Segmented mobile drive and method of controlling the same

Abstract

This invention discloses a segmented movable transmission device and its control method. The device includes: a cover plate, a housing, an upper end bearing, a movable transmission shaft, and an outer transmission shaft. The housing is configured as a sleeve structure with one open end and a shaft tail sealing hole on the other end. The outer transmission shaft includes an integrally structured transmission part and a drive shaft. The transmission part is a sleeve structure with one open end. The outer transmission shaft passes through the shaft tail sealing hole of the housing with its drive shaft, and its transmission part is placed inside the sleeve of the housing. The transmission part of the outer transmission shaft and the housing form an annular cavity. The movable transmission shaft includes an integrally structured shaft. A spring is fitted onto the shaft body of the movable drive shaft at the end of the outer drive shaft and the disc-shaped shaft. The movable drive shaft and the spring are integrally nested and installed within the drive section of the outer drive shaft. An upper end face bearing, through its central through-hole, is fitted onto the shaft body of the movable drive shaft and fixedly connected to the open end face of the drive section of the outer drive shaft. This forms an oil cavity P1 through the upper end face bearing, the outer drive shaft, and the movable drive shaft, and an oil cavity P2 is formed between the disc-shaped shaft ends of the outer drive shaft and the movable drive shaft. A cover plate, through its through-hole, is fitted onto the shaft body of the movable drive shaft and fixedly connected to the open end face of the housing. This invention solves the problem that existing fixed spline shafts in gear pumps cannot meet the requirements of staged oil supply.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of gear pump technology, and particularly to a segmented movable transmission device and its control method. Background Technology

[0002] Splined shafts, as the main components for transmitting torque and driving the rotation of fuel pumps, have advantages such as compact structure, easy installation, good centering, and high power density, and are widely used in aviation fuel pumps.

[0003] As a positive displacement fuel pump used in aviation, the flow rate of the gear pump can only be adjusted by the speed. This fuel supply characteristic causes a lot of power waste when the speed is high and the flow rate is low. In order to realize on-demand fuel supply, the idea of ​​multi-stage gear staged fuel supply has been proposed, but the existing fixed spline shaft is difficult to meet the needs of staged fuel supply. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides a segmented movable transmission device and its control method to solve the problem that the existing fixed spline shaft in the gear pump cannot meet the needs of staged oil supply.

[0005] The technical solution of the present invention: In a first aspect, the present invention provides a segmented movable transmission device and its control method, comprising: a cover plate 1, a housing 3, an upper end bearing 11, a movable transmission shaft 13, and an outer transmission shaft 14;

[0006] The housing 3 is configured as a sleeve structure with one end open and a shaft tail sealing hole provided on the other end face; the external drive shaft 14 includes a transmission part and a drive shaft of integral structure. The transmission part is a sleeve structure with one end open. The external drive shaft 14 passes through the shaft tail sealing hole of the housing 3 with its drive shaft, and its transmission part is placed inside the sleeve of the housing 3. The transmission part of the external drive shaft 14 and the housing 1 form an annular cavity.

[0007] The movable transmission shaft 13 includes an integral shaft body and a disc-shaped shaft end. A spring 12 is sleeved on the shaft body of the movable transmission shaft 13. The movable transmission shaft 13 and the spring 12 are integrally nested and installed in the transmission part of the outer transmission shaft 14. The upper end face bearing 11 is fitted into the shaft body of the movable transmission shaft 13 through its central through hole and is fixedly connected to the open end face of the transmission part of the outer transmission shaft 14. The upper end face bearing 11, the outer transmission shaft 14 and the movable transmission shaft 13 form an oil cavity P1, and the outer transmission shaft 14 and the disc-shaped shaft end of the movable transmission shaft 13 form an oil cavity P2. The cover plate 1 is fitted into the shaft body of the movable transmission shaft 13 through its through hole and is fixedly connected to the open end face of the housing 3.

[0008] Optionally, in the segmented movable transmission device described above,

[0009] The shell 3 has multiple threaded holes, a straight pipe joint threaded hole, a straight pipe joint sealing ring groove, a shaft tail sealing hole, a shaft tail sealing ring groove, a shaft tail hole elastic retaining ring groove, and two retaining ring grooves located on the upper and middle parts of the inner side wall of the shell 3, along the circumferential direction of the open end face. The multiple threaded holes are fixedly connected to the cover plate 1.

[0010] Optionally, the segmented movable transmission device described above further includes: a straight pipe joint 10 and a sealing ring B9;

[0011] The housing 3 is fitted with a straight pipe connector 10 through a straight pipe connector threaded hole and a straight pipe connector sealing ring groove, which is used to introduce high-pressure oil into the annular cavity between the housing 3 and the outer drive shaft 14 through the pipe connector 10; a sealing ring B9 is installed between the straight pipe connector 10 and the straight pipe connector sealing ring groove.

[0012] The outer drive shaft 14 has multiple oil passage holes along its circumferential direction on the end face of the drive section connected to the drive shaft, which are used to introduce high-pressure oil from the annular cavity into the P2 oil cavity of the outer drive shaft 14.

[0013] Optionally, the segmented movable transmission device described above further includes: a shaft tail sealing structure 16, a sealing ring C17, and a retaining ring C18.

[0014] The shaft tail sealing structure 16, sealing ring C17, and retaining ring C18 are installed through one shaft tail sealing hole, one shaft tail sealing ring groove, and one shaft tail hole with corresponding elastic retaining ring groove.

[0015] Optionally, the segmented movable transmission device described above further includes: a labyrinth seal structure 6, a retaining ring A5, a retaining ring B8, and a sealing ring A7.

[0016] The labyrinth sealing structure 6 is configured as an annular sleeve structure, with retaining rings A5 and B8 respectively installed through two retaining ring grooves set in the upper and middle parts of the inner sidewall of the housing 3; and the labyrinth sealing structure 6 is installed between retaining rings A5 and B8, and a sealing ring A7 is installed between the labyrinth sealing structure 6 and the inner sidewall of the housing 3.

[0017] The labyrinth sealing structure 6 works in conjunction with the housing 3 and the external drive shaft 14 to isolate the P1 oil chamber at the spring 12 from the housing and the P2 oil chamber, ensuring the control effect of the oil in the P2 oil chamber on the movable drive shaft 13.

[0018] Optionally, the segmented movable transmission device described above further includes: a lower end face bearing 15;

[0019] A lower end face bearing 15 is sleeved and installed between the inner end face of the housing 3 and the bottom end face of the transmission part of the outer drive shaft 14.

[0020] The lower end face bearing 15 includes an axial bearing and a radial bearing, which are used to provide axial and radial support for the external drive shaft 14.

[0021] Optionally, in the segmented movable transmission device described above,

[0022] The segmented movable transmission device is used to generate a downward force on the movable transmission shaft 13 through the spring 12, and drive the movable transmission shaft 13 to move downward under the action of the spring force and the pressure of the oil chamber P1.

[0023] The segmented movable transmission device is also used to drive the movable transmission shaft 13 upward through the P1 oil chamber and P2 oil chamber formed by the division of the inner cavity of the transmission part in the outer transmission shaft 14 under the movable transmission shaft 13. The oil pressure in the P2 oil chamber pushes the movable transmission shaft 13 to move upward until it is balanced with the spring force and the oil pressure in the P1 oil chamber.

[0024] Optionally, in the segmented movable transmission device described above,

[0025] The process by which the spring force and the oil pressure in the P1 oil chamber reach equilibrium is as follows:

[0026] After the high-pressure oil flows into the inner cavity of the housing 3 through the pipe joint 10, it enters the P2 oil chamber of the outer drive shaft 14 through the oil passage at the bottom of the outer drive shaft 14, pushing the movable drive shaft 13 to move upward. When the movable drive shaft 13 needs to move downward, the pressure of the P2 oil chamber is reduced, and the movable drive shaft 13 moves downward under the action of the spring force and the oil pressure of the P1 oil chamber. During this process, the spring force gradually decreases until the spring force + the oil pressure of the P1 oil chamber is balanced with the pressure of the P2 oil chamber. When the movable drive shaft 13 needs to move upward, the pressure of the P2 oil chamber is increased, and the movable drive shaft 13 moves upward. During this process, the spring force gradually increases until the spring force + the oil pressure of the P1 oil chamber is balanced with the oil pressure of the P2 oil chamber.

[0027] Secondly, embodiments of the present invention also provide a control method for a segmented movable transmission device, wherein the control method is executed using the segmented movable transmission device as described in any of the above claims, comprising:

[0028] Step 1: Based on the segmented control requirements, confirm the desired travel distance L of the movable drive shaft 13;

[0029] Step 2: Calculate the high-pressure oil pressure P2 in the control oil chamber P2 based on the expected moving distance L of the movable transmission shaft 13.

[0030] Step 3: Based on the calculated high-pressure oil pressure P2 of the control oil chamber P2, adjust the oil pressure input to the control oil chamber P2 through the straight pipe connector 10.

[0031] Optionally, in the control method of the segmented movable transmission device described above, step 2 includes:

[0032] Set the installation height of spring 12 to the free height, and the spring force Ft to 0;

[0033] When the moving distance of the movable drive shaft 13 is set to L, the spring compression length is also L;

[0034] When the movable drive shaft 13 is required to move upward by L, the oil pressure P2 in the control oil chamber P2 is calculated by the following formula:

[0035] P2×S2=P1×S1+K×L, then P2=(P1×S1+K×L) / S2;

[0036] Wherein, P1 is the return oil pressure of the gear pump, which is a constant value; S1 is the area of ​​action of the oil pressure in P1 along the vertical direction; S2 is the area of ​​action of the oil pressure in the P2 cavity along the vertical direction; and the spring force Ft = K × L.

[0037] The beneficial effects of the present invention: The embodiments of the present invention provide a segmented movable transmission device and its control method. The segmented movable transmission device is suitable for gear pumps with different oil supply requirements under different working conditions. The device has a simple structure, strong sealing performance, and is easy to implement. By using this transmission device, the transmission efficiency of the gear pump can be improved, and the position of the movable transmission shaft can be controlled according to the pressure of the high-pressure oil. In the structure of this segmented movable transmission device, the traditional transmission shaft is divided into two parts: an external transmission shaft and a movable transmission shaft. Its working principle is as follows: After high-pressure oil flows through the pipe joint 10 into the inner cavity of the housing 3, it enters the P2 oil chamber of the external transmission shaft 14 through the oil passage at the bottom of the external transmission shaft 14, pushing the movable transmission shaft 13 upwards. When the movable transmission shaft 13 needs to move downwards, the pressure in the P2 oil chamber is reduced, and the movable transmission shaft 13 moves downwards under the action of the spring force and the oil pressure in the P1 oil chamber. During this process, the spring force gradually decreases until the spring force + the oil pressure in the P1 oil chamber balances the pressure force in the P2 oil chamber. When the movable transmission shaft 13 needs to move upwards, the pressure in the P2 oil chamber is increased, and the movable transmission shaft 13 moves upwards. During this process, the spring force gradually increases until the spring force + the oil pressure in the P1 oil chamber balances the oil pressure force in the P2 oil chamber.

[0038] In addition, the upper end face bearing 11 and the cover plate 1 connected to the outer drive shaft 14 together restrict the upward movement of the outer drive shaft 14; the labyrinth seal 6 and the shaft tail seal prevent the high-pressure oil entering the housing 3 from leaking, ensuring the overall sealing performance of the structure, and also serving as a radial bearing to support the outer drive shaft 14. The plane of the cover plate 1 in contact with the upper end face bearing 11 forms an end face friction pair, ensuring that the rotation of the outer drive shaft is not affected. Attached Figure Description

[0039] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0040] Figure 1 This is a schematic diagram of the overall structure of a segmented movable transmission device provided in an embodiment of the present invention;

[0041] Figure 2 for Figure 1 The figure shown is an outline view of the segmented movable transmission device provided in an embodiment of the present invention.

[0042] Figure 3 for Figure 1 The diagram shown is a structural schematic of the housing in the segmented movable transmission device provided in this embodiment of the invention.

[0043] Figure 4 for Figure 1 The image shown is a top view of the upper end bearing in the segmented movable transmission device provided in this embodiment of the invention.

[0044] Figure 5 for Figure 1 The image shown is a bottom view of the outer drive shaft in the segmented movable transmission device provided in this embodiment of the invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1-Cover plate; 2-Screw A; 3-Housing; 4-Screw B; 5-Retaining ring A; 6-Labyrinth seal structure; 7-Sealing ring A; 8-Retaining ring B; 9-Sealing ring B; 10-Straight pipe connector; 11-Upper end face bearing; 12-Spring; 13-Movable drive shaft; 14-Outer drive shaft; 15-Lower end face bearing; 16-Shaft tail seal structure; 17-Sealing ring C; 18-Retaining ring C. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0048] As explained in the background section, during the operation of a gear pump, the engine's oil supply demand varies depending on the engine's operating state, necessitating adjustment of the gear pump's oil supply. Therefore, the design concept of multi-stage gear-based graded oil supply was proposed. However, existing splined shafts and components have dynamic sealing structures; directly moving the splined shaft up and down would compromise the overall sealing of the device. In other words, existing fixed splined shafts cannot meet the requirements of graded oil supply.

[0049] To address the aforementioned problems and the need for graded oil supply in gear pumps, this invention proposes a segmented movable transmission device and its control method by improving upon the traditional fixed transmission shaft.

[0050] The segmented movable drive shaft device provided by this invention can autonomously adjust the working range of the spline shaft according to different high-pressure oil inflows. While ensuring the device's sealing, it achieves the movable working requirement of the spline shaft, thereby meeting the oil supply needs of the gear pump under different engine conditions. This segmented movable drive shaft device has a simple structure, strong sealing performance, and is easy to implement; it not only meets the basic working requirements of the spline shaft but also autonomously adjusts its working range according to the oil supply needs under different pressures, thus regulating the oil supply of the gear pump.

[0051] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0052] Figure 1 This is a schematic diagram of the overall structure of a segmented movable transmission device provided in an embodiment of the present invention. Figure 2 for Figure 1 The diagram shows the external appearance of the segmented movable transmission device provided in an embodiment of the present invention. (Refer to...) Figure 1 and Figure 2 As shown, the main structure of the segmented movable transmission device provided in this embodiment of the invention includes: a cover plate 1, a housing 3, an upper end bearing 11, a movable transmission shaft 13, and an outer transmission shaft 14.

[0053] like Figures 1 to 3 In the structure of the segmented movable transmission device shown, the housing 3 is configured as a sleeve structure with one end open and a shaft tail sealing hole provided on the other end face; the outer transmission shaft 14 includes a transmission part and a drive shaft of integral structure. The transmission part is a sleeve structure with one end open. The outer transmission shaft 14 passes through the shaft tail sealing hole of the housing 3 with its drive shaft, and its transmission part is placed inside the sleeve of the housing 3. The transmission part of the outer transmission shaft 14 and the housing 1 form an annular cavity.

[0054] The movable transmission shaft 13 in this embodiment of the invention includes an integral shaft body and a disc-shaped shaft end. A spring 12 is sleeved on the shaft body of the movable transmission shaft 13. The movable transmission shaft 13 and the spring 12 are integrally nested and installed in the transmission part of the outer transmission shaft 14. The upper end face bearing 11 is fitted into the shaft body of the movable transmission shaft 13 through its central through hole and then fixedly connected to the open end face of the transmission part of the outer transmission shaft 14, so that an oil cavity P1 is formed by the upper end face bearing 11, the outer transmission shaft 14, and the movable transmission shaft 13, and an oil cavity P2 is formed between the outer transmission shaft 14 and the disc-shaped shaft end of the movable transmission shaft 13. The cover plate 1 is fitted into the shaft body of the movable transmission shaft 13 through its through hole and then fixedly connected to the open end face of the housing 3. Figure 4 As shown, Figure 1 The image shown is a top view of the upper end bearing in the segmented movable transmission device provided in this embodiment of the invention.

[0055] Figure 3 for Figure 1 The diagram shows a structural schematic of the housing in the segmented movable transmission device provided in this embodiment of the invention. Figure 3 As shown, the open end face of the housing 3 is provided with multiple threaded holes, one straight pipe joint threaded hole, one straight pipe joint sealing ring groove, one shaft tail sealing hole, one shaft tail sealing ring groove, one shaft tail hole elastic retaining ring groove, and two retaining ring grooves provided in the upper and middle parts of the inner side wall of the housing 3; the multiple threaded holes are fixedly connected to the cover plate 1.

[0056] In one implementation of this invention, based on the holes and grooves provided on the housing 3, such as... Figure 1 As shown, the segmented movable transmission device may also include: a straight pipe joint 10 and a sealing ring B9.

[0057] In this embodiment of the invention, the housing 3 is fitted with a straight pipe connector 10 through a straight pipe connector threaded hole and a straight pipe connector sealing ring groove. The straight pipe connector 10 is used to introduce high-pressure oil into the annular cavity between the housing 3 and the outer drive shaft 14. A sealing ring B9 is installed between the straight pipe connector 10 and the straight pipe connector sealing ring groove.

[0058] Multiple oil passage holes are provided circumferentially on the end face of the outer drive shaft 14 where the transmission part connects to the drive shaft. These holes are used to introduce high-pressure oil from the annular cavity into the P2 oil chamber of the outer drive shaft 14. Figure 5 As shown, Figure 1 The image shown is a bottom view of the outer drive shaft in the segmented movable transmission device provided in this embodiment of the invention.

[0059] In one implementation of this invention, such as Figure 1 As shown, the segmented movable transmission device may also include: a shaft tail sealing structure 16, a sealing ring C17, and a retaining ring C18.

[0060] In this implementation, for the shaft tail sealing structure 16 installed in the housing 3, the shaft tail sealing structure 16, sealing ring C17, and retaining ring C18 are installed correspondingly through one shaft tail sealing hole, one shaft tail sealing ring groove, and one shaft tail hole elastic retaining ring groove on the housing to achieve sealing between the drive part of the transmission shaft 14 and the housing 3.

[0061] In one implementation of this invention, such as Figure 1 As shown, the segmented movable transmission device also includes: labyrinth seal structure 6, retaining ring A5, retaining ring B8, and sealing ring A7.

[0062] In this implementation, the labyrinth sealing structure 6 is set as an annular sleeve structure, and two retaining ring grooves set in the upper and middle parts of the inner sidewall of the housing 3 are respectively installed with retaining ring A5 and retaining ring B8; and the labyrinth sealing structure 6 is installed between retaining ring A5 and retaining ring B8, and a sealing ring A7 is installed between the labyrinth sealing structure 6 and the inner sidewall of the housing 3.

[0063] The labyrinth sealing structure 6 works in conjunction with the housing 3 and the external drive shaft 14 to isolate the P1 oil chamber at the spring 12 from the housing and the P2 oil chamber, ensuring the control effect of the oil in the P2 oil chamber on the movable drive shaft 13.

[0064] In one implementation of this invention, such as Figure 1 As shown, the segmented movable transmission device also includes a lower end face bearing 15.

[0065] In this implementation, a lower end face bearing 15 is sleeved and installed between the inner end face of the housing 3 and the bottom end face of the transmission part of the outer drive shaft 14. The lower end face bearing 15 includes an axial bearing and a radial bearing, which are used to provide axial and radial support for the outer drive shaft 14.

[0066] The segmented movable transmission device provided in the above embodiments of the present invention operates as follows:

[0067] The spring 12 generates a downward force on the movable drive shaft 13, and the movable drive shaft 13 is driven to move downward under the action of the spring force and the pressure of the oil chamber P1.

[0068] In addition, through the P1 oil chamber and P2 oil chamber formed by the division of the transmission part cavity in the outer transmission shaft 14 by the movable transmission shaft 13, the oil pressure in the P2 oil chamber pushes the movable transmission shaft 13 to move upward until it is balanced with the spring force and the oil pressure in the P1 oil chamber.

[0069] It should be noted that the process of achieving equilibrium between the spring force and the oil pressure in the P1 oil chamber is as follows:

[0070] After the high-pressure oil flows into the inner cavity of the housing 3 through the pipe joint 10, it enters the P2 oil chamber of the outer drive shaft 14 through the oil passage at the bottom of the outer drive shaft 14, pushing the movable drive shaft 13 to move upward. When the movable drive shaft 13 needs to move downward, the pressure of the P2 oil chamber is reduced, and the movable drive shaft 13 moves downward under the action of the spring force and the oil pressure of the P1 oil chamber. During this process, the spring force gradually decreases until the spring force + the oil pressure of the P1 oil chamber is balanced with the pressure of the P2 oil chamber. When the movable drive shaft 13 needs to move upward, the pressure of the P2 oil chamber is increased, and the movable drive shaft 13 moves upward. During this process, the spring force gradually increases until the spring force + the oil pressure of the P1 oil chamber is balanced with the oil pressure of the P2 oil chamber.

[0071] Based on the segmented movable transmission device provided in the above embodiments of the present invention, the present invention also provides a control method for the segmented movable transmission device, wherein the control method is executed using the segmented movable transmission device provided in any of the above embodiments of the present invention, including:

[0072] Step 1: Based on the segmented control requirements, confirm the desired travel distance L of the movable drive shaft 13;

[0073] Step 2: Calculate the high-pressure oil pressure P2 in the control oil chamber P2 based on the expected moving distance L of the movable transmission shaft 13.

[0074] Step 3: Based on the calculated high-pressure oil pressure P2 of the control oil chamber P2, adjust the oil pressure input to the control oil chamber P2 through the straight pipe connector 10.

[0075] In one implementation of this invention, step 2 includes the following steps:

[0076] Set the installation height of spring 12 to the free height, and the spring force Ft to 0;

[0077] When the moving distance of the movable drive shaft 13 is set to L, the spring compression length is also L;

[0078] When the movable drive shaft 13 is required to move upward by L, the oil pressure P2 in the control oil chamber P2 is calculated by the following formula:

[0079] P2×S2=P1×S1+K×L, then P2=(P1×S1+K×L) / S2;

[0080] Wherein, P1 is the return oil pressure of the gear pump, which is a constant value; S1 is the area of ​​action of the oil pressure in P1 along the vertical direction; S2 is the area of ​​action of the oil pressure in the P2 cavity along the vertical direction; and the spring force Ft = K × L.

[0081] The segmented movable transmission device and its control method provided in this invention are applicable to gear pumps with different oil supply requirements under different working conditions. The device has a simple structure, strong sealing performance, and is easy to implement. Using this transmission device can improve the transmission efficiency of the gear pump and control the position of the movable transmission shaft according to the pressure of the high-pressure oil. In the structure of this segmented movable transmission device, the traditional transmission shaft is divided into two parts: an external transmission shaft and a movable transmission shaft. Its working principle is as follows: After high-pressure oil flows through the pipe joint 10 into the inner cavity of the housing 3, it enters the P2 oil chamber of the external transmission shaft 14 through the oil passage at the bottom of the external transmission shaft 14, pushing the movable transmission shaft 13 upwards. When the movable transmission shaft 13 needs to move downwards, the pressure in the P2 oil chamber is reduced, and the movable transmission shaft 13 moves downwards under the action of the spring force and the oil pressure in the P1 oil chamber. During this process, the spring force gradually decreases until the spring force + the oil pressure in the P1 oil chamber balances the pressure force in the P2 oil chamber. When the movable transmission shaft 13 needs to move upwards, the pressure in the P2 oil chamber is increased, and the movable transmission shaft 13 moves upwards. During this process, the spring force gradually increases until the spring force + the oil pressure in the P1 oil chamber balances the oil pressure force in the P2 oil chamber.

[0082] In addition, the upper end face bearing 11 and the cover plate 1 connected to the outer drive shaft 14 together restrict the upward movement of the outer drive shaft 14; the labyrinth seal 6 and the shaft tail seal prevent the high-pressure oil entering the housing 3 from leaking, ensuring the overall sealing performance of the structure, and also serving as a radial bearing to support the outer drive shaft 14. The plane of the cover plate 1 in contact with the upper end face bearing 11 forms an end face friction pair, ensuring that the rotation of the outer drive shaft is not affected.

[0083] The following specific implementation examples illustrate the implementation of the segmented movable transmission device and its control method provided in the embodiments of the present invention.

[0084] Implementation Example

[0085] The engine's oil supply requirements in the gear pump vary under different operating conditions, necessitating the drive shaft to move vertically to drive the multi-stage gears. To address this, this invention designs a segmented, movable transmission device. This device is simple in structure, highly sealed, and easy to implement. It not only meets the basic working requirements of the splined shaft but also autonomously adjusts its working range according to the oil supply demand under different pressures, thereby regulating the oil supply of the gear pump.

[0086] See Figures 1 to 5As shown, this embodiment provides a segmented movable transmission device, including: a cover plate 1, screw A2, housing 3, screw B4, retaining ring A5, labyrinth seal structure 6, sealing ring A7, retaining ring B8, sealing ring B9, straight pipe joint 10, upper end face bearing 11, spring 12, movable transmission shaft 13, outer transmission shaft 14, lower end face bearing 15 (axial bearing + radial bearing), shaft tail sealing structure 16, sealing ring C17, and retaining ring C18.

[0087] In this embodiment, the cover plate 1 is fitted with the upper end face bearing 11 to balance the upward load. The cover plate 1 has 8 countersunk holes evenly distributed on it and is connected to the housing 3 with 8 screws A.

[0088] The housing 3 is configured as a cylindrical structure with an opening at one end. Multiple threaded holes are evenly arranged circumferentially on the end face of the opening end, and it is connected to the cover plate 1 by screw A2.

[0089] Specifically, the open end face of the housing 3 is provided with multiple threaded holes (for fixed connection with the cover plate 1 by screw A2), one straight pipe joint threaded hole, one straight pipe joint sealing ring groove (for installing and sealing the straight pipe joint 10); one shaft tail sealing hole, one shaft tail sealing ring groove, one shaft tail hole elastic retaining ring groove (for installing the sealing structure between the external drive shaft 14 and the housing 3), and two retaining ring grooves provided in the upper and middle parts of the inner side wall of the housing 3 (for installing retaining ring A5 and retaining ring B8 respectively, thereby fixing the labyrinth sealing structure 6 by the two retaining rings).

[0090] The eight threaded holes in housing 3 are used for connection with screw A and cover plate 1;

[0091] One threaded hole for a straight pipe connector in housing 3 is used to connect to straight pipe connector 10;

[0092] One straight-through pipe joint sealing ring groove in housing 3 is used in conjunction with sealing ring B;

[0093] One shaft tail seal groove in housing 3 is used in conjunction with seal ring C;

[0094] One of the shaft tail holes in housing 3 is equipped with an elastic retaining ring groove, which is used in conjunction with retaining ring C;

[0095] The two retaining ring grooves in the inner wall of the housing 3 are used in conjunction with retaining ring A and retaining ring B respectively. The two retaining rings fix the labyrinth sealing structure 6 together. The labyrinth sealing structure 6 is an annular sealing structure. The annular inner wall of the labyrinth sealing structure 6 is provided with multiple grooves, which cooperate with the outer drive shaft 14 for sealing.

[0096] The shaft tail sealing hole in housing 3 works in conjunction with the shaft tail sealing structure 16 to seal the high-pressure oil in the P2 oil chamber.

[0097] Screw B4 is used in conjunction with 10 threaded holes evenly distributed on the outer drive shaft 14 to fix the upper end bearing 11 and the outer drive shaft 14, and at the same time to install the spring 12 and the movable drive shaft 13, forming the spring oil chamber P1.

[0098] The oil supply to the P2 chamber is as follows: high-pressure oil enters the annular cavity between the housing 3 and the external drive shaft 14 through the pipe joint 10, and enters the P2 oil chamber of the external drive shaft 14 through the oil passage hole on the end face of the external drive shaft 14.

[0099] The oil in chamber P1 comes from the gear pump that works with the movable drive shaft 13. The oil enters chamber P1 through the spline of 13 and the oil passage hole on 11. There is an oil pressure difference on both sides of the end face of 13. By controlling the pressure of the high-pressure oil in chamber P2, axial movement of 13 is driven.

[0100] The labyrinth seal structure 6 works in conjunction with the housing 3 and the external drive shaft 14 to isolate the P1 oil chamber at the spring 12 from the housing and the P2 oil chamber, ensuring the control effect of the oil in the P2 oil chamber on the movable drive shaft 13.

[0101] The straight pipe connector 10 is a screw-in type pipe connector, which is installed on the housing 3 by threaded connection, and high-pressure oil is supplied to the inner cavity of the housing 3 to form the P2 oil chamber.

[0102] The upper end bearing 11 is fastened to the outer drive shaft 14 by screw B4, and the upper end bearing 11 rotates synchronously at high speed under the drive of the outer drive shaft 14.

[0103] Spring 12 exerts a downward force on the movable drive shaft 13, and under the action of the spring force and the pressure of the oil chamber P1, it drives the movable drive shaft 13 to move downward.

[0104] In specific implementation, the outer drive shaft 14 is provided with 10 threaded holes, 18 oil passage holes, 3 movable slides, and 1 external spline; the 10 threaded holes in the outer drive shaft 14 are connected to the upper end face bearing 11 by screw B4; the 18 oil passage holes in the outer drive shaft 14 are used to pass high pressure oil in the inner cavity of the housing 3 into the oil cavity of the outer drive shaft P2; the 3 movable slides in the outer drive shaft 14 are used in conjunction with the movable drive shaft 13 to allow the movable drive shaft 13 to move up and down within it.

[0105] The inner cavity of the outer drive shaft 14, divided by the movable drive shaft 13, forms oil chambers P1 and P2. The oil pressure in oil chamber P2 pushes the movable drive shaft 13 upward until it reaches equilibrium with the spring force and the oil pressure in oil chamber P1. The external spline in the outer drive shaft 14 is used to connect to the internal spline of the casing and transmit torque.

[0106] The lower end bearing 15 is used to bear the downward load of the outer drive shaft 14. The shaft tail seal 16 is used to seal the shaft tail to prevent oil in the P2 oil chamber from leaking from the shaft tail;

[0107] The sealing ring C17 is used in conjunction with the shaft tail sealing ring groove in the housing 3 to seal the outer ring of the shaft tail seal 16; the retaining ring C18 is used to fix the shaft tail seal.

[0108] In this implementation example, the calculation method for the extension length of the movable drive shaft 13 and the high-pressure oil source pressure is as follows:

[0109] like Figure 1 As shown, the installation height of spring 12 is at its free height, and the spring force Ft is 0. Assume: the moving distance of the movable drive shaft 13 is L, then the spring compression length is also L (unit: mm); P1 is the gear pump return oil pressure, a constant value (unit: MPa); S1 is the area (annular area) of the P1 oil pressure acting vertically (unit: mm). 2 S2 represents the vertical area of ​​the oil pressure within cavity P2, expressed in mm². 2 P2 is the pressure in the control oil chamber P2, in MPa; K is the spring constant, in N / mm. According to Hooke's Law, the spring force Ft = K × L. If the movable drive shaft 13 needs to move upward by L mm, the oil pressure P2 in the P2 chamber is calculated by the following formula: P2 × S2 = P1 × S1 + K × L, then P2 = (P1 × S1 + K × L) / S2.

[0110] The oil pressure P2 of the high-pressure oil in the control chamber P2 can then be calculated based on the expected travel distance L of the movable drive shaft 13.

[0111] In this implementation example, the function of the sealing structure at each location is as follows:

[0112] Sealing ring A7: Prevents oil from entering through straight pipe joint 10. Figure 1 The image shows a leak above.

[0113] Sealing ring B9: Prevents oil from leaking into the atmosphere from the straight pipe joint 10.

[0114] Sealing ring C17: Prevents oil from the straight pipe joint 10 from leaking into the atmosphere through the shaft tail seal 16.

[0115] Shaft tail seal structure 16: The elastic material of its inner ring is used to hold the journal of the outer drive shaft 14 to form a seal, preventing oil from the straight pipe joint 10 from leaking into the atmosphere.

[0116] Labyrinth seal structure 6: Its inner ring has densely packed micro-grooves, forming a labyrinth + clearance fit with the outer drive shaft 14, preventing oil from the pipe joint 10 from entering the pipe. Figure 1 The above shows a slight leak (a small amount of leakage, but it does not affect the oil pressure in oil chambers P1 and P2).

[0117] Specifically, the functions of retaining rings A5 and B8 are as follows:

[0118] Retaining rings A5 and B8 are used to limit the installation position of the labyrinth seal 6 and prevent it from moving up and down.

[0119] This implementation example provides a method for using the segmented movable drive shaft device:

[0120] 1) After assembling the external drive shaft, movable drive shaft, spring, and upper end face bearing in their respective positions, fasten the upper end face bearing to the external drive shaft with screws;

[0121] 2) Install the assembled drive shaft and lower end bearing into the housing, seal with labyrinth seal and shaft tail seal, then fasten the cover plate to the housing with bolts, and assemble the pipe joint.

[0122] 3) Install the assembled segmented movable transmission shaft device into the gear pump, connect the external spline to the test bench, connect the pipe joint to the high-pressure oil pipeline, and connect each inlet and outlet of the gear pump to the corresponding inlet and outlet pipelines.

[0123] 4) During the operation of the gear pump, the external drive shaft rotates under the drive of the test bench, driving the movable drive shaft, which in turn drives the gear at the other end of the movable drive shaft to rotate. When the drive shaft needs to move downward, the pressure in the high-pressure oil line is reduced, causing the pressure inside the external drive shaft to drop, driving the movable drive shaft to move downward. During this process, the spring force gradually decreases until the spring force and hydraulic pressure are balanced, allowing the drive shaft to move downward to the designated position. When the drive shaft needs to move upward, the pressure in the high-pressure oil line is increased, causing the pressure inside the external drive shaft to rise, driving the movable drive shaft to move upward. During this process, the spring force gradually increases until the spring force and hydraulic pressure are balanced, allowing the drive shaft to move downward to the designated position.

[0124] The working principle of the segmented movable drive shaft device provided in this embodiment is as follows: After the high-pressure oil flows into the inner cavity of the housing 3 through the pipe joint 10, it enters the P2 oil cavity of the outer drive shaft 14 through the oil passage at the bottom of the outer drive shaft 14, pushing the movable drive shaft 13 to move upward; when the movable drive shaft 13 needs to move downward, the pressure of the P2 oil cavity is reduced, and the movable drive shaft 13 moves downward under the action of the spring force and the oil pressure of the P1 oil cavity. During this process, the spring force gradually decreases until the spring force + the oil pressure of the P1 oil cavity is balanced with the pressure of the P2 oil cavity; when the movable drive shaft 13 needs to move upward, the pressure of the P2 oil cavity is increased, and the movable drive shaft 13 moves upward. During this process, the spring force gradually increases until the spring force + the oil pressure of the P1 oil cavity is balanced with the oil pressure of the P2 oil cavity.

[0125] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A segmented movable transmission device, characterized in that, include: Cover plate (1), housing (3), upper end bearing (11), movable drive shaft (13), outer drive shaft (14). The housing (3) is configured as a sleeve structure with one end open and a shaft tail sealing hole provided on the other end face; the external drive shaft (14) includes a transmission part and a drive shaft of integral structure. The transmission part is a sleeve structure with one end open. The external drive shaft (14) passes through the shaft tail sealing hole of the housing (3) with its drive shaft. Its transmission part is placed inside the sleeve of the housing (3), and the transmission part of the external drive shaft (14) and the housing (3) form an annular cavity; The movable drive shaft (13) includes an integral shaft body and a disc-shaped shaft end. A spring (12) is sleeved on the shaft body of the movable drive shaft (13). The movable drive shaft (13) and the spring (12) are integrally nested and installed in the transmission part of the outer drive shaft (14). The upper end face bearing (11) is fitted into the shaft body of the movable drive shaft (13) through its central through hole and then fixedly connected to the open end face of the transmission part of the outer drive shaft (14). The upper end face bearing (11), the outer drive shaft (14) and the movable drive shaft (13) form an oil cavity P1, and the outer drive shaft (14) and the movable drive shaft (13) form an oil cavity P2 through the middle of the disc-shaped shaft end of the outer drive shaft (14) and the movable drive shaft (13). The cover plate (1) is fitted into the shaft body of the movable drive shaft (13) through its through hole and then fixedly connected to the open end face of the housing (3). The segmented movable transmission device further includes: a straight pipe joint (10) and a sealing ring B (9). The housing (3) is fitted with a straight pipe connector (10) through a straight pipe connector threaded hole and a straight pipe connector sealing ring groove, which is used to introduce high pressure oil into the annular cavity between the housing (3) and the outer drive shaft (14) through the pipe connector (10); a sealing ring B (9) is installed between the straight pipe connector (10) and the straight pipe connector sealing ring groove. The outer drive shaft (14) has multiple oil passage holes along the circumferential direction on the end face of the drive section connected to the drive shaft, which are used to introduce high-pressure oil from the annular cavity into the P2 oil cavity of the outer drive shaft (14).

2. The segmented movable transmission device according to claim 1, characterized in that, The shell (3) has multiple threaded holes, a straight pipe joint threaded hole, a straight pipe joint sealing ring groove, a shaft tail sealing hole, a shaft tail sealing ring groove, a shaft tail hole elastic retaining ring groove, and two retaining ring grooves provided on the upper and middle parts of the inner side wall of the shell (3); the multiple threaded holes are fixedly connected to the cover plate (1).

3. The segmented movable transmission device according to claim 2, characterized in that, It also includes: shaft tail seal structure (16), seal ring C (17), retaining ring C (18); The shaft tail sealing structure (16), sealing ring C (17), and retaining ring C (18) are installed through one shaft tail sealing hole, one shaft tail sealing ring groove, and one shaft tail hole with corresponding elastic retaining ring groove.

4. The segmented movable transmission device according to claim 2, characterized in that, Also includes: Labyrinth sealing structure (6), retaining ring A (5), retaining ring B (8), sealing ring A (7); The labyrinth sealing structure (6) is configured as an annular sleeve structure, with two retaining ring grooves provided on the upper and middle parts of the inner wall of the shell (3) respectively for installing retaining ring A (5) and retaining ring B (8); and the labyrinth sealing structure (6) is installed between retaining ring A (5) and retaining ring B (8), and a sealing ring A (7) is installed between the labyrinth sealing structure (6) and the inner wall of the shell (3). The labyrinth sealing structure (6) works together with the housing (3) and the external drive shaft (14) to isolate the P1 oil chamber at the spring (12) from the housing and the P2 oil chamber, ensuring the control effect of the oil in the P2 oil chamber on the movable drive shaft (13).

5. A segmented movable transmission device according to claim 1, characterized in that, Also includes: Lower end face bearing (15); A lower end face bearing (15) is sleeved and installed between the inner end face of the housing (3) and the bottom end face of the transmission part of the outer drive shaft (14). The lower end face bearing (15) includes an axial bearing and a radial bearing, which are used to provide axial and radial support for the external drive shaft (14).

6. A segmented movable transmission device according to any one of claims 1 to 5, characterized in that, The segmented movable transmission device is used to generate a downward force on the movable transmission shaft (13) through the spring (12), and drive the movable transmission shaft (13) to move downward under the action of the spring force and the pressure of the oil chamber of P1. The segmented movable transmission device is also used to form oil chambers P1 and P2 in the inner cavity of the transmission part of the outer transmission shaft (14) under the division of the movable transmission shaft (13). The oil pressure in the P2 oil chamber pushes the movable transmission shaft (13) to move upward until it is balanced with the spring force and the oil pressure in the P1 oil chamber.

7. A segmented movable transmission device according to claim 6, characterized in that, The process by which the spring force and the oil pressure in the P1 oil chamber reach equilibrium is as follows: After the high-pressure oil flows through the pipe joint (10) into the inner cavity of the housing (3), it enters the P2 oil cavity of the outer drive shaft (14) through the oil passage at the bottom of the outer drive shaft (14), pushing the movable drive shaft (13) to move upward. When the movable drive shaft (13) needs to move downward, the pressure of the P2 oil cavity is reduced, and the movable drive shaft (13) moves downward under the action of the spring force and the oil pressure of the P1 oil cavity. During this process, the spring force gradually decreases until the spring force + the oil pressure of the P1 oil cavity is balanced with the pressure of the P2 oil cavity. When the movable drive shaft (13) needs to move upward, the pressure of the P2 oil cavity is increased, and the movable drive shaft (13) moves upward. During this process, the spring force gradually increases until the spring force + the oil pressure of the P1 oil cavity is balanced with the oil pressure of the P2 oil cavity.

8. A control method for a segmented movable transmission device, characterized in that, The control method employs the segmented movable transmission device as described in any one of claims 1 to 7, comprising: Step 1: Based on the segmented control requirements, confirm the expected travel distance L of the movable drive shaft (13); Step 2: Calculate the high-pressure oil pressure P2 in the control P2 oil chamber based on the expected moving distance L of the movable transmission shaft (13); Step 3: Based on the calculated high pressure P2 of the control P2 oil chamber, adjust the oil pressure P2 input to the control P2 oil chamber through the straight pipe connector (10).

9. The control method for the segmented movable transmission device according to claim 8, characterized in that, Step 2 includes: Set the installation height of spring (12) to the free height, and the spring force Ft to 0; When the moving distance of the movable drive shaft (13) is set to L, the compression length of the spring is also L; When the movable drive shaft (13) is required to move upward by L, the oil pressure P2 in the control oil chamber P2 is calculated by the following formula: P2×S2=P1×S1+ K×L, then P2=(P1×S1+ K×L) / S2; Wherein, P1 is the return oil pressure of the gear pump, which is a constant value; S1 is the area of ​​action of the P1 oil pressure in the vertical direction; S2 is the area of ​​action of the P2 oil pressure in the P2 oil chamber in the vertical direction; and the spring force Ft = K × L.

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