Transmission lubricating structure

Abstract

The utility model belongs to the field of transmissions, and particularly relates to a transmission lubricating structure. The structure comprises an oil collecting sleeve mounted on the input shaft and positioned on the inner and outer circumferential surfaces of the mounting space; a first annular groove is formed in the peripheral surface of the oil collecting sleeve, a first oil guide hole is formed in the position, located at the bottom of the first annular groove, of the oil collecting sleeve, an oil collecting structure is arranged on the second shell, and the oil outlet end of the oil collecting structure communicates with the outer end of the first oil guide hole through the first annular groove; a second oil guide hole is formed in the gear tooth holder; the input shaft is provided with a main oil duct, and a first branch oil duct and a second branch oil duct which are respectively communicated with the main oil duct; and the first branch oil channel and the second branch oil channel are respectively communicated with the inner ends of the first oil guide hole and the second oil guide hole. Through the arrangement of the oil ducts between the parts, the weak lubrication position of the transmission is lubricated, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The utility model relates to a lubrication structure, in particular to a transmission lubrication structure. Background Art

[0002] At present, the mechanical transmissions on the market are mainly lubricated by lubricating oil, and the circulation of lubricating oil will also provide better heat dissipation for the parts inside the transmission. The gears inside the existing transmission are generally splash lubricated to bring the lubricating oil to the gears for lubrication.

[0003] However, since nearby gears do not mesh and rotate under normal working conditions in some positions inside the transmission, it is not conducive for the lubricating oil to splash to this position, resulting in poor lubrication effect at this position, which can easily lead to a shortened transmission life and increased failure rate.

[0004] Therefore, in order to increase the service life of the transmission and reduce the failure rate, strengthening the lubrication of specific parts is an important consideration in transmission design. Utility Model Content

[0005] The utility model aims to solve the technical problem that in some positions inside the existing transmission, nearby gears do not mesh and rotate under normal working conditions, which is not conducive to lubricating the lubricating oil to this position through splashing, resulting in poor lubrication effect at this position, which in turn easily leads to shortened transmission life and increased failure rate, and provides a transmission lubrication structure.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A transmission lubrication structure, the transmission comprising an input shaft, a first bearing, a first housing, a gear tooth seat, a second housing, a second bearing, a gear and a needle bearing;

[0008] The first housing and the second housing are assembled as one body, and an installation space is provided between the two; a first shaft hole matched with the first bearing and a second shaft hole matched with the second bearing are respectively provided on the side walls of the first housing and the second housing, and the first bearing and the second bearing are respectively installed in the first shaft hole and the second shaft hole; the input shaft passes through the inner holes of the first bearing and the second bearing in sequence, and transitionally fits with the inner holes; the gear tooth seat is installed on the outer peripheral surface of the input shaft located in the installation space, and the gear tooth seat is arranged close to the side of the first bearing, and the gear is installed on the gear tooth seat through a needle roller bearing;

[0009] Its special features are:

[0010] It also includes an oil collecting sleeve installed on the inner and outer circumferential surfaces of the input shaft located in the installation space; the oil collecting sleeve is arranged close to one side of the second bearing, and its two end surfaces are respectively in contact with the gear seat and the inner end surface of the inner ring of the second bearing;

[0011] A first annular groove is provided on the outer circumferential surface of the oil collecting sleeve, and at least one first oil guide hole is provided on the bottom of the first annular groove of the oil collecting sleeve, and an oil collecting structure for collecting lubricating oil is provided on the second housing, and the oil outlet end of the oil collecting structure is connected with the outer end of the first oil guide hole through the first annular groove;

[0012] At least one second oil guide hole is provided on the gear tooth seat, and the outer end of the second oil guide hole is located on the outer peripheral surface of the matching position of the gear tooth seat and the needle roller bearing;

[0013] The input shaft is provided with a main oil passage, and at least one first branch oil passage and at least one second branch oil passage respectively connected to the main oil passage; the first branch oil passage and the second branch oil passage are respectively connected to the inner ends of the first oil guide hole and the second oil guide hole.

[0014] Furthermore, a second annular groove is provided on the inner circumferential surface of the oil collecting sleeve, and the second annular groove is connected with the first annular groove through the first oil guide hole;

[0015] A third annular groove is provided on the inner circumferential surface of the gear tooth seat, and the third annular groove is connected to the inner end of the second oil guide hole;

[0016] The first oil branch passage and the second oil branch passage are communicated with the second annular groove and the third annular groove respectively.

[0017] Further, the first oil guide hole, the second oil guide hole, the first oil branch channel and the second oil branch channel are respectively arranged along the radial direction of the oil collecting sleeve, the gear tooth seat and the input shaft, and the main oil channel is arranged along the axial direction of the input shaft;

[0018] The number of the first oil guide hole, the second oil guide hole, the first oil branch channel and the second oil branch channel are all four, and they are evenly arranged along the circumferential direction.

[0019] Furthermore, one end of the main oil channel is opened, and a sealing bowl plug is provided at the opening.

[0020] Furthermore, the oil collecting sleeve includes an oil collecting ring, and two annular bosses respectively arranged on two end surfaces of the oil collecting ring;

[0021] The first annular groove and the first oil guide hole are both arranged on the oil collecting ring;

[0022] The outer end surface of one of the annular bosses abuts against the inner end surface of the second bearing inner ring, and the outer end surface of the other annular boss abuts against one end of the gear tooth seat;

[0023] An annular step is arranged on the inner wall of the second housing at the second axial hole, a gap is arranged between the inner circumference of the annular step and the outer circumference of the oil collecting ring, and the oil outlet end of the oil collecting structure is located on the inner circumference of the annular step.

[0024] Further, the oil collecting structure includes an oil collecting groove arranged on the outer wall of the second shell and a lubricating oil passage having one end connected to the oil collecting groove;

[0025] The other end of the lubricating oil passage serves as the oil outlet end of the oil collecting structure and is connected to the first annular groove.

[0026] Furthermore, the oil collecting groove is a V-shaped groove, and one end of the lubricating oil channel is located at the bottom end of the V-shaped groove.

[0027] Further, the lubricating oil passage includes an inclined section and a radial section;

[0028] The high end of the inclined section is connected to the oil collecting groove, the low end is connected to the outer end of the radial section, and the inner end of the radial section serves as the oil outlet end of the oil collecting structure and is connected to the first annular groove.

[0029] The beneficial effects of the utility model are:

[0030] 1. The utility model aims to solve the problem that when the input shaft rotates under normal conditions, the gears do not rotate, resulting in a lack of splash lubrication at the needle bearing. Through the lubrication structure of the utility model, the lubricating oil splashed onto the surface of the second housing can be collected by the oil collecting structure on the second housing, and the lubricating oil can be guided to the needle bearing to enhance the lubrication there, thereby reducing the failure rate of the transmission and increasing its service life.

[0031] 2. The utility model lubricates the weak lubrication positions of the transmission only by setting oil channels between parts without adding a forced lubrication system such as an oil pump, and has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0033] Figure 2 It is a structural schematic diagram of the oil collecting sleeve in the embodiment of the utility model;

[0034] Figure 3 It is a structural schematic diagram of the oil collecting structure in the embodiment of the utility model.

[0035] In the figure: 1-input shaft, 2-first bearing, 3-first housing, 4-gear tooth seat, 5-second housing, 6-second bearing, 7-gear, 8-needle bearing, 9-oil collecting sleeve, 91-oil collecting ring, 92-annular boss; 10-first annular groove, 11-first oil guide hole, 12-oil collecting structure, 121-oil collecting groove, 122-lubricating oil channel; 1221-inclined section, 1222-radial section; 13-second oil guide hole, 14-main oil channel, 15-first oil distribution channel, 16-second oil distribution channel, 17-second annular groove, 18-third annular groove, 19-sealing bowl plug. DETAILED DESCRIPTION

[0036] In order to make the purpose, advantages and features of the utility model clearer, the following is a further detailed description of a transmission lubrication structure proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the utility model will be clearer.

[0037] See also Figure 1-Figure 3 A transmission lubrication structure of this embodiment mainly includes an input shaft 1, a first bearing 2, a first housing 3, a gear tooth seat 4, a second housing 5, a second bearing 6, a gear 7, a needle bearing 8 and an oil collecting sleeve 9.

[0038] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] See also Figure 1 In this embodiment, the first housing 3 and the second housing 5 are assembled as one body, and an installation space for installing the gear tooth seat 4, the oil collecting sleeve 9, the gear 7 and the needle bearing 8 is provided between the two. The first shaft hole adapted to the first bearing 2 is provided on the side wall of the first housing 3, and the second shaft hole adapted to the second bearing 6 is provided on the side wall of the second housing 5. The first bearing 2 is installed in the first shaft hole, and the second bearing 6 is installed in the second shaft hole. The input shaft 1 passes through the inner holes of the first bearing 2 and the second bearing 6 in turn, and is supported by the first bearing 2 and the second bearing 6. The outer peripheral surface of the input shaft 1 and the inner holes of the first bearing 2 and the second bearing 6 are transitionally matched.

[0040] The gear tooth seat 4 and the oil collecting sleeve 9 are respectively installed on the outer peripheral surface of the input shaft 1 located in the installation space, and the gear tooth seat 4 is arranged close to the first bearing 2; the specific installation method of the gear tooth seat 4 is interference fit, and the specific installation method of the oil collecting sleeve 9 is transition fit, and the gear tooth seat 4 and the oil collecting sleeve 9 rotate together with the input shaft 1. The oil collecting sleeve 9 is arranged close to the second bearing 6, and its two end faces are respectively in contact with the inner end face of the gear tooth seat 4 and the inner ring of the second bearing 6.

[0041] Specifically, in a preferred embodiment of the present invention, see Figure 2 The oil collecting sleeve 9 specifically includes an oil collecting ring 91 and two annular bosses 92 respectively arranged on the two end surfaces of the oil collecting ring 91. The outer end surface of one annular boss 92 abuts against the inner end surface of the inner ring of the second bearing 6, and the outer end surface of the other annular boss 92 abuts against one end of the gear tooth seat 4.

[0042] A first annular groove 10 is provided on the outer circumferential surface of the oil collecting ring 91, and a second annular groove 17 is provided on the inner circumferential surface. The first annular groove 10 and the second annular groove 17 are connected through at least one first oil guide hole 11. In this embodiment, the first oil guide hole 11 is provided along the radial direction of the oil collecting ring 91, and the number of the first oil guide holes 11 is four, and the four first oil guide holes 11 are evenly arranged along the circumferential direction. Of course, in other embodiments of the utility model, the number of the first oil guide holes 11 can be set according to actual needs.

[0043] An annular step is provided on the inner wall of the second housing 5 at the second axial hole, and a gap is provided between the inner circumference of the annular step and the outer circumference of the oil collecting ring 91. The gap is small enough to avoid a large amount of lubricating oil leakage, while meeting the need for the oil collecting ring 91 to rotate together with the input shaft 1.

[0044] An oil collecting structure 12 for collecting lubricating oil is provided on the second housing 5 . The oil outlet end of the oil collecting structure 12 is located on the inner circumferential surface of the annular step and is connected to the outer end of the first oil guide hole 11 through the first annular groove 10 .

[0045] Specifically, in a preferred embodiment of the present invention, the oil collecting structure 12 specifically includes an oil collecting groove 121 disposed on the outer wall of the second housing 5 and a lubricating oil passage 122 having one end connected to the oil collecting groove 121. The other end of the lubricating oil passage 122 serves as the oil outlet end of the oil collecting structure 12 and is connected to the first annular groove 10.

[0046] For more details, see Figure 1 and Figure 3 The oil collecting groove 121 is a V-shaped groove, and one end of the lubricating oil passage 122 is located at the bottom end of the V-shaped groove. The lubricating oil passage 122 includes an inclined section 1221 and a radial section 1222; the upper end of the inclined section 1221 is connected to the oil collecting groove 121, and the lower end is connected to the outer end of the radial section 1222. The inner end of the radial section 1222 is used as the oil outlet end of the oil collecting structure 12 and is connected to the first annular groove 10. Through the design of the above-mentioned oil collecting structure 12, the lubricating oil splashed on the outer wall of the second housing 5 can be collected, and the lubricating oil is introduced into the first annular groove 10 through the oil collecting groove 121, the inclined section 1221, and the radial section 1222 in sequence.

[0047] At least one second oil guide hole 13 is provided on the gear tooth seat 4, and the outer end of the second oil guide hole 13 is located on the outer circumferential surface of the gear tooth seat 4 and the needle bearing 8. Preferably, the second oil guide holes 13 are arranged along the radial direction of the gear tooth seat 4, and there are four of them, and the four second oil guide holes 13 are evenly distributed along the circumferential direction.

[0048] The input shaft 1 is provided with a main oil passage 14, and at least one first branch oil passage 15 and at least one second branch oil passage 16 respectively connected to the main oil passage 14; the first branch oil passage 15 and the second branch oil passage 16 are respectively connected to the inner ends of the first oil guide hole 11 and the second oil guide hole 13. Preferably, one end of the main oil passage 14 is opened, and a sealing bowl plug 19 is provided at the opening to seal the main oil passage 14. The first branch oil passage 15 and the second branch oil passage 16 are both arranged along the axial direction of the input shaft 1, and the number is four, and the four first branch oil passages 15 and the second branch oil passages 16 are evenly arranged along the circumferential direction.

[0049] The first oil channel 15 and the second oil channel 16 are connected to the second annular groove 17 and the third annular groove 18 respectively, so that during assembly, it is not necessary to accurately connect the first oil channel 15 and the second oil channel 16 with the first oil guide hole 11 and the second oil guide hole 13 to meet the circulation needs of the lubricating oil, thereby achieving the purpose of reducing the difficulty of installation.

[0050] The gear 7 in this embodiment is mounted on the gear tooth seat 4 through a needle bearing 8. Under normal conditions, when the gear tooth seat 4 rotates together with the input shaft 1, the gear 7 does not rotate therewith. When the gear tooth seat 4 and the gear 7 are connected through an external sliding sleeve (not shown in the figure), the gear 7 rotates together with the input shaft 1 and the gear tooth seat 4.

[0051] When the transmission starts to work, the input shaft 1 starts to rotate, the gear tooth seat 4 and the oil collecting sleeve 9 rotate together at the same angular speed, and the gear 7 does not rotate with them. At this time, the needle bearing 8 lacks lubrication;

[0052] The lubricating oil collected by the second housing 5 through the oil collecting groove 121 and the lubricating oil passage 122 flows into the first annular groove 10 on the outer edge of the oil collecting sleeve 9 due to gravity, and further flows into the second annular groove 17 near the inner hole of the oil collecting sleeve 9 through the first oil guide hole 11 of the oil collecting sleeve 9. At this time, the lubricating oil in the second annular groove 17 will flow into the main oil passage 14 of the input shaft 1 through the first oil branch passage 15 of the input shaft 1. As the lubricating oil accumulates more and more in the main oil passage 14 until it is full, the lubricating oil is finally guided to the needle bearing 8 through the second oil branch passage 16, the third annular groove 18 and the second oil guide hole 13, thereby enhancing the lubrication effect at the position where it is difficult to rely on the splashing lubrication of the lubricating oil.

Claims

1. A transmission lubrication structure, the transmission comprising an input shaft (1), a first bearing (2), a first housing (3), a gear tooth seat (4), a second housing (5), a second bearing (6), a gear (7) and a needle roller bearing (8); The first housing (3) and the second housing (5) are assembled as one body, and an installation space is provided between the two; a first axial hole matched with the first bearing (2) and a second axial hole matched with the second bearing (6) are respectively provided on the side walls of the first housing (3) and the second housing (5); the first bearing (2) and the second bearing (6) are respectively installed in the first axial hole and the second axial hole; the input shaft (1) passes through the inner holes of the first bearing (2) and the second bearing (6) in sequence, and is transitionally matched with the inner holes; the gear tooth seat (4) is installed on the outer peripheral surface of the input shaft (1) located in the installation space, and is arranged close to the first bearing (2); the gear (7) is installed on the gear tooth seat (4) through a needle bearing (8); Features: It also includes an oil collecting sleeve (9) installed on the inner and outer peripheral surfaces of the input shaft (1) located in the installation space; the oil collecting sleeve (9) is arranged close to one side of the second bearing (6), and its two end surfaces are respectively in contact with the gear seat (4) and the inner end surface of the inner ring of the second bearing (6); The outer peripheral surface of the oil collecting sleeve (9) is provided with a first annular groove (10), and the oil collecting sleeve (9) is provided with at least one first oil guide hole (11) at the bottom of the first annular groove (10); the second housing (5) is provided with an oil collecting structure (12) for collecting lubricating oil, and the oil outlet end of the oil collecting structure (12) is connected to the outer end of the first oil guide hole (11) through the first annular groove (10); At least one second oil guide hole (13) is provided on the gear tooth seat (4), and the outer end of the second oil guide hole (13) is located on the outer peripheral surface of the matching portion between the gear tooth seat (4) and the needle roller bearing (8); The input shaft (1) is provided with a main oil passage (14), and at least one first branch oil passage (15) and at least one second branch oil passage (16) respectively connected to the main oil passage (14); the first branch oil passage (15) and the second branch oil passage (16) are respectively connected to the inner ends of the first oil guide hole (11) and the second oil guide hole (13).

2. A transmission lubrication structure according to claim 1, characterized in that: A second annular groove (17) is provided on the inner circumferential surface of the oil collecting sleeve (9), and the second annular groove (17) is connected to the first annular groove (10) through the first oil guide hole (11); A third annular groove (18) is provided on the inner circumferential surface of the gear tooth seat (4), and the third annular groove (18) is connected to the inner end of the second oil guide hole (13); The first oil branch passage (15) and the second oil branch passage (16) are respectively connected to the second annular groove (17) and the third annular groove (18).

3. A transmission lubrication structure according to claim 2, characterized in that: The first oil guide hole (11), the second oil guide hole (13), the first oil branch passage (15) and the second oil branch passage (16) are respectively arranged along the radial direction of the input shaft (1), and the main oil passage (14) is arranged along the axial direction of the input shaft (1); The number of the first oil guide hole (11), the second oil guide hole (13), the first oil distribution channel (15) and the second oil distribution channel (16) are all four, and they are evenly arranged along the circumferential direction.

4. A transmission lubrication structure according to claim 3, characterized in that: One end of the main oil passage (14) is open, and a sealing bowl plug (19) is provided at the opening.

5. A transmission lubrication structure according to any one of claims 1 to 4, characterized in that: The oil collecting sleeve (9) comprises an oil collecting ring (91) and two annular bosses (92) respectively arranged on two end surfaces of the oil collecting ring (91); The first annular groove (10) and the first oil guide hole (11) are both arranged on the oil collecting ring (91); The outer end surface of one of the annular bosses (92) abuts against the inner end surface of the inner ring of the second bearing (6), and the outer end surface of the other annular boss (92) abuts against the gear tooth seat (4); An annular step is provided on the inner wall of the second housing (5) at the second axial hole, a gap is provided between the inner circumference of the annular step and the outer circumference of the oil collecting ring (91), and the oil outlet end of the oil collecting structure (12) is located on the inner circumference of the annular step.

6. A transmission lubrication structure according to claim 5, characterized in that: The oil collecting structure (12) comprises an oil collecting groove (121) arranged on the outer wall of the second housing (5) and a lubricating oil passage (122) one end of which is connected to the oil collecting groove (121); The other end of the lubricating oil passage (122) serves as the oil outlet end of the oil collecting structure (12) and is connected to the first annular groove (10).

7. A transmission lubrication structure according to claim 6, characterized in that: The oil collecting groove (121) is a V-shaped groove, and one end of the lubricating oil channel (122) is located at the bottom end of the V-shaped groove.

8. A transmission lubrication structure according to claim 7, characterized in that: The lubricating oil channel (122) comprises an inclined section (1221) and a radial section (1222); The high end of the inclined section (1221) is connected to the oil collecting groove (121), and the low end is connected to the outer end of the radial section (1222). The inner end of the radial section (1222) serves as the oil outlet end of the oil collecting structure (12) and is connected to the first annular groove (10).

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