Axial plunger type hydraulic supercharger with variable supercharging ratio

Abstract

An axial plunger type hydraulic supercharger with a variable supercharge ratio comprises a pump body and an end cover, a swash plate, a cylinder body and plungers are arranged in the pump body, one side, close to the cylinder body, of the end cover is connected with an oil distribution disc and a variable pressure disc, and hydraulic oil in plunger holes circulates through oil channels in the oil distribution disc, the variable pressure disc and the end cover; the oil distribution disc is provided with two kidney-shaped holes, the transformer disc is provided with an isolation boss, one kidney-shaped hole in the oil distribution disc is divided into two independent kidney-shaped holes by the isolation boss, and the isolation boss slides in the kidney-shaped holes along with the transformer disc under the action of a driving device and keeps sealing so as to change the through-flow area of the two independent kidney-shaped holes. According to the two kidney-shaped holes connected with the plunger holes in the oil distribution disc, the shape of one kidney-shaped hole is fixed, the interior of the other kidney-shaped hole is divided into the two through holes with the adjustable proportion, it can be guaranteed that the rotating speed change of the transformer cannot be too large when the flow of primary pressure changes, the working stability and reliability of the transformer are guaranteed, and the service life of the transformer is prolonged. And the supercharge ratio can be conveniently adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic transmission and control, in particular to an axial plunger type hydraulic supercharger with a variable boost ratio. Background Art

[0002] The main component used in the booster circuit of the hydraulic system is the booster cylinder, which is used to boost the low-pressure oil input into the hydraulic system through the booster cylinder to increase the pressure to meet the system's pressure requirements. It is mainly used in hydraulic circuits where the system oil supply pressure is relatively low and a branch requires a higher pressure but a small flow rate; or in energy recovery, the hydraulic system recovers hydraulic oil with a relatively low pressure. This hydraulic oil cannot be directly used to drive the actuators in the hydraulic system. The booster circuit must be used to increase the pressure to the required pressure before it can be used. The working principle of the booster cylinder is: when the supplied primary pressure oil (low-pressure oil) enters the large piston chamber of the booster cylinder, the pressure oil generates a thrust on the large piston, and the thrust is equal to the product of the input pressure and the effective area of ​​the large piston. This thrust pushes the small piston to move through the connecting rod, and pushes the oil output of the small piston chamber through the small piston, that is, the secondary pressure oil (high-pressure oil) output. The oil in this cavity also produces a reaction thrust on the small piston. Without considering the friction, the thrusts of the oil on the large piston and the small piston are equal, that is, the product of the oil pressure in the large piston cavity and its effective area is equal to the product of the oil pressure in the small piston cavity and its effective area. It can be seen that the ratio of the pressures in the large and small piston cavities, that is, the ratio of the primary pressure to the secondary pressure, is inversely proportional to the area of ​​the large and small pistons. The larger the area ratio of the large and small pistons, the greater the ratio of the secondary pressure to the primary pressure. This is the principle of supercharging.

[0003] According to the different structures of the booster cylinders used in the booster circuit, there are booster circuits for single-acting booster cylinders and booster circuits for double-acting booster cylinders. The booster circuit of a single-acting booster cylinder means that when the piston moves to one side, high-pressure oil is output, and when it returns, no high-pressure oil is output. The booster circuit of a double-acting booster cylinder means that when the piston reciprocates, high-pressure oil is output alternately at both ends, which can achieve continuous boosting. However, the boost ratios of these two booster circuits are fixed, so their applications are relatively simple.

[0004] In the boosting circuit of the above-mentioned boosting cylinder, if the primary pressure increases, the secondary pressure after boosting will also increase year on year, but the secondary pressure required by the system is relatively low compared to the secondary pressure after boosting, and it needs to be throttled or decompressed before it can be used, which will cause energy loss, causing the system to heat up and reduce efficiency; or the required secondary pressure increases, but the primary pressure does not change, and the secondary pressure oil after boosting cannot meet the system's requirements for the secondary pressure. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the technical deficiency of the above-mentioned boosting cylinder boosting circuit in which the boosting ratio is not variable, and to provide an axial piston hydraulic booster with a variable boosting ratio.

[0006] The present invention is realized by the following technical scheme: an axial piston type hydraulic supercharger with variable pressure ratio, comprising a pump body, a swash plate is provided at the bottom of the pump body, a cylindrical cylinder body is provided inside the pump body, a plurality of plunger holes are provided in the cylinder body along the axial direction, a plunger with one end in contact with the swash plate is provided in the plunger hole, an end cover is connected to the top of the pump body, an oil distribution plate is connected to the side of the end cover close to the cylinder body, a transformer plate is further provided between the oil distribution plate and the end cover, the hydraulic oil in the plunger hole is circulated through the oil distribution plate, the transformer plate and the oil passage on the end cover; an isolation boss is provided on the transformer plate, the isolation boss is connected to the waist-shaped hole on the oil distribution plate and isolates one waist-shaped hole on the oil distribution plate into two independent waist-shaped holes, the transformer plate connects each independent oil passage on the oil distribution plate with the oil passage on the end cover respectively, the transformer plate is connected to a driving device arranged on the outer side of the end cover through a driving shaft, and the isolation boss is displaced under the action of the driving device and changes the flow area of ​​two independent oil passages on one oil passage on the oil distribution plate.

[0007] It is further provided that: a plurality of plunger holes are symmetrically arranged in the cylinder body, and two waist-shaped holes connected with the plunger holes are symmetrically arranged on the oil distribution plate, one waist-shaped hole of the oil distribution plate is the first waist-shaped hole, and the other waist-shaped hole is divided into the second waist-shaped hole and the third waist-shaped hole by an isolation boss.

[0008] The transformer plate is provided with three oil passages, the first oil passage is a first through hole, a first transition groove and a first waist-shaped groove connected together, the second oil passage is a second through hole, a second transition groove and a second waist-shaped groove connected together, the third oil passage is a third through hole, a third transition groove and a third waist-shaped groove connected together, the first through hole, the second through hole and the third through hole are connected to the first waist-shaped hole, the second waist-shaped hole and the third waist-shaped hole respectively.

[0009] The isolation boss is arranged between the second through hole and the third through hole, the isolation boss is arc-shaped, and the isolation boss is embedded in the waist-shaped hole of the oil distribution plate and moves along the waist-shaped hole.

[0010] The end cover is provided with a first axial hole, a primary pressure oil inlet hole, a second axial hole, a secondary pressure oil discharge hole, a third axial hole and an oil return hole. The first axial hole, the second axial hole and the third axial hole are respectively connected to the first waist-shaped groove, the second waist-shaped groove and the third waist-shaped groove.

[0011] The transformer disc is provided with a limiting boss I, and the end cover is provided with a limiting boss II used in conjunction with the limiting boss, and the limiting boss II is arc-shaped.

[0012] The cylinder body, the oil distribution plate, the transformer plate and the end cover are sealed and connected.

[0013] The pump body and the end cover are fastened together by bolts, and the oil distribution plate is fixed on the end cover by positioning pins.

[0014] The driving device comprises a worm wheel, a worm and a motor.

[0015] The present invention has the following advantages: the present invention is an axial piston type hydraulic supercharger with a variable boost ratio, and the oil distribution plate has two waist-shaped holes connected to the plunger hole, wherein the shape of one of the waist-shaped holes is fixed, so the flow rate of hydraulic oil passing through the waist-shaped hole is fixed, which can ensure that the speed change of the supercharger does not become too large when the flow rate of the primary pressure changes, thereby ensuring the stability and reliability of the operation of the supercharger; the other waist-shaped hole is divided into two holes that are not connected to each other by an isolating boss on a transformer plate, and the sizes of the two holes are adjusted by rotating the transformer plate to change the position of the isolating boss in the waist-shaped hole, thereby realizing the change of the boost ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] In the attached picture: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a front view of the transformer disk of the present invention; Figure 3 It is a right side view of the transformer disk of the present invention; Figure 4 It is a schematic diagram of the structure of the oil distribution plate and the transformer plate of the present invention; Figure 5 is a front view of the end cap of the present invention; Figure 6 It is a right side view of the end cover of the present invention.

[0018] In the figure: 1, pump body, 2, inclined plate, 3, plug, 4, cylinder body, 5, oil distribution plate, 6, positioning pin, 7, transformer plate, 8, drive shaft, 9, end cover, 10, worm gear, 11, worm, 5-a, first waist-shaped hole, 5-b, second waist-shaped hole, 5-c, The third waist-shaped hole, 7-1, isolation boss, 7-2, limiting boss I, 7-a1, first through hole, 7-a2, first transition groove, 7-a3, first waist-shaped groove, 7-b1, second through hole, 7-b2, second transition groove, 7-b3, second waist-shaped groove, 7-c1, third through hole, 7-c2, third transition groove, 7-c3, third waist-shaped groove, 9-1, limiting boss II, 9-a1, first axial hole, 9-a2, primary pressure oil inlet hole, 9-b1, second axial hole, 9-b2, secondary pressure oil outlet hole, 9-c1, third axial hole, 9-c2, oil return hole.

[0019] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figures 1 to 6The axial piston type hydraulic supercharger with variable pressure ratio shown in the figure comprises a pump body 1, a swash plate 2 is provided at the bottom of the pump body 1, a cylinder body 4 is provided at the upper part of the pump body 1, a plurality of plunger holes are provided in the cylinder body 4 along the axial direction, a plunger 3 with one end in contact with the swash plate 2 is provided in the plunger hole, an end cover 9 is connected to the top of the pump body 1, an oil distribution plate 5 is connected to the side of the end cover 9 close to the cylinder body 4, a transformer plate 7 is further provided between the oil distribution plate 5 and the end cover 9, and the hydraulic oil in the plunger hole is discharged through the oil distribution plate 5, the transformer plate 7 and the end cover 9. The oil passage on the oil distribution plate 5 is circulated; the transformer plate 7 is provided with an isolation boss 7-1, and the isolation boss 7-1 is connected to the oil passage on the oil distribution plate 5 and isolates one oil passage on the oil distribution plate 5 into two independent oil passages. The transformer plate 7 connects the independent oil passages on the oil distribution plate 5 with the oil passages on the end cover 9 respectively. The transformer plate 7 is connected to a driving device arranged on the outside of the end cover 9 through a driving shaft 8. Under the action of the driving device, the isolation boss 7-1 is displaced and changes the flow area of ​​two independent oil passages on one oil passage on the oil distribution plate 5. The invention discloses an axial piston type hydraulic supercharger with a variable pressure ratio, wherein the pump body is cylindrical, a swash plate is fixed at the bottom of the pump body, a cylindrical cylinder body is also arranged in the pump body, the cylinder body can rotate in the pump body, a plunger hole is arranged along the circumferential direction at the left end of the cylinder body, a plunger is arranged in the plunger hole, the plunger moves leftward under the action of the oil pressure at the right end so that the left end and the swash plate are kept in close contact, the right end face of the cylinder body and the left end face of the oil distribution plate are kept in close contact and sealed, a small waist-shaped hole is arranged at the bottom of the plunger hole at the right end of the cylinder body and is communicated with the waist-shaped hole of the oil distribution plate, wherein the oil distribution plate is fixed on the end cover, the end cover is connected to the cylinder body, a variable pressure plate is arranged between the oil distribution plate and the end cover, oil channels are arranged on the oil distribution plate, the pressure plate and the end cover, and the hydraulic pressure in the plunger hole is controlled by the piston. The oil passages through the oil distribution plate and transformer plate are the same as the oil passages on the end cover. An isolation boss is provided on the transformer plate, which is used in conjunction with the oil distribution plate to isolate an oil passage on the oil distribution plate into two independent oil passages. At the same time, one end of the transformer plate is connected to the independent oil passages of the oil distribution plate, and the other end is connected to the end cover. When the isolation boss of the transformer plate changes position, the flow ratio of the two independent oil passages separated on the oil distribution plate can be changed, thereby achieving pressure regulation. The adjustment of the transformer plate position is achieved through a drive device. The transformer plate and the drive shaft are fixed together, and a power device is installed on the right end of the drive shaft. The power device drives the transformer plate to rotate within a certain range through the drive shaft to change the boost ratio, which is convenient and quick.

[0024] like Figure 1 and Figure 4The axial piston hydraulic supercharger with variable boost ratio shown in the figure has several plunger holes symmetrically arranged in the cylinder body 4, generally 7, 9 or 11, and two waist-shaped holes symmetrically arranged on the oil distribution plate 5 in conjunction with the plunger holes, one waist-shaped hole of the oil distribution plate 5 is the first waist-shaped hole 5-a, and the other waist-shaped hole is divided into the second waist-shaped hole 5-b and the third waist-shaped hole 5-c by the isolation boss 7-1. The isolation boss 7-1 is arranged between the second through hole 7-b1 and the third through hole 7-c1, and the isolation boss 7-1 is arc-shaped, and the isolation boss 7-1 is embedded in the waist-shaped hole of the oil distribution plate and moves along the waist-shaped hole. The oil distribution plate of the present invention has two waist-shaped holes, the right side is the first waist-shaped hole, and the isolation boss on the transformer plate is in the waist-shaped hole on the left side of the oil distribution plate. When the transformer plate rotates, the isolation boss on the transformer plate slides in the waist-shaped hole on the left side of the oil distribution plate, and the isolation boss divides the left waist-shaped hole into two second waist-shaped holes and a third waist-shaped hole that are not connected to each other.

[0025] like Figures 1 to 4 An axial piston hydraulic supercharger with a variable boost ratio is shown in the figure, and three oil passages are provided on the transformer plate 7, the first oil passage is a first through hole 7-a1, a first transition groove 7-a2 and a first waist-shaped groove 7-a3 connected together, the second oil passage is a second through hole 7-b1, a second transition groove 7-b2 and a second waist-shaped groove 7-b3 connected together, the third oil passage is a third through hole 7-c1, a third transition groove 7-c2 and a third waist-shaped groove 7-c3 connected together, the first through hole 7-a1, the second through hole 7-b1 and the third through hole 7-c1 are connected to the first waist-shaped hole 5-a, the second waist-shaped hole 5-b and the third waist-shaped hole 5-c respectively. The first through hole 7-a1 of the present invention is connected to the first waist-shaped groove 7-a3 through the first transition groove 7-a2; the second through hole 7-b1 is connected to the second waist-shaped groove 7-b3 through the second transition groove 7-b2; the third through hole 7-c1 is connected to the third waist-shaped groove 7-c3 through the third transition groove 7-c2, the first through hole 7-a1 on the transformer plate is connected to the first waist-shaped hole 5-a on the oil distribution plate 5, the second through hole 7-b1 on the transformer plate 7 is connected to the second waist-shaped hole 5-b on the oil distribution plate 5, and the third through hole 7-c1 on the transformer plate 7 is connected to the third waist-shaped hole 5-c on the oil distribution plate 5.

[0026] like Figures 1 to 6The axial piston hydraulic supercharger with variable boost ratio shown in the figure has a first axial hole 9-a1, a primary pressure oil inlet hole 9-a2, a second axial hole 9-b1, a secondary pressure oil drain hole 9-b2, a third axial hole 9-c1 and an oil return hole 9-c2 on the end cover 9, wherein the first axial hole 9-a1, the second axial hole 9-b1 and the third axial hole 9-c1 are connected to the first waist-shaped groove 7-a3, the second waist-shaped groove 7-b3 and the third waist-shaped groove 7-c3 respectively. The first axial hole 9-a1 of the present invention is connected to the primary pressure oil inlet hole 9-a2, the second axial hole 9-b1 is connected to the secondary pressure oil drain hole 9-b2, and the third axial hole 9-c1 is connected to the oil return hole 9-c2.

[0027] like Figure 2 , Figure 3 , Figure 5 and Figure 6 The axial piston type hydraulic supercharger with variable boost ratio shown in the figure has a limiting boss I 7-2 on the transformer disc 7, and a limiting boss II 9-1 used in conjunction with the limiting boss 7-2 on the end cover 9, and the limiting boss II 9-1 is arc-shaped. The limiting boss I of the present invention is used in conjunction with the limiting boss II to limit the position and rotation angle of the transformer disc.

[0028] like Figure 1 The axial piston hydraulic supercharger with a variable boost ratio is shown. On the one hand, the piston moves in a circular motion along the cylinder body. Since the piston and the inclined plate are in close contact, the piston also moves in an axial direction along the cylinder.

[0029] like Figures 1 to 6 The axial piston type hydraulic supercharger with variable boost ratio shown in the figure has a sealed connection between the cylinder body 4, the oil distribution plate 5, the transformer plate 7 and the end cover 9. The right end face of the cylinder body and the left end face of the oil distribution plate of the present invention are tightly attached and kept sealed, and the transformer plate and the right end face of the oil distribution plate and the bottom of the end cover are kept sealed.

[0030] like Figures 1 to 6 In the axial piston hydraulic supercharger with variable boost ratio shown in the figure, the pump body 1 and the end cover 9 are fastened together by bolts, and the oil distribution plate 5 is fixed on the end cover 9 by the locating pins 6. The pump body and the end cover of the present invention are fastened together by bolts; the oil distribution plate is provided with two locating holes, and the oil distribution plate and the end cover are fixed together by the locating pins during installation.

[0031] like Figure 1 The axial piston hydraulic booster with variable boost ratio shown in the figure comprises a worm gear 10, a worm 11 and a motor. The motor of the present invention can be a servo motor or a stepper motor.

[0032] The present invention discloses an axial piston hydraulic supercharger with a variable boost ratio, wherein three oil passages are formed by an oil distribution plate, a transformer plate and an end cover. First, a primary pressure oil inlet hole 9-a2, a first axial hole 9-a1, a first waist-shaped groove 7-a3, a first transition groove 7-a2, a first through hole 7-a1 on a transformer plate 7, and a first waist-shaped hole 5-a on an oil distribution plate 5 are connected, that is, 9-a2→9-a1→7-a3→7-a2→7-a1→5-a, forming a primary pressure oil inlet passage; second, a secondary pressure oil discharge hole 9-b2, a second axial hole 9-b1 on an end cover 9, a first waist-shaped groove 7-a3, a first transition groove 7-a2, a first through hole 7-a1 on a transformer plate 7, and a first waist-shaped hole 5-a on an oil distribution plate 5 are connected, that is, 9-a2→9-a1→7-a3→7-a2→7-a1→5-a, forming a primary pressure oil inlet passage; The second waist-shaped groove 7-b3, the second transition groove 7-b2, the second through hole 7-b1, and the second waist-shaped hole 5-b on the oil distribution plate 5 are connected, that is, 5-b→7-b1→7-b2→7-b3→9-b1→9-b2 form a secondary pressure oil discharge channel; the return oil hole 9-c2 and the third axial hole 9-c1 on the end cover 9, the third waist-shaped groove 7-c3, the third transition groove 7-c2, the third through hole 7-c1 on the transformer plate 7, and the third waist-shaped hole 5-c on the oil distribution plate 5 are connected, that is, 5-c→7-c1→7-c2→7-c3→9-c1→9-c2 form an oil return channel.

[0033] During operation, the primary pressure oil passes through the primary pressure oil inlet hole 9-a2 on the end cover and the primary pressure oil inlet channel into the first waist-shaped hole 5-a on the oil distribution plate 5. The primary pressure oil enters the plunger hole connected to the first waist-shaped hole, pushing the plunger to the left. The ball head on the left end of the plunger interacts with the swash plate 2 to generate a torque for the cylinder body 4 to rotate, pushing the cylinder body 4 to rotate, that is, the plunger connected to the first waist-shaped hole is in the working condition of the motor. The plunger connected to the second waist-shaped hole 5-b and the third waist-shaped hole 5-c retracts under the action of the swash plate 2, and the oil is discharged through the secondary pressure oil discharge channel and the return oil channel, that is, the plunger connected to the second waist-shaped hole 5-b and the third waist-shaped hole 5-c is in the working condition of the hydraulic pump. If the displacement of the first waist-shaped hole 5-a is V 1, the displacement of the second waist-shaped hole 5-b is V 2. The displacement of the third waist-shaped hole 5-c is V 3. That is, V 1= V 2+ V 3. Assume that the oil inlet pressure of the first waist-shaped hole 5-a is P 1. The oil discharge pressure of the second waist-shaped hole 5-b is P 2. Since the third waist-shaped hole 5-c is connected to the oil tank for oil return, its pressure is zero. Since the driving torque on the motor side is balanced with the resistance torque on the hydraulic pump side, the plunger on the hydraulic pump side connected to the second waist-shaped hole 5-b has a secondary oil return pressure. P 2, only then resistance torque is generated. Since the pressure of the plunger on the hydraulic pump side connected to the third waist-shaped hole 5-c is zero, theoretically no resistance torque is generated. According to the balance principle, the relationship between the primary and secondary pressures is: ; By rotating the transformer plate 7, the isolation boss 7-1 on the transformer plate changes the position of the waist-shaped hole on the left side of the oil distribution plate 5, which also changes the displacement of the second waist-shaped hole 5-b and the third waist-shaped hole 5-c. V 2 and V The size of 3 can also be changed P 2 pressure, that is, changing the pressure ratio.

[0034] The invention discloses an axial piston type hydraulic supercharger with variable boost ratio, in which a waist-shaped hole is fixed, so that the rotation speed of the transformer does not change too much when the flow of the primary pressure changes, thereby ensuring the stability and reliability of the transformer operation; the waist-shaped hole on the left side of the oil distribution plate is divided into two parts by an isolation boss on the transformer plate, and the central angles corresponding to the two waist-shaped holes are adjusted by changing their positions to adjust the boost ratio, and the adjustment is convenient; during operation, the pressures on both sides of the isolation boss are unequal, so that the oil distribution plate and the transformer plate generate tangential forces and generate additional torque, and the additional torque of the oil distribution plate is borne by the positioning pin, and the additional torque of the transformer plate is borne by the axial positioning of the worm through the driving shaft, the worm wheel and the worm; during production, it can be modified on the basis of the axial piston pump, and only the end cover, the transformer plate and its driving part need to be designed and processed, and the production is convenient.

[0035] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0036] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0037] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. An axial piston hydraulic supercharger with variable boost ratio, characterized in that: The invention comprises a pump body (1), wherein a swash plate (2) is provided at the bottom of the pump body (1), a cylinder body (4) is provided at the top of the pump body (1), a plurality of plunger holes are provided in the cylinder body (4) along the axial direction, a plunger (3) is provided in the plunger hole, one end of which is in contact with the swash plate (2), an end cover (9) is connected to the top of the pump body (1), an oil distribution plate (5) is connected to the side of the end cover (9) close to the cylinder body (4), a transformer plate (7) is further provided between the oil distribution plate (5) and the end cover (9), and hydraulic oil in the plunger hole is discharged through the oil passages on the oil distribution plate (5), the transformer plate (7) and the end cover (9). The transformer plate (7) is provided with an isolation boss (7-1), the isolation boss (7-1) is connected to the oil passage on the oil distribution plate (5) and isolates one oil passage on the oil distribution plate (5) into two independent oil passages, the transformer plate (7) connects the independent oil passages on the oil distribution plate (5) to the oil passages on the end cover (9), the transformer plate (7) is connected to a drive device arranged on the outside of the end cover (9) via a drive shaft (8), and the isolation boss (7-1) is displaced under the action of the drive device and changes the flow area of ​​the two independent oil passages on one oil passage on the oil distribution plate (5).

2. The axial piston type hydraulic supercharger with variable boost ratio according to claim 1, characterized in that: A plurality of plunger holes are symmetrically arranged in the cylinder body (4), and two waist-shaped holes connected with the plunger holes are symmetrically arranged on the oil distribution plate (5), one waist-shaped hole of the oil distribution plate (5) is a first waist-shaped hole (5-a), and the other waist-shaped hole is divided into a second waist-shaped hole (5-b) and a third waist-shaped hole (5-c) by an isolation boss (7-1).

3. The axial piston type hydraulic supercharger with variable pressure ratio according to claim 2, characterized in that: The transformer plate (7) is provided with three oil passages, wherein the first oil passage is a first through hole (7-a1), a first transition groove (7-a2) and a first waist-shaped groove (7-a3) connected together, the second oil passage is a second through hole (7-b1), a second transition groove (7-b2) and a second waist-shaped groove (7-b3) connected together, and the third oil passage is a third through hole (7-c1), a third transition groove (7-c2) and a third waist-shaped groove (7-c3) connected together, wherein the first through hole (7-a1), the second through hole (7-b1) and the third through hole (7-c1) are connected to the first waist-shaped hole (5-a), the second waist-shaped hole (5-b) and the third waist-shaped hole (5-c) respectively.

4. The axial piston type hydraulic supercharger with variable boost ratio according to claim 3, characterized in that: The isolation boss (7-1) is arranged between the second through hole (7-b1) and the third through hole (7-c1); the isolation boss (7-1) is arc-shaped; the isolation boss (7-1) is embedded in the waist-shaped hole of the oil distribution plate and moves along the waist-shaped hole.

5. The axial piston type hydraulic supercharger with variable pressure ratio according to claim 3, characterized in that: The end cover (9) is provided with a first axial hole (9-a1), a primary pressure oil inlet hole (9-a2), a second axial hole (9-b1), a secondary pressure oil discharge hole (9-b2), a third axial hole (9-c1) and an oil return hole (9-c2); the first axial hole (9-a1), the second axial hole (9-b1) and the third axial hole (9-c1) are respectively connected to the first waist-shaped groove (7-a3), the second waist-shaped groove (7-b3) and the third waist-shaped groove (7-c3).

6. The axial piston type hydraulic supercharger with variable boost ratio according to claim 1, characterized in that: The transformer disc (7) is provided with a limiting boss I (7-2), and the end cover (9) is provided with a limiting boss II (9-1) used in conjunction with the limiting boss (7-2), wherein the limiting boss II (9-1) is arc-shaped.

7. The axial piston type hydraulic supercharger with variable boost ratio according to claim 1, characterized in that: The cylinder body (4), the oil distribution plate (5), the transformer plate (7) and the end cover (9) are sealedly connected.

8. The axial piston type hydraulic supercharger with variable pressure ratio according to claim 1, characterized in that: The pump body (1) and the end cover (9) are fastened together by bolts, and the oil distribution plate (5) is fixed to the end cover (9) by a positioning pin (6).

9. The axial piston type hydraulic supercharger with variable pressure ratio according to claim 1, characterized in that: The driving device comprises a worm wheel (10), a worm (11) and a motor.

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