reduction gearbox

Abstract

The application discloses a reduction gearbox, comprising a housing, a first transmission mechanism and a second transmission mechanism. The housing has an internal space, and the internal space of the housing comprises a first accommodating space, a second accommodating space, a third accommodating space and a fourth accommodating space. The first transmission mechanism is arranged in the internal space and comprises a first bearing, a first tooth part, a first shaft rod and a second bearing coaxial with each other, wherein the first bearing is accommodated in the first accommodating space, and the second bearing is accommodated in the third accommodating space. The second transmission mechanism is arranged in the internal space and comprises a third bearing, a second tooth part, a second shaft rod and a fourth bearing coaxial with each other, wherein the third bearing is accommodated in the second accommodating space, and the fourth bearing is accommodated in the fourth accommodating space. The housing is further formed with a first oil baffle, a first oil guide groove and a second oil guide groove.

Description

TECHNICAL FIELD

[0001] The present invention relates to a reduction gear box, and more particularly, to a reduction gear box having a lubricating oil guiding structure provided in a housing. BACKGROUND

[0002] There are two methods for supplementing lubricating oil to bearings in a conventional reduction gear box. The first method is to supply lubricating oil to bearings at regular intervals by means of a lubricating oil supply device. The second method is to cause lubricating oil contained in the bottom of the reduction gear box to be splashed by high-speed rotation of gears in the reduction gear box, and to supplement the lubricating oil to bearings when the splashed lubricating oil reaches the bearings.

[0003] However, the first method requires the addition of a lubricating oil supply device to the reduction gear box, thereby complicating the structure of the reduction gear box. The second method does not require the addition of a lubricating oil supply device, but the direction of the splashed lubricating oil is not easily controlled, thereby limiting the lubricating effect. SUMMARY

[0004] An object of the present invention is to provide a reduction gear box that solves the above problems.

[0005] According to an embodiment of the present invention, there is provided a reduction gear box including a housing, a first transmission mechanism, and a second transmission mechanism. The housing defines an internal space, and an inner surface of the housing forms a first receiving space, a second receiving space, a third receiving space, and a fourth receiving space. The first transmission mechanism is disposed in the internal space and includes a first bearing, a first tooth portion, a first shaft, and a second bearing coaxial with each other, wherein the first bearing is received in the first receiving space, and the second bearing is received in the third receiving space. The second transmission mechanism is disposed in the internal space and includes a third bearing, a second tooth portion, a second shaft, and a fourth bearing coaxial with each other, wherein the third bearing is received in the second receiving space, the fourth bearing is received in the fourth receiving space, and the second tooth portion is engaged with the first tooth portion. The housing further forms a first oil baffle, a first oil guide groove, and a second oil guide groove, the first oil baffle partially surrounds the first receiving space and the second receiving space and corresponds to the first oil guide groove and the second oil guide groove, respectively, the first oil guide groove communicates the internal space with the first receiving space, and the second oil guide groove communicates the internal space with the second receiving space.

[0006] According to the foregoing reduction gear box, the inner surface of the housing can form a first surrounding wall surrounding the first receiving space, and the first surrounding wall can form an opening or a slot corresponding to the first oil guide groove.

[0007] According to the foregoing reduction gear box, the inner surface of the housing can form a second surrounding wall surrounding the second receiving space, and the second surrounding wall can form an opening or a slot corresponding to the second oil guide groove.

[0008] According to the foregoing reduction gearbox, the first transmission mechanism can define an axial direction, and the first oil baffle protrudes from the inner surface of the housing along the axial direction.

[0009] According to the foregoing reduction gearbox, the housing can further form a second oil baffle, a first oil guide hole, a second oil guide hole, and an external passage. The second oil baffle corresponds to the first oil baffle and partially surrounds the first oil guide hole. The second oil guide hole is arranged at the bottom of the second accommodation space, and the first oil guide hole communicates with the second oil guide hole through the external passage. The second shaft rod can include a hollow portion that communicates the second oil guide hole and the fourth accommodation space.

[0010] According to the foregoing reduction gearbox, the first transmission mechanism can define an axial direction, and the second oil baffle protrudes from the inner surface of the housing along the axial direction.

[0011] According to the foregoing reduction gearbox, the first transmission mechanism can further include a differential device, a fifth bearing, and a support plate. The differential device is arranged between the first bearing and the first shaft rod. The fifth bearing and the support plate are arranged at one end of the first shaft rod adjacent to the differential device. The support plate forms a fifth accommodation space, and the fifth bearing is accommodated in the fifth accommodation space. The support plate can form a first through hole that communicates the internal space and the fifth accommodation space. The support plate can form a second through hole, and the first transmission mechanism can further include an oil guide structure. The oil guide structure can have a groove. One end of the groove corresponds to the position of the second through hole, and the other end of the groove corresponds to the third accommodation space.

[0012] According to the foregoing reduction gearbox, the housing can include a first shell and a second shell. The first shell and the second shell are assembled to form the housing. The first accommodation space and the second accommodation space are formed in the first shell, and the third accommodation space and the fourth accommodation space are formed in the second shell.

[0013] The reduction gearbox of the present application has the first oil baffle, the first oil guide groove, and the second oil guide groove formed in the housing. This facilitates guiding lubricating oil to the first accommodation space and the second accommodation space that accommodate the first bearing and the third bearing, thereby improving the lubrication effect. In addition, the first oil baffle, the first oil guide groove, and the second oil guide groove are formed in the housing, which does not require additional parts, thereby simplifying the structure of the reduction gearbox and reducing the volume of the reduction gearbox. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of a reduction gearbox according to an embodiment of the present application.

[0015] Figure 2 is Figure 1 is an exploded view of the reduction gearbox in

[0016] Figure 3 is Figure 1 is an exploded view of the reduction gearbox in another view.

[0017] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the gearbox from another perspective.

[0018] Figure 5 yes Figure 2 A three-dimensional schematic diagram of the first shell in the diagram.

[0019] Figure 6 yes Figure 2 A cross-sectional view of the combination of the first housing, the second transmission mechanism, and the second housing.

[0020] Figure 7 yes Figure 2 A three-dimensional schematic diagram of the first transmission mechanism in the diagram.

[0021] Figure 8 yes Figure 7 An exploded view of the first transmission mechanism in the diagram.

[0022] Figure 9 yes Figure 7 A three-dimensional schematic diagram of the support plate in the middle.

[0023] The reference numerals in the attached figures are explained as follows:

[0024] 1: Gearbox

[0025] 10: Outer shell

[0026] 11: First shell

[0027] 11a: First inner surface

[0028] 12: Second shell

[0029] 12a: Second inner surface

[0030] 20: Interior Space

[0031] 110: First Accommodation Space

[0032] 111: First Circumferential Wall

[0033] 112: Opening

[0034] 113: First oil guide groove

[0035] 120: Second Accommodation Space

[0036] 121: Second Surrounding Wall

[0037] 122: Grooving

[0038] 123: Second oil guide groove

[0039] 141: First oil guide hole

[0040] 142: Second oil guide hole

[0041] 143: External Channel

[0042] 150: Third Accommodation Space

[0043] 160: Fourth Accommodation Space

[0044] 200: First transmission mechanism

[0045] 210: First Bearing

[0046] 220: First tooth

[0047] 230: First shaft

[0048] 240: Second bearing

[0049] 250: Differential gear

[0050] 251: Casing

[0051] 260: Fifth Bearing

[0052] 270: Support plate

[0053] 271: Fifth Storage Space

[0054] 272: First through hole

[0055] 273: Second through hole

[0056] 280: Oil guiding structure

[0057] 281: Trench

[0058] 282, 283: End

[0059] 284, 285, 286: Installation Department

[0060] 300: Second transmission mechanism

[0061] 310: Third bearing

[0062] 320: Second tooth

[0063] 330: Second shaft

[0064] 331: Hollow section

[0065] 340: Fourth bearing

[0066] X1: First Axial Direction

[0067] X2: Second Axial Direction Detailed Implementation

[0068] Please refer to Figures 1 to 4 , Figure 1 This is a perspective view of a gearbox 1 according to an embodiment of the present invention. Figure 2 yes Figure 1 An explosion diagram of gearbox 1 in the middle. Figure 3 yes Figure 1 A schematic diagram of the explosion of gearbox 1 from another perspective. Figure 4 yes Figure 1 A three-dimensional schematic diagram of the gearbox 1 from another perspective.

[0069] The gearbox 1 includes a housing 10, a first transmission mechanism 200, and a second transmission mechanism 300. The housing 10 defines an internal space 20, the first transmission mechanism 200 is disposed in the internal space 20, and the second transmission mechanism 300 is disposed in the internal space 20.

[0070] The outer casing 10 may include a first casing 11 and a second casing 12, which are assembled together to form the outer casing 10. The first casing 11 has a first inner surface 11a, and the second casing 12 has a second inner surface 12a. The inner surface of the outer casing 10 forms a first accommodating space 110, a second accommodating space 120, a third accommodating space 150, and a fourth accommodating space 160. Specifically, the first inner surface 11a of the first casing 11 forms the first accommodating space 110 and the second accommodating space 120, and the second inner surface 12a of the second casing 12 forms the third accommodating space 150 and the fourth accommodating space 160.

[0071] The first transmission mechanism 200 defines an axial direction X1 and includes a first bearing 210, a first toothed portion 220, a first shaft 230, and a second bearing 240 that are coaxial with each other. The first bearing 210 is housed in a first accommodating space 110, and the second bearing 240 is housed in a third accommodating space 150.

[0072] The second transmission mechanism 300 defines an axial direction X2, which is preferably parallel to the axial direction X1 of the first transmission mechanism 200. The second transmission mechanism 300 includes a third bearing 310, a second toothed portion 320, a second shaft 330, and a fourth bearing 340, all coaxial with each other. The third bearing 310 is housed in a second accommodating space 120, and the fourth bearing 340 is housed in a fourth accommodating space 160, with the second toothed portion 320 meshing with the first toothed portion 220.

[0073] Reference Figure 3 and Figure 5 , Figure 5 yes Figure 2A three-dimensional schematic diagram of the first housing 11 in the outer shell 10. The first housing 11 of the outer shell 10 further forms a first oil baffle 131, a first oil guide groove 113 and a second oil guide groove 123. The first oil baffle 131 partially surrounds the first accommodating space 110 and the second accommodating space 120 and corresponds to the first oil guide groove 113 and the second oil guide groove 123 respectively. The first oil guide groove 113 connects the internal space 20 and the first accommodating space 110, and the second oil guide groove 123 connects the internal space 20 and the second accommodating space 120. Therefore, when the lubricating oil (not shown) contained in the gearbox 1 is driven upwards and splashed by the rotation of the first transmission mechanism 200 and the second transmission mechanism 300, it splashes onto the first oil baffle 131, is blocked by the first oil baffle 131 and flows downwards. With the guidance of the first oil guide groove 113, it can flow into the first receiving space 110 to lubricate the first bearing 210 contained in the first receiving space 110, or with the guidance of the second oil guide groove 123, it can flow into the second receiving space 120 to lubricate the third bearing 310 contained in the second receiving space 120. In other words, the first oil baffle 131, the first oil guide groove 113, and the second oil guide groove 123 are lubricating oil guiding structures. This can improve the lubrication effect. In addition, the first oil baffle 131, the first oil guide groove 113, and the second oil guide groove 123 are formed in the first housing 11 of the outer casing 10, which eliminates the need for additional parts, thus simplifying the structure of the gearbox 1 and reducing its volume.

[0074] Specifically, a first inner surface 11a of the first housing 11 may be formed with a first surrounding wall 111, which surrounds the first accommodating space 110. The first surrounding wall 111 has an opening 112 corresponding to a first oil guide groove 113. In other words, the first oil guide groove 113 connects the internal space 20 and the first accommodating space 110 through the opening 112 in the first surrounding wall 111. In other embodiments, a slot may be formed in the first surrounding wall 111 instead of the opening 112; the structure of the slot can be referred to as slot 122.

[0075] A second surrounding wall 121 may be formed on the first inner surface 11a of the first housing 11, surrounding the second accommodating space 120. The second surrounding wall 121 has a slot 122 corresponding to the second oil guide groove 123. In other words, the second oil guide groove 123 connects the internal space 20 and the first accommodating space 110 through the slot 122 of the second surrounding wall 121. In other embodiments, an opening may be formed in the second surrounding wall 121 instead of the slot 122; the structure of the opening can be referred to as the opening 112.

[0076] The first oil baffle 131 extends and protrudes from the first inner surface 11a of the first housing 11 along the axial direction X1, and the first oil baffle 131 is preferably U-shaped.

[0077] Please refer to the following at the same timeFigure 1 , Figure 3 and Figure 5 The first inner surface 11a of the first housing 11 may further form a second oil baffle 132, a first oil guide hole 141, and a second oil guide hole 142. The second oil baffle 132 corresponds to the first oil baffle 131 and partially surrounds the first oil guide hole 141. The second oil baffle 132 protrudes from the first inner surface 11a of the first housing 11 along the axial direction X1. The second oil guide hole 142 is located at the bottom of the second accommodating space 120. The first housing 11 may further form an external channel 143. The external channel 143 is located outside the internal space 20 of the outer casing 10 and is formed in the outer casing 10. Since the external channel 143 cannot be observed from the outside of the outer casing 10, therefore... Figure 1 The external channel 143 is indicated by a dashed line. The first oil guide hole 141 is connected to the second oil guide hole 142 through the external channel 143.

[0078] Please refer to the following at the same time Figure 6 , it is Figure 2 A cross-sectional view of the combination of the first housing 11, the second transmission mechanism 300, and the second housing 12. The second shaft 330 may include a hollow portion 331, which connects to the second oil guide hole 142 and the fourth accommodating space 160. Herein, when the lubricating oil (not shown) contained in the gearbox 1 is driven upwards by the rotation of the first transmission mechanism 200 and the second transmission mechanism 300, it splashes upwards. When it splashes onto the second oil baffle 132, it is blocked by the second oil baffle 132 and flows downwards into the first oil guide hole 141. It can then flow through the external channel 143 to the second oil guide hole 142, and then through the hollow portion 331 to the fourth accommodating space 160, thus lubricating the fourth bearing 340 contained in the fourth accommodating space 160. The flow direction of the lubricating oil is as follows... Figure 6 As indicated by the middle arrow. This improves lubrication and enables a leapfrog lubrication effect, guiding the lubricating oil from the side near the first housing 11 to the side near the second housing 12. Furthermore, the second oil baffle 132, the first oil guide hole 141, the second oil guide hole 142, and the external channel 143 are formed in the first housing 11 of the outer casing 10, while the hollow portion 331 is formed in the second shaft 330. This eliminates the need for additional parts to lubricate the fourth bearing 340, simplifying the structure of the gearbox 1 and reducing its size.

[0079] Please refer to the following at the same time Figure 7 and Figure 8 , Figure 7 yes Figure 2 A three-dimensional schematic diagram of the first transmission mechanism 200 in the diagram. Figure 8 yes Figure 7An exploded view of the first transmission mechanism 200. The first transmission mechanism 200 may further include a differential device 250, a fifth bearing 240, and a support plate 270. The differential device 250 is disposed between the first bearing 210 and the first shaft 230, and includes a housing 251, two planetary gears (not shown), and two half-shaft gears (not shown), which are housed in the housing 251. The fifth bearing 260 and the support plate 270 are disposed at one end of the first shaft 230 adjacent to the differential device 250.

[0080] Simultaneously refer to Figure 9 , it is Figure 7 A three-dimensional schematic diagram of the support plate 270 is shown. The support plate 270 forms a fifth accommodating space 271, in which a fifth bearing 260 is housed. The support plate 270 may have a first through hole 272, which connects the internal space 20 of the outer casing 10 and the fifth accommodating space 271. Herein, the lubricating oil (not shown) in the gearbox 1 is propelled upwards by the rotation of the first transmission mechanism 200 and the second transmission mechanism 300. When the lubricating oil hits the support plate 270, it can flow through the first through hole 272 to the fifth accommodating space 271, thus lubricating the fifth bearing 260 housed in the fifth accommodating space 271. This also facilitates the guidance of lubricating oil located on the side of the support plate 270 closest to the first housing 11 to the side of the support plate 270 closest to the second housing 12. In addition, the first through hole 272 is formed on the support plate 270, which eliminates the need for additional parts to lubricate the fifth bearing 260, thus simplifying the structure of the gearbox 1 and reducing its volume.

[0081] The support plate 270 may further have a second through hole 273, and the first transmission mechanism 200 may further include an oil guiding structure 280. The oil guiding structure 280 may have a groove 281, with one end 282 of the groove 281 corresponding to the position of the second through hole 273, and the other end 283 of the groove 281 corresponding to the third accommodating space 150. In this way, the lubricating oil (not shown) in the gearbox 1 is driven upward and splashed by the rotation of the first transmission mechanism 200 and the second transmission mechanism 300. When the lubricating oil hits the support plate 270, it can flow through the second through hole 273 to the groove 281 of the oil guiding structure 280, and flow along the groove 281 to the third accommodating space 150, thereby lubricating the second bearing 240 housed in the third accommodating space 150, and facilitating the guidance of the lubricating oil located on the side of the support plate 270 near the first housing 11 to the side of the support plate 270 near the second housing 12.

[0082] The oil guiding structure 280 further includes a mounting part 284, a mounting part 285, and a mounting part 286. The mounting part 284 is inserted into a corresponding hole (not shown) on the support plate 270, and the mounting parts 285 and 286 are inserted into corresponding holes (not shown) on the second housing 12. The oil guiding structure 280 is set in the existing internal space of the support plate 270. Therefore, the oil guiding structure 280 is easy to install, and the gearbox 1 does not need to add extra space to set the oil guiding structure 280, which is conducive to maintaining the miniaturization of the gearbox 1.

[0083] In summary, the gearbox of the present invention, by forming a first oil baffle, a first oil guide groove, and a second oil guide groove on the outer casing, facilitates the guidance of lubricating oil to the first and second accommodating spaces housing the first and third bearings, thereby improving the lubrication effect. Furthermore, since the first oil baffle, the first oil guide groove, and the second oil guide groove are formed on the outer casing, no additional parts are required, which simplifies the structure and reduces the size of the gearbox.

[0084] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gearbox, characterized in that, The gearbox includes: The outer shell defines the internal space, and the inner surface of the outer shell forms a first accommodating space, a second accommodating space, a third accommodating space and a fourth accommodating space; A first transmission mechanism, disposed within the internal space and comprising a first bearing, a first gear, a first shaft, and a second bearing coaxial with each other, wherein the first bearing is housed in the first accommodating space, and the second bearing is housed in the third accommodating space; and The second transmission mechanism is disposed in the internal space and includes a third bearing, a second tooth, a second shaft and a fourth bearing that are coaxial with each other, wherein the third bearing is housed in the second accommodating space, the fourth bearing is housed in the fourth accommodating space, and the second tooth meshes with the first tooth. The outer casing further comprises a first oil baffle, a first oil guide groove and a second oil guide groove. The first oil baffle partially surrounds the first accommodating space and the second accommodating space and corresponds to the first oil guide groove and the second oil guide groove respectively. The first oil guide groove connects the internal space and the first accommodating space, and the second oil guide groove connects the internal space and the second accommodating space. The inner surface of the outer shell is formed with a first surrounding wall, which surrounds the first accommodating space, and the first surrounding wall is formed with an opening or groove corresponding to the first oil guide groove. The inner surface of the housing is formed with a second surrounding wall, the second surrounding wall surrounds the second accommodating space, and the second surrounding wall is formed with an opening or groove corresponding to the second oil guide groove. The outer casing further comprises a second oil baffle, a first oil guide hole, a second oil guide hole, and an external channel. The second oil baffle corresponds to the first oil baffle and partially surrounds the first oil guide hole. The second oil guide hole is located at the bottom of the second accommodating space. The first oil guide hole communicates with the second oil guide hole through the external channel. The second shaft includes a hollow portion, which connects the second oil guide hole and the fourth accommodating space.

2. The gearbox according to claim 1, characterized in that: The first transmission mechanism defines an axial direction, and the first oil baffle protrudes from the inner surface of the housing along the axial direction.

3. The gearbox according to claim 1, characterized in that: The first transmission mechanism defines an axial direction, and the second oil baffle protrudes from the inner surface of the housing along the axial direction.

4. The gearbox according to claim 1, characterized in that: The first transmission mechanism further includes a differential device, a fifth bearing, and a support plate. The differential device is disposed between the first bearing and the first shaft. The fifth bearing and the support plate are disposed at one end of the first shaft adjacent to the differential device. The support plate forms a fifth accommodating space, and the fifth bearing is accommodated in the fifth accommodating space.

5. The gearbox according to claim 4, characterized in that: The support plate has a first through hole, which connects the internal space and the fifth accommodating space.

6. The gearbox according to claim 5, characterized in that: The support plate has a second through hole; and The first transmission mechanism further includes an oil guiding structure, which has a groove. One end of the groove corresponds to the position of the second through hole, and the other end of the groove corresponds to the third accommodating space.

7. The gearbox according to claim 1, characterized in that: The outer casing includes a first housing and a second housing, which are assembled together to form the outer casing. A first accommodating space and a second accommodating space are formed in the first housing, and a third accommodating space and a fourth accommodating space are formed in the second housing.

Images