Speed reducer with housing
By designing a structure with a housing in the reducer and using axial holes divided into two parts to realize the conveying of grease, the existing reducer has solved the shortcomings in oil sealing and efficiency, and achieved a balance between high oil sealing and high efficiency.
Patent Information
- Application Number
- CN202311769599.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-06-20
AI Technical Summary
The existing reducers have shortcomings in oil sealing and efficiency, making it difficult to achieve both high oil sealing and high efficiency.
By designing a reducer with a housing, axial holes divided into two parts are used to achieve grease delivery, combining the sealing cover and bearing cover design to ensure stable coupling and sealing of the grease supply line.
A reducer with high oil sealing and high efficiency is achieved. Through the effective conveying and sealing design of grease, the full utilization of grease and the improvement of sealing effect is ensured.
Smart Images
Figure CN120175825A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a speed reducer having a housing. Background Art
[0002] As is well known, the output shaft of a speed reducer is rotatably supported by means of bearings. Summary of the Invention
[0003] Therefore, the object of the present invention is to improve a speed reducer having high oil tightness and high efficiency.
[0004] According to the present invention, this object is achieved by a speed reducer according to the features given in claim 1.
[0005] For the speed reducer, an important feature of the present invention is that the speed reducer is provided with a housing,
[0006] wherein the housing has a through bearing hole in which a bearing is received, and the bearing rotatably supports the output shaft of the speed reducer,
[0007] wherein the annular bearing cover of the speed reducer has an axially protruding first flange region that extends into the bearing hole and in particular abuts against the hole wall of the bearing hole,
[0008] wherein the annular seal cover of the speed reducer has an axially protruding second flange region that extends into the ring opening of the bearing cover and in particular abuts against the inner wall of the ring opening,
[0009] wherein the seal cover has a first annular groove on the side remote from the bearing cover, and a first radial hole of the seal cover leads to the first annular groove,
[0010] wherein a second radial hole of the bearing cover is connected to the first radial hole of the seal cover through a two-part axial hole,
[0011] wherein a first section of the axial hole is arranged in the bearing cover, and a second section of the axial hole is arranged in the seal cover, in particular, wherein the first section is aligned with the second section.
[0012] The advantage here is that grease delivery is achieved through the axially divided hole, i.e., through two different components, specifically the seal cover and the bearing cover. In this way, a grease supply line with a large cross-section can be connected. Here, the bearing cover is stably connected to the housing, so that the connection of the grease supply line does not cause any significant load.
[0013] For this purpose, the bearing cover is implemented to have not only a greater wall thickness than the seal cover, but also a greater outer diameter than the seal cover, so that the grease supply line is arranged to be more accessible, especially during connection.
[0014] In an advantageous design, a shaft seal ring is received at the second flange region, and the shaft seal ring seals relative to the output shaft or relative to a spacer sleeve pushed onto the output shaft.
[0015] In particular, the sealing lip of the shaft seal ring contacts the output shaft, and a sealing seat is formed at the second flange region, and the shaft seal ring is sleeved onto the sealing seat.
[0016] In particular, the spacer sleeve is axially arranged between the inner ring of the bearing sleeved onto the output shaft and the bearing nut screwed onto the output shaft. The advantage here is that the speed reducer can be at least partially filled with oil, and thus oil leakage is prevented.
[0017] In an advantageous design, the first radial hole of the sealing cover is closed relative to the environment by a screw plug. The advantage here is that the first radial hole serves as a grease reservoir.
[0018] In an advantageous design, the first radial hole of the sealing cover has a larger inner diameter than the axial hole. The advantage here is that the first radial hole serves as a grease storage in addition to the first annular groove and the axial hole.
[0019] In an advantageous design, a grease supply line is connected to the second radial hole of the bearing cover. The advantage here is that grease can be delivered from the outside.
[0020] In an advantageous design, the sealing cover is fixed to the bearing cover by a threaded part, and the threaded part is screwed into the axially directed threaded hole of the bearing cover.
[0021] Wherein, both the threaded part and / or the threaded hole are arranged at the same radial distance from the rotational axis of the output shaft.
[0022] Wherein, the hole pattern of the threaded hole does not have rotational symmetry, so in particular the threaded holes are unevenly spaced from each other in the circumferential direction. The advantage here is that the relative rotational position of the sealing cover relative to the bearing cover can be determined by means of the hole pattern.
[0023] In an advantageous design, a second annular groove concentric with the first annular groove is formed at the sealing cover, and the groove depth of the second annular groove, especially the axial depth, is less than the groove depth of the first annular groove, especially the axial depth. The advantage here is that the annular groove forms a labyrinth seal.
[0024] In an advantageous design, the second annular groove is radially arranged outside the first annular groove. The advantage here is that the two annular grooves form a labyrinth seal, and thus form a non-contact seal, so that although the sealing performance is improved, the efficiency of the speed reducer is not affected.
[0025] In an advantageous design, the oil deflector has a third annular groove that opens in the radial direction, and a flake ring is arranged in this third annular groove.
[0026] Wherein, the oil deflector has a first annular protrusion that extends into the first annular groove.
[0027] Wherein, the oil deflector has a second annular protrusion that extends into the second annular groove.
[0028] - Wherein, the oil deflector is sleeved onto the output shaft and is connected to the output shaft in a non-rotatable relative manner.
[0029] - Or wherein, the oil deflector is connected to a bearing nut screwed onto the output shaft in a non-rotatable relative manner.
[0030] The advantage here is that a labyrinth seal is constructed.
[0031] In an advantageous design, the first annular protrusion and the second annular protrusion have the same axial height.
[0032] In particular, the space region filled with grease and air in the first annular groove has a larger volume than the space region filled with grease and air in the second annular groove. The advantage here is that the first annular groove has a grease storage part.
[0033] In an advantageous design, the first annular groove and the second annular groove open in the axial direction respectively.
[0034] In particular, wherein the third annular groove opens in the radial direction. The advantage here is that a centrifugal separation effect can be achieved in the third annular groove, especially by arranging the flake ring arranged in the third annular groove, and the first annular groove and the second annular groove form a labyrinth seal.
[0035] In an advantageous design, the material of the sealing cover is a material different from that of the bearing cover. The advantage here is that each of the two cover parts can be optimized according to its mechanical or chemical requirements. In particular, it can be implemented such that the sealing cover is made of aluminum while the bearing cover is made of steel.
[0036] In an advantageous design, the sealing cover is made of a material different from that of the bearing cover. The advantage here is that each of the two cover parts can be optimized according to its mechanical and chemical requirements. In particular, it can be implemented such that the sealing cover is composed of aluminum and the bearing cover is composed of steel.
[0037] In an advantageous design, the radial range covered by the first annular groove is arranged radially inside the radial range covered by the bearing cover or overlaps with the radial range covered by the bearing cover. The advantage here is that the second radial hole serves as a grease reservoir, and the two-part axial hole is arranged radially outside the first annular groove.
[0038] In an advantageous design, the two-part axial hole is arranged radially outside the first annular groove. The advantage here is that the first radial hole serving as a connection not only serves as a connection part but also as a grease reservoir.
[0039] Further advantages are given by the dependent claims. The invention is not limited to the feature combinations of the claims. For a person skilled in the art, in particular with regard to the object set and / or the object resulting from a comparison with the prior art, other reasonable combination possibilities of the claims and / or single claim features and / or features of the description and / or features of the drawings can be obtained. Description of the Drawings
[0040] The invention will now be further explained with the aid of schematic drawings. Among them:
[0041] In Figure 1 a sectional view of a speed reducer according to the invention is shown.
[0042] In Figure 2 the area of Figure 1 is shown enlarged.
[0043] List of Reference Signs:
[0044] 1 bearing cover
[0045] 2 grease supply line
[0046] 3 sealing cover
[0047] 4 screw plug
[0048] 5 oil baffle ring
[0049] 6 plate ring
[0050] 10 output shaft
[0051] 11 housing Detailed Description of the Invention
[0052] As shown in the drawings, the speed reducer has a housing 11 which has a through bearing hole for receiving the bearing of the output shaft 10.
[0053] The interior space of the speed reducer is at least partially filled with oil.
[0054] The bearing of the output shaft is sealed towards the environment by means of a labyrinth seal.
[0055] The annular bearing cover 1 projects partially into the bearing hole and is thereby centered. In addition, the annular bearing cover 1 is axially spaced apart from the bearing of the output shaft, in particular from the outer ring of the bearing, i.e. in the direction parallel to the axis of rotation of the output shaft 10.
[0056] The ring axis of the annular bearing cover 1 is coaxial with the rotational axis of the output shaft 10.
[0057] The annular sealing cover 3 projects partially into the ring opening of the annular bearing cover and is thus centered.
[0058] A shaft seal ring is received radially inside the sealing cover 3, which seals relative to the output shaft 10.
[0059] The oil deflector ring 5 projects into the ring opening of the sealing cover 3 axially spaced apart from the shaft seal ring, is slipped onto the output shaft 10, and is connected to the output shaft in a non-rotatable manner.
[0060] The sealing cover 3 has two radially spaced-apart annular grooves on its axial end face facing the bearing cover 1, and the corresponding annular projections of the oil deflector ring 5 project at least partially into the annular grooves.
[0061] Here, the groove depth, in particular the axial depth, of the first annular groove of the two annular grooves is deeper than the groove depth, in particular the axial depth, of the other annular groove of the two annular grooves.
[0062] A first radial hole is formed in the sealing cover 3, which leads into the first annular groove of the two annular grooves and thus serves as a reservoir for grease together with the first annular groove of the two annular grooves.
[0063] The first radial hole is closed relative to the environment by means of a screw plug 4.
[0064] The axial hole formed into the sealing cover 3 and leading to the first radial hole is implemented in two parts. The first section of the axial hole is formed in the sealing cover 3, while the second section of the axial hole is formed in the bearing cover 1 and leads into a second radial hole, which is formed into the bearing cover 1, and the grease supply line 2 is connected to the second radial hole.
[0065] Thus, grease can be fed to the second radial hole via the grease supply line 2, and then the grease can be fed to the first radial hole via the first and second sections of the axial hole, which serves as a grease reservoir together with the first annular groove.
[0066] A leaf ring 6 is received in the oil deflector ring 5, in particular in a third annular groove opening radially towards the environment, and the laminated ring seals towards the sealing cover 3.
[0067] The first annular groove and the second annular groove open axially towards the environment, in particular towards the sealing cover 3.
[0068] The first annular groove is arranged radially inside the second annular groove.
[0069] The radial direction, the axial direction, and the circumferential direction are based on the direction of the rotational axis of the output shaft 10, respectively.
[0070] Therefore, the conveyance of the grease is achieved through different parts, namely, through the bearing cover 1 and the sealing cover 3. In order to align the sections of the two-part axial hole, the rotational positions of the bearing cover 1 and the sealing cover 3 can be coordinated with each other. This requires a certain precision in manufacturing.
[0071] The grease conveyed into the first annular groove improves the sealing performance. In the event of an emergency where frictional contact may occur, the frictional heat is reduced by the grease.
[0072] The radial range covered by the two annular grooves is surrounded by the radial range covered by the radial holes of the sealing cover 3. The two annular grooves are spaced apart from each other radially and are arranged on the side of the oil baffle ring 5 facing the bearing cover 1.
[0073] The sealing cover 3 is fixed to the bearing cover 1 by a threaded member that is screwed into the axially directed threaded hole of the bearing cover 1. Although both the threaded member and / or the threaded hole are arranged at the same radial distance from the rotational axis of the output shaft 10, the hole pattern of the threaded hole does not have rotational symmetry, especially to ensure the rotational position more simply during assembly.
[0074] In other embodiments according to the present invention, the bearing cover 1 is made of a different material from the sealing cover 3.
Claims
1. A speed reducer having a housing, The housing has a through-bearing hole, and a bearing is received in the bearing hole. The bearing rotatably supports the output shaft of the speed reducer, The annular bearing cover of the speed reducer has a first flange region protruding axially, and the first flange region extends into the bearing hole, especially abuts against the hole wall of the bearing hole, The annular seal cover of the speed reducer has a second flange region protruding axially, and the second flange region extends into the ring opening of the bearing cover, especially abuts against the inner wall of the ring opening, It is characterized in that, The sealing cover has a first annular groove on the side facing away from the bearing cover, and a first radial hole of the sealing cover leads into this first annular groove. A second radial hole of the bearing cover is connected to the first radial hole of the sealing cover through a two-part axial hole. A first section of the axial hole is arranged in the bearing cover, and a second section of the axial hole is arranged in the sealing cover. In particular, the first section is aligned with the second section.
2. The speed reducer according to claim 1, characterized in that, A shaft seal ring is received in the second flange region, and this shaft seal ring seals against the output shaft or against a spacer sleeve pushed onto the output shaft. In particular, the sealing lip of the shaft seal ring contacts the output shaft, a sealing seat is formed in the second flange region, and the shaft seal ring is sleeved onto the sealing seat. In particular, the spacer sleeve is axially arranged between the inner ring of the bearing sleeved onto the output shaft and the bearing nut screwed onto the output shaft.
3. The speed reducer according to any one of the above claims, characterized in that, The first radial hole of the sealing cover is closed relative to the environment by a screw plug.
4. The speed reducer according to any one of the above claims, characterized in that, The first radial hole of the sealing cover has a larger inner diameter than the axial hole.
5. The speed reducer according to any one of the above claims, characterized in that, A grease supply line is connected to the second radial hole of the bearing cover.
6. The speed reducer according to any one of the above claims, characterized in that, The sealing cover is fixed to the bearing cover by a threaded part, and this threaded part is screwed into an axially directed threaded hole of the bearing cover. Both the threaded part and / or the threaded hole are arranged at the same radial distance from the rotational axis of the output shaft. The hole pattern of the threaded hole does not have rotational symmetry, that is, in particular, the threaded holes are not evenly spaced from each other in the circumferential direction.
7. The speed reducer according to any one of the above claims, characterized in that, A second annular groove concentric with the first annular groove is formed in the sealing cover, and the groove depth of this second annular groove, especially the axial depth, is less than the groove depth of the first annular groove, especially the axial depth.
8. The speed reducer according to any one of the above claims, characterized in that, The second annular groove is radially arranged outside the first annular groove.
9. The speed reducer according to any one of the above claims, characterized in that, The oil deflector has a third annular groove opening in the radial direction, and a flake ring is arranged in this third annular groove. The oil deflector has a first annular projection that extends into the first annular groove. The oil deflector has a second annular projection that extends into the second annular groove. - The oil deflector is pushed onto the output shaft and connected to the output shaft in a non-rotatable manner, or - The oil deflector is connected to the bearing nut screwed onto the output shaft in a non-rotatable manner.
10. The speed reducer according to any one of the above claims, characterized in that, The first annular projection and the second annular projection have the same axial height, especially such that the space region filled with grease and air in the first annular groove has a larger volume than the space region filled with grease and air in the second annular groove.
11. The speed reducer according to any one of the above claims, characterized in that, The first annular groove and the second annular groove open in the axial direction respectively, and in particular, the third annular groove opens in the radial direction.
12. The speed reducer according to any one of the above claims, characterized in that, The material of the sealing cover is a material different from that of the bearing cover, and / or the sealing cover is made of a material different from that of the bearing cover.
13. The speed reducer according to any one of the above claims, characterized in that, The radial range covered by the first annular groove is radially arranged inside the radial range covered by the bearing cover, or overlaps with the radial range covered by the bearing cover.
14. The speed reducer according to any one of the above claims, characterized in that, The two-part axial hole is radially arranged outside the first annular groove.