CN218893834U - Oil pump structure of sewing machine - Google Patents

Abstract

The utility model discloses an oil pump structure of a sewing machine, which comprises a pump body with an oil cavity, a plunger and a rotating shaft, wherein the pump body is provided with an oil inlet, an oil outlet and a plunger channel, the oil pump structure also comprises a shaft sleeve and a sealing ring, the shaft sleeve is sleeved on the rotating shaft, a positioning part and a cam notch are formed on the shaft sleeve, when the oil pump structure is installed, the shaft sleeve is inserted into the pump body and can synchronously rotate with the rotating shaft, the positioning part is matched with the pump body and positions the shaft sleeve in the front-rear direction, and the cam notch is aligned or overlapped with the projection of the plunger in the left-right direction; the sealing ring is sleeved on the periphery of the shaft sleeve and forms sealing with the front side and the rear side of the oil cavity respectively. According to the utility model, the shaft sleeve with the cam notch is arranged, so that the cam notch can be aligned with the plunger by only installing the shaft sleeve in place on the pump body, and the requirement on the installation position of the rotating shaft is reduced, and the operation is simple and convenient; on the other hand, the sealing rings form sealing on the front side and the rear side of the oil cavity, so that the leakage of lubricating oil is effectively prevented.

Description

Oil pump structure of sewing machine

Technical Field

The utility model belongs to the field of industrial sewing machines, and particularly relates to an oil pump structure of a sewing machine.

Background

A sewing machine is a machine that interweaves or sews one or more layers of stitching material by forming one or more stitches on the stitching material with one or more stitching threads. In the working process of the sewing machine, a lubricating device is required to be arranged to continuously supply lubricating oil so as to ensure the working efficiency of each moving part, wherein an oil suction device, also called an oil return device, is often arranged on the sewing machine corresponding to the lubricating device, and is a device for sucking the lubricating oil back to an oil storage device in the sewing machine. In sewing machines, an oil pump is often provided in the lubrication circuit, which is capable of sucking out the lubricating oil from the oil reservoir and also capable of sucking the lubricating oil back into the oil reservoir.

At present, the existing sewing machine adopts an oil pump structure which generally comprises a pump body, a plunger and a rotating shaft, wherein the pump body is provided with an oil inlet, an oil outlet and a plunger channel, the plunger is arranged in the plunger channel and can elastically move, the rotating shaft penetrates through the pump body and is formed with a cam notch aligned with the plunger, and when the sewing machine works, the rotating shaft keeps rotating, and the plunger reciprocates in the plunger channel to form vacuum under the elastic force and the pushing force of the rotating shaft, so that oil suction and oil discharge are realized.

However, in the actual production process, the existing oil pump structure has the following drawbacks:

1. the requirement on the installation position of the rotating shaft is high, the plunger is required to be disassembled every time the rotating shaft is installed, the rotating shaft passes through the pump body and then the position is repeatedly adjusted to ensure that the cam notch and the plunger can be aligned, otherwise, oil cannot be supplied, then the plunger is installed back, the operation is complex, and the installation efficiency is low;

2. there is the clearance between pivot and the pump body, and during the oil feed, lubricating oil oozes easily from the gap.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing an improved oil pump structure of a sewing machine.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the oil pump structure of a kind of Sewing machines, it includes the pump body with oil pocket, plunger, spindle, wherein there are oil inlets, oil outlets, plunger passages communicated with oil pocket separately on the pump body, the plunger activity sets up in plunger passages, the spindle crosses the oil pocket along the fore-and-aft direction, the oil pump structure also includes shaft sleeve and seal ring, wherein the shaft sleeve is set up in spindle, and there are locating parts and cam notch on the shaft sleeve, while installing, the shaft sleeve inserts the pump body and can rotate synchronously with spindle, the locating part cooperates with pump body and positions the shaft sleeve in fore-and-aft direction, and the cam notch aligns or coincides with projection of the plunger in the left-and-right direction; the sealing ring is sleeved on the periphery of the shaft sleeve and forms sealing with the front side and the rear side of the oil cavity respectively.

Preferably, the positioning portion is formed at one end of the sleeve, and is positioned in cooperation with the front side or the rear side of the pump body when the sleeve is inserted into the oil chamber. The arrangement is convenient for operators to observe and confirm that the shaft sleeve is installed in place, and the plunger is ensured to be aligned with the notch of the cam.

Further, the pump body is recessed inwards from the front side surface and forms a positioning groove, wherein a bearing is arranged in the positioning groove, when the pump is installed, the shaft sleeve penetrates through the bearing and is inserted into the pump body, and the positioning part abuts against the bearing at the bottom of the positioning groove. The oil-free pump is arranged in such a way, so that the problem of seizure between the pump body and the shaft sleeve caused by oil free in the pump body is effectively prevented.

Preferably, the positioning groove is recessed inwards from the groove bottom to form a first accommodating groove, the pump body is recessed inwards from the rear side to form a second accommodating groove, and two sealing rings are respectively arranged in the first accommodating groove and the second accommodating groove in a sealing mode. By the arrangement, the protection of the sealing ring is formed, and the service life of the sealing ring is prolonged.

Preferably, a plurality of threaded connection holes are formed in the circumferential direction of the positioning portion, and the shaft sleeve is fixedly connected with the rotating shaft through a bolt member from the plurality of threaded connection holes. The device is easy to assemble and disassemble.

Preferably, the cam notch is an arcuate slot extending around the periphery of the sleeve, wherein the edges of the two ends of the arcuate slot are disposed tangentially to the sleeve surface. By the arrangement, abrasion of the plunger and the shaft sleeve is reduced in the rotating process of the rotating shaft.

Preferably, at least two cam notches are arranged side by side at intervals along the axial direction of the shaft sleeve; the plungers are at least two and are in one-to-one correspondence with the cam notches. This arrangement increases the oil absorption and oil supply.

Preferably, the oil inlet, the plunger channel and the oil outlet are sequentially and alternately distributed around the central line of the oil cavity. The arrangement is convenient for realizing quick oil absorption and oil discharge.

Preferably, the outer end of the plunger channel is provided with a fixing portion, and a spring is provided between the plunger and the fixing portion, wherein the spring has a tendency to keep the plunger moving inwards.

Specifically, the fixing portion gradually narrows from outside to inside, and a third accommodating groove is formed in the plunger, wherein the spring is abutted against the inner side of the fixing portion from one end, and the other end is abutted against the bottom of the third accommodating groove.

Due to the implementation of the technical scheme, compared with the prior art, the utility model has the following advantages:

according to the utility model, the shaft sleeve with the cam notch is arranged, so that the cam notch can be aligned with the plunger by only installing the shaft sleeve in place on the pump body, and the requirement on the installation position of the rotating shaft is reduced, and the operation is simple and convenient; on the other hand, the sealing rings form sealing on the front side and the rear side of the oil cavity, so that the leakage of lubricating oil is effectively prevented.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is an exploded view of an oil pump structure of a sewing machine according to the present utility model;

FIG. 2 is a right side view schematically showing an oil pump structure of the sewing machine of the present utility model;

FIG. 3 isbase:Sub>A schematic view (partially omitted) of the cross-section A-A of FIG. 2;

wherein: 1. a pump body; q, oil cavity; k1, an oil inlet; k2, an oil outlet; t, plunger channel; 10. a positioning groove; c. a bearing; 11. a first accommodating groove; 12. a second accommodating groove;

2. a plunger; 21. a fixing part; 22. a spring; 23. a third accommodating groove;

3. a rotating shaft;

4. a shaft sleeve; 40. a positioning part; 400. a threaded connection hole; 41. a cam notch;

5. and (3) a sealing ring.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

As shown in fig. 1 to 3, the oil pump structure of the sewing machine according to the present embodiment includes a pump body 1, a plunger 2, a shaft 3, a sleeve 4, and a seal ring 5.

Specifically, the pump body 1 has an oil chamber q extending forward and backward, and both sides of the oil chamber q are opened; the pump body 1 is also provided with an oil inlet k1, an oil outlet k2 and a plunger channel t which are respectively communicated with the oil cavity q, wherein the oil inlet k1, the plunger channel t and the oil outlet k2 are sequentially distributed at intervals around the central line of the oil cavity q. The arrangement is convenient for realizing quick oil absorption and oil discharge.

Simultaneously, the oil inlet k1, the oil outlet k2 and the plunger channel t are respectively arranged in parallel and at intervals, wherein each oil inlet k1 and each oil outlet k2 are respectively connected with a nipple so as to facilitate the connection of oil pipes.

In this example, there are two plungers 2 and are movably disposed in two plunger passages t, wherein a fixing portion 21 is disposed at an outer end portion of each plunger passage t, and a spring 22 is disposed between the plungers 2 and the fixing portion 21, and the spring 22 has a tendency to keep the plungers 2 moving inward. In some embodiments, the inner wall of the plunger channel t is threaded, and the fixing portion 21 is a screw, so as to facilitate the disassembly and assembly of the plunger.

Specifically, the fixing portion 21 is gradually narrowed from outside to inside, and a third accommodating groove 23 is formed on the plunger 2, wherein the spring 22 abuts against the inner side of the fixing portion 21 from one end and abuts against the bottom of the third accommodating groove 23 from the other end.

In this example, the rotary shaft 3 traverses the oil chamber q from the opening ports on both sides of the oil chamber q in the front-rear direction.

In this example, the shaft sleeve 4 is sleeved on the rotating shaft 3, and the positioning portion 40 and the cam notch 41 are formed on the shaft sleeve 4, when the pump is installed, the shaft sleeve 4 is inserted into the pump body 1 and can rotate synchronously with the rotating shaft 3, the positioning portion 40 is matched with the pump body 41 and positions the shaft sleeve 4 in the front-rear direction, and the cam notch 41 is aligned with the projection of the plunger 2 in the left-right direction.

Specifically, the positioning portion 40 is formed at one end of the shaft sleeve 4, and a plurality of threaded connection holes 400 are formed in the circumferential direction of the positioning portion 40, and the shaft sleeve 4 is fixedly connected with the rotating shaft 3 through a bolt member from the plurality of threaded connection holes 400. The device is easy to assemble and disassemble.

Meanwhile, when the sleeve 4 is inserted into the oil chamber q, the positioning portion 40 is positioned in cooperation with the front side surface of the pump body 1. The arrangement is convenient for operators to observe and confirm that the shaft sleeve is installed in place, and the plunger is ensured to be aligned with the notch of the cam.

For convenience of implementation, the pump body 1 is recessed inward from the front side surface and forms a positioning groove 10, wherein a bearing c is arranged in the positioning groove 10, when the pump is installed, the shaft sleeve 4 penetrates through the bearing c and is inserted into the pump body 1, and the positioning part 40 abuts against the bearing c at the bottom of the positioning groove 10. The oil-free pump is arranged in such a way, so that the problem of seizure between the pump body and the shaft sleeve caused by oil free in the pump body is effectively prevented.

For further convenience, two cam notches 41 are provided and are arranged in one-to-one correspondence with the two plungers 2, wherein each cam notch 41 is an arc-shaped groove extending around the periphery of the shaft sleeve 4, and edges of two ends of the arc-shaped groove are tangential to the surface of the shaft sleeve 4. By the arrangement, abrasion of the plunger and the shaft sleeve is reduced in the rotating process of the rotating shaft.

In this example, the seal ring 5 is fitted around the outer periphery of the sleeve 4 and forms a seal with the front and rear sides of the oil chamber q, respectively. The sealing ring 5 may be an oil seal of any structure.

Specifically, the positioning groove 10 is recessed inwards from the bottom of the groove and forms a first accommodating groove 11, the pump body 1 is recessed inwards from the rear side surface and forms a second accommodating groove 12, and two sealing rings 5 are respectively arranged in the first accommodating groove 11 and the second accommodating groove 12 in a sealing manner. By the arrangement, the protection of the sealing ring is formed, and the service life of the sealing ring is prolonged.

Therefore, the present embodiment has the following advantages:

1. by arranging the shaft sleeve with the cam notch, the alignment of the cam notch and the plunger can be realized only by installing the shaft sleeve on the pump body in place, so that the requirement on the installation position of the rotating shaft is reduced, and the operation is simple and convenient;

2. the sealing rings form sealing on the front side and the rear side of the oil cavity, so that the leakage of lubricating oil is effectively prevented;

3. through built-in bearing, prevent effectively that the problem of seizing between pump body and the axle sleeve because of this internal oilless of pump.

The present utility model is described in detail above, but the present utility model is not limited to the above-described embodiments. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. The utility model provides an oil pump structure of sewing machine, its includes pump body, plunger, the pivot that has the oil pocket, wherein have on the pump body respectively with oil inlet, oil-out, the plunger passageway that the oil pocket is linked together, the plunger activity sets up in the plunger passageway, the pivot is along fore-and-aft direction transversal joint the oil pocket, its characterized in that: the oil pump structure further comprises a shaft sleeve and a sealing ring, wherein the shaft sleeve is sleeved on the rotating shaft, a positioning part and a cam notch are formed on the shaft sleeve, when the oil pump structure is installed, the shaft sleeve is inserted into the pump body and can synchronously rotate with the rotating shaft, the positioning part is matched with the pump body and positions the shaft sleeve in the front-back direction, and the cam notch is aligned or overlapped with the projection of the plunger in the left-right direction; the sealing ring is sleeved on the periphery of the shaft sleeve and forms sealing with the front side and the rear side of the oil cavity respectively.

2. The oil pump structure of a sewing machine according to claim 1, wherein: the positioning part is formed at one end of the shaft sleeve, and when the shaft sleeve is inserted into the oil cavity, the positioning part is matched and positioned with the front side surface or the rear side surface of the pump body.

3. The oil pump structure of a sewing machine according to claim 2, wherein: the pump body is inwards sunken from the front side and forms a positioning groove, wherein a bearing is arranged in the positioning groove, when the pump is installed, the shaft sleeve penetrates through the bearing and is inserted into the pump body, and the positioning part abuts against the bearing at the bottom of the positioning groove.

4. The oil pump structure of a sewing machine of claim 3, wherein: the locating groove inwards sunken from the tank bottom and forms a first accommodating groove, the pump body inwards sunken from the rear side and forms a second accommodating groove, and two sealing rings are respectively arranged in the first accommodating groove and the second accommodating groove in a sealing mode.

5. The oil pump structure of a sewing machine according to claim 1, wherein: the circumference of location portion is formed with a plurality of threaded connection holes, the axle sleeve from a plurality of threaded connection holes pass through the bolt spare with pivot looks fixed connection.

6. The oil pump structure of a sewing machine according to claim 1, wherein: the cam notch is an arc-shaped groove extending around the periphery of the shaft sleeve, wherein the edges of two end parts of the arc-shaped groove are tangential to the surface of the shaft sleeve.

7. The oil pump structure of a sewing machine according to claim 1 or 6, characterized in that: at least two cam notches are arranged side by side at intervals along the axial direction of the shaft sleeve; the plungers are at least two and are in one-to-one correspondence with the cam notches.

8. The oil pump structure of a sewing machine according to claim 1, wherein: the oil inlet, the plunger channel and the oil outlet are sequentially distributed at intervals around the central line of the oil cavity.

9. The oil pump structure of a sewing machine according to claim 1, wherein: the outer end of the plunger channel is provided with a fixing part, and a spring is arranged between the plunger and the fixing part, wherein the spring has a tendency of keeping the plunger moving inwards.

10. The oil pump structure of a sewing machine of claim 9, wherein: the fixed part gradually narrows from outside to inside, and a third accommodating groove is formed on the plunger, wherein the spring is abutted against the inner side of the fixed part from one end, and the other end is abutted against the bottom of the third accommodating groove.

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