Inclined shaft type hydraulic motor plunger adopting spiral oil duct

Abstract

The utility model provides an inclined shaft type hydraulic motor plunger adopting a spiral oil duct, which comprises a plunger body, the plunger body comprises a rod body and a ball head, the ball head comprises an upper hemisphere and a lower hemisphere, the diameter of the upper hemisphere is larger than that of the lower hemisphere, and the upper hemisphere and the lower hemisphere are connected through cross section intersection. According to the plunger, the ball head is formed by combining the two hemispheres with different diameters, so that the radian of the contact position of a spherical hinge pair is changed, the maximum contact stress of the spherical hinge pair is reduced, formation and stability of an oil film are facilitated, and then frictional wear and frictional heat generation of the spherical hinge pair are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic motor technical field, concretely relates to a kind of inclined shaft type hydraulic motor plunger using spiral oil channel. BACKGROUND

[0002] Plunger is one of the important structures of hydraulic motor. Plunger-related kinematic pairs include plunger pairs and ball hinge pairs, which are both major friction pairs during motor operation.

[0003] Current research on plunger kinematic pairs focuses mainly on plunger pairs that cooperate with cylinder bodies, and most of the subjects are hydraulic pumps. There is little research on ball hinge pairs of inclined shaft type hydraulic motors, and even less research on the deformation and stability of oil film in dynamic cooperation.

[0004] Currently, the ball hinge pairs of inclined shaft type hydraulic motor plungers may experience local wear and tear and local high temperatures during high-speed operation due to unstable oil film, resulting in reduced motor efficiency and service life. To reduce friction and wear, avoid local overheating, and form a stable oil film, the plunger structure needs to be designed reasonably. SUMMARY

[0005] Therefore, the utility model aims to provide a kind of inclined shaft type hydraulic motor plunger using spiral oil channel, so that it can provide stable oil film, thereby solving the problems of ball hinge pair wear and overheating.

[0006] The utility model solves the above problems by the following technical means:

[0007] A kind of inclined shaft type hydraulic motor plunger using spiral oil channel, including plunger body, the plunger body includes stem and ball head, the ball head includes upper hemisphere and lower hemisphere, the diameter of upper hemisphere is greater than the diameter of lower hemisphere, upper hemisphere is connected by cross section intersection with lower hemisphere.

[0008] Further, the middle part of the plunger body is provided with an internal oil channel, the top center of the ball head is provided with a plunger hole, and the plunger hole is communicated with the internal oil channel through a damping hole.

[0009] Further, the surface of the upper hemisphere is provided with a spiral oil channel.

[0010] Further, a step is provided between the plunger hole and the starting end of the spiral oil channel.

[0011] Further, the tail end of the spiral oil channel is provided with an equalizing groove.

[0012] Further, the stem includes a transition connector, a cone and a cylinder connected in sequence, the lower hemisphere is connected with the transition connector, and the cylinder is provided with a sealing groove.

[0013] The utility model discloses a beneficial effect:

[0014] 1, the plunger of the inclined shaft type hydraulic motor of the application adopting spiral oil channel, the ball head includes the upper hemisphere and lower hemisphere of integral connection, the diameter of the upper hemisphere is greater than the diameter of the lower hemisphere, thereby change the radian of ball hinge pair contact place, reduce the maximum contact stress of ball hinge pair, be favorable to the formation and stability of oil film, and further reduce the friction and wear and tear and friction heat of ball hinge pair.

[0015] 2, the plunger of the inclined shaft type hydraulic motor of the application adopting spiral oil channel, further, through setting spiral oil channel, strengthen the flow capacity of oil in ball hinge pair, preferably, through setting pressure balance groove balance pressure, reduce the influence of pressure pulsation, make ball hinge pair contact place exist sufficient oil liquid support oil film formation and maintain the stability of oil film, and further improve the heat dissipation efficiency of ball hinge pair, avoid local temperature too high, guarantee the motor work efficiency.

[0016] 3, the plunger of the inclined shaft type hydraulic motor of the application adopting spiral oil channel, further, through setting suitable damping hole and plunger hole, make the hydraulic oil flowing into the inside of ball hinge pair can meet the lubrication and heat dissipation demand of ball hinge pair, and reduce leakage as far as possible.

[0017] In summary, the plunger of the inclined shaft type hydraulic motor of the application adopting spiral oil channel, under the condition of high speed operation can increase the oil film stability of ball hinge pair, reduce the friction and wear and tear, improve the lubrication and heat dissipation effect, guarantee the work efficiency of hydraulic motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further described in connection with the drawings and examples.

[0019] Fig. 1 It is the three-dimensional structure schematic diagram of preferred embodiment of the utility model;

[0020] Fig. 2 It is the top structure schematic diagram of the utility model;

[0021] Fig. 3 It is the cross section structure display drawing of the utility model.

[0022] In the drawing: 1, transition connecting body;2, conical body;3, sealing groove;4, cylinder;5, lower hemisphere;6, upper hemisphere;7 spiral oil channel;8, plunger hole: 9, pressure balance groove;10, step;11, damping hole;12, internal oil channel. DETAILED DESCRIPTION

[0023] The utility model will be further explained in detail through the embodiment. Through these explanations, the characteristics and advantages of the utility model will become more clear and explicit. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment.

[0024] Referring to Figs. 1 to 3 As shown in the figure, the oblique shaft type hydraulic motor plunger of the embodiment adopts a spiral oil channel, which comprises a plunger body, the plunger body comprises a rod body and a ball head, an internal oil channel 12 is arranged in the middle of the plunger body, a plunger hole 8 is arranged in the top center of the ball head, and the plunger hole is communicated with the internal oil channel through a damping hole 11; by arranging appropriate damping holes and plunger holes, the hydraulic oil flowing into the ball hinge pair can meet the lubrication and heat dissipation requirements of the ball hinge pair and reduce leakage as much as possible.

[0025] The ball head comprises an upper hemisphere 6 and a lower hemisphere 5, the diameter of the upper hemisphere is greater than that of the lower hemisphere, and the upper hemisphere and the lower hemisphere are connected through a cross section intersection. In the embodiment, the diameter of the lower hemisphere is 31.5 mm, the diameter of the upper hemisphere is 32 mm, and the two hemispheres intersect at a cross section with a diameter of 27.5 mm. By reducing the arc radian of the upper hemisphere, the maximum contact stress of the ball hinge pair can be further reduced without affecting the cooperation of the ball hinge pair, which is beneficial to the formation and stability of the oil film, thereby reducing the friction and wear of the ball hinge pair and prolonging the service life of the motor.

[0026] The rod body comprises a transition connecting body 1, a conical body 2 and a cylindrical body 4 connected in sequence, the lower hemisphere is connected with the transition connecting body, and a sealing groove 3 is arranged on the cylindrical body, and two sealing grooves are arranged at intervals in the embodiment; during use, the conical body is matched with the motor cylinder body, a sealing ring is arranged in the sealing groove and used as the sealing of the plunger pair, and the arc surface in the middle of the sealing groove can reduce the maximum contact stress of the plunger pair, thereby reducing the friction and wear of the plunger pair.

[0027] As a further improvement of the above technical scheme, a spiral oil channel 7 is arranged on the surface of the upper hemisphere. A step 10 is arranged between the plunger hole and the starting end of the spiral oil channel. The tail end of the spiral oil channel is provided with an equalizing groove 9. In this embodiment, the spiral thread form is a double thread, the rotation direction is the same as that of the motor, and the shape of the spiral oil channel groove body includes but is not limited to a U-shaped groove, a V-shaped groove, a waist-shaped groove, a triangular groove and the like. In the embodiment, the spiral oil channel groove body is a U-shaped groove body. By arranging the spiral oil channel, the flow capacity of the oil in the ball hinge pair is enhanced, preferably, by arranging the equalizing groove to balance the pressure, the influence of pressure pulsation is reduced, there is sufficient oil liquid to support the formation of the oil film at the contact position of the ball hinge pair and maintain the stability of the oil film, the heat dissipation efficiency of the ball hinge pair is further improved, local temperature is prevented from being too high, and the working efficiency of the motor is ensured.

[0028] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application. The technical solutions of the present application should be covered in the scope of the claims of the present application.

Claims

1. A slant-shaft hydraulic motor plunger employing a helical oil passage, comprising a plunger body, the plunger body including a rod and a ball head, characterized in that: The ball head includes an upper hemisphere (6) and a lower hemisphere (5). The diameter of the upper hemisphere (6) is larger than the diameter of the lower hemisphere (5). The upper hemisphere (6) and the lower hemisphere (5) are connected by intersecting sections.

2. The inclined shaft hydraulic motor plunger with a spiral oil passage according to claim 1, characterized in that: An internal oil passage (12) is provided in the middle of the plunger body, and a plunger hole (8) is provided at the top center of the ball head. The plunger hole (8) is connected to the internal oil passage through a damping hole (11).

3. The inclined shaft hydraulic motor plunger with a spiral oil passage according to claim 2, characterized in that: The surface of the upper hemisphere (6) is provided with spiral oil channels (7).

4. The inclined shaft hydraulic motor plunger with spiral oil passage according to claim 3, characterized in that: A step (10) is provided between the plunger hole (8) and the starting end of the spiral oil passage (7).

5. The inclined shaft hydraulic motor plunger with a spiral oil passage according to claim 4, characterized in that: The tail end of the spiral oil passage (7) is provided with a pressure equalization groove (9).

6. The inclined shaft hydraulic motor plunger with spiral oil passages according to any one of claims 1-5, characterized in that: The rod body includes a transition connector (1), a cone (2) and a cylinder (4) connected in sequence. The lower hemisphere (5) is connected to the transition connector (1), and a sealing groove (3) is provided on the cylinder.

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