CN202031765U - Blades of hydraulic motor - Google Patents

Abstract

The vane of a hydraulic motor is installed in the vane slot on the rotor, and a spring and a push rod are also installed in the vane slot. The push rod contacts the bottom surface of the vane so that it fits with the inner curved surface of the stator, and the vane is in a convex shape. , the top has a groove, and the blade head is installed in the groove. The blade head is made of nylon and polyamide. The blade head and the blade are closely matched. Its length is the same as that of the stator, and its top is higher than the top of the blade. The blade head and the stator The inner curved surfaces of the blades are in contact with each other, and the top surface of the blade head is a curved surface or a plane with chamfers. The blade head replaces the metal blade and contacts the inner curved surface of the stator, which reduces the friction coefficient, reduces heat generation, and reduces the internal loss of the hydraulic motor; due to the elasticity of nylon, under the thrust of the spring, the blade head can be slightly deformed, and the blade head and the inner The sealing of the curved surface contact is better, which effectively reduces internal leakage, improves the efficiency of the hydraulic motor, and reduces the vibration and noise when the motor is working.

Description

vane of a hydraulic motor

Technical field

The utility model relates to an important part of a vane type hydraulic motor, in particular to a vane of the hydraulic motor. the

Background technique

Traditional vane-type hydraulic motors, such as the structure disclosed in Patent No. CN 200420070363.4, "A Through-Hole Hydraulic Motor", the rotating shaft and the rotor are connected by splines, and the blade grooves are uniformly distributed along the axial direction on the rotor, and the blade grooves are along the radial direction. There is a semicircular hole or groove intersecting with it, which goes straight to the root of the blade groove. Springs and blades are installed in the blade groove. The high-pressure oil pushes the blade, and the blade drives the rotor to rotate, and the shaft drives other equipment. the

Both the vane and the stator are made of metal, and under the pushing force of the spring, the inner curved surfaces of the vane and the stator contact, and the mutual movement between the two produces friction. At the same time, limited by the inner curved surface, the blades also reciprocate along the normal direction of the rotor. As it rotates, the blades constantly impact the stator under the action of the spring. Long-term impact and friction will not only cause heat, but even cause damage to the inner curved surface of the stator and the top of the blade, resulting in a decrease in the sealing of the contact surface and internal leakage, thereby reducing the efficiency of the motor and reducing the output. torque. the

In order to solve the impact problem, the traditional measure is to increase the hardness of the inner curved surface of the blade and the stator by quenching or carburizing the contact surface, so as to prolong the life of the motor, but this not only increases the cost of the motor, but also increases the difficulty of processing, and cannot reduce The loss caused by the friction between the blades and the stator when the motor rotates. the

There are also blades made entirely of nylon on the market. Compared with metal blades, large-area nylon blades are repeatedly impacted in high-pressure oil immersion, and they are prone to aging and becoming brittle. The blades are prone to breakage due to long-term impact, and the service life is not long. the

Patent No. CN 200320103806.0 "Wrapping the blade of the working surface with a metal body" proposes a blade made of metal body wrapped with polytetrafluoroethylene filler, and the top surface and both sides are made of polytetrafluoroethylene. working surface. The vane has large volume, heavy weight, and large inertia when rotating, and is suitable for the situation of fixed connection with the rotor or the rotating shaft, but not suitable for the vane type hydraulic motor with reciprocating motion along the normal direction. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a blade of a hydraulic motor, which has good sealing between the blade and the stator, light weight, small inertia, flexible reciprocating motion, and small friction when rotating. the

The technical scheme adopted by the utility model to solve the technical problem is: a blade of a hydraulic motor is installed in the blade groove on the rotor, and there are two blind holes intersecting with it along the radial direction in the blade groove, and there are The spring is in contact with the push rod, and the bottom surface of the push rod and the blade is in contact with the inner curved surface of the stator. The top of the blade is provided with a groove, and the blade head is installed in the groove. The top of the blade head is higher than the top of the blade, and the blade The head is in contact with the inner curved surface of the stator. the

The blade head is closely fitted with the blade, and its length is the same as that of the stator. the

The top surface of the blade head is an arc surface or a plane with chamfers on both sides. the

The blade is close to a convex shape, and the height of both sides of the blade is smaller than the radius of the rotor. the

The beneficial effects of the utility model are:

1. The blade head made of nylon and polyamide is used instead of the metal blade to contact the inner curved surface of the stator, which reduces the friction coefficient between the two, reduces the heat caused by friction, and reduces the internal loss of the hydraulic motor;

2. Due to the elasticity of nylon, under the thrust of the spring, the blade head can be slightly deformed. The top surface of the blade head with chamfered or curved surface is in contact with the inner curved surface of the stator, which has better sealing performance and effectively reduces The internal leakage of the motor improves the efficiency of the hydraulic motor;

3. Limited by the inner curved surface, the blade will reciprocate along the normal direction when it rotates, and the blade head acts as a buffer to reduce the vibration and noise when the motor is working. the

Description of drawings

Figure 1 is a structural diagram of a hydraulic motor

Figure 2 is a sectional view of A-A in Figure 1

Figure 3 is a partial enlarged view of the blade part

Figure 4 is a perspective view of the blade and the blade head

Figure 5 is a perspective view of the rotor

Detailed ways

Below in conjunction with embodiment the utility model is further described. the

As shown in FIGS. 1 and 2 , a vane hydraulic motor includes a stator 1 , a rotor 4 , a rotating shaft 6 and a housing 7 . Housing 7 is made up of front and rear shell, and oil passage and bearing are arranged in the housing, and the inlet and outlet of oil passage are arranged on the housing surface. The two ends of the rotating shaft 6 are provided with splines for connecting with other equipment. The inner surface of the stator 1 is an inner curved surface 11 . the

As shown in FIG. 4 , the blade 2 is in a convex shape, and the height of both sides is much smaller than the radius of the rotor. The contact surface between the vane and the distribution plate on the shell is very small, so the friction force is small. This structure not only ensures the sealing, but also effectively reduces the weight of the vane. The top of blade 2 has groove 23, and blade head 3 is inserted in groove 23, and blade head 3 and blade 2 are closely matched, and glue can also be coated in groove 23, makes the connection of blade head and blade more firm. The top of the blade head 3 is higher than the top of the blade 2 and has the same length as the stator 1 . The blade 2 and the inner curved surface 11 of the stator are in contact via the blade head 3 . The material of the blade head is nylon and polyamide, which is made by cold working, and is cheaper than using polytetrafluoroethylene. better sealing. the

The blade 2 is in a convex shape, and the contact surface between the two ends and the distribution plate on the shell is very small, so the friction force on the side is small, and it is not necessary to install the blade head made of nylon. This structure not only ensures the sealing performance, but also effectively reduces the The weight of the blade is reduced, the inertia of the reciprocating motion of the blade is reduced, and the impact of the blade head 3 on the inner curved surface 11 of the stator is reduced. the

As shown in Figure 5, the rotor 4 is splined to the rotating shaft 6, and the surface of the rotor 4 is evenly distributed along the axial direction with 12 vane grooves 41, and the two ends of the vane grooves 41 have blind holes 42 along the radial direction, and the blind holes and the integrated The oil circuit is connected. As shown in FIGS. 3 and 4 , the push rod 21 is a cylinder with steps, the spring 5 is sleeved on the push rod 21 , and one end of the spring is supported by the stepped surface 22 of the push rod 21 . The spring 5 and the push rod 21 are packed into the blind hole 42, and then the blade 2 with the blade head 3 installed is packed into the blade groove 41, and the top surface of the push rod 21 withstands the bottom surface of the blade 2. Install the rotor 4 with the blades installed into the stator 1 . the

Install the rotating shaft 6 in the bearings of the front and rear shells 7, the stator 1 is located between the front and rear shells, seal with a seal and connect the three with 12 bolts 8 . the

The oil passage enters the blind hole along the axial hole 43, and the high-pressure oil acts on the root of the push rod to offset the pressure of the high-pressure oil on the blade. At the same time, the spring 5 applies thrust to the blade head 3 at the top of the blade through the push rod 21 and the blade 2. Make it closely contact with the inner curved surface 11 of the stator. The rotor 4, the blades 2, the blade heads 3 and the inner curved surface 11 of the stator form a sealed chamber, and high-pressure oil enters the sealed chamber to push the blades and the rotor to rotate, and then drive the rotating shaft to rotate. Because the inner curved surface is wavy, the volume of the sealing chamber changes continuously with the rotation, the motor completes the process of oil absorption and oil discharge, and the rotating shaft drives other equipment. the

Because the blade head is made of nylon and polyamide, the friction coefficient is small, and the sealing effect of the contact surface with the inner curved surface is good, and it also has a shock absorption effect. When the hydraulic motor rotates, the heat generated by friction and the amount of internal leakage are larger than those of ordinary metal. The hydraulic motor of the blade is small, because the main body of the blade is made of metal, the service life is much longer than that of the nylon blade, which not only improves the efficiency of the hydraulic motor, but also prolongs the service life of the hydraulic motor and reduces the noise when the motor is running. the

Claims (4)

1. The blade (2) of a hydraulic motor is installed in the blade groove (41) on the rotor (4). There are two blind holes (42) intersecting with it in the radial direction in the blade groove. There are The spring (5) and the push rod (21), the push rod and the bottom surface of the blade are in contact so as to cooperate with the inner curved surface of the stator (1), and it is characterized in that the top of the blade has a groove (23), and the groove (23) is formed in the groove. A blade head (3) is installed, the top of the blade head is higher than the top of the blade, and the blade head (3) is in contact with the inner curved surface of the stator (1). 2. The vane of a hydraulic motor according to claim 1, characterized in that the vane head (3) is closely fitted with the vane (2), and its length is the same as that of the stator (1). 3. The blade of a hydraulic motor according to claim 1, characterized in that the top surface (31) of the blade head is an arc-shaped surface or a plane with chamfers. 4. The vane of a hydraulic motor according to claim 1, characterized in that the vane (2) is close to a convex shape, and the height of both sides of the vane is smaller than the radius of the rotor. the

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