CN219562085U - Bearing and crank pressing device - Google Patents

Abstract

The utility model discloses a bearing and crank pressing device, which comprises a press, a die and a jig, wherein the jig is arranged at the top of a table top of the press, and the die is arranged at the bottom end of a machine head of the press; a positioning shaft inserted into the connecting hole of the crank is arranged in the jig; the die comprises a pressing block, the top end of the pressing block is fixedly connected with the machine head, the bottom end of the pressing block is provided with a containing groove, a magnet is embedded in the bottom surface of the containing groove, the bearing is arranged in the containing groove, and the lower end face of the bearing is exposed from the containing groove. The utility model utilizes the die to fix and correct the bearing posture before press fitting, thereby avoiding the occurrence of local abrasion between the inner wall of the bearing and the outer wall of the connecting shaft and improving the assembly quality.

Description

Bearing and crank pressing device

Technical Field

The utility model relates to the technical field of air compressor cylinder assembly, in particular to a bearing and crank pressing device.

Background

The crank is used in the air compressor to transfer the torque of the motor to convert the rotational motion of the shaft into reciprocating motion of the connecting rod piston assembly. The crank receives the combined action of centrifugal force and reciprocating inertia force in the rotating process, and all parts of the crank must reach the stress balance, otherwise the vibration amplitude is easy to increase, so that the noise of the air compressor is increased. The stress balance can be ensured by optimizing the structural parameters of the crank and the connecting structural parameters of the piston and the motor, and the stress balance can also be ensured by eliminating assembly errors by optimizing the assembly process in the cylinder assembly stage.

The crank A shown in fig. 1 comprises an offset connecting shaft A1, an eccentric connecting hole A2 is formed in the connecting shaft, a bearing B is required to be assembled outside the connecting shaft, and the assembly quality of the connecting shaft and the bearing can directly influence the stress condition of the crank in the moving process. The assembly of the connecting shaft and the bearing is generally completed in a press, a worker sleeves the bearing on the connecting shaft of the crank, and the press drives the pressing block to downwards press the bearing on the connecting shaft. In the process, if the bearing is inclined at the initial placement position of the connecting shaft, the pressing surface of the pressing block cannot be in full contact with the bearing surface of the bearing, so that abrasion can occur between the bearing and the connecting shaft, and the balance of the rotary motion of the crank is affected.

Disclosure of Invention

The utility model aims to solve the technical problems that: how to ensure that the pressing surface of the pressing block is completely contacted with the bearing surface of the bearing, and avoid the abrasion condition of the bearing and the connecting shaft.

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

the bearing and crank pressing device comprises a press, a die and a jig, wherein the jig is arranged at the top of a table top of the press, and the die is arranged at the bottom end of a machine head of the press; a positioning shaft inserted into the connecting hole of the crank is arranged in the jig; the die comprises a pressing block, the top end of the pressing block is fixedly connected with the machine head, an accommodating groove is formed in the bottom end of the pressing block, a magnet is embedded in the bottom surface of the accommodating groove, a bearing is arranged in the accommodating groove, and the lower end face of the bearing is exposed out of the accommodating groove.

Preferably, four magnets which are arrayed in equal angles around the central axis of the accommodating groove are arranged in the groove bottom surface of the accommodating groove.

In the technical scheme, the bearing is arranged in the die before press fitting, and is sleeved on the connecting shaft of the crank in a horizontal posture, so that the pressing surface of the pressing block is ensured to be in full contact with the bearing surface of the bearing, and the abrasion condition of the bearing and the connecting shaft is avoided.

The utility model also comprises the following preferable technical scheme:

preferably, the jig comprises a jig plate and a positioning shaft, wherein the positioning end of the positioning shaft protrudes out of the top surface of the jig plate, a U-shaped groove is respectively formed in the left end and the right end of the jig plate, a threaded rod of a bolt clamped in a table top of the press machine penetrates through the U-shaped groove, and a nut sleeved on the threaded rod is screwed to fix the jig plate on the top of the table top.

Further, an insert is arranged in the jig plate, and the positioning shaft is fixed in the insert.

In this technical scheme, the fixed mounting mode of tool board on the press is simple swift to through changing the locating shaft that corresponds of mold insert alright change according to the crank model, need not to dismantle the tool board, the model of being convenient for switches production.

Preferably, a guide mechanism positioned beside the positioning shaft is arranged at the top of the jig plate; the guide mechanism comprises a first plate, a second plate, a third plate and a fourth plate which are sequentially arranged and parallel to each other, the first plate is positioned between the positioning shaft and the second plate, the first plate and the third plate are fixedly connected with the jig plate, a transverse connecting rod penetrating through the third plate connects the second plate with the fourth plate, and a spring is sleeved on the connecting rod positioned between the second plate and the third plate; a sleeve is arranged in the first plate in a penetrating way, one end of the sleeve is connected with the second plate, and the other end of the sleeve is provided with a through hole; elastic steel balls are arranged in the sleeve, and when the elastic steel balls are in an unpressurized state, part of the steel balls are exposed out of the through holes.

Preferably, a handle is provided in the fourth plate.

In this technical scheme, after the staff overlaps the crank dress on the location axle, the elasticity steel ball card is fixed a position the crank in the round hole of crank side, so alright assurance crank put the position and be accurate completely, improved bearing and crank press-fit quality.

Compared with the prior art, the utility model has the beneficial effects that:

1. the bearing posture is fixed and adjusted before the die is pressed, so that the local abrasion between the inner wall of the bearing and the outer wall of the connecting shaft is avoided, and the assembly quality is improved;

2. the connecting hole and the round hole in the crank are utilized to bidirectionally position the crank, so that the position accuracy of the crank is ensured, and the press-fitting quality of the bearing and the crank is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below.

FIG. 1 is a block diagram of a prior art bearing and crank;

FIG. 2 is a block diagram of a pressing device in an embodiment;

FIG. 3 is a cross-sectional view of a mold in an embodiment;

FIG. 4 is a schematic diagram of another pressing device according to the embodiment;

fig. 5 is a cross-sectional view of the guide mechanism in the embodiment.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the embodiments.

Examples

The bearing and crank press assembly shown in fig. 2 includes a press 10, a die 20 and a jig 30, the jig being mounted on the top of the press table, the die 20 being mounted on the bottom end of the press head.

The jig comprises a jig plate 31 and a positioning shaft 32, wherein the positioning end of the positioning shaft protrudes out of the top surface of the jig plate, and is matched with the connecting hole A2 of the crank. The left and right ends of the jig plate are respectively provided with a U-shaped groove 33, a threaded rod of a bolt clamped in the table top of the press machine penetrates through the U-shaped groove, and a nut 34 sleeved on the threaded rod is screwed down to fix the jig plate on the top of the table top. Preferably, be provided with the insert 35 in the tool board, location axle 32 is fixed in the insert, through changing the insert alright change corresponding location axle according to the crank model, need not to dismantle the tool board, the model of being convenient for switches production.

Referring to fig. 3, the die comprises a pressing block 21, wherein the top end of the pressing block is fixedly connected with the machine head 12, the bottom end of the pressing block is provided with a containing groove 22, and four magnets 23 which are arrayed at equal angles around the central axis of the containing groove are embedded in the bottom surface of the containing groove. The staff places the bearing in the accommodating groove, the upper end face of the bearing is attached to the bottom face of the accommodating groove, the lower end face of the bearing is exposed out of the accommodating groove, and the bearing is adsorbed by the magnet and cannot fall from the accommodating groove; the staff places the crank in the tool according to setting for the direction, and the locating shaft inserts in the connecting hole with bent type location, and the staff steps on the foot switch 11 of press, and the aircraft nose descends with the bearing pressure equipment on the connecting axle of crank. The bearing and the connecting shaft are in interference fit, and the position of the bearing cannot be affected by the magnet in the ascending process of the machine head.

The connecting hole of the crank in fig. 1 is eccentrically arranged relative to the connecting shaft, and the direction of the crank must be adjusted by a worker before or after the crank is placed on the jig plate, so that the bearing can be correctly sleeved on the connecting shaft.

In this embodiment, a guiding mechanism 40 (as shown in fig. 4) located beside the positioning shaft is disposed at the top of the jig plate, and an elastic steel ball is disposed in the guiding mechanism, so that after the crank is sleeved on the positioning shaft, the elastic steel ball is clamped in a round hole A3 on the side surface of the crank to position the crank, thereby ensuring that the placement position of the crank is completely correct. The specific structure of the guide mechanism is as follows:

referring to fig. 5, the guiding mechanism includes a first plate 41, a second plate 42, a third plate 43 and a fourth plate 44 which are sequentially arranged and parallel to each other, the first plate is located between the positioning shaft and the second plate, the first plate and the third plate are fixedly connected with the jig plate, a transverse connecting rod 45 penetrating through the third plate connects the second plate with the fourth plate, and a spring 46 is sleeved on the connecting rod located between the second plate and the third plate; a sleeve 47 is arranged in the first plate in a penetrating way, one end of the sleeve is connected with the second plate, the other end of the sleeve is provided with a through hole, a spring steel ball 48 is arranged in the sleeve, and part of the steel ball is exposed out of the through hole in an unpressed state. The staff encases the crank on the locating shaft, lightly rotates the crank, and when the through hole of crank side rotates to the steel ball position, the thrust that the crank applyed to the steel ball disappears, and the steel ball exposes the card from the through hole and advances in the through hole of crank and fix a position the crank.

After the press-fitting of the crank and the bearing is completed, the worker holds the handle 49 in the fourth plate and pulls the sleeve backwards, the steel balls withdraw from the through holes of the crank, the handle is loosened, and the fourth plate and the sleeve automatically reset under the action of the springs.

Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The bearing and crank pressing device is characterized by comprising a press, a die and a jig, wherein the jig is arranged at the top of a table top of the press, and the die is arranged at the bottom end of a machine head of the press; a positioning shaft inserted into the connecting hole of the crank is arranged in the jig; the die comprises a pressing block, the top end of the pressing block is fixedly connected with the machine head, an accommodating groove is formed in the bottom end of the pressing block, a magnet is embedded in the bottom surface of the accommodating groove, a bearing is arranged in the accommodating groove, and the lower end face of the bearing is exposed out of the accommodating groove.

2. The bearing and crank pressing apparatus according to claim 1, wherein four magnets are provided in a groove bottom surface of the accommodation groove in an equiangular array around a central axis of the accommodation groove.

3. The bearing and crank pressing device according to claim 1, wherein the jig comprises a jig plate and a positioning shaft, positioning ends of the positioning shaft protrude out of the top surface of the jig plate, a U-shaped groove is respectively formed in the left end and the right end of the jig plate, a threaded rod of a bolt clamped in a table top of the press machine penetrates through the U-shaped groove, and a nut sleeved on the threaded rod is screwed to fix the jig plate on the top of the table top.

4. A bearing and crank pressing apparatus according to claim 3, wherein an insert is provided in the jig plate, and the positioning shaft is fixed in the insert.

5. The bearing and crank pressing device according to claim 3, wherein a guide mechanism located beside the positioning shaft is arranged on the top of the jig plate; the guide mechanism comprises a first plate, a second plate, a third plate and a fourth plate which are sequentially arranged and parallel to each other, the first plate is positioned between the positioning shaft and the second plate, the first plate and the third plate are fixedly connected with the jig plate, a transverse connecting rod penetrating through the third plate connects the second plate with the fourth plate, and a spring is sleeved on the connecting rod positioned between the second plate and the third plate; a sleeve is arranged in the first plate in a penetrating way, one end of the sleeve is connected with the second plate, and the other end of the sleeve is provided with a through hole; and a spring steel ball is arranged in the sleeve, and part of the steel ball is exposed from the through hole under the condition of no compression.

6. The bearing and crank pressing apparatus according to claim 5, wherein a handle is provided in the fourth plate member.