Harmonic speed reducer capable of preventing oil spilling

Abstract

The invention relates to a harmonic speed reducer capable of preventing oil spilling, which comprises a wave generator, a flexible gear, a rigid gear and a bearing, a labyrinth flow channel is formed between an inner ring body and an outer ring body of the bearing, and the labyrinth flow channel is communicated with the meshing position of the flexible gear and the rigid gear. The labyrinth flow channel is provided with a first flow channel section connected with the rolling groove, a second flow channel section which is connected with the first flow channel section and is bent at an angle with the first flow channel section, and a third flow channel section which is connected with the second flow channel section and is bent at an angle with the second flow channel section, and the third flow channel section is bent; therefore, the lubricating grease between the inner ring body and the outer ring body is prevented from flowing out and being mixed with the lubricating grease at the meshing position of the flexible gear and the rigid gear.

Description

Technical Field

[0001] The invention relates to a harmonic reducer, in particular to a harmonic reducer capable of preventing oil overflow. Background Art

[0002] A harmonic reducer is a reduction gear structure that uses a wave generator to make the flexible gear produce controllable elastic deformation and mesh with the rigid gear to transmit force.

[0003] Referring to the "top hat type harmonic gear device" provided in Taiwan Application No. 107104961, the bearing seal can block the gap between the gear side gap and the second gap on the bearing side, thereby preventing or inhibiting excess lubricant from flowing into the bearing. In addition, the excess lubricant that has flowed into the bearing can also flow back to the gap on the gear side through the bearing seal. Therefore, the oil seal can prevent or inhibit the excess lubricant that has flowed into the bearing from leaking out. However, the bearing seal can only inhibit the flow of grease in one direction, that is, it can only prevent the grease on the gear side from flowing into the bearing part, but cannot prevent the grease on the bearing part from flowing into the gear side. Therefore, it will cause oil mixing or the grease on the bearing part to flow out, resulting in insufficient lubrication of the bearing part.

[0004] Referring to the "flexible meshing gear system" provided in Japanese application No. 2018012540, in order to prevent the grease on the gear side from flowing into the bearing part, many components must be structurally changed, such as processing the second internal gear component and the main bearing as one piece, and controlling the bearing track accuracy and gear accuracy at the same time, so it is difficult to manufacture in production. Summary of the invention

[0005] The object of the present invention is to provide a harmonic reducer which can prevent oil overflow and avoid the occurrence of oil mixing.

[0006] Another object of the present invention is to provide a harmonic reducer that prevents oil spillage, thereby reducing manufacturing costs.

[0007] To achieve the aforementioned purpose, the present invention provides a harmonic reducer for preventing oil overflow, comprising: a wave generator; a flexible gear, sleeved on the wave generator and having an outer tooth portion; a rigid gear, rotatably meshed with the flexible gear and having an inner tooth portion meshed with the outer tooth portion; and a bearing, disposed between the flexible gear and the rigid gear, and comprising an inner ring body, an outer ring body, and a plurality of rolling elements; the inner ring body having an inner rolling groove; the outer ring body having an outer rolling groove forming a rolling groove with the inner rolling groove, a labyrinth flow channel being formed between the outer ring body and the inner ring body, the labyrinth flow channel having a first flow channel section connected to the rolling groove, a second flow channel section connected to the first flow channel section and bent at an angle to the first flow channel section, and a third flow channel section connected to the second flow channel section and bent at an angle to the second flow channel section, and the third flow channel section is bent; a plurality of the rolling elements are disposed in the rolling groove.

[0008] The effect of the present invention lies in: since a labyrinth flow channel is formed between the inner ring body and the outer ring body of the bearing, the labyrinth flow channel connects the meshing point of the flexible gear and the rigid gear, thereby preventing the lubricating grease between the inner ring body and the outer ring body from flowing out and mixing with the lubricating grease at the meshing point of the flexible gear and the rigid gear; in addition, the present invention only needs to change the structure of the inner ring body and the outer ring body of the bearing to achieve the effect of preventing oil overflow, therefore, the number of parts to be changed in design and production is small, thereby effectively reducing the production cost.

[0009] Preferably, the inner ring of the bearing is fixedly mounted on the rigid gear, and the outer ring of the bearing is fixedly mounted on the flexible gear. Alternatively, the inner ring of the bearing is fixedly mounted on the flexible gear, and the outer ring of the bearing is fixedly mounted on the rigid gear.

[0010] Preferably, the inner ring body of the bearing further comprises a first inner portion located on one side of the inner rolling groove, and a second inner portion located on the other side of the inner rolling groove, and the outer ring body of the bearing further comprises a first outer portion located on one side of the outer rolling groove and forming an outer flow channel with the first inner portion, and a second outer portion located on the other side of the outer rolling groove and forming the labyrinth flow channel with the second inner portion.

[0011] Preferably, the second inner portion of the inner ring body is recessed with a flow channel recess, the second outer portion of the outer ring body extends between the second inner portion and the flexible gear, and has a flow channel protrusion located in the flow channel recess, and a gap is provided between the flow channel protrusion and the flow channel recess to form the third flow channel section.

[0012] Preferably, the flexible gear has a first ring portion, which has a ring body portion parallel to the axis and for each of the outer teeth to be arranged, an extension portion connected to the ring body portion and perpendicular to the axis, and a flange portion connected to the extension portion. The second outer portion of the outer ring body extends between the second inner portion and the extension portion and has an inclined surface toward the extension portion, and the angle between the inclined surface and the extension portion is 5-10 degrees.

[0013] Preferably, the second outer portion is integrally formed with or detachably disposed on the outer ring body.

[0014] Preferably, the top surface of the flow channel convex portion of the outer ring body is planar, inwardly concave arc-shaped, serrated, or outwardly convex arc-shaped toward the flow channel concave portion of the inner ring body.

[0015] Preferably, the top surface of the concave portion of the flow channel of the inner ring body facing the convex portion of the flow channel of the outer ring body is planar or serrated.

[0016] Preferably, the present invention further comprises an oil retaining member, which is made of a porous material and is disposed at the concave portion or the convex portion of the flow channel.

[0017] Preferably, the oil retaining member has a first oil retaining portion disposed in the flow channel recess, and a second oil retaining portion connected to the first oil retaining portion and located in the second flow channel section.

[0018] Preferably, the second outer portion of the outer ring body is recessed with a flow channel recess, the second inner portion of the inner ring body extends between the second outer portion and the flexible gear, and has a flow channel protrusion located in the flow channel recess, and a gap is provided between the flow channel protrusion and the flow channel recess to form the third flow channel section.

[0019] Preferably, the second inner portion is integrally formed with or detachably disposed on the inner ring body.

[0020] Preferably, the top surface of the flow channel convex portion of the inner ring body is planar, inwardly concave arc-shaped, serrated, or outwardly convex arc-shaped toward the flow channel concave portion of the outer ring body.

[0021] Preferably, the top surface of the flow channel concave portion of the outer ring body facing the flow channel convex portion of the inner ring body is planar or serrated.

[0022] Preferably, there is also an oil retaining member, which is made of a porous material and is arranged at the concave portion of the flow channel or the convex portion of the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a three-dimensional composite diagram of a first embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Section view of line segment 2-2;

[0026] Figure 3A is a partial enlarged view of the first embodiment of the present invention;

[0027] Figure 3B yes Figure 3A A partial enlarged view of

[0028] Figure 4 is a partial enlarged view of the second embodiment of the present invention;

[0029] Figure 5 is a partial enlarged view of the third embodiment of the present invention;

[0030] Figure 6 is a partial enlarged view of a fourth embodiment of the present invention;

[0031] Figure 7 is a partial enlarged view of a fifth embodiment of the present invention;

[0032] Figure 8 is a partial enlarged view of a sixth embodiment of the present invention;

[0033] Fig. 9 is a partial enlarged view of the seventh embodiment of the present invention;

[0034] Fig.10 is a partial enlarged view of an eighth embodiment of the present invention;

[0035] Fig.11A is a partial enlarged view of a ninth embodiment of the present invention;

[0036] Fig. 11B is a partial enlarged view of the tenth embodiment of the present invention;

[0037] Fig.12 is a cross-sectional view of an eleventh embodiment of the present invention;

[0038] Fig.13 is a cross-sectional view of a twelfth embodiment of the present invention;

[0039] Fig.14Ais a partial enlarged view of another implementation state of the first embodiment of the present invention, showing a state where the second outer portion is locked on the outer ring body by using screws; and

[0040] Fig. 14B It is a partial enlarged view of another implementation state of the first embodiment of the present invention, showing a state where the second outer portion is locked on the outer ring body after a screw is passed through the flexible gear.

[0041] Among them, 10…wave generator; L…axis; 11…elliptical shaft member; 12…flexible bearing; 121…flexible inner ring member; 122…flexible outer ring member; 123…rolling member; 20, 20A…flexible gear; 21…first ring portion; 211…ring body portion; 212…extension portion; 213, 213A…flange portion; 22…external tooth portion; 30, 30A…rigid gear; 31, 31A…second ring portion; 32…internal tooth portion; A…bearing; B…angle; 40, 40A…inner ring body; 41…inner rolling groove; 42…first inner side portion; 43, 43A…second inner side portion; 431…flow channel recess; 432… Flow channel protrusion; 50, 50A, 50B, 50C…outer ring body; 51…outer rolling groove; 52…first outer side; 53, 53A, 53B, 53C…second outer side; 531, 531A, 531B, 531C…flow channel protrusion; 532…flow channel concave; 533…inclined surface; 54…screw; 60…rolling element; 91…rolling groove; 92…outer flow channel; 93…labyrinth flow channel; 931…first flow channel section; 932…second flow channel section; 933…third flow channel section; 94, 95, 96, 97…oil retaining member; 951…first oil retaining portion; 952…second oil retaining portion; 99…oil stop ring seal. DETAILED DESCRIPTION

[0042] See also Figures 1 to 3B As shown, the first embodiment of the present invention provides a harmonic reducer for preventing oil overflow, which mainly includes a wave generator 10, a flexible gear 20, a rigid gear 30, and a bearing A, wherein:

[0043] The wave generator 10 includes an elliptical shaft 11 that can rotate around an axis L, and a flexible bearing 12 fixed to the elliptical shaft 11 and can be linked to the elliptical shaft 11; in this embodiment, the flexible bearing 12 has a flexible inner ring 121 fixed to the elliptical shaft 11, a flexible outer ring 122 relative to the flexible inner ring 121, and a plurality of rolling members 123 arranged between the flexible inner ring 121 and the flexible outer ring 122.

[0044] The flexible gear 20 is sleeved on the flexible bearing 12, and has a first ring portion 21 partially sleeved on the flexible outer ring member 122, and a plurality of outer teeth 22 arranged around the axis L and spaced apart on the outside of the first ring portion 21. The elliptical shaft member 11 of the wave generator 10 can be driven by a driving source (e.g., a motor) to drive the flexible bearing 12 and the flexible gear 20 to rotate; in this embodiment, the flexible gear 20 is hollow, so that the first ring portion 21 has a ring body portion 211 parallel to the axis L and for each of the outer teeth 22 to be arranged, an extension portion 212 connected to the ring body portion 21 and perpendicular to the axis L, and a flange portion 213 connected to the extension portion 212.

[0045] The rigid gear 30 is sleeved on the flexible gear 20 and has a second ring portion 31 and a plurality of inner teeth 32 spaced around the axis L and disposed inside the second ring portion 31 . Each inner tooth 32 is only partially meshed with each outer tooth 22 .

[0046] The bearing A is disposed between the flexible gear 20 and the rigid gear 30 , and includes an inner ring 40 , an outer ring 50 , and a plurality of rolling elements 60 .

[0047] The inner ring body 40 is fixed to the second ring portion 31 of the rigid gear 30 and has an inner rolling groove 41 , a first inner side portion 42 located at one side of the inner rolling groove 41 , and a second inner side portion 43 located at the other side of the inner rolling groove 41 .

[0048] The outer ring body 50 is fixedly mounted on the flange portion 213 of the flexible gear 20, and has an outer rolling groove 51 that forms a rolling groove 91 with the inner rolling groove 41, a first outer portion 52 that is located on one side of the outer rolling groove 51 and forms an outer flow channel 92 with the first inner portion 42, and a second outer portion 53 that is located on the other side of the outer rolling groove 51 and forms a labyrinth flow channel 93 with the second inner portion 43; in this embodiment, the second outer portion 53 is integrally formed with the outer ring body 50, but is not limited thereto, and the second outer portion 53 can also be detachably mounted on the outer ring body 50, and the disassembly method can be referred to in Fig.14A As shown, the second outer portion 53 is fixed to the outer ring body 50 by screws 54, or refer to Fig. 14BAs shown, the second outer portion 53 is clamped in place by the flexible gear 20 and the outer ring body 50, and the second outer portion 53 is locked on the outer ring body 50 by passing a screw 54 through the flexible gear 20. It is worth mentioning that the second outer portion 53 can also be fixed to the outer ring body 50 by snapping, bonding or other means; wherein the outer flow channel 92 is connected to the rolling groove 91, and an oil stop ring seal 99 is used to set the outlet of the outer flow channel 92, the labyrinth flow channel 93 is connected to the rolling groove 91, and the labyrinth flow channel 93 is connected to the meshing point of the flexible gear 20 and the rigid gear 30.

[0049] In the present embodiment, the labyrinth-like flow channel 93 has a first flow channel section 931 connected to the rolling groove 91, a second flow channel section 932 connected to the first flow channel section 931 and bent at an angle to the first flow channel section 931, and a third flow channel section 933 connected to the second flow channel section 932 and bent at an angle to the second flow channel section 932. The third flow channel section 933 also presents a plurality of bends. The labyrinth-like flow channel 93 presents a labyrinth-like structure with a plurality of bends through the mutually bent first flow channel section 931, the second flow channel section 932, and the third flow channel section 933. The second inner portion 43 of the inner ring body 40 is farther away from the extension portion 212 of the flexible gear 20 than the second outer portion 53 of the outer ring body 50, and the second inner portion 43 of the inner ring body 40 is provided with a flow channel recess 431 facing the extension portion 212 of the flexible gear 20, the second outer portion 53 of the outer ring body 50 extends between the second inner portion 43 and the extension portion 212, and has a flow channel protrusion 531 located in the flow channel recess 431, and there is a gap between the flow channel protrusion 531 and the flow channel recess 431 to form a multi-bend third flow channel section 933, and the top surface of the flow channel protrusion 531 of the outer ring body 50 is flat.

[0050] The plurality of rolling elements 60 are disposed in a rolling groove 91 formed between the inner ring body 40 and the outer ring body 50 .

[0051] The above is the configuration description of each major component of the first embodiment of the present invention. The effect of the present invention is described as follows.

[0052] First, avoid oil mixing.

[0053] Since an outer flow channel 92 and a labyrinth flow channel 93 are formed between the inner ring body 40 and the outer ring body 50 of the bearing A, wherein the labyrinth flow channel 93 connects the meshing point of the flexible gear 20 and the rigid gear 30, and the present invention particularly adopts a labyrinth structure design for the labyrinth flow channel 93, that is, the first flow channel section 931, the second flow channel section 932, and the third flow channel section 933 are bent to each other, so that the labyrinth flow channel 93 presents a flow channel structure with multiple bending types. In particular, in the third flow channel section 933, the structural design of the flow channel recess 431 and the flow channel protrusion 531 is utilized to form a cut-off gap and an expansion cavity therebetween. When the lubricating grease sealed in the bearing A passes through the gap of the tortuous labyrinth, a throttling effect is generated to achieve the purpose of preventing leakage. Therefore, the present invention can prevent the lubricating grease between the inner ring body 40 and the outer ring body 50 from flowing out and mixing with the lubricating grease at the meshing point of the flexible gear 20 and the rigid gear 30.

[0054] Second, reduce production costs.

[0055] The present invention can achieve the effect of preventing oil spillage by only changing the structures of the inner ring body 40 and the outer ring body 50 of the bearing A. Therefore, the number of parts to be changed in design and manufacturing is small, thereby effectively reducing the manufacturing cost.

[0056] It is worth mentioning that the second outer portion 53 of the outer ring body 50 extends between the second inner portion 43 of the inner ring body 40 and the extension portion 212 of the flexible gear 20, and has a slope 533 facing the extension portion 212, and the angle B between the slope 533 and the extension portion 212 is 5-10 degrees. In this way, when the flexible gear 20 is driven to deform and actuate, it is avoided that the position of the second outer portion 53 of the outer ring body 50 is affected, and the second outer portion 53 of the outer ring body 50 and the second inner portion 43 of the inner ring body 40 interfere with each other, thereby affecting the smoothness of the movement of the outer ring body 50 and the inner ring body 40.

[0057] See also Figure 4 As shown, the second embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0058] The top surface of the flow channel protrusion 531A of the second outer portion 53A of the outer ring body 50A is serrated toward the flow channel recess 431 of the inner ring body 40, so that the third flow channel section 933 of the labyrinth flow channel 93 presents more bends, interception gaps and expansion cavities, so that the structural design of the labyrinth flow channel 93 can better prevent the lubricating grease between the inner ring body 40 and the outer ring body 50A from flowing out.

[0059] See also Figure 5 As shown, the third embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0060] The flow channel recess 431A of the second inner side portion 43A of the inner ring body 40A is serrated toward the flow channel protrusion 531 of the outer ring body 50, but the present invention is not limited thereto. The flow channel recess of the inner ring body 40A may also be in an inwardly concave arc shape or an outwardly convex arc shape, so that the third flow channel section 933 of the labyrinth flow channel 93 presents more bends, interception gaps and expansion cavities, so that the structural design of the labyrinth flow channel 93 can better prevent the lubricating grease between the inner ring body 40A and the outer ring body 50 from flowing out.

[0061] See also Figure 6 As shown, the fourth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0062] The top surface of the flow channel convex portion 531B of the second outer portion 53B of the outer ring body 50B is in an inwardly concave arc shape toward the flow channel concave portion 431 of the inner ring body 40, so that the third flow channel section 933 of the labyrinth flow channel 93 presents more bends, interception gaps and expansion cavities, so that the structural design of the labyrinth flow channel 93 can better prevent the lubricating grease between the inner ring body 40 and the outer ring body 50B from flowing out.

[0063] See also Figure 7 As shown, the fifth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0064] The top surface of the flow channel convex portion 531C of the second outer portion 53C of the outer ring body 50C is convexly arced outward toward the flow channel concave portion 431 of the inner ring body 40, so that the third flow channel section 933 of the labyrinth flow channel 93 presents more bends, interception gaps and expansion cavities, so that the structural design of the labyrinth flow channel 93 can better prevent the lubricating grease between the inner ring body 40 and the outer ring body 50C from flowing out.

[0065] See also Figure 8 As shown, the sixth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0066] The harmonic reducer for preventing oil overflow also has an oil retaining member 94, which is made of a porous material and is disposed in the concave flow channel portion 431 of the inner ring body 40, and a gap of 0.2 mm to 1.5 mm is provided between the oil retaining member 94 and the convex flow channel portion 531 of the outer ring body 50. In addition, the oil retaining member 94 is made of felt, but is not limited thereto, and can be made of sponge or composite material, etc. By providing the oil retaining member 94, the third flow channel section 933 of the labyrinth flow channel 93 can have a better oil retaining effect, and can prevent the lubricating grease between the inner ring body 40 and the outer ring body 50 from flowing out.

[0067] See also Fig. 9As shown, the seventh embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0068] The harmonic reducer for preventing oil overflow also has an oil retaining member 95, which is made of a porous material and is arranged in the labyrinth flow channel 93, and has a first oil retaining portion 951 arranged in the flow channel recess 431 of the inner ring body 40 and located in the third flow channel section 933, and a second oil retaining portion 952 connected to the first oil retaining portion 951 and located in the second flow channel section 932, and the oil retaining member 95 has a gap with the second outer side portion 53 of the outer ring body 50 and the flow channel protrusion 531. In addition, the oil retaining member 95 is felt, but not limited to this, and can be a sponge or a composite material, etc. Through the arrangement of the oil retaining member 95, the second flow channel section 932 and the third flow channel section 933 of the labyrinth flow channel 93 can have a better oil retaining effect, and the lubricating grease between the inner ring body 40 and the outer ring body 50 can be prevented from flowing out.

[0069] See also Fig.10 As shown, the eighth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0070] The harmonic reducer for preventing oil overflow also has an oil retaining member 96, which is made of a porous material and is disposed on the flow channel convex portion 531 of the outer ring body 50, and a gap of 0.2 mm to 1.5 mm is provided between the oil retaining member 96 and the flow channel concave portion 431 of the inner ring body 40. In addition, the oil retaining member 96 is made of felt, but is not limited thereto, and can be made of sponge or composite material, etc. By providing the oil retaining member 96, the third flow channel section 933 of the labyrinth flow channel 93 can have a better oil retaining effect, and the lubricating grease between the inner ring body 40 and the outer ring body 50 can be prevented from flowing out.

[0071] See also Fig.11A As shown, the ninth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0072] The second outer side portion 53 of the outer ring body 50 is provided with a concave flow channel portion 532, and the second inner side portion 43 of the inner ring body 40 extends between the second outer side portion 53 and the flange portion 213 of the flexible gear 20, and has a convex flow channel portion 432 located in the concave flow channel portion 532, and there is a gap between the convex flow channel portion 432 and the concave flow channel portion 532 to form a bent third flow channel section 933, so that the labyrinth flow channel 93 presents a labyrinth structure with multiple bending patterns, thereby preventing the lubricating grease between the inner ring body 40 and the outer ring body 50 from flowing out and mixing with the lubricating grease at the meshing position of the flexible gear and the rigid gear. In this embodiment, the second inner side portion 43 is integrally formed with the inner ring body 40, but it is not limited thereto. The second inner side portion 43 can also be detachably provided on the inner ring body 40 by screwing, snapping, bonding or other means. Since other structural changes and functions are the same as those of the second to fifth embodiments described above, they will not be described in detail.

[0073] See also Fig. 11B As shown, the tenth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the ninth embodiment in that:

[0074] The harmonic reducer for preventing oil overflow also has an oil retaining member 97, which is made of a porous material and is arranged in the flow channel recess 532, and there is a gap of 0.2mm to 1.5mm between the oil retaining member 97 and the flow channel protrusion 432 of the inner ring body 40. By setting the oil retaining member 97, the third flow channel section 933 of the labyrinth flow channel 93 can have a better oil retaining effect, and can better prevent the lubricating grease between the inner ring body 40 and the outer ring body 50 from flowing out. Since other structural changes and functions are the same as those of the sixth to eighth embodiments above, they are not repeated here.

[0075] See also Fig.12 As shown, the eleventh embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the first embodiment in that:

[0076] On the basis that the inner ring body 40 is provided with a flow channel recess 431 and the outer ring body 50 is provided with a flow channel protrusion 531 located in the flow channel recess 431, the bearing A is arranged between the cup-shaped flexible gear 20A and the rigid gear 30A, especially the inner ring body 40 is fixed to the flange portion 213A of the flexible gear 20A, and the outer ring body 50 is fixed to the second ring portion 31A of the rigid gear 30A, so as to achieve another implementation state.

[0077] See also Fig.13 As shown, the twelfth embodiment of the present invention provides a harmonic reducer for preventing oil spillage, which is different from the ninth embodiment in that:

[0078] On the basis that the outer ring body 50 is provided with a flow channel recess 532 and the inner ring body 40 is provided with a flow channel protrusion 432 located in the flow channel recess 532, the bearing A is arranged between the cup-shaped flexible gear 20A and the rigid gear 30A, especially the inner ring body 40 is fixed to the flange portion 213A of the flexible gear 20A, and the outer ring body 50 is fixed to the second ring portion 31A of the rigid gear 30A, so as to achieve another implementation state.

Claims

1. A harmonic reducer for preventing oil spillage, characterized in that: Include: A wave generator; a flexible gear, sleeved on the wave generator and having an external tooth portion; a rigid gear rotatably meshed with the flexible gear and having an inner tooth portion meshed with the outer tooth portion; and A bearing is arranged between the flexible gear and the rigid gear, and includes an inner ring body, an outer ring body, and a plurality of rolling elements; the inner ring body has an inner rolling groove; the outer ring body has an outer rolling groove that forms a rolling groove with the inner rolling groove, and a labyrinth flow channel is formed between the outer ring body and the inner ring body, the labyrinth flow channel has a first flow channel section connected to the rolling groove, a second flow channel section connected to the first flow channel section and bent at an angle to the first flow channel section, and a third flow channel section connected to the second flow channel section and bent at an angle to the second flow channel section, and the third flow channel section is bent; a plurality of the rolling elements are arranged in the rolling groove.

2. The harmonic reducer for preventing oil spillage according to claim 1, characterized in that: The inner ring body of the bearing further comprises a first inner side portion located on one side of the inner rolling groove, and a second inner side portion located on the other side of the inner rolling groove. The outer ring body of the bearing further comprises a first outer side portion located on one side of the outer rolling groove and forming an outer flow channel with the first inner side portion, and a second outer side portion located on the other side of the outer rolling groove and forming the labyrinth flow channel with the second inner side portion.

3. The harmonic reducer for preventing oil spillage according to claim 2, characterized in that: The second inner side portion of the inner ring body is recessed with a flow channel recess, the second outer side portion of the outer ring body extends between the second inner side portion and the flexible gear, and has a flow channel protrusion located in the flow channel recess, and a gap is provided between the flow channel protrusion and the flow channel recess to form the third flow channel section.

4. The harmonic reducer for preventing oil spillage according to claim 3, characterized in that: The flexible gear has a first ring portion, which has a ring body portion parallel to the axis and on which each of the outer teeth is arranged, an extension portion connected to the ring body portion and perpendicular to the axis, and a flange portion connected to the extension portion. The second outer portion of the outer ring body extends between the second inner portion and the extension portion, and has an inclined surface facing the extension portion, and the angle between the inclined surface and the extension portion is 5-10 degrees.

5. The harmonic reducer for preventing oil spillage according to claim 2, characterized in that: The second outer portion of the outer ring body is recessed with a flow channel recess, the second inner portion of the inner ring body extends between the second outer portion and the flexible gear, and has a flow channel convex portion located in the flow channel recess, and a gap is provided between the flow channel convex portion and the flow channel recess to form the third flow channel section.

6. The harmonic reducer for preventing oil spillage according to claim 3 or 4, characterized in that: The second outer portion is integrally formed or detachably arranged on the outer ring body.

7. The harmonic reducer for preventing oil spillage according to claim 5, characterized in that: The second inner portion is integrally formed or detachably arranged on the inner ring body.

8. The harmonic reducer for preventing oil spillage according to claim 3, characterized in that: The top surface of the flow channel convex portion of the outer ring body is planar, inwardly concave arc-shaped, sawtooth-shaped, or outwardly convex arc-shaped toward the flow channel concave portion of the inner ring body.

9. The harmonic reducer for preventing oil spillage according to claim 3, characterized in that: The top surface of the concave portion of the flow channel of the inner ring body facing the convex portion of the flow channel of the outer ring body is flat or sawtooth-shaped.

10. The harmonic reducer for preventing oil spillage according to claim 3, characterized in that: The invention also comprises an oil retaining part which is made of a porous material and is arranged at the concave part of the flow channel or the convex part of the flow channel.

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