Camshaft gear end support device for improving camshaft load-bearing capacity

Abstract

The present invention discloses a camshaft gear end support device for improving the load-bearing capacity of a camshaft, comprising a camshaft mounted on a machine body, a camshaft gear mounted on the camshaft, a ring platform extending outward in the axial direction and coaxially arranged with the camshaft on the end face of the camshaft gear, a ring platform inner cavity provided on the ring platform, a mounting hole provided on a gear chamber cover, a camshaft gear end support member for providing support for the camshaft gear on the mounting hole, the camshaft gear end support member comprising a cover plate mounted corresponding to the mounting hole, a cover plate shaft extending inward in the axial direction and corresponding to the ring platform inner cavity provided on the inner end face of the cover plate, the outer diameter of the cover plate shaft being smaller than the inner diameter of the ring platform inner cavity, and a camshaft gear bushing provided between the outer peripheral wall of the cover plate shaft and the inner peripheral wall of the ring platform inner cavity. The present invention utilizes double supports to decompose the radial force of the camshaft gear, reduces the occurrence of camshaft shaft seizure failure, and improves the reliability of the engine.

Description

Technical Field

[0001] The invention relates to a camshaft gear end supporting device for improving the load-bearing capacity of the camshaft. Background Art

[0002] In off-road machinery matching applications, camshaft drive gears are often used as drive gears for power outputs such as hydraulic pumps, while general camshaft drive gears are cantilever structures supported on one side. With the increasing number of off-road machinery functions, this is mainly reflected in the increase in the number of accessories carried. The driving power of the accompanying hydraulic pump is getting higher and higher, which is mainly reflected in the multi-functions such as returning the field, deep plowing, and crushing. As a result, the load on the cantilever-supported single-sided camshaft bushing is increasing, which aggravates the wear of the single-sided camshaft bushing. For this reason, it is necessary to seek a reasonable solution to improve this problem. The existing structural design is that the camshaft is installed on the body, and the camshaft gear is directly installed on the front end of the camshaft. The camshaft gear is a cantilever structure. When the loading force of the accessories driven by the camshaft gear exceeds the ultimate load-bearing capacity of the camshaft bushing, there is a risk of the camshaft seizing due to insufficient oil film thickness of the camshaft bushing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a camshaft gear end support device which improves the load-bearing capacity of the camshaft, utilizes double supports to decompose the radial force of the camshaft gear, reduces the occurrence of camshaft seizure failure, and improves the reliability of the engine.

[0004] In order to solve the above technical problems, the present invention includes a camshaft installed on a body, the camshaft is equipped with a camshaft gear, the camshaft gear is arranged in a gear chamber, and a gear chamber cover is provided on the gear chamber, characterized in that an annular platform extending outward in an axial direction and coaxially arranged with the camshaft is provided on the end face of the camshaft gear, an annular platform inner cavity coaxially arranged with the camshaft is provided in the annular platform, an axially through-going mounting hole corresponding to the annular platform is provided on the gear chamber cover, a camshaft gear end support member providing support for the camshaft gear is installed on the mounting hole, and the camshaft gear end support member includes a cover plate installed corresponding to the mounting hole, a cover plate shaft extending inward in an axial direction and corresponding to the annular platform inner cavity is provided on the inner end face of the cover plate, an axial hole is provided on the inner end of the cover plate, the outer diameter of the cover plate shaft is smaller than the inner diameter of the annular platform inner cavity, and a camshaft gear bushing is provided between the outer peripheral wall of the cover plate shaft and the inner peripheral wall of the annular platform inner cavity.

[0005] After adopting the above structure, a cover shaft corresponding to the camshaft gear bushing is provided on the camshaft gear end support member, and the cover shaft can be installed in cooperation with the camshaft gear bushing. The fixed position of the camshaft gear end support member enables the cover shaft to support the ring platform, and the cooperation of the ring platform and the cover shaft can support the outer side of the camshaft gear. The camshaft gear is installed on the camshaft and the ring platform and the cover shaft are provided on the outer end face of the camshaft gear. The cooperation can provide support for the double-sided force of the camshaft gear, thereby realizing that both sides of the camshaft gear are subjected to force at the same time, solving the cantilever structure of the original camshaft. When the cam When the wheel axle drives the peripheral accessories, the reaction force of the accessories transmits the radial force to the camshaft gear bushing and the camshaft bushing through the camshaft gear. This can greatly reduce the radial force on the camshaft bushing, thereby ensuring the reliability of the camshaft bushing. The camshaft gear bushing is used to bear the torque to avoid the radial force directly acting on the camshaft bushing, thereby reducing the occurrence of camshaft seizure caused by insufficient oil film thickness due to excessive bearing capacity of the camshaft bushing. The camshaft gear is subjected to force on both sides at the same time and the torque is transmitted to the camshaft gear end support. The above structure uses double supports to decompose the radial force of the camshaft gear.

[0006] As an improved technical solution, an oil filling hole is provided on the cover plate shaft, the oil inlet of the oil filling hole is located on the outer end surface of the cover plate, and the oil outlet of the oil filling hole is provided on the outer side wall of the cover plate shaft.

[0007] After adopting the above structure, the lubricating oil injected from the outside is sent into the space between the cover plate shaft and the camshaft gear bushing through the oil injection hole to achieve the effect of lubricating the cover plate shaft and the camshaft gear bushing.

[0008] As an improved technical solution, the outer contour of the camshaft gear end support is annular, the outer end of the cover plate serves as a positioning platform placed on the outer wall of the gear chamber cover, and a mounting platform extending into the mounting hole is provided from the inner end surface of the cover plate. The cover plate shaft is located at the inner end of the positioning platform, the outer diameter of the mounting platform is adapted to the inner diameter of the mounting hole, the outer diameter of the positioning platform is larger than the inner diameter of the mounting hole, the outer diameter of the cover plate shaft is smaller than the outer diameter of the mounting platform, and the positioning platform is fixedly connected to the gear chamber cover.

[0009] After adopting the above structure, the coordinated installation of the mounting platform and the mounting hole can increase the stability of the cover plate, the positioning platform can limit the length of the mounting platform entering the gear chamber cover, and the fixed connection between the positioning platform and the gear chamber cover can realize the fixation of the position of the camshaft gear end support. The stability of the camshaft gear end support can make the installation of the cover plate shaft more stable.

[0010] As an improved technical solution, a bolt hole is opened on the gear chamber cover, the bolt hole ring mounting hole is set, the positioning platform is provided with a positioning through hole corresponding to the bolt hole, and the positioning through hole is provided with a fixing bolt for fixing the camshaft gear end support on the gear chamber cover.

[0011] After adopting the above structure, the fixing bolt passes through the positioning through hole and is threadedly connected with the bolt hole to fix the positioning platform on the gear chamber cover. The fixing of the positioning platform is also the fixing of the camshaft gear end support. The fixing of the camshaft gear end support can provide support for the outer side of the camshaft gear.

[0012] As an improved technical solution, the outer wall of the camshaft gear bushing and the inner wall of the ring platform inner cavity are installed by interference fit.

[0013] After adopting the above structure, the interference fit can enable the camshaft gear bushing to be tightly installed in the inner cavity of the ring table, thereby reducing the wear of the inner wall of the inner cavity of the ring table.

[0014] As an improved technical solution, the outer wall of the cover plate shaft and the inner wall of the camshaft gear bushing are installed with clearance fit.

[0015] After adopting the above structure, the clearance fit can enable the cover plate shaft to provide support for the rotation of the camshaft gear bushing, thereby reducing the wear of the inner wall of the ring table inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure of the camshaft gear end support;

[0019] Figure 3 yes Figure 2 Structural schematic diagram of AA direction;

[0020] Figure 4 yes Figure 2 Schematic diagram of the top view structure.

[0021] In the figure: 1-camshaft, 11-pressure plate, 12-pressure plate bolt, 2-camshaft gear, 21-ring platform, 22-ring platform inner cavity, 23-camshaft gear bushing, 3-gear chamber, 4-gear chamber cover, 5-camshaft gear end support, 51-mounting table, 52-positioning table, 53-positioning through hole, 54-cover plate shaft, 55-shaft hole, 56-oil filling hole. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the design concept of the present invention and the specific implementation methods based on the design concept, it is necessary to make a brief introduction to the existing camshaft 1 installation before describing the specific implementation methods of the present invention. The existing structural design is that the camshaft 1 is installed on the body, and the camshaft gear 2 is directly installed at the front end of the camshaft 1. The camshaft gear 2 is a cantilever structure. When the accessory loading force driven by the camshaft gear 2 exceeds the ultimate bearing capacity of the camshaft 1 bushing, the accessory here is the gear of the hydraulic pump. There is a risk of camshaft 1 seizure due to insufficient oil film thickness of the camshaft 1 bushing.

[0023] For the above technical problems, for the convenience of description, refer to Figure 1 As shown, with the camshaft 1 as the reference, the direction close to the camshaft 1 is the inside, and the direction away from the camshaft 1 is the outside. Figure 1-4 As shown, the camshaft gear end support device for improving the camshaft load-bearing capacity includes a camshaft 1 installed on a body, the outer end of the camshaft 1 is installed with a camshaft gear 2 through a pressure plate 11 and a pressure plate bolt 12, the camshaft gear 2 is arranged in a gear chamber 3, and a gear chamber cover 4 is provided on the gear chamber 3. The above-mentioned structures and positional relationships are all prior arts and are well known to technicians in this technical field, and will not be elaborated here. An outwardly extending ring platform 21 is provided on the outer end surface of the camshaft gear 2. The ring platform 21 is integrally formed with the camshaft gear 2. An inner ring platform cavity 22 extending toward the camshaft gear 2 body is provided along the end of the ring platform 21. The inner ring platform cavity 22 is coaxially arranged with the camshaft 1. The outer diameter of the pressure plate 11 is smaller than the inner diameter of the inner ring platform cavity 22. The inner end surface of the inner ring platform cavity 22 is flush with the outer end surface of the camshaft 1 outside the ring platform 21. The pressure plate 11 is fixed to the inner end surface of the inner ring platform cavity 22 by the pressure plate bolt 12, so that the camshaft gear 2 is installed on the camshaft 1. A camshaft gear bushing 23 is provided in the inner ring platform cavity 22. An axial through hole is provided on the gear chamber cover 4. A mounting hole is provided through the ring stage 21 and corresponds to the ring stage 21. The mounting hole is coaxial with the ring stage 2. A camshaft gear end support 5 is provided on the mounting hole to provide support for the camshaft gear 2. The camshaft gear end support 5 includes a cover plate installed corresponding to the mounting hole. A cover plate shaft 54 ​​is provided on the inner end surface of the cover plate and extends inwardly in the axial direction and corresponds to the inner cavity 22 of the ring stage. An axial hole 55 is provided at the inner end of the cover plate shaft 54. The axial hole 55 is a blind hole for accommodating the pressure plate bolt 12. The outer diameter of the cover plate shaft 54 ​​is smaller than the inner diameter of the inner cavity 22 of the ring stage, and a camshaft gear bushing 23 is provided between the outer peripheral wall of the cover plate shaft 54 ​​and the inner peripheral wall of the inner cavity 22 of the ring stage. Figure 3The outer contour of the camshaft gear end support 5 is annular, and the outer end of the cover plate is used as a positioning platform 52 placed on the outer wall of the gear chamber cover 4. A mounting platform 51 extending into the mounting hole is provided from the inner end surface of the cover plate, and the cover plate shaft 54 ​​is located at the inner end of the positioning platform 52. The outer diameter of the mounting platform 51 is adapted to the inner diameter of the mounting hole. The outer diameter of the positioning platform 52 is larger than the inner diameter of the mounting hole, and the outer diameter of the cover plate shaft 54 ​​is smaller than the outer diameter of the mounting platform 51. The axial length of the cover plate shaft 54 ​​is less than or equal to the axial length of the annular platform 21. The positioning platform 52 is fixedly connected to the gear chamber cover 4. Bolt holes are provided on the gear chamber cover 4, and the bolt holes are arranged around the mounting holes. The positioning platform 52 is provided with positioning through holes 53 corresponding to the bolt holes, and the positioning through holes 53 are provided with fixing bolts for fixing the camshaft gear end support 5 on the gear chamber cover 4. The stability of the cover plate can be increased by the installation of the mounting platform 51 and the mounting hole, the positioning platform 52 can limit the length of the mounting platform entering the gear chamber cover, the positioning platform 52 is fixedly connected to the gear chamber cover 4 to fix the position of the camshaft gear end support, and the stability of the camshaft gear end support can make the installation of the cover plate shaft more stable. The cooperation of the ring platform 21 and the cover plate shaft 54 ​​can provide support for the outer radial force of the camshaft gear 2. An oil injection hole 56 is provided on the cover plate shaft 54, the oil inlet of the oil injection hole 56 is located on the outer end surface of the cover plate, and the oil outlet of the oil injection hole 56 is provided on the outer wall of the cover plate shaft 54. The oil injection hole 56 is connected to the body oil injection device through a pipeline, so that the oil injection device injects lubricating oil into the oil injection hole, the axis of the oil inlet is perpendicular to the axis of the oil outlet, and the lubricating oil injected from the outside is sent to the cover plate shaft 54 ​​and the camshaft gear bushing 23 through the oil injection hole 56 to achieve the effect of lubricating the cover plate shaft 54 ​​and the camshaft gear bushing 23.

[0024] The essence of the present invention is that a ring platform 21 is arranged on the outer end face of the existing camshaft gear 2, and a camshaft gear end support 5 is correspondingly arranged on the gear chamber cover 4. The camshaft gear end support 5 serves as the outer end support shaft of the camshaft gear 2, that is, the camshaft gear 2 is supported by the camshaft 1 and the camshaft gear end support 5, thereby decomposing the radial force of the camshaft gear and improving its ultimate bearing capacity.

[0025] When the present invention is in use, the camshaft gear 2 is first installed on the camshaft 1 by using the pressure plate 11 and the pressure plate bolt 12. A ring platform 21 is provided on the outer end surface of the camshaft gear 2, and the ring platform 21 is provided with a ring platform inner cavity 22. The pressure plate 11 and the pressure plate bolt 12 are both arranged in the ring platform inner cavity 22. The camshaft gear end support 5 is installed correspondingly at the installation hole. The cover plate shaft 54 ​​extending inwardly on the camshaft gear end support 5 is installed correspondingly to the ring platform inner cavity 22. The camshaft gear bushing 23 is arranged between the outer peripheral wall of the cover plate shaft 54 ​​and the inner peripheral wall of the ring platform inner cavity 22. The camshaft gear 2 is installed on the camshaft 1 and the cooperation of the ring platform 21 on the outer end surface of the camshaft gear 2 and the cover plate shaft 54 ​​can provide support for the forces on both sides of the camshaft gear 2. The support is provided to realize that both sides of the camshaft gear 2 are subjected to force at the same time, thereby solving the cantilever structure of the original camshaft 1. The oil filling hole 56 of the camshaft gear end support 5 can deliver lubricating oil into the space between the camshaft gear bushing 23 and the cover shaft 54 ​​for lubrication. When the camshaft 1 drives the peripheral accessories, the reaction force of the accessories transmits the radial force to the camshaft gear bushing 23 and the camshaft 1 bushing through the camshaft gear 2, which can greatly reduce the radial force on the camshaft 1 bushing, thereby ensuring the reliability of the camshaft 1 bushing. The camshaft gear bushing 23 is used to bear the torque to avoid the radial force being directly applied to the camshaft 1 bushing, thereby reducing the occurrence of camshaft 1 seizure failures caused by insufficient oil film thickness due to excessive bearing capacity of the camshaft 1 bushing.

Claims

1. A camshaft gear end support device for improving the load-bearing capacity of a camshaft, comprising a camshaft (1) mounted on a machine body, the camshaft (1) being mounted with a camshaft gear (2), the camshaft gear (2) being arranged in a gear chamber (3), the gear chamber (3) being provided with a gear chamber cover (4), characterized in that The end surface of the camshaft gear (2) is provided with a ring platform (21) extending outward in the axial direction and arranged coaxially with the camshaft (1); the ring platform (21) is provided with a ring platform inner cavity (22) arranged coaxially with the camshaft (1); the gear chamber cover (4) is provided with an axially penetrating mounting hole corresponding to the ring platform (21); the mounting hole is provided with a camshaft gear end support member (5) for providing support for the camshaft gear (2); the camshaft gear end support member (5) comprises a cover plate installed corresponding to the mounting hole; the inner end surface of the cover plate is provided with a cover plate shaft (54) extending inward in the axial direction and corresponding to the ring platform inner cavity (22); the inner end of the cover plate shaft (54) is provided with an axial hole (55); the outer diameter of the cover plate shaft (54) is smaller than the inner diameter of the ring platform inner cavity (22); and a camshaft gear bushing (23) is provided between the outer peripheral wall of the cover plate shaft (54) and the inner peripheral wall of the ring platform inner cavity (22); the camshaft gear end support The outer contour of the component (5) is in the shape of a ring platform. The outer end of the cover plate is used as a positioning platform (52) for being placed on the outer wall of the gear chamber cover (4). A mounting platform (51) extending into the mounting hole is provided from the inner end surface of the cover plate. The cover plate shaft (54) is located at the inner end of the positioning platform (52). The outer diameter of the mounting platform (51) is adapted to the inner diameter of the mounting hole. The outer diameter of the positioning platform (52) is larger than the inner diameter of the mounting hole. The outer diameter of the cover plate shaft (54) is smaller than the outer diameter of the mounting platform (51). The positioning platform (52) is fixedly connected to the gear chamber cover (4). The gear chamber cover (4) is provided with a bolt hole, the bolt hole is arranged around the mounting hole. The positioning platform (52) is provided with a positioning through hole (53) arranged corresponding to the bolt hole. A fixing bolt for fixing the camshaft gear end support component (5) on the gear chamber cover (4) is provided in the positioning through hole (53). The outer wall of the camshaft gear bushing (23) and the inner wall of the ring platform inner cavity (22) are installed by interference fit.

2. The camshaft gear end support device for improving the camshaft load-bearing capacity according to claim 1, characterized in that An oil filling hole (56) is provided on the cover plate shaft (54), an oil inlet of the oil filling hole (56) is located on the outer end surface of the cover plate, and an oil outlet of the oil filling hole (56) is provided on the outer side wall of the cover plate shaft (54).

3. The camshaft gear end support device for improving the camshaft load-bearing capacity as claimed in claim 1, characterized in that The outer wall of the cover plate shaft (54) and the inner wall of the camshaft gear bushing (23) are installed with clearance fit.

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