small hole portion 21 and the large hole portion 23 are both formed into a cylindrical shape, and the diameter increases in sequence. The transition hole portion 22 connects the small hole portion 21 and the large hole portion 23. The shape of the transition hole portion 22 is not particularly limited. As an example, it is formed as Figure 1 The tapered hole shape is shown.

[0048] A sealing ring 50 is provided on the first step portion 12. In this embodiment, the sealing ring 50 is an O-ring capable of elastic deformation, for example, made of rubber. Figure 1), the sealing ring 50 contacts the small diameter portion 11 and the small hole portion 21, and performs a liquid-tight seal between the fixed shaft 10 and the rotating shaft 20, thereby preventing foreign matter, moisture, etc. from entering the reduction unit 1 from the outside while allowing the rotation of the rotating shaft 20.

[0049] Figure 2 as well as Figure 3 This is a partially enlarged cross-sectional view showing a portion of the fixed shaft 10 and the rotating shaft 20 of the reduction unit 1. Figure 1 The dotted circle C portion is shown enlarged, and the cross-sectional view of this portion is bilaterally symmetrical.

[0050] like Figure 2 as well as Figure 3 As shown, the large hole portion 23 contacts the large diameter portion 15 , the transition hole portion 22 faces the second step portion 14 with a certain gap therebetween, and the small hole portion 21 contacts the medium diameter portion 13 .

[0051] Furthermore, the first step portion 12 is smoothly connected to the small-diameter portion 11 and the middle-diameter portion 13 .

[0052] exist Figure 2 In the cross-sectional view shown, the transition hole portion 22 and the second step portion 14 are both linear. Furthermore, the angle α of the second step portion 14 relative to the axis 10X is between 15 and 60 degrees, and the angle β of the transition hole portion 22 relative to the axis 10X is also between 15 and 60 degrees.

[0053] Moreover, if Figure 3 As shown, the rotating shaft 20 is further provided with an annular flange portion 20F protruding toward the fixed shaft 10 at the front end of the small hole portion 21. The annular flange portion 20F, the small hole portion 21, the small diameter portion 11 and the first step portion 12 define a first space S1, which is used to accommodate the sealing ring 50. Figure 2 As shown, the transition hole portion 22 , the large hole portion 23 , the middle diameter portion 13 and the second step portion 14 define a second space S2 , which is filled with lubricant.

[0054] Then, if Figure 3 As shown, along the axis 10X of the fixed shaft 10, the length L1 of the first space S1 is preferably 1.1-1.2 times the length L2 of the second space S2. Thus, when the rotating shaft 20 rotates about the fixed shaft 10, the lubricant in the second space S2 can appropriately reduce the frictional resistance between the sealing ring 50 and the small diameter portion 11 and the small hole portion 21.

[0055] Furthermore, the worm wheel portion 30 is preferably formed as a helical gear to better mesh with the worm portion 40 .

[0056] In order to better understand the structure and effect of the present disclosure, Figure 4-5 The assembly process of the reduction unit 1 will be described.

[0057] In brief, the present disclosure is to rotate the rotating body 1R along the axis 10X (i.e., Figure 4 The worm wheel 30 and the worm gear 40 of the rotating body 1R are completely meshed with each other.

[0058] When the sealing ring 50 is sleeved on the first step 12, the inner diameter of the large hole 23 of the rotating shaft 20 is larger than the outer diameter of the sealing ring 50. Therefore, when the rotating body 1R is first inserted into the fixed shaft 10, the large hole 23 does not contact the sealing ring 50, and no friction resistance is generated therebetween.

[0059] When the rotating body 1R is further inserted into the fixed shaft 10 until the worm wheel portion 30 and the worm portion 40 of the rotating body 1R begin to mesh, the large hole portion 23 still does not contact the seal ring 50 .

[0060] Therefore, when the worm wheel 30 and worm 40 begin to mesh, they are not affected by the load generated by overcoming frictional resistance, thereby preventing a large impact force between the two. This effectively avoids noise and prevents damage to the teeth of the worm wheel and / or worm. In particular, when assembling the rotating body 1R relative to the fixed shaft 10 using automated equipment, the force applied to the rotating body 1R can be controlled, significantly reducing tooth damage or poor meshing when the worm wheel 30 and worm 40 come into contact, reducing machine downtime and improving production efficiency.

[0061] When the worm wheel 30 and the worm 40 begin to mesh, the seal ring 50 mounted on the first step 12 is not in contact with the rotating shaft 20. In this state, the inner diameter of the small hole 21 of the rotating shaft 20 is smaller than the outer diameter of the seal ring 50.

[0062] Figure 4 The reduction unit 1 of the present disclosure is shown during assembly, and is shown when the small hole portion 21 of the rotating shaft 20 is about to contact the seal ring 50. At this time, although the worm wheel portion 30 and the worm portion 40 are not fully engaged, the engagement state between the two is stable.

[0063] After the worm wheel 30 and worm 40 begin to mesh, the rotating body 1R is inserted further onto the fixed shaft 10. The small hole 21 of the rotating shaft 20 then comes into contact with the sealing ring 50, causing the sealing ring 50 to be elastically deformed by the small hole 21. Although frictional resistance is generated between the sealing ring 50 and the small hole 21 at this point, since the meshing between the worm wheel 30 and worm 40 is already stable, this frictional resistance does not affect the assembly of the rotating body 1R onto the fixed shaft 10.

[0064] As described above, the first step portion 12 of the fixed shaft 10 preferably smoothly connects with the small-diameter portion 11 and the middle-diameter portion 13. This ensures that, during assembly of the rotating body 1R relative to the fixed shaft 10, the entire area of ​​the fixed shaft 10 that may come into contact with the rotating shaft 20 is free of protruding edges or corners. This prevents any portion of the fixed shaft 10 from colliding with the inner wall of the hollow portion 20H of the rotating shaft 20, ensuring smooth insertion of the rotating shaft 20 into the fixed shaft 10.

[0065] Furthermore, after the worm wheel 30 and worm 40 of the rotating body 1R are fully engaged, the cover 1B-2 is used to cover the gearbox 1B's main body 1B-1 and the worm wheel 30 of the rotating body 1R. However, this process can be accomplished using a known cover structure and installation method, and will not be described in detail here.

[0066] Figure 5 FIG. 1 shows the reduction unit 1 of the present disclosure in an assembled state. Figure 5 As shown, when the reduction unit 1 is assembled, the large hole portion 23 of the rotating shaft 20 contacts the large diameter portion 15 of the fixed shaft 10, the transition hole portion 22 of the rotating shaft 20 faces the second step portion 14 of the fixed shaft 10 with a certain gap therebetween, and the small hole portion 21 of the rotating shaft 20 contacts the middle diameter portion 13 of the fixed shaft 10. Thus, the transition hole portion 22, the large hole portion 23, the middle diameter portion 13, and the second step portion 14 define a second space S2, which can be filled with lubricant.

[0067] Furthermore, in a cross-section of the reduction unit 1 taken along a plane including the axis 10X of the fixed shaft 10, the transition hole 22 and the second step 14 are preferably both linear. Furthermore, the angle α of the second step 14 relative to the axis 10X is between 15 and 60 degrees, and the angle β of the transition hole 22 relative to the axis 10X is also between 15 and 60 degrees. This improves the drawability of the fixed shaft 10 and the assembly and retention of the seal ring 50. Furthermore, the second space S2 can be maintained in an appropriate shape, which helps retain the lubricant.

[0068] Furthermore, as described above, the rotating shaft 20 is further provided with an annular flange portion 20F at the front end of the small hole portion 21, which protrudes toward the fixed shaft 10. The annular flange portion 20F, the small hole portion 21, the small-diameter portion 11, and the first step portion 12 define a first space S1, which is used to accommodate the sealing ring 50. Due to the compression between the small hole portion 21 and the small-diameter portion 11, the sealing ring 50 elastically deforms, creating a liquid-tight seal between the fixed shaft 10 and the rotating shaft 20. Therefore, the first space S1 can also be called an anti-infiltration space, which prevents foreign matter, moisture, etc. from entering the reduction gear unit 1 from the outside while allowing the rotating shaft 20 to rotate.

[0069] Since the first space S1 and the second space S2 are arranged adjacent to each other, when the rotating shaft 20 rotates around the fixed shaft 10, the lubricant in the second space S2 can be used to alleviate the friction resistance between the sealing ring 50 in the first space S1 and the small diameter portion 11 and the small hole portion 21, which helps to improve the performance of the reduction unit 1.

[0070] like Figure 3 As shown, along the axis 10X of the fixed shaft 10, the length L1 of the first space S1 is preferably 1.1-1.2 times the length L2 of the second space S2. Thus, when the rotating shaft 20 rotates about the fixed shaft 10, the lubricant in the second space S2 can appropriately mitigate the frictional resistance.

[0071] In summary, according to the reduction unit 1 disclosed herein, when the worm wheel portion 30 and the worm portion 40 begin to mesh, they are not affected by the load generated by overcoming frictional resistance, thereby preventing a large impact force between the two, effectively avoiding noise and preventing damage to the teeth of the worm wheel portion and / or worm portion. In particular, when assembling the rotating body 1R relative to the fixed shaft 10 using an automated device, the force applied to the rotating body 1R can be controlled, thereby significantly reducing tooth damage or poor meshing of the worm wheel portion 30 and the worm portion 40 when they come into contact, reducing machine downtime and improving production efficiency.

[0072] Although not shown in the drawings, the motor device of the present disclosure includes the aforementioned reduction unit 1 and a motor connected to the reduction unit 1 .

[0073] As mentioned above, the reduction unit of the present disclosure and the motor device equipped with the reduction unit can take into account both product performance and production efficiency.

[0074] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure may be combined and / or coupled in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or couplings are intended to fall within the scope of this disclosure.

[0075] The embodiments of the present disclosure are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present disclosure is defined by the appended claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A reduction unit comprising: a gearbox provided with a fixed shaft; and The rotating body has a rotating shaft and a worm gear portion that rotates together with the rotating shaft, wherein the rotating shaft is rotatably mounted on the fixed shaft through a hollow portion formed inside. The gear box accommodates the rotating body and the worm portion serving as the input shaft of the motor. The worm wheel portion is engaged with the worm portion, It is characterized by: The fixed shaft includes a small diameter portion, a first step portion, a middle diameter portion, a second step portion and a large diameter portion in order from the front end. The hollow portion includes a small hole portion, a transition hole portion and a large hole portion in sequence from the front end. An elastically deformable sealing ring is sleeved on the first step portion, and the sealing ring is in contact with the small diameter portion and the small hole portion.

2. The reduction unit according to claim 1, characterized in that: The large hole portion is in contact with the large diameter portion, and the transition hole portion is opposed to the second step portion with a certain gap therebetween.

3. The reduction unit according to claim 1, characterized in that: The small hole portion is in contact with the middle diameter portion.

4. The reduction unit according to claim 1, characterized in that: When the sealing ring is sleeved on the first step portion, the inner diameter of the large hole portion is larger than the outer diameter of the sealing ring.

5. The reduction unit according to claim 1, characterized in that: When the sealing ring is sleeved on the first step portion and is not in contact with the rotating shaft, the inner diameter of the small hole portion is smaller than the outer diameter of the sealing ring.

6. The reduction unit according to claim 1, characterized in that: The first step portion is smoothly connected to the small-diameter portion and the middle-diameter portion.

7. The reduction unit according to claim 1, characterized in that: In a cross section of the reduction unit cut along a plane including the axis of the fixed shaft, the transition hole portion and the second step portion are both linear, and the angles relative to the axis are between 15 and 60 degrees.

8. The reduction unit according to claim 1, characterized in that: An annular flange portion protruding toward the fixed shaft is further provided at the front end of the small hole portion. The annular flange portion, the small hole portion, the small diameter portion and the first step portion define a first space for accommodating the sealing ring. The transition hole portion, the large hole portion, the middle diameter portion and the second step portion define a second space. In a direction along the axis of the fixed shaft, a length of the first space is 1.1-1.2 times a length of the second space.

9. The reduction unit according to claim 1, characterized in that: The worm gear portion is formed as a helical gear.

10. A motor device, characterized in that: The motor device has: The reduction unit according to any one of claims 1 to 9; and The motor is connected to the reduction unit.

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