CN213953799U

CN213953799U - Long service life's hydraulic motor

Info

Publication number: CN213953799U
Application number: CN202022976221.6U
Authority: CN
Inventors: 范建良; 沈全波; 周莉刚
Original assignee: Ningbo Oil Control Hycdraulic Co ltd
Current assignee: Ningbo Oil Control Hycdraulic Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-08-13
Anticipated expiration: 2030-12-08

Abstract

The utility model relates to a long service life's hydraulic motor, including casing, bent axle and a plurality of plunger-link assembly along radial distribution in the circumferencial direction of bent axle, the plunger among each plunger-link assembly slides in the corresponding jar hole of casing, and has the ball socket of being connected with respective connecting rod bulb looks ball pivot on each plunger, and the face of cylinder of each connecting rod bottom contacts its characterized in that with the epaxial eccentric wheel that corresponds of bent: the center line of each cylinder hole deflects towards the rotation direction of the crankshaft, so that a small included angle is formed between the center line of the cylinder hole and the radial line of the shell. After adopting above-mentioned structure for the contained angle of connecting rod between to the reaction force of plunger and the central line in jar hole diminishes, thereby makes hydraulic pressure power and reaction force's resultant force diminish, reduces the effort (also lateral force) of the inner wall in jar hole promptly, so the utility model discloses can reduce the frictional force of plunger and jar hole inner wall, avoid the too fast wearing and tearing of jar hole inner wall effectively, thereby reach extension pneumatic cylinder life's purpose.

Description

Long service life's hydraulic motor

Technical Field

The utility model relates to a hydraulic motor especially indicates a long service life's hydraulic motor.

Background

The existing crankshaft connecting rod type hydraulic motor generally comprises a shell, an oil distribution disc, plunger-connecting rod assemblies and a crankshaft, wherein odd cylinder holes are formed in the shell, the plunger-connecting rod assemblies also have odd numbers, the number of the plunger-connecting rod assemblies is matched with the number of the cylinder holes, plungers in the plunger-connecting rod assemblies are arranged in the cylinder holes in a sliding mode, ball sockets are arranged on the plungers, the plungers are matched with ball heads of corresponding connecting rods through the ball sockets to achieve ball hinge connection of the plungers and the connecting rods, a cylindrical surface at the bottom of each connecting rod is contacted with an eccentric wheel of the crankshaft, after assembly, the plunger-connecting rod assemblies are uniformly distributed on the circumference of the crankshaft in a radial mode, the crankshaft is supported in the shell and a sealing cover through bearings, one end of the crankshaft is connected with the oil distribution disc through a key, and the other end of the crankshaft is used for connecting loads. Such a hydraulic motor is disclosed in chinese patent law publication No. CN 2924113Y.

Because the shell of the existing hydraulic cylinder adopts the structure shown in fig. 4, namely the center line of a cylinder hole in the shell is superposed with the radial line of the shell, when pressure oil enters the plunger cylinder from the oil distribution disc and the shell in normal use, hydraulic pressure generated by the pressure oil acts on the top of the plunger, the hydraulic pressure points to the center of the eccentric wheel (namely the center of the shell) along the center line of the connecting rod, and the hydraulic pressure generates torque to the rotation center of the crankshaft to enable the crankshaft to rotate around the rotation center of the crankshaft, thereby realizing the purpose of converting the hydraulic energy into mechanical energy and outputting the rotating speed and the torque for the working machine. Simultaneously, the plunger and can receive the reaction force of connecting rod, the resultant force behind this reaction force and the hydraulic pressure combined action is the inner wall in vertical direction jar hole, and lateral force promptly, this lateral force is very big to the injury in jar hole inner wall, leads to jar hole inner wall wearing and tearing and shorten the life of pneumatic cylinder at the excessive speed easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide a can reduce the long service life's of plunger to jar hole inner wall effort hydraulic motor.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a long-life hydraulic motor comprises a shell, a crankshaft and a plurality of plunger-connecting rod assemblies radially distributed along the circumferential direction of the crankshaft, wherein a plunger in each plunger-connecting rod assembly slides in a corresponding cylinder hole of the shell, each plunger is provided with a ball socket in spherical hinge connection with a ball head of each connecting rod, and a cylindrical surface at the bottom of each connecting rod is in contact with a corresponding eccentric wheel on the crankshaft, and the long-life hydraulic motor is characterized in that: the center line of each cylinder hole deflects towards the rotation direction of the crankshaft, so that a small included angle is formed between the center line of the cylinder hole and the radial line of the shell.

Preferably, the small included angle is 2 to 4 degrees. Wherein the small included angle is preferably 3 degrees.

In each of the above aspects, it is further improved that the ball and socket surface of each plunger is provided with a plurality of oil reservoirs. Increase the lubrication to the bulb, can also store impurity simultaneously.

Preferably, each of the oil reservoirs is perpendicular to the centerline of each cylinder bore to enable storage of more oil and contaminants.

Compared with the prior art, because the utility model provides a jar hole central line deflects to the direction of rotation of bent axle, has designed a small-angle's skew for radial line promptly, and this makes when normal use, and the connecting rod diminishes to the reaction force of plunger and the contained angle between the central line in jar hole to make hydraulic pressure force and reaction force's resultant force diminish, reduce the effort (also lateral force) of the inner wall in jar hole promptly (so the utility model discloses can reduce the frictional force of plunger and jar hole inner wall, avoid jar hole inner wall's too fast wearing and tearing effectively, thereby reach extension pneumatic cylinder life's purpose.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of the housing of FIG. 1;

FIG. 3 is a schematic structural view of the plunger of FIG. 1;

fig. 4 is a schematic structural diagram of a housing in the prior art.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Fig. 1 to 3 show a preferred embodiment of the hydraulic motor according to the present invention, which includes a housing 1, a crankshaft 2, a plurality of plunger-connecting rod assemblies radially distributed along the circumferential direction of the crankshaft 2, an oil distribution structure, a cylinder head and a cover, wherein the oil distribution structure, the cylinder head and the cover, and the installation of the crankshaft are all the prior art, and therefore these components are omitted from the drawings and will not be described in detail here.

The housing 1 has an odd number of cylinder holes 11 as in the prior art, and as can be seen from fig. 1 and 2, the present embodiment is designed with five cylinder holes 11 and correspondingly five plunger-link assemblies, each plunger-link assembly includes a plunger 3 and a link 4, the plunger 2 slides in the corresponding cylinder hole 11 of the housing, each plunger 3 has a ball socket 31 in spherical hinge connection with the ball 41 of the respective link 4, and the cylindrical surface of the bottom of each link 4 contacts with the corresponding eccentric 21 on the crankshaft 2, and the present embodiment is mainly improved in the design of the cylinder holes 11, that is, the center line L1 of each cylinder hole 11 is deflected by a small angle towards the rotation direction of the crankshaft 2. The direction of rotation of the crankshaft 2 is indicated by the arrow in fig. 1, i.e. the direction of rotation of the crankshaft 2 is clockwise in the present embodiment. Taking the lowermost cylinder bore as an example to illustrate the deflection direction of the cylinder bore, the center line L1 of cylinder bore 11 is deflected to the left, so that the center line L1 of cylinder bore 11 forms a small included angle α with the radial line L2 of housing 1, see fig. 1 and 2, where the small included angle α is 2 ° to 4 °, preferably 3 °. After the design, in the working process, referring to fig. 1, the two left plungers 3 sequentially receive the hydraulic pressure and then slide inwards along the cylinder holes and act on the respective connecting rods, the two left connecting rods provide the main force F1 for the crankshaft, and meanwhile, the corresponding plungers also receive the reaction force F2 from the corresponding connecting rods, at this time, because the cylinder holes 11 deflect a small included angle α, which is equivalent to that the plungers 3 also deflect a small included angle, the included angle between the reaction force of the connecting rods 4 on the plungers 3 and the center line of the cylinder holes 11 is the included angle minus the angle α in the prior art, that is, the resultant force F3 of the hydraulic pressure and the reaction force is reduced, that is, the lateral force of the plungers 3 on the inner wall of the cylinder holes is reduced. Therefore, the embodiment can effectively avoid the over-fast abrasion of the inner wall of the cylinder hole, and the purpose of prolonging the service life of the hydraulic cylinder can be achieved.

Meanwhile, in order to increase the lubrication of the ball head 41 during the working process, the surface of the ball socket 31 of each plunger 3 is provided with a plurality of oil storage grooves 32, as can be seen from fig. 3, the number of the oil storage grooves 32 is two, and each oil storage groove 32 is perpendicular to the center line of each cylinder hole 11 and is distributed at intervals along the axial direction of the plunger 3, so that the oil storage effect is good, and meanwhile, the oil storage grooves can be used for storing impurities to prevent the impurities from abrading the surfaces of the ball head and the ball socket.

Claims

1. A long-life hydraulic motor comprises a shell, a crankshaft and a plurality of plunger-connecting rod assemblies radially distributed along the circumferential direction of the crankshaft, wherein a plunger in each plunger-connecting rod assembly slides in a corresponding cylinder hole of the shell, each plunger is provided with a ball socket in spherical hinge connection with a ball head of each connecting rod, and a cylindrical surface at the bottom of each connecting rod is in contact with a corresponding eccentric wheel on the crankshaft, and the long-life hydraulic motor is characterized in that: the center line of each cylinder hole deflects towards the rotation direction of the crankshaft, so that a small included angle is formed between the center line of the cylinder hole and the radial line of the shell.

2. The hydraulic motor of claim 1, wherein: the small included angle is 2-4 degrees.

3. The hydraulic motor of claim 2, wherein: the small included angle is 3 degrees.

4. The hydraulic motor according to claim 1, 2 or 3, wherein: the surface of the ball socket of each plunger is provided with a plurality of oil reservoirs.

5. The hydraulic motor of claim 4, wherein: each oil reservoir is perpendicular to the center line of each cylinder hole.