CN2163247Y

CN2163247Y - Suspended shaft radial plunger fuel pump

Info

Publication number: CN2163247Y
Application number: CN 93219527
Authority: CN
Inventors: 周强
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-24
Filing date: 1993-07-24
Publication date: 1994-04-27
Anticipated expiration: 2003-07-24

Abstract

The utility model relates to a suspended shaft type radial plunger fuel pump. An eccentric short shaft (6) with a suspended arm is arranged on a housing (5) through a bearing (7), and a bearing (12) is arranged at the eccentric position; the outer sleeve of the eccentric short shaft is contacted with the end surface (13) of a plunger piston which is radially distributed, but no relative slip is generated; a spring (16) is arranged in the cavity of the plunger piston, the reciprocating movements of the plunger piston can be realized under the actions of the spring (16) and the eccentric shaft, and accordingly, low pressure fuel can be converted to high pressure fuel. The utility model has the advantages that the service life is more than two times longer than the service life of various axial plunger pumps; the weight is only 20% to 60% of the weight of plunger pumps of the same specification; the production cost is 30% to 70% of the production cost of existing plunger pumps.

Description

Suspended shaft radial plunger fuel pump

The utility model relates to a kind of oil pump, belongs to mechanical field.

Plunger-type fuel pump is a kind ofly to cause the variation of sealed volume by the to-and-fro motion of plunger in the pump housing, constantly oil suction and press the device of oil.This oil pump has multiple structural type at present, and wherein topmost have two kinds, and a kind of is that plunger is evenly distributed along circumference, the axial plunger oil pump of plunger axis and pump housing parallel axes; Another kind is that plunger is planar by the radial plunger oil pump of the uniform arrangement of radial radiation.These two kinds of oil pumps have in use been brought into play good effect, thus adopted widely by people, but also existing following deficiency, its structure of axial plunger oil pump is still complicated, and plunger is easy to wear, thereby its life-span is shorter.Radial plunger oil pump, though the life-span is longer, its structure is more complicated, the also comparatively huge heaviness of volume has all increased difficulty to making maintenance.

Based on the problem that exists in the above-mentioned technology, the purpose of this utility model will propose a kind of simple in structure exactly, and wearing and tearing are little in the work, long service life, the technical solution of small and light plunger-type fuel pump, the technological scheme that Here it is hangs the shaft type radial plunger oil pump is to solve the deficiencies in the prior art.

Basic design of the present utility model is, will be by the plunger to-and-fro motion of eccentric wheel, swash plate or bent axle drive, and make the relative movement that plunger one end takes place and the heavy wear that causes, change eccentric shaft and plunger one end into relative movement or the only extremely small relative movement of generation do not take place.Thereby, between them not or have and seldom having wearing and tearing to take place, thereby structurally adopt plunger slide relative distance little the working life of having improved plunger-type fuel pump widely, the form of a plurality of plungers continuous action radially makes structure become simple and reaches little, the lightweight purpose of volume.

The outstanding shaft type radial plunger oil pump that the utility model proposed mainly is by the eccentric of pump and planar constituted by plunger, oil inlet hole, oil outlet and the oil sealing of the uniform arrangement of radial radiation.It is characterized in that: realize that the plunger to-and-fro motion is by eccentric minor axis of cantilever type ［ 6 ］ and the coefficient result of spring ［ 16 ］.

Putting eccentric on housing ［ 5 ］ by bearing ［ 7 ］, is the cantilevered eccentric minor axis ［ 6 ］ of its axis by each plunger axis intersection point, at the eccentric position place of eccentric minor axis ［ 6 ］, bearing ［ 12 ］ is housed; Planar by a plurality of plungers of putting in plunger bushing ［ 15 ］［ 14 ］ of the uniform arrangement of radial radiation, be one and have cavity from an end, and the end face of its closed end ［ 13 ］ contacts with the overcoat of bearing ［ 12 ］, the bottom connection that is provided with an end and plunger cavity in the plunger cavity touches, the other end then with the contacted spring in groove ［ 3 ］ end ［ 16 ］ of oil sealing ［ 2 ］; Oil sealing ［ 2 ］ is a star plane oil sealing ［ 2 ］ that is between spring ［ 16 ］ and the spring ［ 19 ］ and has groove ［ 3 ］, and this oil sealing ［ 2 ］ is realized the one-way flow of high pressure oil under the effect of spring ［ 19 ］ and spring ［ 16 ］; One end of spring ［ 19 ］ contacts with oil sealing ［ 2 ］, and the spring seat ［ 20 ］ in the other end and the circular groove that is contained in rubber oil sea ［ 1 ］［ 21 ］ contacts; Oil sealing ［ 1 ］ is a dish-shaped rubber oil sea that is provided with the inclined-plane on the edge of circular groove ［ 21 ］, under the effect of spring ［ 19 ］, is compressed on the housing ［ 5 ］; On the pump housing ［ 11 ］, also be provided with filler opening ［ 8 ］, annular oil trap ［ 9 ］, and shut by annular gland ［ 10 ］ and O RunddichtringO ［ 18 ］.Being further characterized in that of outstanding shaft type radial plunger oil pump, on plunger bushing ［ 15 ］, be provided with a plurality of oil inlet holes ［ 4 ］, the pump housing ［ 11 ］ (is generally more than 5 or 5) more for a long time at plunger, be provided with annular oil trap ［ 9 ］, (be generally below 4 or 4) more after a little while, then be provided with oil trap ［ 24 ］ at plunger.

Major advantage of the present utility model is, 1. because oil sealing ［ 2 ］ and plunger bushing ［ 15 ］ end face are plane contact, again owing to not having slide relative between plunger end face ［ 13 ］ and the bearing outside, therefore, long service life generally is more than 2 times of various axial piston pumps; 2. in light weight, 20～50% of the various plunger pumps that general deadweight only is a same specification; 3. cost is low, only is 30～70% of same specification plunger pump generally.

The utility model description of drawings is as follows:

Fig. 1 is the utility model profile front elevational schematic.Outstanding shaft type radial plunger oil pump, its housing ［ 5 ］ and the pump housing ［ 11 ］ are by bolted on connection together.

Fig. 2 is the schematic top plan view of Fig. 1.

Fig. 3 is the A-A cross-sectional view of Fig. 2., put on housing ［ 5 ］ cantilevered eccentric minor axis ［ 6 ］ by bearing ［ 7 ］, bearing ［ 12 ］ is housed at the eccentric position place of minor axis.Plunger bushing ［ 15 ］ then is framework ［ 23 ］ lining that is installed in the pump housing ［ 11 ］ top.Plunger ［ 14 ］ then is installed in the plunger bushing ［ 15 ］, in the cavity of plunger ［ 14 ］, contact with the overcoat of bearing ［ 12 ］ by the end face ［ 13 ］ that spring ［ 16 ］, plunger ［ 14 ］ are housed, under the acting in conjunction of spring ［ 16 ］ and eccentric minor axis ［ 6 ］, realize the to-and-fro motion of plunger ［ 14 ］.At this moment, plunger end face ［ 13 ］ does not have slide relative with the outer inner room of bearing ［ 12 ］.One end of spring ［ 16 ］ contacted with the end of plunger ［ 14 ］ cavity, the other end contacted with the end of the groove ［ 3 ］ of oil sealing ［ 2 ］, and oil sealing ［ 2 ］ is a star plane oil sealing, under the acting in conjunction of spring ［ 16 ］ and spring ［ 19 ］, with plunger bushing ［ 15 ］ be that the plane seals plane contact.One end of spring ［ 19 ］ contacts with oil sealing ［ 2 ］, and the other end spring seat ［ 20 ］ interior with being located at dish-shaped rubber oil sea ［ 1 ］ circular groove ［ 21 ］ contacts, and under the effect of spring ［ 19 ］, oil sealing ［ 1 ］ is squeezed on the housing ［ 5 ］, produces sealing.On plunger bushing ［ 15 ］, also be provided with a plurality of oil inlet holes ［ 4 ］.Also be provided with oil outlet ［ 17 ］ and annular oil trap ［ 9 ］ on the pump housing ［ 11 ］, this annular oil trap ［ 9 ］ seals by annular gland ［ 10 ］ and O shape seal ［ 18 ］.Oil outer is to enter in the plunger pump by the filler opening ［ 8 ］ that is located on the housing ［ 5 ］, exports high pressure oil by the oil outlet ［ 22 ］ with annular concentrates groove ［ 9 ］ to communicate that is located on the pump housing ［ 11 ］.

Fig. 4 is the schematic top plan view of oil sealing ［ 2 ］.It is a star plane oil sealing.Heart position is provided with a groove ［ 3 ］ structure therein.

Fig. 5 is the A-A cross-sectional view of Fig. 4, is smooth plane in the outside of groove ［ 3 ］, then is an inclined-plane at Xing Jiaochu.To guarantee under the effect of spring ［ 16 ］ and spring ［ 19 ］, realize the one-way flow of high pressure oil.

Fig. 6 is the cross-sectional configuration schematic representation of oil sealing ［ 1 ］.It is a dish-shaped rubber oil sea, and its dish-shaped edge is an inclined-plane, like this, under the effect of oil pressure, can ownly extremely can not outflow oil sealing.Nose circle in " dish " ［ 21 ］ is for assembling spring seat ［ 20 ］ usefulness.

Fig. 7 is a kind of plunger provided by the utility model pump housing ［ 11 ］ form structure schematic top plan view more for a long time.Framework ［ 23 ］ by dress plunger bushing ［ 15 ］ distributes radially as can be seen.

Fig. 8 is the A-A cross-sectional view of Fig. 7.Figure middle pump body ［ 11 ］ is provided with annular oil trap ［ 9 ］, framework ［ 23 ］.

Fig. 9 is the form structure schematic representation of the another kind of plunger provided by the utility model pump housing ［ 11 ］ more after a little while.Filler opening ［ 8 ］ is located on the pump housing ［ 11 ］.Also be provided with the framework ［ 23 ］ of assembling plunger bushing ［ 15 ］ usefulness in the pump housing ［ 11 ］ top.

Figure 10 is the A-A cross-sectional configuration schematic representation of Fig. 9.Find out that the filler opening among the figure ［ 8 ］, oil outlet ［ 22 ］ and the framework of using by the dress plunger bushing ［ 23 ］ all are located on the pump housing ［ 11 ］, simultaneously, do not establish annular oil trap, and are provided with the straight-through oil trap ［ 24 ］ that intersects.

Below by instantiation, further specify details of the present utility model.

After the axle of motor injects the eccentric minor axis of cantilever type ［ 6 ］, connect power supply, under the drive of motor, eccentric minor axis ［ 6 ］ just begins to rotate, under the effect of eccentric shaft, make and just pressure spring ［ 16 ］ and in plunger bushing ［ 15 ］, promoting forward of the contacted plunger of overcoat ［ 14 ］ of bearing ［ 12 ］, at this moment, oil in the plunger bushing ［ 15 ］ is extrapolated with high pressure, when plunger ［ 14 ］ during with the sealing of the oil inlet hole ［ 4 ］ of plunger bushing ［ 15 ］, this high pressure oil can only be pushed oil sealing ［ 2 ］ open and go out, but because the pressure of spring ［ 19 ］, can only and flow out at oil sealing ［ 2 ］ and plunger bushing ［ 15 ］ generation certain interval, flow into annular oil trap ［ 9 ］ through oil outlet ［ 17 ］ and pump high pressure oil through oil outlet ［ 22 ］ again.When eccentric shaft ［ 6 ］ is rotated further, at this moment, plunger ［ 14 ］ is under the effect of spring ［ 16 ］, be pushed to again and original opposite direction, elongation effect owing to spring ［ 19 ］ makes the interior meeting of cavity of the plunger ［ 14 ］ of oil sealing ［ 2 ］ sealing produce negative pressure again, continue to move, plunger ［ 14 ］ is just opened oil inlet hole ［ 4 ］, oil enters in the plunger bushing ［ 15 ］ automatically, at this moment, and under the effect of eccentric shaft ［ 6 ］, plunger ［ 14 ］ has begun anti-phase motion again, recompression spring ［ 16 ］, when surpassing certain pressure, high pressure oil will leave the pump housing by original way again.Afterwards, plunger ［ 14 ］ begins next back and forth movement again, like this, effect at eccentric shaft ［ 6 ］ and spring ［ 16 ］, keep plunger ［ 14 ］ in plunger bushing ［ 15 ］, constantly to-and-fro motion, oil constantly enter oil inlet hole ［ 4 ］ from oil-feed tank ［ 8 ］ and open oil sealing ［ 2 ］ at last under pressure and enter annular oil trap ［ 9 ］ by oil outlet ［ 17 ］, are exported by oil outlet ［ 22 ］ at last.To-and-fro motion continuously guarantees the continuous supply of high pressure oil at last.

Claims

1, a kind of outstanding shaft type radial plunger oil pump, its structure mainly are by the pump housing, eccentric and are planar constituted by plunger, oil inlet hole, oil outlet and the oil sealing of the uniform arrangement of radial radiation.It is characterized in that:

A. putting eccentric on housing [5] by bearing [7], is the cantilevered eccentric minor axis [6] of its axis by each plunger axis intersection point, at the eccentric position of minor axis bearing [12] is housed.

B. planar by a plurality of plungers of putting in plunger bushing [15] [14] of the uniform arrangement of radial radiation, be one and have cavity from an end, and the end face of its closed end [13] contacts with the overcoat of bearing [12], in the cavity of plunger, be provided with that bottom connection touches, the other end then with the contacted spring in the end [16] of the groove [3] of oil sealing [2].

C. oil sealing [2] is one and is in the star plane oil sealing that has groove [3] between spring [16] and the spring [19].

D. an end of spring [19] contacts with oil sealing [2], and the spring seat [20] in the other end and the circular groove that is contained in rubber oil sea [1] [21] contacts.

E. oil sealing [1] is a dish-shaped rubber oil sea that is provided with the inclined-plane on circular groove [21] edge, under the effect of spring [19], is compressed on the housing [5].

F. on the pump housing [11], also be provided with oil-feed tank [8], annular oil trap [9], and shut by annular gland [10] and O-ring seals [18].

2, outstanding shaft type radial plunger oil pump according to claim 1 is characterized in that: be provided with a plurality of oil inlet holes ［ 4 ］ on plunger bushing ［ 15 ］.

3, outstanding shaft type radial plunger oil pump according to claim 1, it is characterized in that: the pump housing plunger more for a long time (generally more than 5 or 5) be provided with annular oil trap ［ 9 ］, plunger (is generally below 4 or 4) more after a little while and is provided with oil trap ［ 24 ］.