An improved gearbox for agricultural machinery

Abstract

The invention discloses an improved gearbox for agricultural machinery, comprising a housing, an input shaft, a large gear, an output shaft, a small gear, a first bevel gear, a fan shaft, a second bevel gear, and a heat dissipation fan, wherein the fan shaft is installed in a guide support sleeve through two third bearings; the characteristics are as follows: an airflow inlet channel is formed in the guide support sleeve (42), the heat dissipation fan (50) comprises a hub (51), a fan blade (52), a first guide ring (53), and a second guide ring (54), the inner circumference of the first guide ring is inclined relative to the axis of the fan shaft, and the inclination angle is a, and the inner circumference of the second guide ring is inclined relative to the axis of the fan shaft, and the inclination angle is b, a>b. The invention can realize efficient heat dissipation of heat generated by the rotation of all bearings and gears, reduce abnormalities / damages caused by thermal stress, and thus improve the running stability and service life of bearings, gears, and shafts.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery and gear boxes, and in particular to an improved gear box for agricultural machinery. Background Art

[0002] An existing gearbox for agricultural machinery includes a box body, an input shaft, a large gear, an output shaft, a small gear, a first bevel gear, a fan shaft, a second bevel gear, and a cooling fan. The large gear is installed on the input shaft, the small gear and the first bevel gear are installed on the output shaft, the cooling fan is installed on the outer end of the fan shaft, and the second bevel gear is installed on the inner end. The cooling fan is arranged on the outside of the box body, the large gear and the small gear are meshed for transmission, the first bevel gear and the second bevel gear are meshed for transmission, both ends of the input shaft are respectively installed on the box body through the second bearing, both ends of the output shaft are respectively installed on the box body through the second bearing, the fan shaft is installed in the guide support sleeve through the third bearing, and the guide support sleeve is installed in the mounting hole on the box body.

[0003] However, existing non-oil-cooled / dry-type gearboxes still have problems such as poor heat dissipation of high-speed rotating bearings and gears, possible abnormalities / damage due to thermal stress, and the need to further improve operating stability and service life. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an improved gearbox for agricultural machinery, which, through an improved design of the gearbox heat dissipation mechanism, can achieve effective / efficient heat dissipation of the heat generated by the rotation of all bearings and gears, reduce the abnormalities / damage caused by thermal stress, and thus improve the operating stability and service life of bearings and gears, input shafts / output shafts.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An improved gearbox for agricultural machinery comprises a box body, an input shaft, a large gear, an output shaft, a small gear, a first bevel gear, a fan shaft, a second bevel gear, and a cooling fan. The input shaft is provided with a large gear, the output shaft is provided with a small gear and a first bevel gear, the outer end of the fan shaft is provided with a cooling fan, the inner end is provided with a second bevel gear, the cooling fan is arranged outside the box body, the large gear and the small gear are meshed for transmission, the first bevel gear and the second bevel gear are meshed for transmission, the input shaft is arranged in parallel with the output shaft, the fan shaft is arranged vertically with the output shaft, the two ends of the input shaft are respectively installed on the box body through a first bearing, the two ends of the output shaft are respectively installed on the box body through a second bearing, the fan shaft is installed in a guide support sleeve through two third bearings, and the guide support sleeve is installed in the box body. The invention relates to a fan according to the present invention, wherein the fan has a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, and the first guide ring is provided with a second guide ring. The fan has a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring is provided with a first guide ring and a second guide ring, wherein the first guide ring and the second guide ring are ...

[0007] Furthermore, the inclination angle a=10°-35°, and the inclination angle b=1°-15°.

[0008] Furthermore, an arc-conical guide tube is arranged on the right end surface of the guide support sleeve, the arc-conical guide tube is arranged adjacent to the first guide ring, and the outer diameter of the arc-conical guide tube is greater than the outer diameter of the first guide ring.

[0009] Furthermore, a guide plate is arranged between the arc-conical guide tube and the right end face of the guide support sleeve, and multiple guide plates are distributed along the circumferential direction, and the outer diameter of the guide plate is less than or equal to the outer diameter of the arc-conical guide tube. A return hole is arranged at the bottom of the arc-conical guide tube, and the return hole is arranged adjacent to the right end face of the guide support sleeve. The airflow on the radially outer side of the guide plate can flow to the inner circumference of the arc-conical guide tube through the return hole.

[0010] Furthermore, the plurality of reflow holes are evenly distributed along the circumferential direction, and the coverage range of the reflow holes along the circumferential direction is greater than 90°.

[0011] Furthermore, an auxiliary impeller is installed on the fan shaft, and the auxiliary impeller is arranged between two third bearings. A through hole is opened on the guide support sleeve, and multiple through holes are distributed along the circumferential direction, and the axis of the through hole is inclined relative to the axis of the fan shaft.

[0012] Furthermore, a first auxiliary blade is provided on one side surface of the second bevel gear, and a plurality of first auxiliary blades are distributed along the circumferential direction. The first auxiliary blade is arranged adjacent to the third bearing, and the axial width of the first blade on the radial inner side of the first auxiliary blade is greater than the axial width of the second blade on the radial outer side, and the axial width of the first blade and the axial width of the second blade are smoothly transitioned through an arc-shaped transition section.

[0013] Furthermore, the inner circumferential surface of the first guide ring is provided with second auxiliary blades, and a plurality of second auxiliary blades are distributed along the circumferential direction.

[0014] Furthermore, the downstream end of the second auxiliary blade extends into the arc-conical guide cylinder, the upstream end of the second auxiliary blade is located on the left side of the upstream end of the first guide ring, and the second auxiliary blade also has an inclination angle a, a=10°-35°.

[0015] The improved gearbox for agricultural machinery of the present invention is designed with a first guide ring and a second guide ring. The first guide ring promotes airflow to flow into an airflow entry channel, and the second guide ring promotes airflow to flow toward the outer side of the box body, thereby facilitating airflow to flow in two main directions, improving the blowing efficiency of the cooling fan, thereby achieving effective / efficient heat dissipation of heat generated by rotation of all bearings and gears, reducing abnormalities / damages caused by thermal stress, thereby improving the operating stability and service life of bearings, gears, input shafts / output shafts.

[0016] The present invention can further promote the flow of air into the air flow entry channel through the design of the arc-conical guide tube, guide vanes, and return holes / return grooves, and can make the turbulent flow on the radially outer side of the arc-conical guide tube flow to the inner circumference of the arc-conical guide tube through the guide vanes and the return holes and then merge with the mainstream and flow into the air flow entry channel, thereby reducing the air volume loss of the cooling fan and improving the air supply / blowing efficiency.

[0017] The present invention designs the auxiliary impeller, the through hole, and the first auxiliary blade so that the airflow entering the channel flows along a preset path toward the second bevel gear and the inner cavity of the box on the outer peripheral side of the guide support sleeve, thereby further promoting the airflow to flow along the preset path, thereby further enhancing the flow volume and flow effect of the airflow flowing along the preset path.

[0018] The present invention can further promote the flow of air into the air flow entry channel through the design of the second auxiliary blade, thereby further reducing the air volume loss of the cooling fan and improving the air supply efficiency, thereby improving the operating stability and service life of the bearings and gears, and the input shaft / output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the improved gearbox used for agricultural machinery of the present invention;

[0020] Figure 2 It is a partial enlarged structural schematic diagram of the improved gear box used for agricultural machinery of the present invention;

[0021] Figure 3 It is a schematic diagram of the heat dissipation airflow path of the improved gear box used for agricultural machinery of the present invention.

[0022] In the figure: box body 10, fan air deflector 11, guide plate 12, heat dissipation ribs 13, heat dissipation holes 14, input shaft 20, large gear 21, first bearing 22, output shaft 30, small gear 31, first bevel gear 32, second bearing 33, fan shaft 40, second bevel gear 41, guide support sleeve 42, third bearing 43, auxiliary impeller 44, first auxiliary blade 45, through hole 46, arc cone guide tube 47, guide vane 48, return hole 49, cooling fan 50, wheel hub 51, fan blade 52, first guide ring 53, second guide ring 54, second auxiliary blade 55; air flow direction is "←, ↑". DETAILED DESCRIPTION

[0023] In order to make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described in detail in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present invention, which are only used to explain the present invention, not to limit the present invention. It should be noted that, for the convenience of description, only the parts / structures related to the present invention are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should be the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-3As shown, an improved gearbox for agricultural machinery includes a housing 10, an input shaft 20, a large gear 21, an output shaft 30, a small gear 31, a first bevel gear 32, a fan shaft 40, a second bevel gear 41, and a cooling fan 50. The large gear 21 is installed on the input shaft 20, the small gear 31 and the first bevel gear 32 are installed on the output shaft 30, the cooling fan 50 is installed on the outer end of the fan shaft 40, and the second bevel gear 41 is installed on the inner end. The cooling fan 50 is arranged on the outside of the housing 10, and other components are arranged on the inside of the housing 10. The large gear 21 is meshed with the small gear 31 for transmission, the first bevel gear 32 is meshed with the second bevel gear 41 for transmission, the input shaft 20 is arranged parallel to the output shaft 30, the fan shaft 40 is arranged perpendicular to the output shaft 30, both ends of the input shaft 20 are respectively installed on the housing 10 through the first bearing 22, both ends of the output shaft 30 are respectively installed on the housing 10 through the second bearing 33, and the fan shaft 40 is installed on the guide through two third bearings 43. The guide support sleeve 42 is installed in the mounting hole on the box body 10; it is characterized in that: an airflow inlet channel is formed in the guide support sleeve 42, one or more heat dissipation holes 14 are opened on the side wall of the box body 10 opposite to the guide support sleeve 42, the heat dissipation holes 14 are airflow outlet channels, and a filter or dustproof net is arranged on the heat dissipation holes 14. The cooling fan 50 includes a hub 51, a fan blade 52, a first guide ring 53, and a second guide ring 54. The plurality of fan blades 52 are distributed along the circumferential direction. On the outer peripheral side of the hub 51, the hub 51 is installed on the fan shaft 40, and the first guide ring 53 and the second guide ring 54 are connected to the multiple blades 52. The first guide ring 53 is arranged close to the hub 51, and the second guide ring 54 is arranged on the outer peripheral edge of the blade 52. The inner peripheral surface / outer peripheral surface of the first guide ring 53 is inclined relative to the axis of the fan shaft 40, and the inclination angle is a. The inner peripheral surface / outer peripheral surface of the second guide ring 54 is inclined relative to the axis of the fan shaft 40, and the inclination angle is b, a>b.

[0027] Further, the inclination angle a=10°-24°, preferably 15°-18°, and the inclination angle b=1°-10°, preferably 3°-6°.

[0028] The present invention adopts the design of the first guide ring 53 and the second guide ring 54. The first guide ring 53 promotes the airflow to flow into the airflow entrance channel, and the second guide ring 54 promotes the airflow to flow toward the outer side of the box body 10, thereby facilitating the airflow to flow in two main directions, improving the blowing efficiency of the cooling fan 50, thereby achieving effective / efficient heat dissipation of the heat generated by the rotation of all bearings and gears, reducing the abnormalities / damage caused by thermal stress, thereby improving the operating stability and service life of bearings and gears, and input shafts / output shafts.

[0029] Furthermore, an arc-conical guide tube 47 is provided on the right end surface of the guide support sleeve 42, and the arc-conical guide tube 47 is provided adjacent to the first guide ring 53, and the outer diameter of the arc-conical guide tube 47 is larger than the outer diameter of the first guide ring 53. The present invention can further promote the airflow to flow into the airflow inlet channel through the design of the arc-conical guide tube 47, thereby improving the blowing efficiency of the cooling fan 50.

[0030] A guide vane 48 is provided between the arc-cone guide tube 47 and the right end surface of the guide support sleeve 42. A plurality of guide vanes 48 are distributed in the circumferential direction, and the outer diameter of the guide vane 48 is less than or equal to the outer diameter of the arc-cone guide tube 47. A return hole 49 (or a return groove structure) is provided at the bottom of the arc-cone guide tube 47. The return hole 49 is provided adjacent to the right end surface of the guide support sleeve 42. The airflow on the radially outer side of the guide vane 48 can flow to the inner circumference of the arc-cone guide tube 47 through the return hole 49. The present invention can make the turbulent flow on the radially outer side of the arc-cone guide tube 47 flow to the inner circumference of the arc-cone guide tube 47 through the design of the guide vane 48 and the return hole 49 (or the return groove) and merge with the mainstream, and then flow into the channel, thereby reducing the air volume loss of the cooling fan 50 and improving the air supply efficiency.

[0031] The plurality of reflow holes 49 (or reflow grooves) are evenly distributed along the circumferential direction, and the coverage range of the reflow holes 49 along the circumferential direction is greater than 90°-180°.

[0032] Furthermore, an auxiliary impeller 44 is mounted on the fan shaft 40, and the auxiliary impeller 44 is disposed between the two third bearings 43. A through hole 46 is provided on the guide support sleeve 42, and a plurality of through holes 46 are distributed along the circumferential direction, and the axis of the through hole 46 is inclined relative to the axis of the fan shaft 40. The present invention, through the design of the auxiliary impeller 44 and the through hole 46, allows the airflow entering the channel to flow along a preset path toward the second bevel gear 41 and the inner cavity of the box body 10 on the outer peripheral side of the guide support sleeve 42, so as to further promote the airflow to flow along the preset path.

[0033] A first auxiliary blade 45 is disposed on one side of the second bevel gear 41. A plurality of first auxiliary blades 45 are distributed circumferentially. The first auxiliary blade 45 is disposed adjacent to the third bearing 43. The radially inner first blade axial width of the first auxiliary blade 45 is greater than the radially outer second blade axial width. The first blade axial width and the second blade axial width are smoothly transitioned through an arc-shaped transition section. The present invention, through the design of the first auxiliary blade 45, enables the airflow at the outlet of the guide support sleeve 42 to flow toward the inner cavity of the box body 10 along a preset path, so as to further enhance the flow volume and flow effect of the airflow flowing along the preset path.

[0034] Furthermore, the inner circumferential surface of the first guide ring 53 is provided with second auxiliary blades 55 , and a plurality of second auxiliary blades 55 are distributed along the circumferential direction.

[0035] The downstream end of the second auxiliary blade 55 extends into the arc-conical guide tube 47, and the upstream end of the second auxiliary blade 55 is located on the left side of the upstream end of the first guide ring 53, and the second auxiliary blade 55 also has an inclination angle a, a=10°-24°. The present invention can further promote the airflow to flow into the airflow inlet channel through the design of the second auxiliary blade 55, thereby further reducing the air volume loss of the heat dissipation fan 50 and improving the air supply efficiency.

[0036] The peripheral cover of the cooling fan 50 is provided with a fan guide cover 11, and the fan guide cover 11 is connected to the box body 10 through a plurality of guide plates 12. The outer side surface of the box body 10 is provided with heat dissipation ribs 13, and the plurality of heat dissipation ribs 13 are arranged opposite to / staggered with the plurality of guide plates 12. The heat dissipation ribs 13 extend along the length direction of the box body 10 and cross the input shaft 20 and the output shaft 30.

[0037] A filter screen / dust screen is arranged on the outer side of at least one bearing.

[0038] like Figure 3 As shown, arrows “←, ↑” indicate airflow paths / airflow directions. An improved gearbox for agricultural machinery of the present invention has the following airflow paths:

[0039] Path 1: cooling fan 50 → air flow entering channel → second bevel gear 41 → large gear 21 → cooling hole 14;

[0040] Path two: cooling fan 50 → guide plate 12 → cooling rib 13 .

[0041] The improved gearbox for agricultural machinery of the present invention is designed with a first guide ring 53 and a second guide ring 54. The first guide ring 53 promotes the airflow to flow into the airflow inlet channel, and the second guide ring 54 promotes the airflow to flow toward the outer side of the box body 10, thereby facilitating the airflow to flow in two main directions, improving the blowing efficiency of the cooling fan 50, thereby achieving effective / efficient heat dissipation of the heat generated by the rotation of all bearings and gears, reducing abnormalities / damages caused by thermal stress, thereby improving the operating stability and service life of bearings and gears, and input shafts / output shafts.

[0042] The present invention can further promote the flow of air into the air flow inlet channel through the design of the arc-conical guide tube 47, the guide vane 48, and the return hole 49 (or the return groove), and can make the turbulent flow on the radial outer side of the arc-conical guide tube 47 flow to the inner circumference of the arc-conical guide tube 47 through the guide vane 48 and the return hole 49 and merge with the mainstream and then flow into the air flow inlet channel, thereby reducing the air volume loss of the cooling fan 50 and improving the air supply / blowing efficiency.

[0043] The present invention designs the auxiliary impeller 44, the through hole 46, and the first auxiliary blade 45 so that the airflow entering the channel flows along a preset path toward the second bevel gear 41 and the inner cavity of the box body 10 on the outer peripheral side of the guide support sleeve 42, so as to further promote the airflow to flow along the preset path, so as to further enhance the flow volume and flow effect of the airflow flowing along the preset path.

[0044] The present invention can further promote the airflow to flow into the airflow inlet channel through the design of the second auxiliary blade 55, thereby further reducing the air volume loss of the cooling fan 50 and improving the air supply efficiency, thereby improving the operating stability and service life of the bearings and gears, and the input shaft / output shaft.

[0045] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An improved gearbox for agricultural machinery, comprising a housing (10), an input shaft (20), a large gear (21), an output shaft (30), a small gear (31), a first bevel gear (32), a fan shaft (40), a second bevel gear (41), and a cooling fan (50), wherein the large gear is mounted on the input shaft, the small gear and the first bevel gear are mounted on the output shaft, the cooling fan is mounted on the outer end of the fan shaft, and the second bevel gear is mounted on the inner end, the cooling fan is arranged outside the housing, the large gear and the small gear are meshed for transmission, the first bevel gear and the second bevel gear are meshed for transmission, the input shaft and the output shaft are arranged in parallel, the fan shaft and the output shaft are arranged perpendicularly, both ends of the input shaft are respectively mounted on the housing through first bearings (22), both ends of the output shaft are respectively mounted on the housing through second bearings (33), the fan shaft is mounted in a guide support sleeve (42) through two third bearings (43), and the guide support sleeve is mounted in a mounting hole on the housing; Features: An airflow inlet channel is formed in the guide support sleeve (42); one or more heat dissipation holes (14) are formed on a side wall of the box body opposite to the guide support sleeve; the heat dissipation holes are airflow outlet channels; a filter screen or a dust screen is arranged on the heat dissipation holes; the heat dissipation fan (50) comprises a hub (51), fan blades (52), a first guide ring (53), and a second guide ring (54); a plurality of fan blades are circumferentially distributed on the outer peripheral side of the hub; the hub is mounted on the fan shaft; a first guide ring and a second guide ring are connected to the plurality of fan blades; the first guide ring is arranged close to the hub; the second guide ring is arranged on the outer peripheral edge of the fan blade; the inner peripheral surface / outer peripheral surface of the first guide ring is arranged tilted relative to the axis of the fan shaft at an inclination angle of a; the inner peripheral surface / outer peripheral surface of the second guide ring is arranged tilted relative to the axis of the fan shaft at an inclination angle of b; a>b; The first guide ring (53) promotes the airflow to flow into the airflow inlet channel, and the second guide ring (54) promotes the airflow to flow toward the outer side of the box body (10); the right end surface of the guide support sleeve (42) is provided with an arc-conical guide tube (47), the arc-conical guide tube is arranged adjacent to the first guide ring, and the outer diameter of the arc-conical guide tube is greater than the outer diameter of the first guide ring (53).

2. An improved gearbox for agricultural machinery as claimed in claim 1, It is characterized in that Tilt angle a=10°-35°, tilt angle b=1°-15°.

3. An improved gearbox for agricultural machinery as claimed in claim 1 or 2, It is characterized in that A guide plate (48) is arranged between the arc-conical guide tube (47) and the right end surface of the guide support sleeve, the plurality of guide plates are distributed along the circumferential direction, and the outer diameter of the guide plate is less than or equal to the outer diameter of the arc-conical guide tube. A return hole (49) is arranged at the bottom of the arc-conical guide tube, and the return hole is arranged adjacent to the right end surface of the guide support sleeve (42). The airflow radially outside the guide plate can flow to the inner circumference of the arc-conical guide tube through the return hole.

4. An improved gearbox for agricultural machinery as claimed in claim 3, It is characterized in that The plurality of reflow holes (49) are evenly distributed along the circumferential direction, and the coverage range of the reflow holes along the circumferential direction is greater than 90°.

5. An improved gearbox for agricultural machinery as claimed in claim 4, It is characterized in that An auxiliary impeller (44) is mounted on the fan shaft (40), and the auxiliary impeller is arranged between two third bearings. A through hole (46) is provided on the flow guide support sleeve (42), and the plurality of through holes are distributed along the circumferential direction, and the axes of the through holes are arranged to be inclined relative to the axis of the fan shaft.

6. An improved gearbox for agricultural machinery as claimed in claim 5, It is characterized in that A first auxiliary blade (45) is provided on one side surface of the second bevel gear (41), the plurality of first auxiliary blades are distributed in the circumferential direction, the first auxiliary blades are provided adjacent to the third bearing (43), the axial width of the first blade on the radial inner side of the first auxiliary blade is greater than the axial width of the second blade on the radial outer side, and the axial width of the first blade and the axial width of the second blade are smoothly transitioned through an arc-shaped transition section.

7. An improved gearbox for agricultural machinery as claimed in claim 6, It is characterized in that The inner circumferential surface of the first guide ring (53) is provided with second auxiliary blades (55), and a plurality of second auxiliary blades are distributed along the circumferential direction.

8. An improved gearbox for agricultural machinery as claimed in claim 7, It is characterized in that The downstream end of the second auxiliary blade (55) extends into the arc-conical guide tube (47), the upstream end of the second auxiliary blade (55) is located on the left side of the upstream end of the first guide ring (53), and the second auxiliary blade also has an inclination angle a, a=10°-35°.

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