Anti-oil-leakage agricultural machine middle gear box
By adopting a floating ring oil seal structure in the mid-mounted gear box, the oil leakage problem caused by wear of the output shaft and shell seal is solved, extending the service life and reducing the risk of leakage in rotary tillage operations.
Patent Information
- Application Number
- CN202510702385.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-08-15
AI Technical Summary
The sealing structure between the output shaft and the box shell of the existing mid-mounted gear box is prone to wear, resulting in oil leakage, and the lack of lubricating oil at the spline junction sleeve, which has a short service life and is prone to leaking during rotary tillage.
The floating ring oil sealing structure is used to seal between the output shaft and the housing. The output shaft is designed as two half-axes, and the half-axis is made of integrated with the knife shaft connecting plate, and sealing is achieved through the floating ring oil sealing structure, including a combination design of floating sealing ring, ring concave and rubber ring.
Effectively prevent wear in the sealing position, prevent oil leakage, extend the service life of the accessories, reduce the accident rate, and ensure the continuity of rotary tillage operations.
Smart Images
Figure CN120487849A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of mid-mounted gearboxes, and in particular relates to an oil-leakage-proof mid-mounted gearbox for agricultural machinery. Background Art
[0002] Mid-mounted gearboxes are widely used in various agricultural machinery such as rotary tillers, and are responsible for transmitting the power of the tractor engine to the working end such as the rotary tiller shaft.
[0003] The output shaft and the housing of the existing mid-mounted gearbox are sealed by a traditional oil seal. The traditional oil seal is an exposed skeleton type oil seal with a secondary lip. Since the rotary tiller shaft and other objects connected to the output end of the agricultural machinery mid-mounted gearbox are often bumped and subjected to unstable force during operation, the sealing part is very easy to wear. Once worn, oil leakage will occur.
[0004] In addition, the splines on the splined disc sleeves on both sides of the traditional mid-mounted gearbox are not lubricated for maintenance, are most prone to wear, and have a short service life. Usually, after two or three years of operation without oil maintenance, the splines are basically worn out and cannot be used, so they need to be replaced with new parts. In addition, since a certain distance needs to be left at the outer end of the output shaft for the splined sleeve to connect to the disc, the connecting disc end is far away from the casing, and the distance between the rotary blades on both sides is large after installation, resulting in missed tillage during rotary tillage. Summary of the Invention
[0005] In order to overcome the above technical problems, the present invention provides an oil-leakage-proof mid-mounted gearbox for agricultural machinery, which adopts a floating ring oil seal structure to seal between the output shaft and the housing to avoid wear of the sealing parts.
[0006] The present invention adopts the following technical solutions:
[0007] An oil-leakage-proof mid-mounted gearbox for agricultural machinery includes a housing, the front top of the housing is connected to an input shaft, the input shaft is connected to a small bevel gear inside the housing, the small bevel gear meshes with a large bevel gear, the large bevel gear is coaxially connected to a small gear, the small gear meshes with an intermediate gear, the intermediate gear meshes with an output gear, the output gear is sleeved on the output shaft, and both ends of the output shaft respectively pass through output holes on the left and right sides of the housing, and the output shaft and the output hole are sealed by a floating ring oil seal structure.
[0008] Preferably, the output shaft is divided into two left and right half shafts, one end of the two half shafts located inside the shell is key-connected to the output gear, and one end of the two half shafts located outside the shell is connected to the knife shaft connecting plate, and the half shafts and the knife shaft connecting plate are made as one piece.
[0009] Preferably, the floating ring oil seal structure includes: floating seal ring 1 and floating seal ring 2 which are sleeved on the outer circumference of the output shaft, ring recess 1 formed by the depression in the hole wall at the outer end of the output hole, ring recess 2 on the inner wall of the convex ring on the inner side surface of the cutter shaft connecting plate, and two rubber rings padded between ring recess 1 and floating seal ring 1 and between ring recess 2 and floating seal ring 2; the outer port diameter of ring recess 1 is large and the inner port diameter is small, while the inner port diameter of ring recess 2 is large and the outer port diameter is small.
[0010] Preferably, the inner end of the annular protrusion continues to extend toward the outer shell to form an insert ring, and the outer end surface of the output port has an annular slot, and the insert ring is located in the annular slot.
[0011] Preferably, the half shaft is rotatably connected to the output hole via a bearing, and an annular groove is provided on the inner side of the bearing of the half shaft, and a retaining ring is provided in the annular groove to prevent the half shaft from falling out.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] The present invention improves the sealing structure of the output shaft of the mid-mounted gearbox and designs a floating ring oil seal structure for sealing, which effectively prevents wear of the output shaft and the housing at the sealing position, prevents oil leakage, increases the service life of accessories, and extends the maintenance cycle;
[0014] In order to achieve the above effects, the output shaft is improved into the form of two half-shafts. The outer end of the half-shaft is made into an integral part of the cutter shaft connecting plate, which makes assembly more convenient and the structure more stable. The spline connection between the output shaft and the cutter shaft connecting plate is eliminated, reducing the accident rate. The structure is more compact and will not miss plowing. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the internal structure of the present invention;
[0016] Figure 2 It is an overall schematic diagram of the present invention;
[0017] Figure 3 It is a schematic longitudinal section diagram of the present invention;
[0018] Figure 4 yes Figure 3 Enlarged view of point A in the middle;
[0019] Figure 5 It is a schematic diagram of the output shaft structure of an existing mid-mounted gearbox.
[0020] Description of reference numerals:
[0021] 1. Housing; 2. Small bevel gear; 3. Large bevel gear; 4. Small gear; 5. Intermediate gear; 6. Output gear; 7. Cutter shaft connecting plate; 8. Axle shaft; 9. Ring groove; 10. Retaining ring; 11. Floating seal ring 1; 12. Rubber ring; 13. Ring groove 1; 14. Ring groove 2; 15. Floating seal ring 2; 16. Insert ring; 17. Slot; 18. Conventional oil seal. DETAILED DESCRIPTION
[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods in the embodiments, unless otherwise specified, are conventional methods in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.
[0023] The oil-leakage-proof mid-mounted gearbox for agricultural machinery comprises a housing 1, the front top of the housing 1 is connected to an input shaft, the input shaft is connected to a small bevel gear 2 in the housing, the small bevel gear 2 meshes with a large bevel gear 3, the large bevel gear 3 is coaxially connected to a small gear 4, the small gear 4 meshes with an intermediate gear 5, the intermediate gear 5 meshes with an output gear 6, the output gear 6 is sleeved on the output shaft, the output shaft is divided into left and right half-shafts 8, one end of the two half-shafts 8 located inside the housing 1 is keyed to the output gear 6, the two half-shafts 8 pass through the output holes on the left and right sides of the housing 1 respectively, the one end of the two half-shafts 8 located outside the housing 1 is connected to a knife shaft connecting disk 7, the half-shaft 8 and the knife shaft connecting disk 7 are made as one piece, the half-shaft 8 is rotatably connected to the output hole through a bearing, and the half-shaft 8 is provided with a ring groove 9 on the inner side of the bearing ( Figure 4 ), a retaining ring 10 is arranged in the annular groove 9, and the retaining ring 10 prevents the half shaft 8 from falling out, and the output shaft and the output hole are sealed by a floating ring oil seal structure; the floating ring oil seal structure includes: a floating seal ring 11 and a floating seal ring 2 15 which are sleeved on the outer periphery of the output shaft, a ring recess 13 formed by a depression in the hole wall at the outer end of the output hole, a ring recess 2 14 on the inner ring wall of the convex inner side surface of the cutter shaft connecting plate 7, and two rubber rings 12 padded between the ring recess 13 and the floating seal ring 11 and between the ring recess 2 14 and the floating seal ring 2 15; the outer port diameter of the ring recess 13 is large and the inner port diameter is small, and the inner port diameter of the ring recess 2 14 is large and the outer port diameter is small; the ring recess 13 and the ring recess 2 14 squeeze the rubber ring 12, so that the two floating seal rings are tightly connected.
[0024] The inner end of the annular protrusion continues to extend toward the housing 1 to form an insert ring 16 . The outer end surface of the output port has an annular slot 17 , and the insert ring 16 is located in the annular slot 17 .
[0025] The oil-leakage-proof mid-mounted gearbox for agricultural machinery is used as follows:
[0026] The transmission process is the same as that of the existing gearbox; the floating seal ring 11, the floating seal ring 2 15, the ring concave 13, the ring concave 2 14, and the rubber ring 12 form a floating ring oil seal structure. Figure 5 The conventional oil seal 18 in the system effectively prevents wear on the output shaft seal, prevents oil leakage, and extends the maintenance cycle.
[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. An oil-leakage-proof mid-mounted gearbox for agricultural machinery, comprising a housing, the front top of which is connected to an input shaft, which is connected to a small helical bevel gear within the housing, which engages a large helical bevel gear, which is coaxially connected to a small gear, which engages an intermediate gear, which engages an output gear, which is sleeved on an output shaft, and the two ends of the output shaft respectively pass through output holes on the left and right sides of the housing, characterized in that: The output shaft and the output hole are sealed by a floating ring oil seal structure.
2. The oil-leakage-proof agricultural machinery mid-mounted gearbox according to claim 1, characterized in that: The output shaft is divided into two half shafts, left and right. One end of the two half shafts located inside the shell is key-connected to the output gear, and one end of the two half shafts located outside the shell is connected to the knife shaft connecting plate. The half shafts and the knife shaft connecting plate are made in one piece.
3. The oil-leakage-proof agricultural machinery mid-mounted gearbox according to claim 2, characterized in that: The floating ring oil seal structure includes: floating seal ring 1 and floating seal ring 2 which are sleeved on the outer circumference of the output shaft, ring recess 1 formed by the depression in the hole wall at the outer end of the output hole, ring recess 2 on the inner wall of the convex ring on the inner side of the cutter shaft connecting plate, and two rubber rings padded between ring recess 1 and floating seal ring 1 and between ring recess 2 and floating seal ring 2; the outer port diameter of ring recess 1 is large and the inner port diameter is small, while the inner port diameter of ring recess 2 is large and the outer port diameter is small.
4. The oil-leakage-proof agricultural machinery mid-mounted gearbox according to claim 3, characterized in that: The inner end of the annular protrusion continues to extend toward the outer shell to form an inserting ring. The outer end surface of the output port is provided with an annular slot, and the inserting ring is located in the annular slot.
5. The oil-leakage-proof mid-mounted gearbox for agricultural machinery according to claim 2, characterized in that: The half shaft is rotatably connected to the output hole through a bearing. An annular groove is provided on the inner side of the bearing, and a retaining ring is provided in the annular groove to prevent the half shaft from falling out.