Sectional type movable transmission device and control method thereof

Abstract

The embodiment of the invention discloses a sectional type movable transmission device and a control method thereof. The sectional type movable transmission device comprises a cover plate, a shell, an upper end face bearing, a movable transmission shaft and an outer transmission shaft. The shell is of a sleeve structure with one end open, and a shaft tail sealing hole is formed in the other end face. The outer transmission shaft comprises a transmission part and a driving shaft which are of an integrated structure, the transmission part is of a sleeve structure with an opening in one end, the outer transmission shaft and the driving shaft of the outer transmission shaft penetrate through the shaft tail sealing hole of the shell, the transmission part of the outer transmission shaft is arranged in a sleeve of the shell, and the transmission part of the outer transmission shaft and the shell 1 form an annular cavity; the movable transmission shaft comprises a shaft body portion and a disc-shaped shaft end portion which are of an integrated structure, the shaft body portion of the movable transmission shaft is sleeved with a spring, the movable transmission shaft and the spring are integrally installed in a transmission portion of the outer transmission shaft in a nested mode, and the upper end face bearing is sleeved on the shaft body portion of the movable transmission shaft through a center through hole of the upper end face bearing. The upper end face bearing is fixedly connected to the opening end face of the transmission part of the outer transmission shaft, so that an oil cavity P1 is formed through the upper end face bearing, the outer transmission shaft and the movable transmission shaft, and an oil cavity P2 is formed between the outer transmission shaft and the disc-shaped shaft end of the movable transmission shaft; the cover plate is fixedly connected to the opening end face of the shell after being sleeved with the shaft body part of the movable transmission shaft through the via hole of the cover plate. According to the technical scheme, the problem that an existing fixed spline shaft in a gear pump is difficult to meet the requirement for graded oil supply is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gear pumps but is not limited thereto, and in particular to a segmented movable transmission device and a control method thereof. Background Art

[0002] As the main component for transmitting torque and driving the fuel pump to rotate, the spline shaft has the advantages of compact structure, easy installation, good centering, and high transmission power density. It is widely used in aviation fuel pumps.

[0003] As a positive displacement fuel pump for 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 at high speed and low flow rate. In order to achieve on-demand fuel supply, the idea of ​​multi-stage gear graded fuel supply has been proposed, but the existing fixed spline shaft is difficult to meet the needs of graded fuel supply. Summary of the invention

[0004] Purpose of the present invention: In order to solve the above technical problems, an embodiment of the present invention provides a segmented movable transmission device and a control method thereof to solve the problem that the existing fixed spline shaft in the gear pump is difficult to meet the demand for graded oil supply.

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

[0006] The housing 3 is configured as a sleeve structure with an opening at one end, and a shaft tail sealing hole is provided on the other end surface; the outer transmission shaft 14 includes a transmission part and a drive shaft of an integrated structure, and the transmission part is a sleeve structure with an opening at one end, and 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 in the sleeve of the housing 3, and the transmission part of the outer transmission shaft 14 and the housing 1 form an annular cavity;

[0007] The movable transmission shaft 13 includes an integrally structured shaft body and a disc-shaped shaft end portion, a spring 12 is sleeved on the shaft body portion of the movable transmission shaft 13, and the movable transmission shaft 13 and the spring 12 are integrally nested and installed in the transmission portion of the outer transmission shaft 14, and the upper end face bearing 11 is sleeved on the shaft body portion of the movable transmission shaft 13 through its central through hole, and then fixedly connected to the open end face of the transmission portion of the outer transmission shaft 14, so as to form a P1 oil chamber through the upper end face bearing 11, the outer transmission shaft 14 and the movable transmission shaft 13, and form a P2 oil chamber between the outer transmission shaft 14 and the disc-shaped shaft end portion of the movable transmission shaft 13; the cover plate 1 is fixedly connected to the open end face of the shell 3 after being sleeved on the shaft body portion of the movable transmission shaft 13 through its through hole.

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

[0009] The opening end surface of the shell 3 is circumferentially provided with a plurality of 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, an elastic retaining ring groove for the shaft tail hole, and two retaining ring grooves arranged at the upper and middle parts of the inner side wall of the shell 3; the plurality of threaded holes are fixedly connected to the cover plate 1.

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

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

[0012] The end surface of one side where the transmission part of the outer transmission shaft 14 is connected to the drive shaft is circumferentially provided with a plurality of oil holes for introducing the high-pressure oil in the annular cavity into the P2 oil cavity of the outer transmission shaft 14 .

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

[0014] The shaft tail sealing structure 16, the sealing ring C17 and the retaining ring C18 are installed correspondingly through a shaft tail sealing hole, a shaft tail sealing ring groove and a shaft tail hole elastic retaining ring groove.

[0015] Optionally, the above-mentioned segmented movable transmission device further comprises: a labyrinth sealing structure 6, a retaining ring A5, a retaining ring B8, and a sealing ring A7;

[0016] The labyrinth seal structure 6 is configured as an annular sleeve structure, and the retaining ring A5 and the retaining ring B8 are respectively installed correspondingly through the two retaining ring grooves provided at the upper part and the middle part of the inner side wall of the housing 3; and the labyrinth seal structure 6 is installed between the retaining ring A5 and the retaining ring B8, and the sealing ring A7 is installed between the labyrinth seal structure 6 and the inner side wall of the housing 3;

[0017] The labyrinth seal structure 6 cooperates with the housing 3 and the external transmission shaft 14 to isolate the P1 oil chamber at the spring 12 from the housing and the P2 oil chamber, thereby ensuring that the oil in the P2 oil chamber controls the movable transmission shaft 13 .

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

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

[0020] The lower end surface bearing 15 includes an axial bearing and a radial bearing, and is used for axially supporting and radially supporting the external transmission shaft 14 .

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

[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 P1 oil chamber;

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

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

[0025] The process of the spring force and the oil pressure in the P1 oil chamber forming a balance is as follows:

[0026] After the high-pressure oil flows to the inner cavity of the shell 3 through the pipe joint 10, it enters the P2 oil cavity of the outer transmission shaft 14 through the oil hole at the bottom of the outer transmission shaft 14, pushing the movable transmission shaft 13 to move upward; when the movable transmission shaft 13 needs to move downward, the pressure in the P2 oil cavity is reduced, and the movable transmission shaft 13 moves downward under the action of the spring force and the oil pressure in the P1 oil cavity, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil cavity is balanced with the pressure in the P2 oil cavity; when the movable transmission shaft 13 needs to move upward, the pressure in the P2 oil cavity is increased, and the movable transmission shaft 13 moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil cavity is balanced with the oil pressure in the P2 oil cavity.

[0027] In a second aspect, an embodiment of the present invention further provides a control method for a segmented movable transmission device, wherein the segmented movable transmission device as described in any one of the above items is used to perform the control method, comprising:

[0028] Step 1, confirming the expected moving distance L of the movable transmission shaft 13 according to the segment control requirements;

[0029] Step 2, calculating the high pressure oil pressure P2 in the control oil chamber P2 according to 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 into the control oil chamber P2 through the straight pipe joint 10.

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

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

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

[0034] When the movable transmission shaft 13 is required to move upward 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] Among them, P1 is the return oil pressure of the gear pump, which is a constant value, S1 is the vertical action area of ​​the P1 oil pressure, S2 is the vertical action area of ​​the P2 chamber oil pressure, and the spring force Ft = K × L.

[0037] Beneficial effects of the invention: An embodiment of the invention provides a segmented movable transmission device and a control method thereof. The segmented movable transmission device is suitable for gear pumps with different oil supply demands under different working conditions. The device has a simple structure, strong sealing, and is easy to implement. By using the 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 the segmented movable transmission device, the traditional transmission shaft is divided into two parts: an outer transmission shaft and a movable transmission shaft; its working principle is as follows: after the high-pressure oil flows to the inner cavity of the shell 3 through the pipe joint 10, it enters the P2 oil chamber of the outer transmission shaft 14 through the oil hole at the bottom of the outer transmission shaft 14, pushing the movable transmission shaft 13 to move upward; when the movable transmission shaft 13 needs to move downward, the pressure in the P2 oil chamber is reduced, and the movable transmission shaft 13 moves downward under the action of the spring force and the oil pressure in the P1 oil chamber, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil chamber is balanced with the pressure in the P2 oil chamber; when the movable transmission shaft 13 needs to move upward, the pressure in the P2 oil chamber is increased, and the movable transmission shaft 13 moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil chamber is balanced with the pressure in the P2 oil chamber.

[0038] In addition, the upper end bearing 11 and the cover plate 1 connected to the outer transmission shaft 14 jointly limit the upward movement of the outer transmission shaft 14; the labyrinth seal 6 and the shaft tail seal prevent the high-pressure oil entering the housing 3 from leaking, ensuring the sealing of the overall structure, and also serving as a radial bearing to provide support for the outer transmission shaft 14. The plane of the cover plate 1 in contact with the upper end bearing 11 forms an end face friction pair to ensure that the rotation of the outer transmission shaft is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

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

[0041] Figure 2 for Figure 1 The outer appearance of the segmented movable transmission device provided by the embodiment of the present invention is shown;

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

[0043] Figure 4 for Figure 1 A top view of an upper end surface bearing in a segmented movable transmission device provided by an embodiment of the present invention is shown;

[0044] Figure 5 for Figure 1 A bottom view of an outer transmission shaft in a segmented movable transmission device provided by an embodiment of the present invention is shown.

[0045] Description of reference numerals:

[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 joint; 11-upper end bearing; 12-spring; 13-movable transmission shaft; 14-external transmission shaft; 15-lower end bearing; 16-shaft tail sealing structure; 17-sealing ring C; 18-retaining ring C. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0048] As explained in the above background technology, during the operation of the gear pump, due to the different working states of the engine, the engine has different requirements for the oil supply in the gear pump, and it is necessary to adjust the oil supply of the gear pump. Therefore, the design concept of multi-stage gear graded oil supply is proposed. However, there is a dynamic sealing structure between the existing spline shaft and the parts. If the spline shaft is directly moved up and down, the sealing of the entire device will be destroyed, that is, the existing fixed spline shaft is difficult to meet the problem of graded oil supply.

[0049] In view of the above problems and the demand for graded oil supply of a gear pump, the embodiment of the present invention improves the traditional fixed transmission shaft and proposes a segmented movable transmission device and a control method thereof.

[0050] The segmented movable transmission shaft device provided by the present invention can autonomously adjust the working range of the spline shaft according to different high-pressure oil, and realize the movable working requirements of the spline shaft under the premise of ensuring the sealing of the device, thereby meeting the oil supply requirements of the gear pump under different conditions of the engine. The segmented movable transmission shaft device has a simple structure, strong sealing performance, and is easy to implement; it can not only meet the basic working requirements of the spline shaft, but also autonomously adjust the working range according to the oil supply requirements under different pressures, and realize the adjustment of the oil supply of the gear pump.

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

[0052] Figure 1 The overall structural diagram of a segmented movable transmission device provided by an embodiment of the present invention is as follows: Figure 2 for Figure 1 The external view of the segmented movable transmission device provided by the embodiment of the present invention is shown. Figure 1 and Figure 2 As shown, the main structure of the segmented movable transmission device provided by the embodiment of the present invention includes: a cover plate 1, a housing 3, an upper end surface 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 shell 3 is configured as a sleeve structure with an opening at one end, and a shaft tail sealing hole is provided at the other end face; the external transmission shaft 14 includes a transmission part and a drive shaft of an integrated structure, and the transmission part is a sleeve structure with an opening at one end. The external transmission shaft 14 passes through the shaft tail sealing hole of the shell 3 with its drive shaft, and its transmission part is placed in the sleeve of the shell 3, and the transmission part of the external transmission shaft 14 and the shell 1 form an annular cavity.

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

[0055] Figure 3 for Figure 1 The schematic diagram of the structure of the housing in the segmented movable transmission device provided by the embodiment of the present invention is shown in FIG. Figure 3 As shown, the opening end surface of the shell 3 is circumferentially provided with a plurality of 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, an elastic retaining ring groove for the shaft tail hole, and two retaining ring grooves arranged at the upper and middle parts of the inner side wall of the shell 3; the plurality of threaded holes are fixedly connected to the cover plate 1.

[0056] In one implementation of the embodiment of the present invention, based on the above-mentioned holes and slots provided on the housing 3, as shown in FIG. Figure 1 As shown, the segmented movable transmission device may also include: a straight pipe joint 10 and a sealing ring B9.

[0057] The shell 3 in the embodiment of the present invention is equipped with a straight pipe joint 10 through a straight pipe joint threaded hole and a straight pipe joint sealing ring groove, which is used to introduce high-pressure oil into the annular cavity between the shell 3 and the external transmission shaft 14 through the pipe joint 10, and a sealing ring B9 is installed between the straight pipe joint 10 and the straight pipe joint sealing ring groove.

[0058] The end surface of one side of the outer transmission shaft 14 where the transmission part is connected to the drive shaft is provided with a plurality of oil holes along the circumferential direction, which are used to introduce the high-pressure oil in the annular cavity into the P2 oil cavity of the outer transmission shaft 14. Figure 5 As shown, Figure 1 A bottom view of an outer transmission shaft in a segmented movable transmission device provided by an embodiment of the present invention is shown.

[0059] In one implementation of the embodiment of the present invention, 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, the sealing ring C17, and the retaining ring C18 are installed correspondingly through a shaft tail sealing hole, a shaft tail sealing ring groove, and a shaft tail hole elastic retaining ring groove on the housing; so as to achieve sealing between the driving part of the transmission shaft 14 and the housing 3.

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

[0062] In this implementation, the labyrinth sealing structure 6 is configured as an annular sleeve structure, and the two retaining ring grooves arranged at the upper and middle parts of the inner wall of the shell 3 are respectively installed with retaining rings A5 and B8; and the labyrinth sealing structure 6 is installed between the retaining rings A5 and B8, and a sealing ring A7 is installed between the labyrinth sealing structure 6 and the inner wall of the shell 3.

[0063] The labyrinth seal structure 6 cooperates with the housing 3 and the external transmission shaft 14 to isolate the P1 oil chamber at the spring 12 from the housing and the P2 oil chamber, thereby ensuring that the oil in the P2 oil chamber controls the movable transmission shaft 13 .

[0064] In one implementation of the embodiment of the present invention, Figure 1 As shown, the segmented movable transmission device also includes: a lower end surface 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 transmission shaft 14 , wherein the lower end face bearing 15 includes an axial bearing and a radial bearing for axially and radially supporting the outer transmission shaft 14 .

[0066] The working mode of the segmented movable transmission device provided in the above embodiment of the present invention is as follows:

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

[0068] In addition, through the P1 oil chamber and P2 oil chamber formed by the inner cavity of the transmission part in the outer transmission shaft 14 divided 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 forms a balance with the spring force and the oil pressure in the P1 oil chamber.

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

[0070] After the high-pressure oil flows to the inner cavity of the shell 3 through the pipe joint 10, it enters the P2 oil cavity of the outer transmission shaft 14 through the oil hole at the bottom of the outer transmission shaft 14, pushing the movable transmission shaft 13 to move upward; when the movable transmission shaft 13 needs to move downward, the pressure in the P2 oil cavity is reduced, and the movable transmission shaft 13 moves downward under the action of the spring force and the oil pressure in the P1 oil cavity, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil cavity is balanced with the pressure in the P2 oil cavity; when the movable transmission shaft 13 needs to move upward, the pressure in the P2 oil cavity is increased, and the movable transmission shaft 13 moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil cavity is balanced with the oil pressure in the P2 oil cavity.

[0071] Based on the segmented movable transmission device provided in the above embodiments of the present invention, the embodiments of the present invention further provide a control method for the segmented movable transmission device. The segmented movable transmission device provided in any of the above embodiments of the present invention is used to perform the control method, including:

[0072] Step 1, confirming the expected moving distance L of the movable transmission shaft 13 according to the segment control requirements;

[0073] Step 2, calculating the high pressure oil pressure P2 in the control oil chamber P2 according to 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 into the control oil chamber P2 through the straight pipe joint 10.

[0075] In one implementation of the embodiment of the present invention, the implementation process of the above step 2 includes:

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

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

[0078] When the movable transmission shaft 13 is required to move upward 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] Among them, P1 is the return oil pressure of the gear pump, which is a constant value, S1 is the vertical action area of ​​the P1 oil pressure, S2 is the vertical action area of ​​the P2 chamber oil pressure, and the spring force Ft = K × L.

[0081] The embodiment of the present invention provides a segmented movable transmission device and a control method thereof. The segmented movable transmission device is suitable for gear pumps with different oil supply demands under different working conditions. The device has a simple structure, strong sealing performance, and is easy to implement. By using the 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 the segmented movable transmission device, the traditional transmission shaft is divided into two parts: an outer transmission shaft and a movable transmission shaft; its working principle is as follows: after the high-pressure oil flows to the inner cavity of the shell 3 through the pipe joint 10, it enters the P2 oil chamber of the outer transmission shaft 14 through the oil hole at the bottom of the outer transmission shaft 14, pushing the movable transmission shaft 13 to move upward; when the movable transmission shaft 13 needs to move downward, the pressure in the P2 oil chamber is reduced, and the movable transmission shaft 13 moves downward under the action of the spring force and the oil pressure in the P1 oil chamber, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil chamber is balanced with the pressure in the P2 oil chamber; when the movable transmission shaft 13 needs to move upward, the pressure in the P2 oil chamber is increased, and the movable transmission shaft 13 moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil chamber is balanced with the pressure in the P2 oil chamber.

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

[0083] The implementation of the segmented movable transmission device and the control method thereof provided in the embodiments of the present invention will be schematically described below through some specific implementation examples.

[0084] Implementation Example

[0085] The engine has different requirements for the oil supply in the gear pump under different working conditions, and the transmission shaft needs to be able to move up and down under different working conditions to drive the multi-stage gears. In this regard, the present invention designs a segmented movable transmission device, which has a simple structure, strong sealing, and is easy to implement. It can not only meet the basic working requirements of the spline shaft, but also can independently adjust the working range according to the oil supply requirements under different pressures, thereby realizing the adjustment of the oil supply of the gear pump.

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

[0087] In this implementation example, the cover plate 1 cooperates with the upper end surface bearing 11 to balance the upward load. There are 8 countersunk holes evenly distributed on the cover plate 1 and it is connected to the housing 3 with 8 screws A.

[0088] The shell 3 is integrally configured as a cylindrical structure with an opening at one end, and a plurality of threaded holes are evenly arranged on the end surface of the open end along the circumferential direction, and is connected to the cover plate 1 by screws A2.

[0089] Specifically, the open end surface of the shell 3 is circumferentially provided with a plurality of threaded holes (for fixed connection with the cover plate 1 via screws A2), a straight pipe joint threaded hole, a straight pipe joint sealing ring groove (for installing and sealing the straight pipe joint 10); a shaft tail sealing hole, a shaft tail sealing ring groove, an elastic retaining ring groove for the shaft tail hole (for installing the sealing structure between the external transmission shaft 14 and the shell 3), and two retaining ring grooves provided on the upper and middle parts of the inner side wall of the shell 3 (retaining ring A5 and retaining ring B8 are respectively installed, so that the labyrinth sealing structure 6 is fixedly installed through the two retaining rings).

[0090] The eight threaded holes in the housing 3 are used to connect with the cover plate 1 using screws A;

[0091] A straight pipe joint threaded hole in the housing 3 is used to connect with the straight pipe joint 10;

[0092] A straight pipe joint sealing ring groove in the housing 3 is used in conjunction with the sealing ring B;

[0093] A shaft tail sealing ring groove in the housing 3, used in conjunction with the sealing ring C;

[0094] A shaft tail hole in the housing 3 is provided with an elastic retaining ring groove, which is used in conjunction with the retaining ring C;

[0095] The two retaining ring grooves in the inner wall of the shell 3 are used in conjunction with the retaining ring A and the retaining ring B respectively. The two retaining rings fix the labyrinth sealing structure 6 together up and down. 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 external transmission shaft 14 for sealing.

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

[0097] The screw B4 is used in conjunction with 10 threaded holes evenly distributed on the outer transmission shaft 14 to fix the upper end face bearing 11 and the outer transmission shaft 14, and is also used to install the spring 12 and the movable transmission shaft 13 to form a spring oil chamber P1.

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

[0099] The oil supply to the P1 chamber is: the oil in the gear pump that cooperates with the movable transmission shaft 13 enters the P1 chamber through the spline of 13 and the oil hole on 11, and there is an oil pressure difference on both sides of the end face of 13; by controlling the pressure of the high-pressure oil pressure in the P2 chamber, the axial movement of 13 is promoted.

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

[0101] The straight pipe joint 10 is a screw-in pipe joint, which is installed on the housing 3 through a threaded connection, and high-pressure oil is passed into the inner cavity of the housing 3 to form a P2 oil cavity.

[0102] The upper end surface bearing 11 is fastened to the outer transmission shaft 14 by means of screws B4 , and driven by the outer transmission shaft 14 , the upper end surface bearing 11 rotates synchronously at high speed.

[0103] The spring 12 generates a downward force on the movable transmission shaft 13, and the movable transmission shaft 13 is driven to move downward under the action of the spring force and the pressure of the P1 oil chamber.

[0104] In a specific implementation, 10 threaded holes, 18 oil holes, 3 movable grooves, and 1 section of external spline are provided on the outer transmission shaft 14; the 10 threaded holes in the outer transmission shaft 14 are connected to the upper end face bearing 11 through screws B4; the 18 oil holes in the outer transmission shaft 14 are used to pass the high-pressure oil in the inner cavity of the shell 3 into the oil cavity of the outer transmission shaft P2; the 3 movable grooves in the outer transmission shaft 14 are used in conjunction with the movable transmission shaft 13 to enable the movable transmission shaft 13 to move up and down therein.

[0105] The inner cavity of the outer transmission shaft 14 will form a P1 oil chamber and a P2 oil chamber under the division of the movable transmission shaft 13. The oil pressure in the P2 oil chamber will push the movable transmission shaft 13 to move upward until it forms a balance with the spring force and the oil pressure in the P1 oil chamber. The outer spline in the outer transmission shaft 14 is used to connect the inner spline of the casing to transmit torque.

[0106] The lower end bearing 15 is used to bear the downward load of the outer transmission shaft 14. The shaft tail seal 16 is used to seal the shaft tail to prevent the 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 extension length of the movable transmission shaft 13 and the pressure of the high-pressure oil source are calculated as follows:

[0109] like Figure 1 As shown, at this time, the installation height of the spring 12 is the free height, and the spring force Ft is 0. Assume that the moving distance of the movable transmission shaft 13 is L, then the spring compression length is also L, unit mm; P1 is the gear pump return oil pressure, which is a constant value, unit MPa, S1 is the vertical action area (annular area) of the P1 oil pressure, unit mm 2 ; S2 is the vertical action area of ​​the oil pressure in the P2 chamber, unit: mm 2 ; P2 is the pressure of the control oil chamber P2, unit MPa; K is the spring elastic coefficient, unit N / mm, according to Hooke's law, spring force Ft = K × L. If the movable transmission shaft 13 needs to move upward Lmm, 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 be calculated based on the expected moving distance L of the movable transmission shaft 13.

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

[0112] Sealing ring A7: prevents oil from coming from straight pipe joint 10 Figure 1 Leakage shown above.

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

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

[0115] The shaft tail sealing structure 16 is formed by the elastic material of its inner ring tightly hugging the shaft neck of the outer transmission shaft 14 to form a seal, thereby preventing the oil from the straight-through pipe joint 10 from leaking to the atmosphere.

[0116] Labyrinth seal structure 6: Its inner ring has dense micro grooves, which form a labyrinth + clearance fit with the outer transmission shaft 14 to prevent oil from the pipe joint 10 from flowing into the outer transmission shaft 14. Figure 1 There is leakage above as shown (there is a small leakage, but it does not affect the oil pressure of P1 and P2 oil chambers).

[0117] Specifically, the functions of retaining ring A5 and retaining ring B8 are:

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

[0119] The method for using the segmented movable transmission shaft device provided in this implementation example is as follows:

[0120] 1) After assembling the outer transmission shaft, movable transmission shaft, spring, and upper end bearing according to their respective positions, fasten the upper end bearing and the outer transmission shaft with screws;

[0121] 2) Install the assembled transmission shaft and lower end bearing into the housing, seal them with labyrinth seal and shaft tail seal, then fasten the cover plate and housing with screws, 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 the inlet and outlet of the gear pump to the corresponding inlet and outlet pipelines;

[0123] 4) During the operation of the gear pump, the outer transmission shaft rotates under the drive of the test bench to drive the movable transmission shaft, thereby driving the gear at the other end of the movable transmission shaft to rotate. When the transmission shaft needs to move downward, the pressure in the high-pressure oil pipeline is controlled to decrease, so that the pressure in the inner cavity of the outer transmission shaft decreases, and the movable transmission shaft is driven to move downward. During this process, the spring force gradually decreases until the spring force and the hydraulic pressure are balanced, so that the transmission shaft moves downward to the specified position; when the transmission shaft needs to move upward, the pressure in the high-pressure oil pipeline is controlled to increase, so that the pressure in the inner cavity of the outer transmission shaft increases, and the movable transmission shaft is driven to move upward. During this process, the spring force gradually increases until the spring force and the hydraulic pressure are balanced, so that the transmission shaft moves downward to the specified position.

[0124] The working principle of the segmented movable transmission shaft device provided by this implementation example is as follows: after the high-pressure incoming oil flows to the inner cavity of the shell 3 through the pipe joint 10, it enters the P2 oil cavity of the outer transmission shaft 14 through the oil hole at the bottom of the outer transmission shaft 14, pushing the movable transmission shaft 13 to move upward; when the movable transmission shaft 13 needs to move downward, the pressure in the P2 oil cavity is reduced, and the movable transmission shaft 13 moves downward under the action of the spring force and the oil pressure in the P1 oil cavity, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil cavity is balanced with the pressure in the P2 oil cavity; when the movable transmission shaft 13 needs to move upward, the pressure in the P2 oil cavity is increased, and the movable transmission shaft 13 moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil cavity is balanced with the pressure in the P2 oil cavity.

[0125] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A segmented movable transmission device, characterized in that: include: Cover plate (1), housing (3), upper end surface bearing (11), movable transmission shaft (13), outer transmission shaft (14); The housing (3) is configured as a sleeve structure with an opening at one end, and a shaft tail sealing hole is provided on the other end surface; the external transmission shaft (14) comprises a transmission part and a drive shaft of an integrated structure, the transmission part is a sleeve structure with an opening at one end, the external transmission shaft (14) passes through the shaft tail sealing hole of the housing (3) with its drive shaft, and its transmission part is placed in the sleeve of the housing (3), and the transmission part of the external transmission shaft (14) and the housing 1 form an annular cavity; The movable transmission shaft (13) comprises a shaft body portion and a disc-shaped shaft end portion of an integral structure; a spring (12) is sleeved on the shaft body portion of the movable transmission shaft (13); the movable transmission shaft (13) and the spring (12) are integrally nested and installed in the transmission portion of the outer transmission shaft (14); the upper end face bearing (11) is sleeved on the shaft body portion of the movable transmission shaft (13) through its central through hole and then fixedly connected to the open end face of the transmission portion of the outer transmission shaft (14) so ​​as to form a P1 oil chamber through the upper end face bearing (11), the outer transmission shaft (14) and the movable transmission shaft (13); and a P2 oil chamber is formed between the outer transmission shaft (14) and the disc-shaped shaft end portion of the movable transmission shaft (13); and the cover plate (1) is sleeved on the shaft body portion of the movable transmission shaft (13) through its through hole and then fixedly connected to the open end face of the housing (3).

2. A segmented movable transmission device according to claim 1, characterized in that: The open end surface of the shell (3) is provided with a plurality of 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, an elastic retaining ring groove for the shaft tail hole, and two retaining ring grooves provided at the upper and middle parts of the inner side wall of the shell (3); the plurality of threaded holes are fixedly connected to the cover plate (1).

3. A segmented movable transmission device according to claim 2, characterized in that: Also includes: Straight pipe joint (10) and sealing ring B (9); The housing (3) is provided with a straight pipe joint (10) through a straight pipe joint threaded hole and a straight pipe joint sealing ring groove, and is used to introduce high-pressure oil into the annular cavity between the housing (3) and the outer transmission shaft (14) through the pipe joint (10); a sealing ring B (9) is installed between the straight pipe joint (10) and the straight pipe joint sealing ring groove; A plurality of oil holes are arranged along the circumferential direction on the end surface of one side of the transmission part of the outer transmission shaft (14) connected to the drive shaft, and are used to introduce the high-pressure oil in the annular cavity into the P2 oil cavity of the outer transmission shaft (14).

4. A segmented movable transmission device according to claim 2, characterized in that: It also includes: a shaft tail sealing structure (16), a sealing ring C (17), and a retaining ring C (18); The shaft tail sealing structure (16), the sealing ring C (17) and the retaining ring C (18) are correspondingly installed through a shaft tail sealing hole, a shaft tail sealing ring groove and a shaft tail hole elastic retaining ring groove.

5. A segmented movable transmission device according to claim 2, characterized in that: Also includes: Labyrinth seal structure (6), retaining ring A (5), retaining ring B (8), sealing ring A (7); The labyrinth seal structure (6) is configured as an annular sleeve structure, and a retaining ring A (5) and a retaining ring B (8) are respectively installed through two retaining ring grooves provided at the upper part and the middle part of the inner side wall of the housing (3); and the labyrinth seal structure (6) is installed between the retaining ring A (5) and the retaining ring B (8), and a sealing ring A (7) is installed between the labyrinth seal structure (6) and the inner side wall of the housing (3); The labyrinth seal structure (6) cooperates with the housing (3) and the external transmission shaft (14) to isolate the P1 oil chamber at the spring (12) from the housing and the P2 oil chamber, thereby ensuring that the oil in the P2 oil chamber controls the movable transmission shaft (13).

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

7. A segmented movable transmission device according to any one of claims 1 to 6, 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 P1 oil chamber; The segmented movable transmission device is also used to form a P1 oil chamber and a P2 oil chamber through the inner cavity of the transmission part of the outer transmission shaft (14) divided by the movable transmission shaft (13), and the oil pressure in the P2 oil chamber pushes the movable transmission shaft (13) to move upward until a balance is formed with the spring force and the oil pressure in the P1 oil chamber.

8. A segmented movable transmission device according to claim 7, characterized in that: The process of the spring force and the oil pressure in the P1 oil chamber forming a balance 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 transmission shaft (14) through the oil hole at the bottom of the outer transmission shaft (14), pushing the movable transmission shaft (13) to move upward; when the movable transmission shaft (13) needs to move downward, the pressure in the P2 oil cavity is reduced, and the movable transmission shaft (13) moves downward under the action of the spring force and the oil pressure in the P1 oil cavity, during which the spring force gradually decreases until the spring force + the oil pressure in the P1 oil cavity is balanced with the pressure in the P2 oil cavity; when the movable transmission shaft (13) needs to move upward, the pressure in the P2 oil cavity is increased, and the movable transmission shaft (13) moves upward, during which the spring force gradually increases until the spring force + the oil pressure in the P1 oil cavity is balanced with the oil pressure in the P2 oil cavity.

9. A control method for a segmented movable transmission device, characterized in that: The control method is performed by using the segmented movable transmission device according to any one of claims 1 to 8, comprising: Step 1, according to the segmented control requirements, confirm the expected moving distance L of the movable transmission shaft (13); Step 2, calculating the high pressure oil pressure P2 in the control oil chamber P2 according to the expected moving distance L of the movable transmission shaft (13); Step 3, based on the calculated high pressure oil pressure P2 of the control oil chamber P2, adjust the oil pressure input into the control oil chamber P2 through the straight pipe joint (10).

10. The control method of the segmented movable transmission device according to claim 9, characterized in that: The step 2 comprises: The installation height of the spring (12) is set to be the free height, and the spring force Ft is set to be 0; When the moving distance of the movable transmission shaft (13) is set to L, the compression length of the spring is also L; When the movable transmission shaft (13) is required to move upward 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; Among them, P1 is the return oil pressure of the gear pump, which is a constant value, S1 is the vertical action area of ​​the P1 oil pressure, S2 is the vertical action area of ​​the P2 chamber oil pressure, and the spring force Ft = K × L.

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