Engine rear power take-off device

Abstract

The utility model discloses a kind of engine rear power take-off device, belong to engine parts technical field, including shell and the gear shaft installed in the shell, the rear end of the gear shaft is provided with cavity, the inner wall of the cavity is provided with the first inner spline for assembling hydraulic pump input shaft;The rear power take-off device further includes output flange, the output flange is sleeved in the outside of the rear end of the gear shaft, the output flange with the gear shaft between fixed connection and the gear shaft synchronous rotation, the design can be connected by the outer spline of hydraulic pump input shaft and the first inner spline of gear shaft, realize rear power take-off device to hydraulic pump output torque, output flange and flange structure of transmission shaft can also be connected, realize rear power take-off device to transmission shaft output torque, can satisfy the demand of different output mode, without disassembly or replacement parts, with universality, can effectively reduce cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine parts, specifically relating to a rear power take-off device for an engine. Background Technology

[0002] The rear take-off (RTO) unit on an engine plays a crucial role in outputting working torque in various construction machinery models, making it an important engine accessory. The output structure of the rear end of the RTO differs depending on its application. For example, the RTO unit used in concrete mixer trucks has a flange structure because it needs to connect to the drive shaft, while the RTO unit used in mining trucks has an internal spline structure because it needs to connect to a hydraulic pump. To adapt to different applications, the RTO unit requires two different output structures, lacking versatility. This necessitates designing two sets of molds for manufacturing the RTO unit, increasing costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a rear power take-off device for an engine that can meet the needs of different output methods, has good versatility, and can effectively reduce costs, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A rear power take-off (PTO) device for an engine includes a housing and a gear shaft installed within the housing. The rear end of the gear shaft has a cavity, and the inner wall of the cavity is provided with a first internal spline for assembling a hydraulic pump input shaft. The PTO device also includes an output flange, which is fitted onto the outer side of the rear end of the gear shaft. The output flange is fixedly connected to the gear shaft and rotates synchronously with the gear shaft.

[0006] Furthermore, the output flange has a hollow interior, and the inner wall of the output flange is provided with a second internal spline. The outer wall of the gear shaft is provided with a second external spline, and the gear shaft is connected to the output flange via the external spline.

[0007] Furthermore, a fastening nut is fitted at the rear end of the gear shaft, and the fastening nut is threadedly connected to the rear end of the gear shaft and tightens the output flange.

[0008] Furthermore, the hollow structure inside the output flange is a stepped hole, and the front end face of the fastening nut abuts against the stepped surface of the stepped hole.

[0009] Furthermore, the stepped hole forms a positioning stop on the connection surface of the output flange, and the structure of the positioning stop is adapted to the positioning structure of the connection surface between the drive shaft and the hydraulic pump.

[0010] Furthermore, the housing is fitted onto the outside of the output flange, and an oil seal is installed between the housing and the output flange.

[0011] Furthermore, the gear shaft is assembled within the housing via a first bearing and a second bearing, with the first bearing and the second bearing installed at an interval.

[0012] Furthermore, a support ring is fitted onto the gear shaft between the first bearing and the second bearing.

[0013] Furthermore, retaining rings are respectively installed between the front and rear sides of the outer ring of the first bearing and the housing, and a retaining ring is installed between the front side of the outer ring of the second bearing and the housing, and the rear side abuts against the limiting platform of the inner wall of the housing.

[0014] Furthermore, the inner wall of the housing is provided with multiple mounting grooves that are adapted to the retaining ring structure.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] The rear power take-off (PTO) device for an engine disclosed in this utility model can be configured such that the input shaft of the hydraulic pump is splined with the gear shaft to output torque to the hydraulic pump, or the output flange is connected with the flange structure of the drive shaft to output torque to the drive shaft. This can meet the needs of different output methods, does not require disassembly or replacement of parts, has versatility, and can effectively reduce costs.

[0017] In this invention, the output flange is circumferentially limited by the spline structure between it and the gear shaft, and axially limited by the fastening nut installed on the gear shaft, thereby fixing the output flange. This fixing method has a simple structure, good fixing effect, is easy to install and easy to process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rear power take-off device of the engine according to this utility model;

[0019] Figure 2 This is a schematic diagram of the gear shaft structure;

[0020] Figure 3 yes Figure 2 Axial sectional view;

[0021] Figure 4 This is a structural diagram of the output flange;

[0022] Figure 5 yes Figure 4 Axial sectional view;

[0023] In the diagram, 1-gear shaft, 11-gear, 12-first internal spline, 13-second external spline, 14-fastening nut, 2-output flange, 21-second internal spline, 22-stepped surface, 23-locating stop, 24-bolt hole, 3-housing, 31-first bearing, 32-support ring, 33-second bearing, 34-retaining ring, 35-limiting platform, 36-oil seal. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0025] In the description of this application, it should be noted that "front" refers to one side of the gear 11 on the rear power take-off device, and "rear" refers to one side of the output flange 2.

[0026] like Figure 1 As shown, a rear power take-off (PTO) device for an engine includes a housing 3 and a gear shaft 1 installed within the housing 3. The gear shaft 1 receives torque via a gear 11 at its front end and outputs torque via its rear end. A cavity is formed at the rear end of the gear shaft 1, and a first internal spline 12 for assembling a hydraulic pump input shaft is provided on the inner wall of the cavity. The PTO device also includes an output flange 2, which is fitted onto the outer side of the rear end of the gear shaft 1. The output flange 2 is fixedly connected to the gear shaft 1 and rotates synchronously with it. Therefore, the PTO device of this application can output torque either through the first internal spline 12 at the rear end of the gear shaft 1 or through the output flange 2.

[0027] When a hydraulic pump needs to be connected, the torque output of the rear power take-off device adopts an internal spline output method. Specifically, the input shaft of the hydraulic pump is inserted into the cavity at the rear end of the gear shaft 1. The external spline on the input shaft of the hydraulic pump mates with the first internal spline 12 on the gear shaft 1. The gear shaft 1 is then locked and fixed by bolts through the flange structure on the periphery of the input shaft of the hydraulic pump and the bolt holes 24 of the output flange 2 of this application. At this time, the gear shaft 1 is connected to the hydraulic pump, thereby realizing the output torque of the rear power take-off device to the hydraulic pump.

[0028] When a drive shaft needs to be connected, the torque output of the rear power take-off device adopts a flange output method. Specifically, the output flange 2 is connected to the flange structure of the drive shaft, that is, the bolts are passed through the flange structure of the drive shaft and the bolt holes 24 of the output flange 2 of this application and locked and fixed. At this time, the output flange 2 is connected to the drive shaft, thereby realizing the output torque of the rear power take-off device to the drive shaft.

[0029] There are several ways to fix the output flange 2 and the gear shaft 1. It can be locked by using a tension bolt that passes through the output flange 2 and the gear shaft 1, or it can be the structure described in this application.

[0030] like Figures 1 to 5 As shown, the output flange 2 has a hollow interior. A second internal spline 21 is provided on the inner wall of the output flange 2, and a second external spline 13 is provided on the outer wall of the gear shaft 1. The gear shaft 1 is splinedly connected to the output flange 2, achieving axial positioning of the output flange 2. A fastening nut 14 is fitted onto the rear end of the gear shaft 1. The fastening nut 14 is threadedly connected to the rear end of the gear shaft 1 and tightens the output flange 2, achieving axial positioning of the fastening nut 14.

[0031] This application uses a combination of two limiting structures to fix the output flange 2. Compared with the fixing method using tension bolts, the fixing effect of the structure in this application is better.

[0032] Specifically, such as Figure 1 , Figure 4 and Figure 5 As shown, the hollow structure inside the output flange 2 is a stepped hole, and the front end face of the fastening nut 14 abuts against the stepped surface 22 of the stepped hole. The stepped hole forms a positioning stop 13 on the connecting surface of the output flange 2. The structure of the positioning stop 13 is adapted to the positioning structure of the connecting surface of the drive shaft and the hydraulic pump. When installing the drive shaft and the hydraulic pump, they can be positioned through the positioning stop 13, which facilitates the installation of fasteners on the flange structure.

[0033] like Figure 1 As shown, the housing 3 is fitted onto the outside of the output flange 2, and an oil seal 36 is installed between the housing 3 and the output flange 2. The sealing effect is good and can prevent the lubricating oil inside the housing 3 from overflowing.

[0034] The gear shaft 1 is assembled into the housing 3 via a first bearing 31 and a second bearing 33, with the first bearing 31 and the second bearing 33 installed at intervals. A support ring 32 is fitted onto the gear shaft 1 between the first bearing 31 and the second bearing 33. Retaining rings 34 are installed between the front and rear sides of the outer ring of the first bearing 31 and the housing 3, respectively. A retaining ring 34 is installed between the front side of the outer ring of the second bearing 33 and the housing 3, and the rear side abuts against the limiting platform 35 on the inner wall of the housing 3. That is, the first bearing 31 and the second bearing 33 are positioned by the support ring 32 and the retaining rings 34. The inner wall of the housing 3 has multiple mounting grooves adapted to the structure of the retaining rings 34.

[0035] The rear power take-off (PTO) device of this invention features a cavity with internal splines at the rear end of the gear shaft for assembling the hydraulic pump input shaft, and an output flange fixed at the rear end of the gear shaft for connection with the flange structure of the drive shaft. This structure can meet the needs of different output methods, enabling the rear PTO device to output torque to the hydraulic pump or drive shaft without disassembling or replacing parts, thus possessing versatility and effectively reducing costs.

[0036] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0037] In the description of this specification, unless otherwise expressly defined, the terms "setup", "installation", "connection", etc. should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in combination with the specific content of the technical solution.

[0038] While specific embodiments of this utility model have been described above, those skilled in the art should understand that the described embodiments are merely some, not all, embodiments of this utility model. These are merely illustrative examples, and the scope of protection of this utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model and without any inventive effort, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rear power take-off device for an engine, comprising a housing and a gear shaft mounted within the housing, characterized in that, The rear end of the gear shaft is provided with a cavity, and the inner wall of the cavity is provided with a first internal spline for assembling the hydraulic pump input shaft. The rear power take-off device also includes an output flange, which is fitted onto the outer side of the rear end of the gear shaft. The output flange is fixedly connected to the gear shaft and rotates synchronously with the gear shaft.

2. The engine rear power take-off device according to claim 1, characterized in that, The output flange has a hollow interior, and a second internal spline is provided on the inner wall of the output flange. A second external spline is provided on the outer wall of the gear shaft, and the gear shaft is connected to the output flange via the external spline.

3. The engine rear power take-off device according to claim 2, characterized in that, A fastening nut is fitted onto the rear end of the gear shaft, and the fastening nut is threadedly connected to the rear end of the gear shaft and tightens the output flange.

4. The engine rear power take-off device according to claim 3, characterized in that, The hollow structure inside the output flange is a stepped hole, and the front end face of the fastening nut is pressed against the stepped surface of the stepped hole.

5. The engine rear power take-off device according to claim 4, characterized in that, The stepped hole forms a positioning stop on the connection surface of the output flange, and the structure of the positioning stop is adapted to the positioning structure of the connection surface of the drive shaft and the hydraulic pump.

6. The engine rear power take-off device according to claim 1, characterized in that, The housing is fitted onto the outside of the output flange, and an oil seal is installed between the housing and the output flange.

7. The engine rear power take-off device according to any one of claims 1 to 6, characterized in that, The gear shaft is assembled in the housing via a first bearing and a second bearing, with the first bearing and the second bearing installed at an interval.

8. The engine rear power take-off device according to claim 7, characterized in that, A support ring is fitted onto the gear shaft between the first bearing and the second bearing.

9. The engine rear power take-off device according to claim 7, characterized in that, The first bearing outer ring has retaining rings installed between its front and rear sides and the housing, and the second bearing outer ring has a retaining ring installed between its front side and the housing, and its rear side abuts against the limiting platform on the inner wall of the housing.

10. The engine rear power take-off device according to claim 9, characterized in that, The inner wall of the housing is provided with multiple mounting grooves that are adapted to the retaining ring structure.

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