CN2318426Y

CN2318426Y - Axial plunger pump

Info

Publication number: CN2318426Y
Application number: CN 97230568
Authority: CN
Inventors: 彭学
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-18
Filing date: 1997-12-18
Publication date: 1999-05-12
Anticipated expiration: 2007-12-18

Abstract

The utility model relates to an axial plunger pump which comprises a main shaft bearing which is arranged in an upper casing body, an axial thrust bearing, a rotating shaft and a pump body bearing and an axial plunger which are arranged in a lower pump body. A movable swash plate which is provided with an opening is sheathed on the outside of the rotating shaft, the swash plate is connected to the rotating shaft through a hinge shaft, a spring is arranged on the rotating shaft, one end of the spring is connected with one end of a push rod, the shaft center of the push rod deviates from the shaft center of the hinge shaft, the other end of the push rod is pressed on the swash plate, and a pressing bearing is arranged under the swash plate. Compared with the prior art, the output flow rate is increased three times under low pressure, and the upper limit of delivery pressure is increased by 40%.

Description

Axial piston pump

The utility model relates to the plunger type liquid pump, and especially a kind of rotation by rotating shaft drives the axial piston pump that pushing bearing pushing plunger carries out work.

The liquid pump that is used for high pressure output adopts plunger-type structure mostly, this pump in use, its delivery pressure is from low to high under many circumstances, when low pressure export, people wished to give full play to its driving power, the acquisition big infusion flow of trying one's best; And when output end pressure was high, people then more paid attention to obtaining to try one's best high pressure.We know: when driving power one timing, output flow is big more, and then Shu Chu pressure is just more little; Otherwise, obtain higher delivery pressure, then must the sacrificial section output flow.Existing axial piston pump, ZB2 * 2-500 type electric oil pump as the production of Liuzhou city Construction Machinery Plant, such liquid pump is that an inclined-plane is set in rotating shaft, a pushing bearing (axial thrust bearing) parallel with the inclined-plane is housed under the inclined-plane, rotation by rotating shaft drives the plunger work that the pushing of pushing bearing axially is provided with, the rotating shaft inclined-plane of this structure and the angle of inclination of plane of rotation are constant, it also is constant being contained in the end face of pushing bearing of this face and the angle of inclination of plane of rotation, therefore, the stroke of pushing plunger is constant, its liquid output flow by the rotating speed decision of rotor, can not satisfy above-mentioned needs basically.

The purpose of this utility model provide a kind of can be when delivery pressure be low the stroke of its plunger bigger, its plunger stroke is less to obtain than the Large Volume Parenteral flow and when delivery pressure is high, to obtain the axial piston pump of higher infusion pressure.

For achieving the above object, the axial piston pump of the utility model indication, include and be contained in main shaft bearing, the axial thrust bearing in the upper shell and be contained in the interior parts same as the prior art such as pump housing bearing, axial plunger, rotating shaft and pushing bearing of lower pump body, in addition, outside rotating shaft, be with the swash plate of the activity that wherein is provided with opening, swash plate is connected in the rotating shaft by hinge, spring also is housed in the rotating shaft, one end of the tappet in one end of spring and axis deviation hinge axle center joins, the other end of tappet be pressed in swash plate above, described pushing bearing is contained under the swash plate.

Such scheme is further said: described spring can be contained in the cylinder sleeve, the end that described tappet is pressed on the swash plate stretches out outside the cylinder sleeve, the end that tappet is connected with spring is provided with a piston that cooperates with cylinder sleeve bore, between tappet and the cylinder sleeve seal ring is housed, seal washer is equipped with in the joint of cylinder sleeve and rotating shaft, and damping oil is housed in the cylinder sleeve; Described swash plate bottom, in the opening both sides otic placode can be set, otic placode is provided with the otic placode hole, the corresponding hinging hole that is provided with in the rotating shaft, and hinge penetrates in otic placode hole and the hinging hole, and swash plate is connected in the rotating shaft, and swash plate can be rotated to change the angle of inclination around hinge.

Owing to adopted such scheme, the utility model is compared with the ZB4500 type electric oil pump of prior art, and under the situation of identical driving power: when low-pressure was exported, the utility model was bigger 3 times than the output flow of prior art; Its delivery pressure upper limit is higher by 40% than the delivery pressure of prior art.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the utility model embodiment's a structural representation.

Fig. 2 is the structural representation of the utility model embodiment rotor.

Fig. 3 is that the A of the utility model embodiment rotor is to view.

Fig. 4 is the worm's eye view of swash plate among the utility model embodiment.

Fig. 5 is the plan view of swash plate among the utility model embodiment.

Fig. 6 is the structural representation of cylinder sleeve among the utility model embodiment.

The invention will be further described below in conjunction with the accompanying drawing example:

In the example shown in Figure 1, the utility model includes upper shell 4 and interior main shaft bearing 15 thereof, axial thrust bearing 13, lower pump body 1 and interior pump housing bearing 2 thereof, axial plunger 3, parts same as the prior art such as rotating shaft 14 and pushing bearing 5, different is: the swash plate 6 of the described rotating shaft 14 outer activities of being with, swash plate 6 is connected in the rotating shaft 14 by hinge 16, spring 11 also is housed in the rotating shaft 14, one end of the tappet 7 in one end of spring 11 and axis deviation hinge 16 axle center joins, the other end of tappet 7 be pressed in swash plate 6 above, spring 11 is contained in the cylinder sleeve 9, the end that described tappet 7 is pressed on the swash plate 6 stretches out outside the cylinder sleeve 9, the end that tappet 7 is connected with spring 11 is provided with a piston 10 that cooperates with cylinder sleeve 9 endoporus, between tappet 7 and the cylinder sleeve 9 seal ring 8 is housed, cylinder sleeve 9 is equipped with seal washer 12 with the joint of rotating shaft 14, in the cylinder sleeve 9 damping oil is housed, described pushing bearing 5 is contained in swash plate 6 times.

Rotating shaft 14 shown in Fig. 2,3, the position structure that position and the bottom that its top is used to install main shaft bearing 15, axial thrust bearing 13 is used to install pump housing bearing 2 is identical with the rotating shaft of prior art, the middle part of rotating shaft 14 is a planar, be provided with the room that cylinder sleeve 9 is installed in the one side in axle center and screw 18 is installed, be provided with the hinging hole 17 that is used to install hinge 16 in the middle and lower part.

Swash plate 6 shown in Fig. 4,5, its top are discoid, are provided with elongated opening 19 in dish, and its middle part is provided with the shaft shoulder 20 that above-mentioned pushing bearing 5 is installed, and its underpart is provided with otic placode 21 in the both sides of opening 19, and otic placode 21 is provided with otic placode hole 22.Above-mentioned hinge 16 is exactly by penetrating this hole and hinging hole 17 is connected in swash plate 6 on the rotating shaft 14.

Cylinder sleeve 9 shown in Figure 6, one end are provided with the bar hole 23 of stretching out for above-mentioned tappet 7, are provided with the seal groove 24 that above-mentioned seal ring 8 is installed in this hole, and its other end opening is provided with the mounting hole 25 corresponding with above-mentioned screw 18 in the opening both sides.

During the utility model work, when delivery pressure is low, axial plunger 3 is low by the downward active force of 7 pairs of swash plates 6 of tappet than spring 11 by the upwards active force of 5 pairs of swash plates 6 of pushing bearing, swash plate 6 (is watched from Fig. 1 counterclockwise around hinge 16, as follows) rotate downward-sloping, until above-mentioned balance between two forces, the angle of plane of rotation that pushes the end face of bearing 5 and rotating shaft 14 this moment is bigger, and the stroke of axial plunger 3 is big, output flow is big; Otherwise, when delivery pressure increases, axial plunger 3 increases by the active force of 5 pairs of swash plates 6 of pushing bearing, swash plate 6 clockwise rotates around hinge 16 and is inclined upwardly, until balancing each other with the downward active force of spring 11 by 7 pairs of swash plates 6 of tappet, the angle that push the plane of rotation of the end face of bearing 5 and rotating shaft 14 this moment diminishes, and the stroke of axial plunger 3 diminishes, output flow then reduces, and can obtain higher delivery pressure.When delivery pressure is crossed when low or too high, swash plate 6 all is subjected to the restriction of rotating shaft 14 around the rotation of hinge 16 and reaches capacity on suitable, counter clockwise direction, therefore, this structure compared with prior art, output flow and delivery pressure all can obtain higher CLV ceiling limit value under the identical situation of driving power.Outside spring 11, tappet 7, cylinder sleeve 9 is set, and on the top of tappet 7 piston 10 is set, in cylinder sleeve 9 the dress damping oil, can effectively reduce the sensitivity of the 6 pairs of delivery pressures of swash plate reaction, thereby avoid swash plate 6 to regulate irritated and vibration that take place.

Claims

1. axial piston pump, include the main shaft bearing (15) that is contained in the upper shell (4), axial thrust bearing (13) and be contained in pump housing bearing (2) in the lower pump body (1), axial plunger (3), rotating shaft (14) and pushing bearing (5), it is characterized in that: the outer swash plate (6) that is with the activity that wherein is provided with opening (19) of described rotating shaft (14), swash plate (6) is connected in the rotating shaft (14) by hinge (16), spring (11) also is housed in the rotating shaft (14), one end of the tappet (7) in one end of spring (11) and axis deviation hinge (16) axle center joins, the other end of tappet (7) be pressed in swash plate (6) above, described pushing bearing (5) is contained under the swash plate (6).

2. axial piston pump according to claim 1, it is characterized in that: described spring (11) is contained in the cylinder sleeve (9), the end that described tappet (7) is pressed on the swash plate (6) stretches out outside the cylinder sleeve (9), the end that tappet (7) is connected with spring (11) is provided with a piston (10) that cooperates with cylinder sleeve (9) endoporus, between tappet (7) and the cylinder sleeve (9) seal ring (8) is housed, cylinder sleeve (9) is equipped with seal washer (12) with the joint of rotating shaft (14), and cylinder sleeve is equipped with damping oil in (9).

3. axial piston pump according to claim 1 and 2, it is characterized in that: the bottom of described swash plate (6), be provided with otic placode (21) in opening (19) both sides, otic placode (21) is provided with otic placode hole (22), the corresponding hinging hole (17) that is provided with is gone up in rotating shaft (14), hinge (16) penetrates in otic placode hole (22) and the hinging hole (17), and swash plate (6) is connected in the rotating shaft (14).