A cycloid reducer

Abstract

The utility model relates to a cycloid reducer, which includes an eccentric shaft, an output flange, a cycloid gear, a first bearing group and a second bearing group; the eccentric shaft is used to be driven to drive the cycloid gear to rotate, so that the cycloid gear drives the output flange to rotate; the first bearing group and the second bearing group are arranged in sequence along the axial direction of the eccentric shaft to provide radial support for the output flange at different positions along the axial direction of the eccentric shaft. Compared with the method in the prior art that the output flange uses a single bearing group to provide radial support, the utility model uses at least two bearing groups, the first bearing group and the second bearing group, to provide radial support for the output flange. Due to the increase in the number of bearing groups, the bearing capacity of the bearings in each bearing group is relatively small, which can reduce the wear of each bearing and increase the service life of the bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a cycloid reducer. Background Art

[0002] The existing cycloid reducer includes a fixed seat, an eccentric shaft, an output flange and a cycloid gear. The eccentric shaft is used to drive the cycloid gear to rotate. The cycloid gear is used to drive the output flange to rotate through a pin when driven to rotate. The output flange is rotatably arranged on the fixed seat. The cycloid reducer also includes a bearing group, which is used to provide radial support for the output flange.

[0003] The above-mentioned cycloid reducer has at least the following defects: the output flange is supported by a single bearing group, which results in a large load-bearing capacity on each bearing in the bearing group, resulting in faster bearing wear and reduced life, so improvements need to be made to address this situation. Utility Model Content

[0004] In view of this, the utility model provides a cycloid reducer, which mainly solves the technical problem in the prior art that the output flange is supported by a single bearing group, resulting in a large load-bearing capacity on each bearing in the bearing group, thereby causing the bearings to wear faster and their service life to be reduced.

[0005] In order to achieve the above purpose, the utility model mainly provides the following technical solutions:

[0006] The embodiment of the utility model provides a cycloid reducer, comprising an eccentric shaft, an output flange and a cycloid gear, wherein the eccentric shaft is used to be driven to drive the cycloid gear to rotate, so that the cycloid gear drives the output flange to rotate; the cycloid reducer also comprises a first bearing group and a second bearing group;

[0007] The first bearing group and the second bearing group are arranged in sequence along the axial direction of the eccentric shaft to provide radial support for different positions of the output flange along the axial direction of the eccentric shaft.

[0008] In some embodiments, the output flange has a flange segment and a support segment connected along the axial direction of the eccentric shaft, the flange segment is located on one axial side of the cycloid gear, the support segment is located on the other axial side of the cycloid gear, and the output flange outputs power through the flange segment;

[0009] The first bearing group is used to provide radial support for the flange segment, and the second bearing group is used to provide radial support for the support segment.

[0010] In some embodiments, the cycloid reducer has a fixed seat, the fixed seat has an inner hole, and the eccentric shaft is rotatably sleeved in the inner hole;

[0011] Wherein, the flange segment is located between the eccentric shaft and the hole wall of the inner hole, the first bearing group includes a first a bearing and a second a bearing, the first a bearing is sleeved between the eccentric shaft and the flange segment, the second a bearing is sleeved between the flange segment and the hole wall of the inner hole, the first bearing group provides support for the radial inner side of the flange segment through the first a bearing, and the first bearing group provides support for the radial outer side of the flange segment through the second a bearing;

[0012] And / or, the support section is located between the eccentric shaft and the wall of the inner hole, the second bearing group includes a first b bearing and a second b bearing, the first b bearing is sleeved between the eccentric shaft and the support section, the second b bearing is sleeved between the support section and the wall of the inner hole, the second bearing group provides support to the radial inner side of the support section through the first b bearing, and the second bearing group provides support to the radial outer side of the support section through the second b bearing.

[0013] In some embodiments, when the support segment is located between the eccentric shaft and the wall of the inner hole, and the second bearing group includes a first b-bearing, and the second bearing group provides support to the radial inner side of the support segment through the first b-bearing,

[0014] The cycloid reducer further comprises a stator and a rotor, wherein the stator is sleeved on the outside of the fixing seat, and the stator is used to drive the rotor to rotate;

[0015] The rotor has a connecting tube, and the rotor is fixed on the outer side of the eccentric shaft through the connecting tube to drive the eccentric shaft to rotate;

[0016] Wherein, the connecting tube is located between the first b-bearing and the eccentric shaft, and the eccentric shaft provides support for the first b-bearing through the connecting tube.

[0017] In some embodiments, the output flange has a connecting section located between the flange section and the supporting section, and the flange section and the supporting section are connected via the connecting section;

[0018] Wherein, the connecting section passes through the through hole on the cycloid gear and is gap-matched with the through hole.

[0019] In some embodiments, the connecting section is integrally formed on the supporting section, and the flange section is detachably connected to the connecting section.

[0020] In some embodiments, the cycloid gear drives the output flange to rotate via a pin shaft, and the pin shaft passes through a transmission hole on the cycloid gear; one end of the pin shaft is fixed to the flange segment, and the other end is fixed to the support segment.

[0021] By means of the above technical solution, the cycloid reducer of the utility model has at least the following beneficial effects:

[0022] Compared with the prior art method in which the output flange uses a single bearing group to provide radial support, the utility model uses at least two bearing groups, the first bearing group and the second bearing group, to provide radial support for the output flange. Due to the increase in the number of bearing groups, the bearing capacity of each bearing group is smaller, which can reduce the wear of each bearing and increase the service life of the bearing.

[0023] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a partial structural schematic diagram of a cycloid reducer provided by one embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Cross-sectional view of the cycloid reducer;

[0027] Figure 3 yes Figure 1 Schematic diagram of the cycloid reducer with hidden output flange;

[0028] Figure 4 yes Figure 1 Another cross-sectional view of the cycloid reducer.

[0029] Figure numerals: 1, eccentric shaft; 2, output flange; 3, first bearing group; 4, second bearing group; 5, fixed seat; 6, stator; 7, rotor; 8, cycloid gear; 9, needle roller; 10, pin shaft; 21, flange section; 22, connecting section; 23, supporting section; 31, first a-bearing; 32, second a-bearing; 41, first b-bearing; 42, second b-b bearing; 51, end cover; 52, needle roller seat; 71, connecting tube; 501, inner hole; 801, through hole; 802, transmission hole. DETAILED DESCRIPTION

[0030] 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 only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0033] like Figures 1 to 4 As shown, a cycloid reducer proposed in one embodiment of the utility model includes an eccentric shaft 1, an output flange 2 and a cycloid gear 8. The eccentric shaft 1 is used to be driven to drive the cycloid gear 8 to rotate, so that the cycloid gear 8 drives the output flange 2 to rotate. Among them, the cycloid reducer also includes a first bearing group 3 and a second bearing group 4. The first bearing group 3 and the second bearing group 4 are arranged in sequence along the axial direction of the eccentric shaft 1 to provide radial support for different positions of the output flange 2 along the axial direction of the eccentric shaft 1.

[0034] Compared with the prior art method in which the output flange 2 uses a single bearing group to provide radial support, the utility model uses at least two bearing groups, a first bearing group 3 and a second bearing group 4, to provide radial support for the output flange 2. Due to the increase in the number of bearing groups, the bearing capacity of each bearing group is smaller, which can reduce the wear of each bearing and increase the service life of the bearing.

[0035] In some embodiments, Figure 2 As shown, the aforementioned output flange 2 has a flange segment 21 and a support segment 23 connected along the axial direction of the eccentric shaft 1. The flange segment 21 is located on one axial side of the aforementioned cycloid gear 8, and the support segment 23 is located on the other axial side of the aforementioned cycloid gear 8. The output flange 2 outputs power through the flange segment 21. Among them, the first bearing group 3 is used to provide radial support for the flange segment 21, and the second bearing group 4 is used to provide radial support for the support segment 23.

[0036] In the above example, by arranging the flange section 21 and the support section 23 of the output flange 2 on opposite sides of the cycloid gear 8, the space on both sides of the cycloid gear 8 can be effectively utilized, making the structure of the cycloid reducer of the utility model more compact.

[0037] In some embodiments, Figure 2 As shown, the aforementioned cycloid reducer may have a fixed seat 5 , the fixed seat 5 has an inner hole 501 , and the aforementioned eccentric shaft 1 is rotatably sleeved in the inner hole 501 .

[0038] The aforementioned flange segment 21 is located between the eccentric shaft 1 and the hole wall of the inner hole 501. The aforementioned first bearing group 3 includes a first a-bearing 31 and a second a-bearing 32, wherein the first a-bearing 31 is sleeved between the eccentric shaft 1 and the flange segment 21, and the second a-bearing 32 is sleeved between the flange segment 21 and the hole wall of the inner hole 501. The first bearing group 3 provides support for the radial inner side of the flange segment 21 through the first a-bearing 31, and the first bearing group 3 provides support for the radial outer side of the flange segment 21 through the second a-bearing 32.

[0039] In the above example, the first a-bearing 31 and the second a-bearing 32 cooperate with each other to provide stable support for the flange segment 21 .

[0040] It should be noted here that the aforementioned first a-bearing 31 may be a ball bearing, and the second a-bearing 32 may be a sliding bearing.

[0041] In some embodiments, Figure 2As shown, the aforementioned support section 23 can be located between the eccentric shaft 1 and the hole wall of the inner hole 501, and the second bearing group 4 includes a first b-bearing 41 and a second b-bearing 42. The first b-bearing 41 is sleeved between the eccentric shaft 1 and the support section 23, and the second b-bearing 42 is sleeved between the support section 23 and the hole wall of the inner hole 501. The second bearing group 4 provides support to the radial inner side of the support section 23 through the first b-bearing 41, and the second bearing group 4 provides support to the radial outer side of the support section 23 through the second b-bearing 42.

[0042] In the above example, the first b-bearing 41 and the second b-bearing 42 cooperate with each other to provide stable support for the supporting section 23 .

[0043] It should be noted here that the first b-bearing 41 and the second b-bearing 42 mentioned above can both be sliding bearings.

[0044] It should be noted here that: Figure 2 As shown, the inner hole 501 mentioned above can be evenly distributed with a plurality of needle rollers 9 along the circumferential direction, and the needle rollers 9 cooperate to form a gear ring structure, and the cycloid gear 8 mentioned above is sleeved between the eccentric shaft 1 and the gear ring structure, and the cycloid gear 8 meshes with the gear ring structure. Among them, the eccentric shaft 1 drives the cycloid gear 8 to form a small tooth difference reduction motion.

[0045] like Figure 2 As shown, the aforementioned fixing seat 5 can be composed of a plurality of components. In a specific application example, the fixing seat 5 can include a needle roller seat 52 and an end cover 51, and the end cover 51 and the needle roller seat 52 can be detachably connected, for example, the two can be detachably connected by screws, so as to facilitate the disassembly and assembly of the fixing seat 5. The aforementioned inner hole 501 passes through the end cover 51 and the needle roller seat 52 in sequence, and the aforementioned gear ring structure is arranged on the needle roller seat 52.

[0046] In some embodiments, Figure 2 As shown, when the aforementioned support section 23 is located between the eccentric shaft 1 and the hole wall of the inner hole 501, and the second bearing group 4 includes the first b bearing 41, and the second bearing group 4 provides support to the radial inner side of the support section 23 through the first b bearing 41, the aforementioned cycloid reducer also includes a stator 6 and a rotor 7, and the stator 6 is sleeved on the outer side of the fixed seat 5, and the stator 6 is used to drive the rotor 7 to rotate. The rotor 7 has a connecting tube 71, and the rotor 7 is sleeved on the outer side of the eccentric shaft 1 through the connecting tube 71 to drive the eccentric shaft 1 to rotate. Among them, the connecting tube 71 is located between the first b bearing 41 and the eccentric shaft 1, and the eccentric shaft 1 provides support to the first b bearing 41 through the connecting tube 71.

[0047] In the above example, the rotor 7 is an external structure, the stator 6 drives the rotor 7 to rotate, and the rotor 7 drives the eccentric shaft 1 to rotate together through the connecting tube 71. Among them, through the connection tube 71, on the one hand, the rotor 7 can drive the eccentric shaft 1 to rotate through the connecting tube 71, and on the other hand, the eccentric shaft 1 can indirectly provide support to the first b bearing 41 through the connecting tube 71.

[0048] In some embodiments, Figure 2 As shown, the output flange 2 has a connecting section 22 located between the flange section 21 and the supporting section 23, and the flange section 21 and the supporting section 23 are connected through the connecting section 22. The connecting section 22 passes through the through hole 801 on the cycloid gear 8 and is loosely matched with the through hole 801.

[0049] In the above example, the flange section 21 and the support section 23 distributed on both sides of the cycloid gear 8 can be effectively connected by setting the connecting section 22; and because the connecting section 22 passes through the through hole 801 on the cycloid gear 8, the space can be effectively utilized, making the structure of the cycloid reducer more compact.

[0050] In some embodiments, Figure 2 As shown, the aforementioned connecting section 22 can be integrally formed on the supporting section 23, and the aforementioned flange section 21 and the connecting section 22 can be detachably connected, for example, the two can be detachably connected by screws.

[0051] In the above example, since the flange section 21 and the connecting section 22 are both detachable, it is convenient to pass the connecting section 22 through the cycloid gear 8 and then connect it to the flange, which is beneficial to the assembly of the cycloid reducer.

[0052] In some embodiments, Figure 4 As shown, the aforementioned cycloid gear 8 drives the output flange 2 to rotate through the pin 10. The pin 10 passes through the transmission hole 802 on the cycloid gear 8. When the cycloid gear 8 rotates, the pin 10 is driven to move through the transmission hole 802, so that the pin 10 drives the output flange 2 to rotate. Among them, one end of the pin 10 is fixed to the flange segment 21, and the other end is fixed to the support segment 23.

[0053] In the above example, one end of the pin 10 can be plugged and fixed to the flange section 21, and the other end of the pin 10 can be plugged and fixed to the support section 23. The pin 10 can improve the connection stability between the flange section 21 and the support section 23.

[0054] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A cycloid reducer, comprising an eccentric shaft (1), an output flange (2) and a cycloid gear (8), wherein the eccentric shaft (1) is used to be driven to drive the cycloid gear (8) to rotate, so that the cycloid gear (8) drives the output flange (2) to rotate; characterized in that: The cycloid reducer further comprises a first bearing group (3) and a second bearing group (4); The first bearing group (3) and the second bearing group (4) are arranged in sequence along the axial direction of the eccentric shaft (1) to provide radial support for different positions of the output flange (2) along the axial direction of the eccentric shaft (1).

2. The cycloid reducer according to claim 1, characterized in that: The output flange (2) has a flange section (21) and a support section (23) connected to each other along the axial direction of the eccentric shaft (1); the flange section (21) is located on one axial side of the cycloid gear (8); the support section (23) is located on the other axial side of the cycloid gear (8); and the output flange (2) outputs power through the flange section (21); The first bearing group (3) is used to provide radial support for the flange segment (21), and the second bearing group (4) is used to provide radial support for the support segment (23).

3. The cycloid reducer according to claim 2, characterized in that: The cycloid reducer has a fixed seat (5), the fixed seat (5) has an inner hole (501), and the eccentric shaft (1) is rotatably sleeved in the inner hole (501); The flange segment (21) is located between the eccentric shaft (1) and the hole wall of the inner hole (501); the first bearing group (3) comprises a first a-bearing (31) and a second a-bearing (32); the first a-bearing (31) is sleeved between the eccentric shaft (1) and the flange segment (21); the second a-bearing (32) is sleeved between the flange segment (21) and the hole wall of the inner hole (501); the first bearing group (3) provides support for the radial inner side of the flange segment (21) through the first a-bearing (31); and the first bearing group (3) provides support for the radial outer side of the flange segment (21) through the second a-bearing (32); And / or, the support section (23) is located between the eccentric shaft (1) and the hole wall of the inner hole (501), the second bearing group (4) includes a first b-bearing (41) and a second b-bearing (42), the first b-bearing (41) is sleeved between the eccentric shaft (1) and the support section (23), the second b-bearing (42) is sleeved between the support section (23) and the hole wall of the inner hole (501), the second bearing group (4) provides support to the radial inner side of the support section (23) through the first b-bearing (41), and the second bearing group (4) provides support to the radial outer side of the support section (23) through the second b-bearing (42).

4. The cycloid reducer according to claim 3, characterized in that: When the support section (23) is located between the eccentric shaft (1) and the wall of the inner hole, and the second bearing group (4) includes a first b-bearing (41), the second bearing group (4) provides support to the radial inner side of the support section (23) through the first b-bearing (41), The cycloid reducer further comprises a stator (6) and a rotor (7), wherein the stator (6) is sleeved on the outer side of the fixing seat (5), and the stator (6) is used to drive the rotor (7) to rotate; The rotor (7) has a connecting tube (71), and the rotor (7) is sleeved on the outer side of the eccentric shaft (1) through the connecting tube (71) to drive the eccentric shaft (1) to rotate; The connecting tube (71) is located between the first b-bearing (41) and the eccentric shaft (1), and the eccentric shaft (1) provides support for the first b-bearing (41) through the connecting tube (71).

5. The cycloid reducer according to any one of claims 2 to 4, characterized in that: The output flange (2) has a connecting section (22) located between the flange section (21) and the supporting section (23), and the flange section (21) and the supporting section (23) are connected via the connecting section (22); Wherein, the connecting section (22) passes through the through hole (801) on the cycloid gear (8) and is clearance-matched with the through hole (801).

6. The cycloid reducer according to claim 5, characterized in that: The connecting section (22) is integrally formed on the supporting section (23), and the flange section (21) is detachably connected to the connecting section (22).

7. The cycloid reducer according to any one of claims 2 to 4 and 6, characterized in that: The cycloid gear (8) drives the output flange (2) to rotate via a pin shaft (10), and the pin shaft (10) passes through a transmission hole (802) on the cycloid gear (8); one end of the pin shaft is fixed to the flange segment (21), and the other end is fixed to the support segment (23).

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