Rear power take-off structure and engine

Abstract

The utility model relates to the technical field of engines, and discloses a rear power take-off structure and an engine, the rear power take-off structure comprises a shell, a gear shaft and a belt pulley, the gear shaft comprises a transmission shaft and a gear, the transmission shaft can be rotatably arranged in the shell in a penetrating mode, the gear is integrally connected to one end of the transmission shaft, and the belt pulley is arranged at the end, away from the gear, of the transmission shaft in a sleeving mode. The belt pulley is used for transmitting power output by the gear shaft to a rear-end load. The gear shaft is arranged, the gear and the transmission shaft are integrally designed, an output flange is omitted, the structure is simple, when the oil seal goes wrong and needs to be replaced, disassembly and replacement are convenient, convenience is provided for maintenance and replacement of the oil seal, meanwhile, the belt wheel connected with the gear shaft is arranged, and the belt wheel is connected with a rear-end load, so that the service life of the oil seal is prolonged. And different working condition requirements are met by configuring different belt pulleys, and the power take-off requirements of various load working conditions can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a rear power take-off structure and an engine. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] The rear power take-off structure is a gear transmission device. When the vehicle engine rotates, the power of the engine is transmitted to the vehicle through the transmission system. In the existing rear power take-off structure, the power take-off gear and the transmission shaft are separately set, the transmission shaft and the output flange are integrated, the oil pump shaft is connected to the output flange, and the output flange structure is only suitable for a single working condition of the oil pump. In addition, since the seal is very important in the rear power take-off, when the oil seal has a problem and needs to be replaced, the output flange and the power take-off gear need to be removed, and the output flange needs to be withdrawn from the support bearing, which makes disassembly and assembly inconvenient and the process cumbersome. Utility Model Content

[0004] The purpose of the utility model is to at least solve the problem that the output flange structure is only suitable for a single working condition of the oil pump, and is inconvenient to disassemble and assemble, and the process is cumbersome. This purpose is achieved through the following technical solutions:

[0005] The first aspect of the utility model provides a rear power take-off structure, comprising:

[0006] case;

[0007] A gear shaft, comprising a transmission shaft and a gear, wherein the transmission shaft is rotatably disposed in the housing, and the gear is integrally connected to one end of the transmission shaft;

[0008] A pulley is sleeved on an end of the transmission shaft away from the gear, and is used to transmit the power output by the gear shaft to a rear end load.

[0009] The rear power take-off structure of the utility model is designed as an integrated unit with the gear and the transmission shaft by setting a gear shaft, and the output flange is eliminated, so the structure is simple. When the oil seal has a problem and needs to be replaced, it is easy to disassemble and replace, which provides convenience for the maintenance and replacement of the oil seal. At the same time, by setting a pulley connected to the gear shaft, the pulley is connected to the rear end load, and different pulleys are configured to meet different working conditions, the power take-off requirements of various load conditions can be realized, and the applicability is strong.

[0010] In addition, the rear power take-off structure according to the utility model may also have the following additional technical features:

[0011] In some embodiments of the utility model, the rear power take-off structure further includes a skeleton oil seal and a bushing, the bushing is sleeved on the transmission shaft and located in the housing, and the skeleton oil seal is arranged between the housing and the bushing.

[0012] In some embodiments of the present utility model, the rear power take-off structure further includes a first bearing, the first bearing is disposed in the housing and sleeved on the transmission shaft, and the first bearing abuts against the gear along the axial direction of the first bearing.

[0013] In some embodiments of the utility model, the rear power take-off structure further includes a second bearing, the second bearing is disposed in the housing and sleeved on the gear shaft, and the second bearing is spaced apart from the first bearing along the axial direction of the gear shaft.

[0014] In some embodiments of the present invention, the first bearing is a cylindrical roller bearing, and the second bearing is a deep groove ball bearing.

[0015] In some embodiments of the present utility model, the rear power take-off structure further includes a lubrication port, which passes through the housing and is used to provide lubricating oil to the first bearing and the second bearing.

[0016] In some embodiments of the present invention, the rear power take-off structure further includes a thrust ring, which is sleeved on the transmission shaft and disposed between the first bearing and the second bearing, and is used for axially positioning the first bearing and the second bearing.

[0017] In some embodiments of the present invention, the rear power take-off structure further includes a dustproof member, wherein the dustproof member is disposed between the pulley and the housing, and the dustproof member is interference fit with the pulley.

[0018] In some embodiments of the utility model, the rear power take-off structure further includes a fastener and a pressure plate, the pressure plate transmission shaft is close to one end of the pulley, and the fastener is passed through the pressure plate and connected to the transmission shaft.

[0019] Another aspect of the present invention provides an engine, comprising the rear power take-off structure as described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1The structure diagram of the rear power take-off structure according to the embodiment of the utility model is schematically shown;

[0022] Figure 2 A cross-sectional schematic diagram of a rear power take-off structure according to an embodiment of the utility model is schematically shown.

[0023] The reference numerals are as follows:

[0024] 1. Housing; 2. Gear shaft; 20. Transmission shaft; 21. Gear; 3. Pulley; 4. Skeleton oil seal; 5. Bushing; 6. First bearing; 7. Second bearing; 8. Lubrication port; 9. Thrust ring; 10. Dustproof part; 11. Fastener; 12. Pressure plate; 13. First circlip; 14. Second circlip; 15. Bolt hole. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0026] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0027] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0028] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0029] The engine rear power take-off is also called the engine power take-off or power output device. It refers to a mechanical device that transmits the engine power to the rear of the vehicle through the transmission system when the vehicle engine is rotating. In the existing rear power take-off structure, the power take-off gear and the drive shaft are separately set. The power take-off gear usually meshes with the intermediate gear to transmit power. The drive shaft and the output flange are set as an integral part. The oil pump shaft is connected to the output flange. The output flange structure is only suitable for a single oil pump working condition and is not suitable for other load power take-off requirements such as rear air conditioning working conditions. In addition, since the seal is very important in the rear power take-off, when the oil seal has a problem and needs to be replaced, the output flange and power take-off gear need to be removed, and the output flange needs to be withdrawn from the support bearing. The process is cumbersome, and the output flange connected to the rear power take-off load is connected by an internal key. The integrated output flange is inconvenient to repair and has high design and processing costs.

[0030] In view of this, the present embodiment provides a rear power take-off structure, which aims to solve the above-mentioned technical problems by integrating the gear 21 with the transmission shaft 20 and eliminating the output flange, so as to achieve a simple and compact structure and convenient maintenance. At the same time, a pulley 3 is connected to the end of the gear shaft 2 to connect different rear-end loads and meet different working conditions.

[0031] like Figure 1 to Figure 2 As shown, according to the embodiment of the utility model, a rear power take-off structure is proposed, which includes a housing 1, a gear shaft 2 and a pulley 3. The gear shaft 2 includes a transmission shaft 20 and a gear 21. The transmission shaft 20 can be rotatably inserted into the housing 1. The transmission shaft 20 has a first end and a second end. The gear 21 is integrally connected to the transmission shaft 20 and is arranged close to the first end. It can be understood that the gear 21 is connected to the transmission shaft 20 as a whole, and the gear 21 is transmission-connected to the transmission shaft 20. The pulley 3 is sleeved on the end of the transmission shaft 20 away from the gear 21. The gear shaft 2 is provided with an external spline or a flat keyway. The pulley 3 and the gear shaft 2 can be spline-connected or flat-key-connected. The pulley 3 is used to transmit the power output by the gear shaft 2 to the rear end load.

[0032] In this embodiment, the rear load includes an air conditioner, which is arranged at the rear end of the engine. The reason for the rear placement of the air conditioner may be that there are many air conditioners, such as dual air conditioners, or it may be required by the working conditions. The above-mentioned pulley 3 may be a multi-ribbed pulley or a car V-belt pulley.

[0033] The rear power take-off structure of the utility model is designed to be an integrated unit with the gear 21 and the transmission shaft 20 by setting a gear shaft 2, and the output flange is eliminated. The structure is simple, and when the oil seal has a problem and needs to be replaced, it is easy to disassemble and replace, which provides convenience for the maintenance and replacement of the oil seal. At the same time, by setting a pulley 3 connected to the gear shaft 2, the pulley 3 is connected to the rear end load, and the structure meets the engine air conditioning rear working condition, especially the dual air conditioning working condition, and meets different working condition requirements by configuring different pulleys 3, and can realize the power take-off requirements of various load working conditions, and has strong applicability.

[0034] In some embodiments of the utility model, the rear power take-off structure further includes a skeleton oil seal 4 and a bushing 5, and the bushing 5 is sleeved on the transmission shaft 20 and located in the housing. Specifically, the bushing 5 is arranged between the transmission shaft 20 and the housing, and sleeved on the shaft of the transmission shaft 20, and the skeleton oil seal 4 is interference fit with the housing 1, and the skeleton oil seal 4 is located at one end close to the second end of the transmission shaft 20. The function of the oil seal is to isolate the parts of the transmission components that need lubrication from the external environment to prevent the leakage of lubricating oil. The skeleton is equivalent to the steel bars in the concrete component, which plays a reinforcing role and enables the oil seal to maintain its shape and tension. The skeleton oil seal 4 can be a single lip oil seal or a double lip oil seal. The auxiliary lip of the double lip skeleton oil seal 4 plays a dustproof role, preventing external dust, impurities, etc. from entering the interior of the machine. At the same time, the interference fit between the skeleton oil seal 4 and the housing 1 can ensure a better sealing effect, further improve and reduce the risk of oil leakage, and improve the stability and reliability of the engine operation.

[0035] In some embodiments of the utility model, the rear power take-off structure further includes a fastener 11 and a pressure plate 12, the pressure plate 12 is arranged at one end of the transmission shaft 20 close to the pulley, and the fastener 11 is passed through the pressure plate 12 and connected to the transmission shaft 20. In this embodiment, the fastener 11 includes a fastening bolt, and the pressure plate 12 is arranged at the second end of the transmission shaft 20. The pulley 3 can be pressed against the transmission shaft 20 along the axial direction of the transmission shaft 20 by the bolt, further ensuring the transmission reliability between the pulley 3 and the transmission shaft 20; at the same time, the pressure plate 12 can prevent the bolt from directly contacting the side of the pulley 3.

[0036] It should be noted that, in other embodiments, the fastener 11 may also be a structure such as a pin, and the pressure plate 12 may also be other structures such as a gasket.

[0037] In some embodiments of the utility model, the rear power take-off structure further includes a first bearing 6, which is sleeved on the transmission shaft 20 and arranged between the transmission shaft 20 and the housing 1, and the first bearing 6 is in contact with the gear 21 along the axial direction of the first bearing 6. Specifically, the first bearing 6 is a cylindrical roller bearing. The first bearing 6 is mounted on the housing 1, and the inner hole of the first bearing 6 is mounted on the transmission shaft 20, and the outer ring of the first bearing 6 is interference fit with the housing. By setting the first bearing 6, the rotational fit between the gear shaft 2 and the housing 1 can be ensured, and at the same time, the interference fit between the outer ring of the first bearing 6 and the housing can limit the first bearing 6, thereby ensuring the fixing effect of the first bearing 6.

[0038] In this embodiment, the rear power take-off structure also includes a first elastic retaining ring 13. A first groove is provided on the inner wall of the housing 1 on the side close to the gear 21. The first elastic retaining ring 13 is engaged with the first groove and abuts against the outer ring of the first bearing 6. By providing the first elastic retaining ring 13, the first bearing 6 can be limited.

[0039] In some embodiments of the utility model, the rear power take-off structure further includes a second bearing 7, which is arranged in the housing and sleeved on the transmission shaft 20, and the second bearing 7 is spaced apart from the first bearing 6 along the axial direction of the gear shaft 2. Specifically, the second bearing 7 is a deep groove ball bearing. The second bearing 7 is mounted on the housing 1, and the inner hole of the second bearing 7 is mounted on the transmission shaft 20, and the outer ring of the second bearing 7 is interference fit with the housing 1. By setting the second bearing 7, the rotation effect between the gear shaft 2 and the housing 1 can be further guaranteed, and at the same time, the interference fit between the outer ring of the second bearing 7 and the housing can limit the second bearing 7, thereby ensuring the fixing effect of the second bearing 7.

[0040] In this embodiment, the rear power take-off structure also includes a second elastic retaining ring 14. A second slot is provided on the inner wall of the housing 1. The second elastic retaining ring 14 is engaged with the second slot and abuts against the outer ring of the second bearing 7. The second elastic retaining ring 14 is located between the first bearing 6 and the second bearing 7. The second elastic retaining ring 14 can be set to limit the second bearing 7.

[0041] In other embodiments, the first bearing 6 and the second bearing 7 may also be tapered roller bearings or angular contact ball bearings, etc., which is not limited in this embodiment.

[0042] In other embodiments, a retaining ring or other structures may be used to replace the first elastic retaining ring 13 and the second elastic retaining ring 14, which is not limited in this embodiment.

[0043] In some embodiments of the utility model, the rear power take-off structure further includes a lubrication port 8 for providing lubricating oil to the first bearing 6 and the second bearing 7. Specifically, the lubrication port 8 passes through the housing 1 and is in communication with the first bearing 6 and the second bearing 7. The lubricating oil is injected into the housing 1 through the lubrication port 8 to lubricate the first bearing 6 and the second bearing 7, thereby reducing the mutual friction between the components and extending the service life.

[0044] In some embodiments of the utility model, the rear power take-off structure further includes a thrust ring 9, which is sleeved on the transmission shaft 20 and disposed between the first bearing 6 and the second bearing 7, and is used to axially position the first bearing 6 and the second bearing 7. Specifically, the thrust ring 9 is sleeved on the transmission shaft 20, and the two sides of the thrust ring 9 along the axial direction are respectively in contact with the first bearing 6 and the second bearing 7, wherein one side of the thrust ring 9 is in contact with the inner ring of the first bearing 6, and the other side of the thrust ring 9 is in contact with the inner ring of the second bearing 7. By providing the thrust ring 9, the first bearing 6 and the second bearing 7 can be further limited in the axial direction.

[0045] In other embodiments, the thrust ring 9 may not be provided, and the gear shaft 2 may be designed as a stepped shaft, and the first bearing 6 and the second bearing 7 may be limited by shaft shoulders.

[0046] In some embodiments of the utility model, the rear power take-off structure further includes a dustproof member 10, which is arranged between the pulley 3 and the housing 1, and the dustproof member 10 is interference fit with the pulley 3. In this embodiment, the dustproof member 10 includes a dustproof cap. The dustproof cap is installed on the pulley 3 by interference fit, and the axial position is limited by the pulley 3 and the housing 1. The dustproof cap can prevent dust and impurities from entering the housing 1.

[0047] In other embodiments, the dustproof member 10 may also be a FB type dustproof ring, which is not limited in this embodiment.

[0048] The second aspect of the utility model provides an engine, which includes the above-mentioned rear power take-off structure, a housing as the frame of the entire engine, and a plurality of bolt holes 15 are provided on the housing, and the housing is fixed by bolts to play a fixing and supporting role. Of course, the engine of this embodiment also has other structures and components that existing engines have, and since this embodiment does not involve these structures and components, they will not be described in detail.

[0049] The engine of this embodiment includes a rear power take-off structure. The gear shaft 2 is set so that the gear 21 and the transmission shaft 20 are designed as an integrated whole, and the output flange is eliminated. The structure is simple. When the oil seal has a problem and needs to be replaced, it is easy to disassemble and replace, which provides convenience for the maintenance and replacement of the oil seal. At the same time, by setting a pulley 3 connected to the gear shaft 2, the pulley 3 is connected to the rear end load, and different pulleys 3 are configured to meet different working conditions, so that the power take-off requirements of various load conditions can be realized, and the applicability is strong.

[0050] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A rear power take-off structure, characterized in that: include: case; A gear shaft, comprising a transmission shaft and a gear, wherein the transmission shaft is rotatably disposed in the housing, and the gear is integrally connected to one end of the transmission shaft; A pulley is sleeved on an end of the transmission shaft away from the gear, and is used to transmit the power output by the gear shaft to a rear end load.

2. The rear power take-off structure according to claim 1, characterized in that: The rear power take-off structure further includes a skeleton oil seal and a bushing. The bushing is sleeved on the transmission shaft and located in the housing. The skeleton oil seal is arranged between the housing and the bushing.

3. The rear power take-off structure according to claim 1, characterized in that: The rear power take-off structure further includes a first bearing, which is disposed on the housing and sleeved on the transmission shaft, and the first bearing abuts against the gear along an axial direction of the first bearing.

4. The rear power take-off structure according to claim 3, characterized in that: The rear power take-off structure further includes a second bearing, which is disposed on the housing and sleeved on the transmission shaft. The second bearing is spaced apart from the first bearing along the axial direction of the gear shaft.

5. The rear power take-off structure according to claim 4, characterized in that: The first bearing is a cylindrical roller bearing, and the second bearing is a deep groove ball bearing.

6. The rear power take-off structure according to claim 4, characterized in that: The rear power take-off structure further includes a lubrication port, which passes through the housing and is used to provide lubrication oil to the first bearing and the second bearing.

7. The rear power take-off structure according to claim 4, characterized in that: The rear power take-off structure further includes a thrust ring, which is sleeved on the transmission shaft and disposed between the first bearing and the second bearing, and is used for axially positioning the first bearing and the second bearing.

8. The rear power take-off structure according to claim 1, characterized in that: The rear power take-off structure further includes a dustproof member, which is disposed between the pulley and the housing, and has an interference fit with the pulley.

9. The rear power take-off structure according to claim 1, characterized in that: The rear power take-off structure also includes a fastener and a pressure plate. The pressure plate is arranged at one end of the transmission shaft close to the pulley, and the fastener passes through the pressure plate and is connected to the transmission shaft.

10. An engine, characterized in that: The invention comprises the rear power take-off structure as claimed in any one of claims 1 to 9.

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