Modularized inert gear structure

Abstract

The utility model discloses a modular inert gear structure. The modular inert gear structure comprises a double-row tapered roller bearing and a gear shaft. The double-row tapered roller bearing is sleeved on the gear shaft; a lubricating oil way is formed in the gear shaft; the double-row tapered roller bearing comprises an inner side framework, an outer side framework and a plurality of tapered rollers, the tapered roller is arranged between the inner side framework and the outer side framework in a rolling manner; the inner side framework is matched with the gear shaft; at least two built-in oil ducts are formed in the inner side framework; and one end of the lubricating oil way is arranged over against the cross section of the built-in oil way. According to the structure, modularization of an idle gear transmission structure is achieved, the design and development difficulty is effectively reduced, limited space is well utilized, the idle gear transmission structure is more compact on an engine, the space utilization rate is higher, universality is good, and the size of outer teeth can be adjusted according to gear trains with different diameters. Installation is easy, and the axial clearance does not need to be independently controlled through additional means.

Description

Technical Field

[0001] This application relates to the technical field of idler gear transmission structures, and particularly to a modular idler gear structure. Background Art

[0002] The idler gear transmission structure is an essential transmission structure in engine gear transmission. Its strength and reliability determine the power that the gear can output during transmission and the usage scenarios. It plays an increasingly important role in the application scenarios where the engine power output is becoming more and more diverse.

[0003] During the design and development of the engine wheel transmission, the design of the idler gear transmission structure relies on a large amount of calculation work. From the relevant parameters of the gear to the layout of the lubrication and cooling pipeline structure, to the positioning and installation, and then to the axial control, all are determined based on the calculation results. The calculation and design process is complex, and the spatial layout is difficult. The strength and mating accuracy of the gear rely on long-term calculation work experience.

[0004] In the prior art, various forms have been proposed for the idler gear transmission structure. For example, the reverse idler gear transmission structure disclosed in CN201720770730.9. In this structure, the reverse idler gear can be inserted into the main box housing from the outside, which is convenient for assembly and maintenance. The stop screw is screwed into the groove of the reverse idler gear shaft through threads for positioning, with a simple structure and low cost.

[0005] However, the integration degree of this idler gear transmission structure is poor, and it cannot achieve good generalization of various structures. The lubrication pipeline needs to be set separately, increasing the complexity of the transmission structure, and the idler gear transmission structure cannot achieve modular assembly.

[0006] The present utility model can preferably solve the above difficulties. The information disclosed in the background art section is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as an admission or an implication in any form that this information constitutes the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0007] This application provides a modular idler gear structure for the above technical problems. This structure integrates an idler gear, a bearing, and a gear shaft. Only by adjusting the external tooth size of the idler gear can the generalization of various configurations be achieved. Moreover, the double-row tapered roller bearing has an internal oil lubrication structure and is built into the inner cavity structure of the gear, with extremely high space utilization rate, a compact structure, and stable and reliable power output.

[0008] This application provides a modular idler gear structure, including: a double-row tapered roller bearing, a gear shaft; the double-row tapered roller bearing is sleeved on the gear shaft; a lubricating oil path is opened in the gear shaft.

[0009] The double-row tapered roller bearing includes: an inner skeleton, an outer skeleton, and a plurality of tapered rollers; the tapered rollers are rotatably arranged between the inner skeleton and the outer skeleton; the inner skeleton is fitted and installed with the gear shaft; at least two built-in oil channels are opened on the inner skeleton; one end of the lubricating oil path is arranged opposite to the cross-section where the built-in oil channel is located.

[0010] Preferably, the inner skeleton includes: a first ring body and a second ring body; large fillet surfaces are arranged on the contact end surfaces of the first ring body and the second ring body; the built-in oil channels are arranged in the large fillet surfaces.

[0011] Preferably, the central angle of the large fillet surface is 150-180°.

[0012] Preferably, the lubricating oil path includes: a first section and a second section; the liquid inlet end of the first section is opened on the end surface of the gear shaft; the second end of the first section is communicated with the second section; the liquid outlet end of the second section is arranged opposite to the built-in oil channel.

[0013] Preferably, the gear shaft includes: a positioning pin structure; the positioning pin structure protrudes from the installation end surface of the gear shaft; the lubricating oil path is accommodated in the positioning pin structure.

[0014] Preferably, the gear shaft includes: a journal; the journal is in direct contact with the inner skeleton and is interference-fitted.

[0015] Preferably, it includes: a compression flange; an anti-detachment boss is arranged on the anti-detachment end surface of the inner cavity of the idler gear; the compression flange is detachably arranged on the other end surface of the idler gear through bolts.

[0016] Preferably, it includes: an idler gear; the idler gear is sleeved on the outer wall of the double-row tapered roller bearing.

[0017] Preferably, the built-in oil channels are symmetrically arranged on the inner side wall of the inner skeleton and penetrate through the inner skeleton.

[0018] Preferably, anti-detachment convex rings are respectively arranged on the outer side end surfaces of the first ring body and the second ring body; the tapered rollers are rotatably arranged in the anti-detachment convex rings.

[0019] The beneficial effects that this application can produce include:

[0020] 1) The modular idler gear structure provided by this application improves the structural compactness and processability of parts through the modularization and integration of the gear structure, bearing, and gear shaft. Separating the complex dimensional fits and precise transmission requirements into one structure reduces the processing difficulty of parts and improves the fitting accuracy. This structure realizes the modularization of the idler gear transmission structure, effectively reduces the design and development difficulty, makes good use of the limited space, makes it more compact on the engine, has higher space utilization rate, good versatility, and can adjust the external tooth dimensions according to different diameters of the gear train. The installation is simple and does not require additional means to control the axial clearance separately.

[0021] 2) The modular idler gear structure provided by this application, on the one hand, the idler gear transmission structure greatly improves the versatility of the gear structure, and this structure can be applied to different models and different gear systems. On the other hand, the setting of the built-in double-row tapered roller bearings improves the power output and reliability of the entire transmission structure. The large fillet structure of the bearing inner cavity skeleton is cleverly used as an oil groove, and the processing difficulty of the lubrication structure is very small. Description of the Drawings

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the idler gear transmission structure in at least one embodiment provided by this application;

[0023] Figure 2 It is a front view sectional structure schematic diagram of the idler gear transmission structure in at least one embodiment provided by this application;

[0024] Figure 3 It is a schematic diagram of the double-row tapered roller bearing structure of the idler gear transmission structure in at least one embodiment provided by this application; a) is a front view section; b) is a three-dimensional structure;

[0025] Figure 4 It is an internal structure assembly schematic diagram of the idler gear in at least one embodiment provided by this application;

[0026] Figure 5 It is a sectional assembly schematic diagram of the gear shaft in at least one embodiment provided by this application;

[0027] Figure 6 It is a front view sectional structure schematic diagram of the double-row tapered roller bearing in at least one embodiment provided by this application;

[0028] Figure 7 It is a top view of the inner side skeleton of the double-row tapered roller bearing and its corresponding A-A sectional schematic diagram in at least one embodiment provided by this application;

[0029] Legend Explanation:

[0030] Gear shaft 1, Lubricating oil path 2, Locating pin structure 3, Double-row tapered roller bearing 4, Outer side skeleton 5, Inner side skeleton 6, Built-in oil passage 7, Journal 8, Compression flange 9, External teeth 10, Inner cavity 11, Idler gear 12, First ring body 71, Second ring body 72, Large fillet surface 73. Detailed Description of the Invention

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0033] The technical means not detailed in this application and not used to solve the technical problems of this application are set according to the common general knowledge in the art, and various common general knowledge setting methods can be realized.

[0034] See Figures 1 to 7 , the modular idler gear structure provided by this application includes: a gear shaft 1, a lubricating oil passage 2, a positioning pin structure 3, a double-row tapered roller bearing 4, an outer cage 5 of the double-row tapered roller bearing, an inner cage 6 of the double-row tapered roller bearing 4, an internal oil passage 7 of the double-row tapered roller bearing 4, a journal 8 of the gear shaft 1, a compression flange 9 of the gear shaft 1, external teeth 10 of the idler gear 12, and an inner cavity 11 of the idler gear 12.

[0035] The double-row tapered roller bearing 4 is sleeved on the gear shaft 1; the gear shaft 1 serves as the support shaft of the double-row tapered roller bearing 4. A lubricating oil passage 2 is opened in the gear shaft 1, and the lubricating oil of the lubricating oil passage 2 can reach the oil passage 7 provided on the inner cage 6 of the double-row tapered roller bearing 4 to lubricate each roller in the double-row tapered roller bearing 4. The lubricating oil passage 2 includes: a first section and a second section; the first section and the second section are vertically arranged and communicate with each other; the first section is opened on the end face of the gear shaft 1 to facilitate connection with an external lubricating oil passage; the first section extends axially in the gear shaft 1 along the gear shaft 1, and one end of the second section is connected to the side wall of the first section and extends and communicates with the oil passage 7 on the inner cage 6. Thus, lubricating oil is conveyed to the double-row tapered roller bearing 4, and after passing through the oil passage 7 on the inner cage 6, the lubricating oil enters the area between the roller and the inner cage 6 to achieve effective lubrication of the roller.

[0036] The double-row tapered roller bearing 4 includes: an inner frame 6 and an outer frame 5 and a rotating tapered roller arranged between the inner frame 6 and the outer frame 5. The inner frame 6 includes: a first ring body 71 and a second ring body 72; large fillet surfaces are arranged on the contact end surfaces of the first ring body 71 and the second ring body 72; the arc segment surface center angle of the large fillet surface is 150-180°. Due to the large fillet surface structure, the contact end surfaces of the first ring body 71 and the second ring body 72 have a large gap between the contact end surfaces, which can store and form a lubricating oil film on the contact surface between the roller and the inner frame 6. The built-in oil channel 7 is opened in the gap between the contact end surfaces of the first ring body 71 and the second ring body 72. The oil entering the gap of the large fillet surface can pass through the built-in oil channel 7 of the bearing to fully utilize the oil from the gear shaft provided with the lubricating oil path 2 to achieve full lubrication of the bearing. The outer wall of the outer frame 5 is in direct contact with the inner cavity 11 of the idle gear 12, serving as a bearing for the rotation of the idle gear 12. The outer end faces of the first ring body 71 and the second ring body 72 are respectively provided with anti-slip convex rings, and the tapered rollers are rolled in the grooves inside the anti-slip convex rings to prevent the rolling bearings from slipping out of the cavity surrounded by the first ring body 71 and the second ring body 72.

[0037] In a specific embodiment, an anti-slip boss is provided on the anti-slip end face of the inner cavity of the idle gear 12, and a clamping flange 9 is provided on the other end face of the idle gear 12 by bolt disassembly to prevent the bearing and the idle gear from slipping off.

[0038] The structure places the bearing inside the idle gear cavity, and the gear shaft 1 is provided with an oil lubrication channel 2. The oil lubricates the built-in bearing through the oil channel 2 to achieve lubrication and cooling of the bearing, thereby improving reliability and service life. The double tapered roller bearing 4 has an oil lubrication channel inside, and the outer strong frame is formed as a whole. The inner cavity frame 6 is provided with a two-body structure of a first ring body 71 and a second ring body 72, which is convenient for controlling the axial clearance of the bearing, and can ensure that the inner frame of the bearing can be directly pressed during use, without the need to control the axial clearance separately, and the double-row tapered roller bearing can withstand large axial and radial forces, and is an idler gear transmission structure that can withstand high power output.

[0039] In a specific embodiment, the journal 8 of the gear shaft 1 is in direct contact with the inner frame 6 of the double-row tapered roller bearing 4, and has an interference fit, and the inner frame 6 of the double-row tapered roller bearing 4 serves as a fixed ring. A positioning pin structure 3 is provided on the gear shaft 1, and the positioning pin structure 3 can ensure that the position of the entire structure is accurate and stable after installation, and the gear can also be precisely matched.

[0040] The gear shaft 1 is fitted with the inner hole of the double tapered roller bearing 4. The shaft end of the gear shaft 1 is provided with a locating pin structure 3, and the inside of the locating pin structure is provided with an oil lubrication channel 2. The oil channel 2 leads to the side of the journal 8 to lubricate the bearing. A pressing flange structure 9 is arranged at the end of the gear shaft 1. After the pressing flange structure 9 is fastened by the mounting bolts, it is ensured that the entire idle gear transmission structure will not move axially and rotates smoothly.

[0041] In a specific embodiment, it includes: a pressing flange 9; the pressing flange 9 is arranged on the gear shaft 1, serving as the bolt fastening position of the entire structure and ensuring the axial positioning of the gear at the same time.

[0042] In a specific embodiment, an external tooth structure 10 and an inner cavity 11 are arranged on the outer side wall of the idle gear 12. The external tooth structure 10 transmits torque with the adjacent gear, and the inner cavity 11 cooperates with the outer cage 5 of the double row tapered roller bearing 4 to realize the rotation of the idle gear 12 relative to the gear shaft 1.

[0043] In a specific embodiment, a stop is arranged on the inner cavity 11 to prevent the gear from moving axially on the gear shaft 1. The size of the external tooth 10 can be designed according to the size of the gear according to the layout of the gear train.

[0044] After the above components are processed individually and then assembled, an idle gear transmission structure with an internal bearing is formed. It has a high degree of integration and good versatility. The modular setting of the idle gear is realized, which is convenient for installation and use, and has a good lubrication effect.

[0045] Through the implementation of the solution, the entire structure realizes the integration of the gear structure, bearing structure, and gear shaft structure, and has an internal oil lubrication structure. The whole structure is compact and can transplant the whole structure to different models and different gear train positions. Due to the setting of the double row tapered roller bearing, this structure can withstand large axial forces and radial forces, can bear the large load of the engine gear train transmission, has high reliability, is beautiful and flexible in structure, has a modular design, good market interchangeability, and is convenient for market maintenance.

[0046] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular idler gear structure, characterized in that, Comprising: A double-row tapered roller bearing (4) and a gear shaft (1); the double-row tapered roller bearing (4) is sleeved on the gear shaft (1); a lubricating oil passage (2) is provided in the gear shaft (1); The double-row tapered roller bearing (4) comprises: an inner side skeleton (6), an outer side skeleton (5), and a plurality of tapered rollers; the tapered rollers are arranged to roll between the inner side skeleton (6) and the outer side skeleton (5); the inner side skeleton (6) is fitted and installed with the gear shaft (1); at least two built-in oil channels (7) are provided in the inner side skeleton (6); one end of the lubricating oil passage (2) is arranged facing the cross-section where the built-in oil channels (7) are located; The inner side skeleton (6) comprises: a first ring body (71) and a second ring body (72); a large fillet surface (73) is provided on the contact end surface of the first ring body (71) and the second ring body (72); the built-in oil channels (7) are arranged in the large fillet surface (73); The central angle of the large fillet surface (73) is 150° to 180°; The gear shaft (1) comprises: a journal (8); the journal (8) is in direct contact with the inner side skeleton (6) and is in interference fit.

2. The modular idle gear structure according to claim 1, wherein, The lubricating oil passage (2) comprises: a first section and a second section; the liquid inlet end of the first section is provided on the end surface of the gear shaft (1); the second end of the first section is communicated with the second section; the liquid outlet end of the second section is arranged facing the built-in oil channels (7).

3. The modular idler gear structure according to claim 1, wherein The gear shaft (1) comprises: a positioning pin structure (3); the positioning pin structure (3) protrudes from the mounting end surface of the gear shaft (1); the lubricating oil passage (2) is accommodated in the positioning pin structure (3).

4. The modular idler gear structure according to claim 3, wherein, Comprising: A pressing flange (9); an anti-disengagement boss is provided on the anti-disengagement end surface of the inner cavity of the idle gear (12); the pressing flange (9) is detachably arranged on the other end surface of the idle gear (12) through bolts.

5. The modular idler gear structure according to claim 1, wherein Comprising: An idle gear (12); the idle gear (12) is sleeved on the outer wall of the double-row tapered roller bearing (4).

6. The modular idler gear structure according to claim 1, wherein, The built-in oil channels (7) are symmetrically arranged on the inner side wall of the inner side skeleton (6) and penetrate through the inner side skeleton (6).

7. The modular idler gear structure according to claim 1, wherein Anti-disengagement convex rings are respectively provided on the outer side end surfaces of the first ring body (71) and the second ring body (72); the tapered rollers are arranged to roll within the anti-disengagement convex rings.

Images