Power transmission structure between engine and lubricating oil pump

Abstract

The invention provides a power transmission structure between an engine and a lubricating oil pump, which comprises an engine body and a lubricating oil pump body, and a crankshaft of the engine body is connected with an input shaft of the lubricating oil pump body through a transmission structure; a transmission cavity is defined by the driving shell set, the transmission structure is arranged in the transmission cavity, and the transmission cavity communicates with a crankshaft cavity of the engine body; the driving shell set is provided with an oil inlet way and an oil return way, the oil inlet way is communicated with the crankshaft cavity, and the oil return way is communicated with the transmission cavity. The transmission structure is arranged between the engine and the lubricating oil pump, and the oil inlet way and the oil return way are formed in the driving shell set, so that lubricating oil can enter the crankshaft cavity and the transmission cavity, and the lubricating oil is provided for the crankshaft of the engine and an external transmission structure at the same time through a simple structure to lubricate and cool the structure; and the device can run smoothly.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engines, and in particular relates to a power transmission structure between an engine and a lubricating oil pump. Background Art

[0002] Some transport vehicle training vehicles will be modified with old diesel engines. In order to meet the corresponding performance and functional requirements of the training vehicles, some old diesel engines need to be matched with electronic speed governors, power lubricating oil pumps and other devices, so as to meet the power and functional requirements of the training vehicles while maintaining the overall performance of the engine. In order to provide power to the power lubricating oil pump through the diesel engine and drive the lubricating oil pump to work, the lubricating oil pump needs to be connected to the power structure of the engine. The diesel engine also needs to provide power to the vehicle, and the connection method in the existing technology cannot meet the lubrication and stability requirements of the transmission structure. Summary of the invention

[0003] In view of this, the present invention aims to provide a power transmission structure between an engine and a lubricating oil pump, so as to provide power to the lubricating oil pump through the power structure of the diesel engine.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A power transmission structure between an engine and a lubricating oil pump, comprising:

[0006] The engine body and the lubricating oil pump body, the crankshaft of the engine body and the input shaft of the lubricating oil pump body are connected through a transmission structure;

[0007] The drive housing assembly surrounds a transmission cavity, the transmission structure is placed in the transmission cavity, and the transmission cavity is connected to the crankshaft cavity of the engine body; an oil inlet passage and an oil return passage are opened on the drive housing assembly, the oil inlet passage is connected to the crankshaft cavity, and the oil return passage is connected to the transmission cavity.

[0008] Furthermore, the opening direction of the oil inlet passage close to one end of the crankshaft cavity is oriented towards a direction away from the transmission cavity; the opening direction of the oil return passage close to one end of the transmission cavity is oriented towards a direction away from the crankshaft cavity.

[0009] Furthermore, the transmission structure includes an elastic shaft and a drive shaft, one end of the elastic shaft is connected to the crankshaft spline, and the other end is connected to the drive shaft, and the other end of the drive shaft is connected to the input shaft of the lubricating oil pump.

[0010] Furthermore, the aspect ratio of the elastic shaft is greater than 8.16.

[0011] Furthermore, the material of the elastic shaft is 18Cr2Ni4WA.

[0012] Furthermore, the drive shell group includes a first drive shell and a second drive shell, the first drive shell is connected to the engine housing, the second drive shell group is connected to the lubricating oil pump housing, the first drive shell and the second drive shell are connected by a flange, a first bushing is provided in the first drive shell, and a second bushing is provided in the second drive shell, and both ends of the drive shaft are respectively placed in the first bushing and the second bushing.

[0013] Furthermore, a limiting edge is extended outwardly from the middle portion of the driving shaft, and a first flange is extended outwardly from the end surface of the first bushing, and the first flange can be against the limiting edge.

[0014] Furthermore, a second flange is extended outwardly from the end surface of the second bushing, a retaining ring is sleeved on the drive shaft, and an adjustment pad is provided between the retaining ring and the second flange.

[0015] Furthermore, a force ring is sleeved on the driving shaft, one end of the force ring abuts against the retaining ring, and the other end of the force ring abuts against the adjusting pad.

[0016] Furthermore, the stress ring is composed of two half rings, and a sleeve ring is provided between the stress ring and the retaining ring. The cross section of the sleeve ring is L-shaped, and the stress ring is placed between the sleeve ring and the side wall of the drive shaft.

[0017] Compared with the prior art, the power transmission structure between the engine and the lubricating oil pump described in the present invention has the following advantages:

[0018] The present invention sets a transmission structure between the engine and the lubricating oil pump, and opens an oil inlet and an oil return path on the driving housing assembly, so that the lubricating oil can enter the crankshaft cavity and the transmission cavity. The lubricating oil is provided to the crankshaft of the engine and the external transmission structure at the same time through a simple structure for structural lubrication and cooling, so that the device can run smoothly.

[0019] An elastic shaft with a large aspect ratio and high material toughness is set between the engine and the lubricating oil pump to buffer the torque transmission between the crankshaft and the lubricating oil pump, preventing the lubricating oil pump from being unable to quickly enter the working state due to the sudden operation of the crankshaft, resulting in the gears in the lubricating oil pump suddenly bearing excessive load;

[0020] The adjusting pad and the force ring cooperate with the ferrule to control the axial position of the driving shaft, thereby adjusting the axial clearance between the driving shaft and the elastic shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1It is the overall schematic diagram of the transmission structure of the engine and lubricating oil pump;

[0023] Figure 2 It is a schematic diagram of the connection relationship of the transmission structure;

[0024] Figure 3 is a schematic cross-sectional view of the first driving housing structure;

[0025] Figure 4 It is a schematic cross-sectional view of the drive shaft structure.

[0026] Description of reference numerals:

[0027] 1-engine body; 11-crankshaft; 12-crankshaft cavity; 2-lubricating oil pump body; 21-input shaft; 3-drive housing assembly; 31-first drive housing; 311-oil inlet oil circuit; 312-oil return oil circuit; 313-first bushing; 3131-first flange; 314-oil groove; 32-second drive housing; 321-second bushing; 3211-second flange; 33-transmission cavity; 4-elastic shaft; 5-drive shaft; 51-limiting edge; 52-slot; 53-positioning groove; 54-ring; 55-retaining ring; 56-stress ring; 57-adjusting pad. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] The power transmission structure between the engine and the lubricating oil pump described in the present invention includes a crankshaft 11 in the engine body 1 and an input shaft 21 of the lubricating oil pump body 2, and the input shaft 21 is driven to work by the crankshaft 11. Specifically, the crankshaft 11 and the input shaft 21 are connected by a transmission structure; the transmission structure is arranged in the drive housing group 3, and the drive housing group 3 provides support and lubrication for the transmission structure.

[0033] The transmission unit comprises an elastic shaft 4 and a drive shaft 5, both ends of the elastic shaft 4 are provided with external splines, one end of the elastic shaft 4 extends into the crankshaft cavity 12 and is connected with the internal splines at the tail end of the crankshaft 11, and the other end of the elastic shaft 4 is connected with the drive shaft 5, and both ends of the drive shaft 5 are provided with internal splines matching with the external splines of the input shaft 21 of the lubricating oil pump and internal splines matching with the external splines at the end of the elastic shaft 4, and the elastic shaft 4 is connected with the input shaft 21 through the drive shaft 5. In this embodiment, the material of the elastic shaft 4 is made of 18Cr2Ni4WA alloy steel with high impact toughness and fatigue strength, and the aspect ratio of the elastic shaft 4 is 8.16. A larger or slightly smaller aspect ratio can be set as needed, so that within the range allowed by the elastic limit of the material, the elastic shaft 4 can have a larger elastic torsional deformation, and when the torque is transmitted to the lubricating oil pump through the elastic shaft 4, the shaft has a certain buffering capacity to prevent the gear from suddenly entering the working speed and bearing excessive impact load, thereby protecting the lubricating oil pump. Except for the surface of the polished rod, all parts are carburized, the carburization depth is 0.3-0.6mm, the hardness of the carburized layer is HRC≥54, and the hardness of the non-carburized surface is HRC35-43. The ratio of the polished rod diameter to the spline bottom diameter of the elastic shaft 4 is greater than 0.8. In this embodiment, the ratio of the polished rod diameter to the spline bottom diameter is 0.98, and a transition fillet of R25mm is set at the diameter change position to avoid large stress concentration at the transition fillet and improve the service life of the parts.

[0034] The drive housing assembly 3 includes a first drive housing 31 and a second drive housing 32, wherein the first drive housing 31 is connected to the engine housing, and the second drive housing 32 is connected to the lubricating oil pump housing. The first drive housing 31 and the second drive housing 32 are connected by a flange, so that the first drive housing 31 and the second drive housing 32 surround and form a transmission cavity 33, wherein the transmission structure is disposed in the transmission cavity 33, and the transmission cavity 33 is communicated with the crankshaft cavity 12 of the engine body 1; an oil inlet passage 311 and an oil return passage 312 are provided on the drive housing assembly 3, wherein the oil inlet passage 311 is communicated with the crankshaft cavity 12, and the oil return passage 312 is communicated with the crankshaft cavity 12. 2 is connected to the transmission cavity, the opening direction of the oil inlet circuit 311 near the crank chamber 12 is oriented away from the transmission cavity 33; the opening direction of the oil return circuit 312 near the transmission cavity 33 is oriented away from the crank chamber 12, so that the lubricating oil in the oil inlet circuit 311 can directly enter the crank chamber 12. When the crank chamber 12 is filled with lubricating oil, it flows to the transmission cavity 33 through the connecting portion between the transmission cavity 33 and the crank chamber 12, and flows out from the oil return circuit 312 of the transmission cavity 33, forming an oil circuit circulation, thereby lubricating and cooling the crankshaft 11 and the transmission structure. Specifically, in this embodiment, the oil inlet circuit and the oil return circuit 312 are both placed in the first drive shell 31, and the first drive shell 31 and the second drive shell 32 are respectively provided with stepped holes arranged oppositely, and the opening of the oil return circuit 312 is on the hole wall with a larger diameter of the stepped hole of the first drive shell 31. An annular oil groove 314 is formed on the end surface of the first drive housing 31 facing the engine, and the opening of the oil inlet passage 311 is placed at the bottom of the oil groove 314. After the main oil supply passage cover of the engine is removed and the first drive housing 31 is installed on the engine, the oil groove 314 and the ring body of the engine and the main oil supply passage cover are matched, so that the lubricating oil is delivered into the crankshaft chamber 12 through the oil inlet passage 311.

[0035] A first bushing 313 is provided in the first drive housing 31, and a second bushing 321 is provided in the second drive housing 32. The two ends of the drive shaft 5 are respectively placed in the first bushing 313 and the second bushing 321. The two drive housings and bushings support the two ends of the drive shaft 5. At the same time, since the ends of the elastic shaft 4 are respectively placed in the drive shaft 5 and the crankshaft 11, the elastic shaft 4 can be indirectly supported by the crankshaft 11 and the drive shaft 5. A limiting edge 51 extends outward from the middle of the drive shaft, and a first flange 3131 extends outward from the end surface of the first bushing 313, and the first flange 3131 can abut against the limiting edge 51. The end surface of the second bushing 321 extends outwardly from a second flange 3211, and a retaining ring 55 is sleeved on the drive shaft 5. An adjustment pad 57 is arranged between the retaining ring 55 and the second flange 3211. In actual production, the adjustment pad 57 is designed with multiple thicknesses. The operator can select adjustment pads 57 of different thicknesses according to the spacing between the drive shaft 5 and the bushing and the actual position of the drive shaft 5 required, and then adjust the position of the drive shaft 5 so that the axial movement of the drive shaft 5 is between 0.2-0.35mm. An annular groove 52 and a positioning groove 53 are opened on the upper edge of the drive shaft 5. A C-shaped retaining ring 55 is arranged in the groove 52. A sleeve 54 is sleeved on the drive shaft 5, and the sleeve 54 is placed between the groove 52 and the positioning groove 53. A force ring 56 is arranged in the positioning groove 53. In order to facilitate installation, the force ring 56 is composed of two half rings. The cross section of the sleeve 54 is L-shaped, and the half ring is placed in the space surrounded by the sleeve 54 and the outer wall of the drive shaft 5. The force ring 56 is limited by the L-shaped collar 54 , and the force ring 56 abuts against the adjustment pad 57 , thereby controlling the axial transmission amount of the drive shaft 5 .

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power transmission structure between an engine and a lubricating oil pump, characterized in that: It includes an engine body and a lubricating oil pump body, wherein the crankshaft of the engine body and the input shaft of the lubricating oil pump body are connected via a transmission structure; The drive housing assembly surrounds a transmission cavity, the transmission structure is placed in the transmission cavity, and the transmission cavity is connected to the crankshaft cavity of the engine body; an oil inlet passage and an oil return passage are opened on the drive housing assembly, the oil inlet passage is connected to the crankshaft cavity, and the oil return passage is connected to the transmission cavity.

2. The power transmission structure between an engine and a lubricating oil pump according to claim 1, characterized in that: The opening direction of the oil inlet oil passage close to one end of the crankshaft cavity is oriented towards a direction away from the transmission cavity; the opening direction of the oil return oil passage close to one end of the transmission cavity is oriented towards a direction away from the crankshaft cavity.

3. The power transmission structure between an engine and a lubricating oil pump according to claim 1, characterized in that: The transmission structure comprises an elastic shaft and a drive shaft, one end of the elastic shaft is connected to the crankshaft spline, and the other end is connected to the drive shaft, and the other end of the drive shaft is connected to the input shaft of the lubricating oil pump.

4. The power transmission structure between the engine and the lubricating oil pump according to claim 3, characterized in that: The aspect ratio of the elastic shaft is greater than 8.

16.

5. The power transmission structure between an engine and a lubricating oil pump according to claim 3, characterized in that: The material of the elastic shaft is 18Cr2Ni4WA.

6. The power transmission structure between an engine and a lubricating oil pump according to claim 1, characterized in that: The drive shell assembly includes a first drive shell and a second drive shell, the first drive shell is connected to the engine housing, the second drive shell assembly is connected to the lubricating oil pump housing, the first drive shell and the second drive shell are connected by a flange, a first bushing is provided in the first drive shell, a second bushing is provided in the second drive shell, and both ends of the drive shaft are respectively placed in the first bushing and the second bushing.

7. The power transmission structure between the engine and the lubricating oil pump according to claim 6, characterized in that: A limiting edge extends outwardly from the middle portion of the driving shaft, and a first flange extends outwardly from the end surface of the first bushing. The first flange can abut against the limiting edge.

8. The power transmission structure between an engine and a lubricating oil pump according to claim 6, characterized in that: A second flange is extended outwardly from the end surface of the second bushing, a retaining ring is sleeved on the drive shaft, and an adjustment pad is provided between the retaining ring and the second flange.

9. The power transmission structure between the engine and the lubricating oil pump according to claim 8, characterized in that: A force ring is also sleeved on the driving shaft, one end of the force ring abuts against the retaining ring, and the other end abuts against the adjusting pad.

10. The power transmission structure between an engine and a lubricating oil pump according to claim 9, characterized in that: The stress ring is composed of two half rings. A sleeve ring is provided between the stress ring and the retaining ring. The cross section of the sleeve ring is L-shaped. The stress ring is placed between the sleeve ring and the side wall of the driving shaft.

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