CN111237156A - Prevent plunger structure of hydraulic pressure jamming - Google Patents

Abstract

The invention provides a plunger structure for preventing hydraulic jamming, which is characterized in that it includes a plunger body, and the plunger body includes a cylindrical section arranged in the plunger hole and a sliding shoe outside the plunger hole to cooperate with each other The ball head, the cylindrical section and the ball head are smoothly connected to prevent the interference between the sliding shoe and the cylindrical section. The center lines of the cylindrical section and the ball head are located on the same straight line. For the through hole for conveying the liquid, the side of the cylindrical section is provided with an annular groove along the circumference for improving lubrication conditions and storing impurities. The plunger of the invention is simple in structure and easy to process, can balance lateral force, improve lubricating conditions and store dirt, and avoid foreign matter in the gap between the cylinder plunger hole and the plunger during the working process of the hydraulic pump. The plunger is stuck, which reduces the wear between the plunger hole and the plunger in the cylinder block, avoids the premature failure of the plunger pump, and improves the service life and utilization value of the plunger pump.

Description

A plunger structure to prevent hydraulic jamming

technical field

The invention relates to a plunger structure for preventing hydraulic jamming, and belongs to the technical field of hydraulic products of plunger pumps.

Background technique

The swash plate axial piston pump is an important part of the hydraulic system. The swash plate axial piston pump relies on the reciprocating motion of the plunger in the plunger cavity to change the internal volume of the plunger cavity to achieve oil suction and discharge. It is a positive displacement hydraulic pump. For the swash plate axial piston pump, the valve plate and the cylinder block, the cylinder block and the plunger are two important pairs of friction pairs, which directly affect the efficiency and life of the pump.

The cylinder and plunger are important friction pairs of the swash plate plunger pump. During assembly, the plunger and the cylinder hole form a precise clearance fit. During the working process of the plunger pump, the plunger rotates with the cylinder at a high speed. , while doing axial movement, the plunger produces a certain displacement, so as to realize the change of the flow rate of the plunger pump. The friction pair plays an important role in the swash plate plunger pump. However, the currently used plunger pump often occurs in the work, and there are many problems in the dismantling of the test piece. The most serious one is the hairpin between the cylinder block and the plunger. Wear, lead to abnormal noise in the plunger pump, increased internal leakage, and even more serious damage to the plunger pump, causing great pollution to the entire hydraulic system.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: during the operation of the hydraulic pump, the problem of sticking between the cylinder plunger hole and the plunger is easy to occur.

In order to solve the above problems, the technical solution of the present invention is to provide a plunger structure for preventing hydraulic stagnation, which is characterized in that it includes a plunger body, and the plunger body includes a cylindrical section arranged in the plunger hole and a plunger located in the plunger hole. The ball head that cooperates with the sliding shoe outside the plunger hole, the cylindrical section and the ball head are smoothly connected to prevent the interference between the sliding shoe and the cylindrical section. The centerline of the segment and the ball head is provided with a through hole for conveying liquid, and the side of the cylindrical segment is provided with an annular groove along the circumference for improving lubricating conditions and storing impurities.

Preferably, the cylindrical section and the ball head are connected by a concave arc surface.

Preferably, the through hole includes a hole 1 set in the cylindrical section and a hole 2 set in the ball head, the hole 1 is connected to the hole 2, and the hole diameters of the hole 1 and the hole 2 are different.

Preferably, the hole diameter of the first hole is larger than the hole diameter of the second hole.

Compared with the prior art, the beneficial effects of the present invention are:

The plunger of the invention is simple in structure and easy to process, can balance lateral force, improve lubricating conditions and store dirt, and avoid foreign matter in the gap between the plunger hole of the cylinder block and the plunger during the working process of the hydraulic pump. The plunger is stuck, which reduces the wear between the plunger hole and the plunger of the cylinder body, avoids the premature failure of the plunger pump, and improves the service life and utilization value of the plunger pump.

Description of drawings

1 is a cross-sectional view of the structure of the present invention used in a hydraulic pump;

Figure 2 is a sectional view of the structure of the present invention.

Detailed ways

In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2 , a plunger structure for preventing hydraulic jamming of the present invention is used in a hydraulic plunger pump, including a plunger body, and one end of the plunger body is a ball head 1 that is precisely matched with a sliding shoe 8 , The other end is the cylindrical section 3 which is precisely matched with the plunger hole 7. The ball head 1 and the cylindrical section 3 are smoothly connected by a concave arc surface 2 to prevent the sliding shoe 8 from interfering with the cylindrical section 3 when it rotates. The side surface of the cylindrical section 3 is machined with an annular groove 4 along the circumference, which can improve the lubrication conditions and store the dirt and impurities, and can avoid the hydraulic jamming of the plunger during the working process; the edges of the two ends of the annular groove 4 should be removed. No sharp edges are allowed to avoid the plunger from scratching the wall surface of the plunger hole 7 of the cylinder block during the working process. The centerlines of the cylindrical section 3 and the ball head 1 are located on the same straight line, and two holes 1 5 and 2 6 with different diameters are machined in the plunger body along the center line of the cylindrical section 3 and the ball head 1. The second hole 6 is connected to the hole one 5 and the hole two 6 arranged in the ball head 1, so that the high pressure oil is introduced into the sliding shoe 8 and the two sliding surfaces of the swash plate friction pair to form an oil film.

Because the plunger rotates at a high speed during the working process, and is precisely matched with the sliding shoe 8 and the plunger hole 7, in order to ensure its certain strength and wear resistance, the plunger is 38CrMoAl nitrided and then ground.

Claims (4)

1. A plunger structure for preventing hydraulic stagnation, characterized in that it comprises a plunger body, and the plunger body comprises a cylindrical section (3) arranged in a plunger hole (7) and a cylinder segment (3) located in the plunger hole (7) ) outside the ball head (1) that cooperates with the sliding shoe (8), the cylindrical section (3) and the ball head (1) are smoothly connected to prevent interference between the sliding shoe (8) and the cylindrical section (3), and the cylindrical section (3) ) and the center line of the ball head (1) are located on the same straight line, the plunger body is provided with a through hole for conveying liquid along the center line of the cylindrical section (3) and the ball head (1), and the side of the cylindrical section (3) An annular groove (4) is provided along the circumference for improving lubrication conditions and storing impurities. 2 . The plunger structure for preventing hydraulic jamming according to claim 1 , wherein the cylindrical section ( 3 ) and the ball head ( 1 ) are connected by a concave arc surface ( 2 ). 3 . 3. A plunger structure for preventing hydraulic jamming according to claim 1, characterized in that: the through hole comprises a hole one (5) arranged in the cylindrical section (3) and a hole (5) arranged in the ball head (1). ) in the hole two (6), the hole one (5) is connected to the hole two (6), the hole diameter of the hole one (5) and the hole two (6) are different. 4. A plunger structure for preventing hydraulic jamming according to claim 3, characterized in that: the hole diameter of the first hole (5) is larger than the hole diameter of the second hole (6).

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