A cutting gear box and an equidistant profile shaft transmission protection device

Abstract

The present invention belongs to the technical field of power cutting heads, and specifically is a cutting gearbox and an equidistant profile shaft transmission protection device. A lubricating oil passage connected to a low-speed housing is provided on the small bevel gear, a radial hole connected to the lubricating oil passage is provided on the profile shaft, the radial hole is connected to the contact surface of the profile shaft and the small bevel gear, an oil groove I is provided between the inner side of the top end of the small bevel gear and the profile shaft, a reverse oil seal is provided on the upper side of the oil groove I, an oil groove II is provided between the outer side of the upper end of the small bevel gear and the reduction box housing, an oil seal is provided at the bottom of the oil groove II, and the oil seal is between the outer side of the small bevel gear and the inner side of the reduction box housing. The present invention aims at the wear failure and fracture of the triangular profile shaft connecting section of the transmission shaft, and by providing a reverse seal in a limited space, the oil film torque transmission under the oil storage lubrication of the profile shaft is realized, the wear of the profile shaft hole is reduced, and the service life is extended.

Description

Technical Field

[0001] The invention belongs to the technical field of power cutting heads, in particular to a cutting gear box and an equidistant profile shaft transmission protection device. Background Art

[0002] The equidistant profile shaft transmission is applied to the power cutting head, specifically a triangular equidistant profile shaft that transmits large torque, which is longitudinally arranged in the high and low speed housing connection section of the cutting reducer. Among them, the triangular profile shaft section of the equidistant profile shaft cooperates with the inner profile hole of the small bevel gear, and the other end is splined. Due to the influence of the distribution of the cutting teeth of the outer drum of the power cutting head, the lateral dimension of the connection section of the high and low speed housing cannot be too large, so the connection structure is compact and the profile shaft has the characteristics of large torque transmission. In actual use, the profile shaft holes are used to transmit heavy-load torque through the dynamic pressure lubricating oil film. Specifically, there are the following problems: (1) Due to the lack of effective lubrication between the profile shaft holes, the profile transmission is often in dry friction operation without oil film, which is very prone to wear failure and fatigue fracture; (2) The profile shaft runs through the high and low speed housing, and has the characteristics of large longitudinal dimension and insufficient rigidity. Under the action of heavy-load torque transmission, the slender shaft is very likely to bend and deform, resulting in asynchronous torque transmission between the spline connection section and the profile shaft hole connection section, which aggravates the wear of the spline and the profile shaft hole. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a cutting gear box and an equidistant profile shaft transmission protection device.

[0004] The present invention adopts the following technical scheme: a cutting gearbox and an equidistant profile shaft transmission protection device, comprising a reduction box housing, the upper part of the reduction box housing is a high-speed housing, the interior of the reduction box housing is a low-speed housing, a main shaft is arranged in the low-speed housing, the end of the main shaft is meshed with a small bevel gear, the small bevel gear is sleeved on the lower end of the profile shaft, the middle part of the bevel gear is fixed on a bearing II, the bearing II is mounted on an end cover fixed to the interior of the reducer housing, the outer side of the upper part of the small bevel gear is mounted on the reduction box housing through a bearing I, the upper part of the small bevel gear is sleeved on the lower end of the small face shaft, the outer side of the small face shaft is sleeved with a shaft sleeve, and the upper end of the profile shaft is provided with a It is arranged in the high-speed case body and connected with the gear speed change structure arranged in the high-speed case body, and the gear speed change structure is connected with the power input structure; the small bevel gear is provided with a lubricating oil channel connected with the low-speed case body, and the profile shaft is provided with a radial hole connected with the lubricating oil channel, and the radial hole is connected with the contact surface of the profile shaft and the small bevel gear, an oil groove I is arranged between the inner side of the top end of the small bevel gear and the profile shaft, a reverse oil seal is arranged on the upper side of the oil groove I, an oil groove II is arranged between the outer side of the upper end of the small bevel gear and the reduction box housing, an oil seal is arranged at the bottom of the oil groove II, and the oil seal is between the outer side of the small bevel gear and the inner side of the reduction box housing.

[0005] Furthermore, there are three groups of radial holes evenly distributed at 120° along the radial direction of the profile axis.

[0006] Furthermore, the splines of the profile shaft adopt drum-shaped teeth.

[0007] Furthermore, the surface of the profile shaft is nitrided.

[0008] Compared with the prior art, the present invention aims at the wear failure and fracture of the triangular profile shaft connecting section of the transmission shaft. By arranging a reverse seal in a limited space, the oil film torque transmission under the oil storage lubrication of the profile shaft is realized, the wear of the profile shaft hole is reduced, and the service life is extended. Specifically, the lubricating oil of the reducer low-speed case enters the profile hole through the bevel gear oil channel, and then is fully lubricated through the oil holes evenly distributed at 120° along the radial direction of the profile shaft. The arrangement of the reverse seal is conducive to the formation of oil storage lubrication between the profile shaft holes, thereby preventing the lubricating oil from flowing into the spline shaft and the sleeve under the different high and low cutting postures of the cutting reducer, thereby failing to play a lubricating role. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a front view of the structure of the present invention;

[0010] Figure 2 It is a structural diagram of the lubricating oil passage of the present invention;

[0011] Figure 3 It is a schematic diagram of the profile shaft structure;

[0012] Figure 4 for Figure 3 Medium AA view;

[0013] Figure 5 for Figure 3 Middle K-direction view;

[0014] In the figure, 1-main shaft, 2-small bevel gear, 3-profile shaft, 4-bearing I, 5-bearing II, 6-end cover, 7-lubricating oil channel, 8-radial hole, 9-oil seal, 10-reverse oil seal, 11-shaft sleeve, 12-reduction gearbox housing, 13-high speed housing, 14-low speed housing, 15-oil groove II, 16-oil groove I. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] like Figure 1-2As shown, a cutting gearbox equidistant profile shaft transmission protection device includes a reduction box housing 12, the upper part of the reduction box housing 12 is a high-speed housing 13, the interior of the reduction box housing 12 is a low-speed housing 14, a main shaft 1 is arranged in the low-speed housing 14, the end of the main shaft 1 is meshed with a small bevel gear 2, the small bevel gear 2 is sleeved on the lower end of the profile shaft 3, the middle part of the bevel gear 2 is fixed on the bearing II5, the bearing II5 is installed on the end cover 6 fixed to the interior of the reduction box housing 12, the outer side of the upper part of the small bevel gear 2 is installed on the reduction box housing 12 through the bearing I4, the upper part of the small bevel gear 2 is sleeved on the lower end of the small face shaft 3, the outer side of the small face shaft 3 is sleeved with a shaft sleeve 11, and the upper end of the profile shaft 3 is arranged in the high-speed housing. 13, and is connected to the gear speed change structure arranged in the high-speed case 13, and the gear speed change structure is connected to the power input structure; the small bevel gear 2 is provided with a lubricating oil channel 7 connected to the low-speed case 12, and the profile shaft 3 is provided with a radial hole 8 connected to the lubricating oil channel 7, the radial hole 8 is connected to the contact surface of the profile shaft 3 and the small bevel gear 2, an oil groove I16 is provided between the inner side of the top end of the small bevel gear 2 and the profile shaft 3, a reverse oil seal 10 is provided on the upper side of the oil groove I16, an oil groove II15 is provided between the outer side of the upper end of the small bevel gear 2 and the reduction box housing 12, an oil seal 9 is provided at the bottom of the oil groove II15, and the oil seal 9 is between the outer side of the small bevel gear 2 and the inner side of the reduction box housing 12.

[0017] The present application realizes oil film torque transmission under oil storage lubrication of the profile shaft 3 by arranging an oil seal 9 and a reverse oil seal 10 in a limited space. Specifically, the lubricating oil of the reducer low-speed housing 12 enters the radial hole 8 through the lubricating oil channel 7, and then is fully lubricated through the oil holes uniformly distributed along the radial direction of the profile shaft 3. Among them, the arrangement of the oil seal 9 and the reverse oil seal 10 is conducive to the formation of oil storage lubrication between the profile shaft holes, and avoids the lubricating oil flowing into the profile shaft 3 and the sleeve 11 under the different high and low cutting postures of the reducer, thereby failing to play a lubricating role. Under the premise of meeting the structural strength design requirements, the oil seal 9 and the reverse oil seal 10 realize the oil storage lubrication between the profile shaft holes, ensure the formation of dynamic pressure lubricating oil film, avoid dry friction operation, and realize long-life transmission.

[0018] There are three groups of radial holes 8 evenly distributed along the radial direction of the profile axis at 120°. Multiple groups of radial holes 8 can achieve full lubrication between the profile axis holes and improve lubrication performance.

[0019] The spline of the profile shaft 3 adopts drum-shaped teeth. In view of the problem of asynchronous torque transmission and aggravated wear caused by the flexural deformation caused by the large longitudinal dimension of the profile shaft and insufficient rigidity, the drum-shaped spline can be used to adapt to the flexural deformation, form a floating connection, and play a load-balancing role for the spline connection and the profile connection, effectively reducing wear and extending the service life. On the premise of meeting the connection strength, the profile shaft 3 of the drum-shaped teeth improves the adaptability to the flexural deformation of the profile shaft 3 under the heavy load torque transmission and plays a floating load-balancing role.

[0020] The surface of profile shaft 3 is nitrided to enhance wear resistance, and the seal matching shaft diameter section is nitrided and then polished to further reduce the seal friction resistance and extend the service life of the seal.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cutting gear box and an equidistant profile shaft transmission protection device, characterized in that: The invention comprises a reduction box housing (12), the upper part of which is a high-speed housing (13), the interior of which is a low-speed housing (14), a main shaft (1) being arranged in the low-speed housing (14), the end of which is meshed with a small bevel gear (2), the small bevel gear (2) being sleeved on the lower end of a profile shaft (3), the middle part of the bevel gear (2) being fixed on a bearing II (5), the bearing II (5) being mounted on an end cover (6) fixed to the interior of the reduction box housing (12), the outer side of the upper part of the small bevel gear (2) being mounted on the reduction box housing (12) via a bearing I (4), the upper part of the small bevel gear (2) being sleeved on the lower end of a small profile shaft (3), the outer side of the small profile shaft (3) being sleeved with a shaft sleeve (11), the upper end of the profile shaft (3) being arranged in the high-speed housing (13) and being engaged with a shaft sleeve (11) arranged on the lower end of a small profile shaft (3). The gear speed change structure in the high-speed housing (13) is connected, and the gear speed change structure is connected to the power input structure; the small bevel gear (2) is provided with a lubricating oil passage (7) connected to the low-speed housing (12); the profile shaft (3) is provided with a radial hole (8) connected to the lubricating oil passage (7); the radial hole (8) is connected to the contact surface between the profile shaft (3) and the small bevel gear (2); an oil groove I (16) is provided between the inner side of the top end of the small bevel gear (2) and the profile shaft (3); a reverse oil seal (10) is provided on the upper side of the oil groove I (16); an oil groove II (15) is provided between the outer side of the upper end of the small bevel gear (2) and the reduction box housing (12); an oil seal (9) is provided at the bottom of the oil groove II (15); the oil seal (9) is located between the outer side of the small bevel gear (2) and the inner side of the reduction box housing (12); The splines of the profile shaft (3) are drum-shaped teeth.

2. The cutting gear box and equidistant profile shaft transmission protection device according to claim 1, characterized in that: The radial holes (8) are evenly distributed in three groups at 120° along the radial direction of the profile axis.

3. The cutting gear box and equidistant profile shaft transmission protection device according to claim 1, characterized in that: The surface of the profile shaft (3) is nitrided.

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