An axial piston hydraulic intensifier with variable boost ratio

Abstract

An axial piston-type hydraulic booster with variable boost ratio includes a pump body and an end cover. The pump body houses a swashplate, a cylinder, and a piston. A distribution plate and a transformer plate are connected to the side of the end cover near the cylinder. Hydraulic oil in the piston bore flows through oil passages on the distribution plate, transformer plate, and end cover. The distribution plate has two oblong holes, and the transformer plate has an isolation boss. The isolation boss divides one of the oblong holes on the distribution plate into two independent oblong holes. The isolation boss slides within the oblong holes under the action of a drive device and maintains a seal, thereby changing the flow area of ​​these two independent oblong holes. In this invention, the two oblong holes on the distribution plate connected to the piston bore have one fixed shape and the other internally isolated into two through holes with adjustable proportions. This ensures that the transformer speed does not change too much when the primary pressure and flow rate change, guaranteeing the stability and reliability of the transformer operation, and also allows for convenient adjustment of the boost ratio.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission and control technology, specifically to an axial piston hydraulic booster with a variable booster ratio. Background Technology

[0002] The main component used in the booster circuit of a hydraulic system is the booster cylinder. Its function is to increase the pressure of the low-pressure oil input to the hydraulic system to meet the system's pressure requirements. It is mainly used in hydraulic circuits where the system's supply pressure is relatively low, but a branch requires higher pressure but a smaller flow rate; or in energy recovery systems where the hydraulic system recovers low-pressure hydraulic oil that cannot be directly used to drive the actuators in the hydraulic system and must be boosted to the required pressure before use. The working principle of the booster cylinder is as follows: when the supplied primary pressure oil (low-pressure oil) enters the large piston chamber of the booster cylinder, the oil exerts a thrust on the large piston. The magnitude of this thrust is equal to the product of the input pressure and the effective area of ​​the large piston. This thrust drives the small piston through the connecting rod, which in turn drives the oil output from the small piston chamber, i.e., the secondary pressure oil (high-pressure oil). The oil in this chamber also generates a reaction force on the small piston. Neglecting friction, the oil thrust on the large and small pistons is equal in magnitude; that is, the product of the oil pressure in the large piston chamber and its area of ​​action is equal to the product of the oil pressure in the small piston chamber and its area of ​​action. Therefore, the pressure ratio between the large and small piston chambers, i.e., 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 larger the ratio of the secondary pressure to the primary pressure; this is the principle of pressure intensification.

[0003] Depending on the structure of the booster cylinder used in the booster circuit, there are booster circuits with single-acting and double-acting cylinders. A single-acting booster circuit outputs high-pressure oil when the piston moves to one side and no high-pressure oil outputs when it returns. A double-acting booster circuit, on the other hand, outputs high-pressure oil alternately at both ends during the piston's reciprocating motion, achieving continuous boosting. However, the boosting ratio of both types of booster circuits is fixed, thus limiting their applications.

[0004] In the booster circuit of the booster cylinder mentioned above, if the primary pressure increases, the secondary pressure after boosting will also increase proportionally. However, the secondary pressure required by the system is relatively low compared to the boosted secondary pressure, and it needs to be throttled or depressurized before it can be used. This will cause energy loss, heat up the system, and reduce efficiency. Alternatively, if the required secondary pressure increases but the primary pressure remains unchanged, the boosted secondary pressure oil will not be able to meet the system's requirements for secondary pressure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technology of the pressure ratio being variable in the pressure boosting circuit of the boosting cylinder, and to provide an axial piston hydraulic booster with variable pressure ratio.

[0006] This invention is achieved through the following technical solution: an axial piston-type hydraulic booster with variable boost ratio, comprising a pump body, a swashplate at the bottom of the pump body, a cylindrical cylinder inside the pump body, a plurality of piston holes along the axial direction inside the cylinder, a piston with one end in contact with the swashplate in each piston hole, an end cap connected to the top of the pump body, a distribution plate connected to the side of the end cap near the cylinder, a pressure transformer plate between the distribution plate and the end cap, hydraulic oil in the piston holes circulates through oil passages on the distribution plate, the pressure transformer plate, and the end cap; the pressure transformer plate has an isolation boss, the isolation boss connects to a waist-shaped hole on the distribution plate and isolates one waist-shaped hole on the distribution plate into two independent waist-shaped holes, the pressure transformer plate connects each independent oil passage on the distribution plate to an oil passage on the end cap, the pressure transformer plate is connected to a drive device located outside the end cap via a drive shaft, the isolation boss is displaced under the action of the drive device and changes the flow area of ​​the two independent oil passages on one oil passage of the distribution plate.

[0007] Furthermore, the cylinder body is symmetrically provided with a number of plunger holes, and the oil distribution plate is symmetrically provided with two waist-shaped holes connected to the plunger holes. One waist-shaped hole of the oil distribution plate is the first waist-shaped hole, and the other waist-shaped hole is divided into a second waist-shaped hole and a third waist-shaped hole through an isolation boss.

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

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

[0010] The end cap is provided with a first axial hole, a primary pressure oil inlet hole, a second axial hole, a secondary pressure oil outlet hole, a third axial hole, and a return oil 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 plate is provided with a limiting boss I, and the end cover is provided with a limiting boss II that works in conjunction with the limiting boss. The limiting boss II is arc-shaped.

[0012] The cylinder block, oil distribution plate, transformer plate and end cover are sealed together.

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

[0014] The drive device includes a worm gear, a worm, and a motor.

[0015] The present invention has the following advantages: The present invention provides an axial piston hydraulic booster with variable boost ratio. The oil distribution plate has two oblong holes connected to the piston holes. The shape of one oblong hole is fixed, so the hydraulic oil flow through the oblong hole is fixed, which can ensure that the speed change of the booster cannot be too large when the flow rate changes with the primary pressure, thus ensuring the stability and reliability of the booster operation. The other oblong hole is divided into two non-communicating holes by an isolation boss on the pressure transformer plate. The size of the two holes can be adjusted by changing the position of the isolation boss in the oblong hole by rotating the pressure transformer plate, thereby realizing the change of boost ratio. Attached Figure Description

[0016] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a front view of the transformer plate of the present invention;

[0020] Figure 3 This is a right view of the transformer plate of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the oil distribution plate and the transformer plate of the present invention;

[0022] Figure 5 This is a front view of the end cap of the present invention;

[0023] Figure 6 This is a right view of the end cap of the present invention.

[0024] In the diagram: 1. Pump body, 2. Swashplate, 3. Plug, 4. Cylinder block, 5. Distributor plate, 6. Locating pin, 7. Transformer plate, 8. Drive shaft, 9. End cover, 10. Worm gear, 11. Worm, 5-a. First oblong bore, 5-b. Second oblong bore, 5-c. Third oblong hole, 7-1, isolation boss, 7-2, limiting boss I, 7-a1, first through hole, 7-a2, first transition groove, 7-a3, first oblong groove, 7-b1, second through hole, 7-b2, second transition groove, 7-b3, second oblong groove, 7-c1, third through hole, 7-c2, third transition groove, 7-c3, third oblong 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, return oil hole.

[0025] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0026] To make the objectives, 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 with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figures 1 to 6The diagram illustrates an axial piston-type hydraulic booster with a variable boost ratio, comprising a pump body 1. A swashplate 2 is located at the bottom of the pump body 1, and a cylinder 4 is located at the top of the pump body 1. The cylinder 4 has several piston holes arranged axially within it, and a piston 3, one end of which contacts the swashplate 2, is located within each piston hole. An end cap 9 is connected to the top of the pump body 1, and a distribution plate 5 is connected to the side of the end cap 9 closest to the cylinder 4. A pressure transformer 7 is also provided between the distribution plate 5 and the end cap 9. Hydraulic oil in the piston holes passes through the distribution plate 5, the pressure transformer 7, and the end cap 9. The oil passages on the transformer plate 7 are used for circulation; the transformer plate 7 is provided with an isolation boss 7-1, which is connected to the oil passages on the distribution plate 5 and isolates one oil passage on the distribution plate 5 into two independent oil passages. The transformer plate 7 connects each independent oil passage on the distribution plate 5 to the oil passage on the end cover 9. The transformer plate 7 is connected to a drive device located on the outside of the end cover 9 through a drive shaft 8. 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 of the distribution plate 5. This invention discloses an axial piston-type hydraulic booster with a variable boost ratio. The pump body is cylindrical, with a swashplate fixed to its bottom. The pump body also contains a cylindrical cylinder that can rotate within the pump body. A piston hole is arranged circumferentially at the left end of the cylinder, containing a piston. Under the pressure of the hydraulic fluid at the right end, the piston moves to the left, keeping the left end in close contact with the swashplate. The right end face of the cylinder and the left end face of the distribution plate are in close contact and sealed. A small, oblong hole at the bottom of the piston hole at the right end of the cylinder communicates with an oblong hole in the distribution plate. The distribution plate is fixed to an end cap, which is connected to the cylinder. A variable-position pressure transformer is located between the distribution plate and the end cap. Oil passages are provided on the distribution plate, the pressure transformer, and the end cap, and the hydraulic fluid in the piston hole... The oil passes through the same oil passages on the distribution plate and transformer plate as those on the end cover. The transformer plate has an isolation boss that works in conjunction with the distribution plate to divide one oil passage on the distribution plate into two independent oil passages. Simultaneously, one end of the transformer plate connects to each independent oil passage on the distribution plate, and the other end connects to the end cover. When the position of the isolation boss on the transformer plate changes, the flow ratio of the two independent oil passages separated on the distribution plate can be altered, thereby achieving pressure regulation. The position adjustment of the transformer plate is achieved through a drive device. The transformer plate and drive shaft are fixed together, and a power unit is installed on the right end of the drive shaft. The power unit drives the transformer plate to rotate within a certain range via the drive shaft, changing the pressure ratio conveniently and quickly.

[0030] like Figure 1 and Figure 4The diagram illustrates an axial piston-type hydraulic booster with a variable boost ratio. The cylinder body 4 has several symmetrically arranged piston holes, typically 7, 9, or 11. The distribution plate 5 has two symmetrically arranged oblong holes connected to the piston holes. One oblong hole on the distribution plate 5 is a first oblong hole 5-a, and the other oblong hole is divided into a second oblong hole 5-b and a third oblong hole 5-c by an isolation boss 7-1. The isolation boss 7-1 is located between the second through hole 7-b1 and the third through hole 7-c1. The isolation boss 7-1 is arc-shaped and is embedded within the oblong hole of the distribution plate, moving along the oblong hole. The oil distribution plate of the present invention has two oblong holes, the right side being the first oblong hole. The isolation boss on the transformer plate is in the oblong 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 oblong hole on the left side of the oil distribution plate, dividing the oblong hole on the left side into two non-communicating second oblong holes and third oblong holes through the isolation boss.

[0031] like Figures 1 to 4 The diagram shows an axial piston-type hydraulic booster with a variable boost ratio. The pressure plate 7 has three oil passages. The first oil passage consists of 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 consists of 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 consists of 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 respectively connected to the first waist-shaped hole 5-a, the second waist-shaped hole 5-b, and the third waist-shaped hole 5-c. The first through hole 7-a1 of the present invention communicates with the first transition groove 7-a2 and the first waist-shaped groove 7-a3; the second through hole 7-b1 communicates with the second transition groove 7-b2 and the second waist-shaped groove 7-b3; the third through hole 7-c1 communicates with the third transition groove 7-c2 and the third waist-shaped groove 7-c3. The first through hole 7-a1 on the transformer plate communicates with the first waist-shaped hole 5-a on the oil distribution plate 5, the second through hole 7-b1 on the transformer plate 7 communicates with 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 communicates with the third waist-shaped hole 5-c on the oil distribution plate 5.

[0032] like Figures 1 to 6The diagram illustrates an axial piston-type hydraulic booster with a variable booster ratio. The end cap 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 outlet hole 9-b2, a third axial hole 9-c1, and a return oil 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 a first oblong groove 7-a3, a second oblong groove 7-b3, and a third oblong groove 7-c3. In this invention, the first axial hole 9-a1 communicates with the primary pressure oil inlet hole 9-a2, the second axial hole 9-b1 communicates with the secondary pressure oil outlet hole 9-b2, and the third axial hole 9-c1 communicates with the return oil hole 9-c2.

[0033] like Figure 2 , Figure 3 , Figure 5 and Figure 6 The diagram illustrates an axial piston-type hydraulic booster with a variable boost ratio. The transformer plate 7 has a limiting boss I 7-2, and the end cover 9 has a limiting boss II 9-1 that cooperates with the limiting boss 7-2. The limiting boss II 9-1 is arc-shaped. The limiting boss I, in conjunction with the limiting boss II, is used to limit the position and rotation angle of the transformer plate.

[0034] like Figure 1 The diagram shows an axial piston hydraulic booster with a variable boost ratio. The piston moves in a circular motion along the cylinder body, and because the piston and the swashplate are in close contact, the piston also moves axially along the cylinder.

[0035] like Figures 1 to 6 The diagram illustrates an axial piston-type hydraulic booster with a variable boost ratio, wherein the cylinder body 4, the distributor plate 5, the transformer plate 7, and the end cap 9 are sealed together. The right end face of the cylinder body and the left end face of the distributor plate are tightly fitted and sealed, while the right end faces of the transformer plate and the distributor plate, as well as the bottom of the end cap, remain sealed.

[0036] like Figures 1 to 6 The diagram shows an axial piston-type hydraulic booster with a variable boost ratio. The pump body 1 and end cover 9 are fastened together by bolts, and the distribution plate 5 is fixed to the end cover 9 by locating pins 6. In this invention, the pump body and end cover are fastened together by bolts; the distribution plate has two locating holes, and during installation, the distribution plate and end cover are fixed together by locating pins.

[0037] like Figure 1 The invention discloses an axial piston-type hydraulic booster with a variable boost ratio. The drive unit includes a worm gear 10, a worm 11, and a motor. The motor of the invention can be a servo motor or a stepper motor.

[0038] This invention discloses an axial piston-type hydraulic booster with a variable boost ratio. Three oil passages are formed by a distribution plate, a transformer plate, and an end cap. Firstly, the primary pressure oil inlet hole 9-a2, the first axial hole 9-a1, the first oblong groove 7-a3, the first transition groove 7-a2, and the first through hole 7-a1 on the transformer plate 7, and the first oblong hole 5-a on the distribution plate 5 are interconnected, i.e., 9-a2→9-a1→7-a3→7-a2→7-a1→5-a, forming a primary pressure oil inlet channel. Secondly, the secondary pressure oil outlet hole 9-b2 and the second axial hole 9-b1 on the end cap 9, and the transformer plate 7... The second waist-shaped groove 7-b3, the second transition groove 7-b2, and the second through hole 7-b1 on the oil distribution plate 5 are connected to the second waist-shaped hole 5-b on the oil distribution plate 5, 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 are connected to the third waist-shaped groove 7-c3, the third transition groove 7-c2, and the third through hole 7-c1 on the transformer plate 7, that is, 5-c→7-c1→7-c2→7-c3→9-c1→9-c2 form a return oil channel.

[0039] During operation, primary pressure oil enters through the primary pressure oil inlet hole 9-a2 on the end cap and into the first oblong hole 5-a on the distribution plate 5. Primary pressure oil enters the plunger hole connected to the first oblong hole, pushing the plunger to the left. The ball end of the plunger interacts with the swashplate 2, generating torque that rotates the cylinder 4, thus rotating the cylinder 4. In other words, the plunger connected to the first oblong hole operates as a motor. The plunger connected to the second oblong hole 5-b and the third oblong hole 5-c retracts under the action of the swashplate 2, draining oil through the secondary pressure oil discharge channel and return channel. In other words, the plunger connected to the second oblong hole 5-b and the third oblong hole 5-c operates as a hydraulic pump. If the displacement of the first oblong hole 5-a is... V 1. The displacement of the second oblong orifice 5-b is V 2. The displacement of the third oblong orifice 5-c is V 3, that is, there is V 1= V 2+ V 3. Let the oil inlet pressure of the first oblong orifice 5-a be... P 1. The oil discharge pressure of the second oblong orifice 5-b is... P 2. Because the third oblong orifice 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 resistive torque on the hydraulic pump side, and the plunger on the hydraulic pump side, connected to the second oblong orifice 5-b, has secondary oil return pressure. P 2. Only then will resistance torque be generated. The plunger connected to the hydraulic pump side and the third oblong orifice 5-c, theoretically, does not generate resistance torque because the pressure is zero. According to the balance principle, the relationship between the primary and secondary pressures is:

[0040] ;

[0041] By rotating the transformer plate 7, the position of the isolation boss 7-1 on the transformer plate relative to the left oblong hole of the oil distribution plate 5 is changed, thus altering the discharge capacity of the second oblong hole 5-b and the third oblong hole 5-c. V 2 and V The size of 3 can also be changed. P 2. Pressure, i.e., changing the transformer ratio.

[0042] This invention discloses an axial piston hydraulic booster with a variable boost ratio. A fixed oblong orifice ensures that the transformer's rotational speed does not change excessively with variations in primary pressure and flow rate, guaranteeing the transformer's stability and reliability. An isolation boss on the transformer plate divides the oblong orifice on the left side of the distribution plate into two parts, and the boost ratio is adjusted by changing the position of these two orifices to regulate the corresponding central angle, making adjustment convenient. During operation, the unequal pressure on both sides of the isolation boss generates tangential forces on the distribution plate and the transformer plate, producing additional torque. The additional torque on the distribution plate is borne by a locating pin, while the additional torque on the transformer plate is borne by the drive shaft, worm gear, and worm, with the worm providing axial positioning. In production, it can be modified from an axial piston pump, requiring only the design and machining of the end cover, transformer plate, and drive unit, making production convenient.

[0043] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0044] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An axial piston-type hydraulic booster with variable boost ratio, characterized in that: The system includes a pump body (1), a swash plate (2) at the bottom of the pump body (1), a cylinder (4) at the top of the pump body (1), a plurality of plunger holes along the axial direction in the cylinder (4), a plunger (3) with one end in contact with the swash plate (2) in the plunger hole, an end cap (9) connected to the top of the pump body (1), an oil distribution plate (5) connected to the side of the end cap (9) near the cylinder (4), a transformer plate (7) between the oil distribution plate (5) and the end cap (9), and hydraulic oil in the plunger holes enters through the oil passages on the oil distribution plate (5), the transformer plate (7) and the end cap (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 each independent oil passage on the oil distribution plate (5) to the oil passage on the end cover (9). The transformer plate (7) is connected to the drive device located outside the end cover (9) through the drive shaft (8). 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). The cylinder body (4) is symmetrically provided with several plunger holes, and the oil distribution plate (5) is symmetrically provided with two waist-shaped holes connected to 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) through the isolation boss (7-1). The transformer plate (7) is provided with three oil passages. The first oil passage consists of 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 consists of 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 consists of 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 respectively connected to the first waist-shaped hole (5-a), the second waist-shaped hole (5-b), and the third waist-shaped hole (5-c). The isolation boss (7-1) is located between the second through hole (7-b1) and the third through hole (7-c1). The isolation boss (7-1) is arc-shaped and is embedded in the waist-shaped hole of the oil distribution plate and moves along the waist-shaped hole.

2. The axial piston hydraulic booster with variable boost ratio as described in claim 1, characterized in that: The end cap (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 outlet hole (9-b2), a third axial hole (9-c1), and a return oil 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).

3. The axial piston hydraulic booster with variable boost ratio as described in claim 1, characterized in that: The transformer plate (7) is provided with a limiting boss I (7-2), and the end cover (9) is provided with a limiting boss II (9-1) that works in conjunction with the limiting boss I (7-2). The limiting boss II (9-1) is arc-shaped.

4. The axial piston hydraulic booster with variable boost ratio as described in claim 1, characterized in that: The cylinder block (4), oil distribution plate (5), transformer plate (7) and end cover (9) are sealed together.

5. The axial piston hydraulic booster with variable boost ratio as described in 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).

6. The axial piston hydraulic booster with variable boost ratio as described in claim 1, characterized in that: The drive device includes a worm gear (10), a worm (11), and a motor.

Images