CN218152352U - Sealing structure for electric hammer - Google Patents

Abstract

The utility model provides a seal structure for electric hammer, includes head shell and commentaries on classics cover, and the rigid coupling has the inserts in the head shell, and the material formation is once only got rid of to the inserts ladder perforating hole of multistage diameter from big to little step, changes the cover and is located the ladder perforating hole, is equipped with rolling member and sealing washer between inserts and the commentaries on classics cover, and rolling member and sealing washer are located adjacent step in the ladder perforating hole respectively, and the step diameter at sealing washer place is greater than the step diameter at rolling member place. The outer peripheral surface of the insert and the stepped through hole are completed at one time, so that the adverse effect on the sealing performance of the sealing ring due to the coaxiality difference is eliminated; the rolling needle replaces a ball bearing, so that the damage of the distance sleeve to the sealing performance of the sealing ring is eliminated; meanwhile, the rolling part is used for centering between the insert and the rotating sleeve, and the factor that the sealing performance of the sealing ring is reduced due to unstable inner and outer intervals is eliminated. Based on the three factors which influence the sealing performance of the sealing ring are eliminated, so that the oil leakage problem of the electric hammer is fundamentally solved.

Description

Sealing structure for electric hammer

Technical Field

The utility model relates to an electric tool, more specifically say, the utility model relates to a seal structure for electric hammer.

Background

At present, a common electric hammer is a multifunctional electric hammer which can be switched among a drill gear, a hammer drill gear and a switching gear, a plurality of parts in the electric hammer rotate or move relatively, such as a rotating sleeve, a piston, a swing rod bearing, a hammer rod, a gear shaft and the like, lubricating grease is needed to lubricate among the parts in the electric hammer, and therefore, a sealing structure is needed to seal a channel between the electric hammer and the outside to prevent the lubricating grease from leaking.

At present, electric hammer produced by electric tool production enterprises including large-scale international companies with great strength in foreign technology is generally sealed by directly arranging a sealing ring between a head shell and a rotating sleeve, and because the rotating sleeve and a rotating part sleeved in the rotating sleeve move relatively in the using process of the electric hammer, a large amount of heat is generated by friction of the rotating sleeve and the rotating part, the temperature of the head shell is increased, when the temperature of the head shell is increased to a certain degree, the head shell made of plastic can be slowly softened to generate plastic deformation, so that the sealing ring and the head shell lose the sealing function and leak oil, therefore, after the existing electric hammer is continuously used for a period of time, the use is suspended before the head shell is softened and deformed so as to facilitate the heat dissipation of the head shell, the electric hammer is used when the temperature of the head shell is returned to a normal temperature, and the intermittent use of the electric hammer can influence the operating efficiency and the operating progress; and because the gap exists between the rotating parts sleeved in the rotating sleeve, in addition, the coaxiality is difficult to ensure, the unexpected radial vibration can be inevitably generated in the electric hammer transmission part, the sealing performance of the sealing ring is influenced, the service life is long, the oil leakage phenomenon is inevitable, the sealing ring needs to be frequently replaced, the time and the labor are wasted, and the use cost of the electric hammer is increased.

In view of the above drawbacks, the present applicant has filed an invention patent application entitled "electric hammer" to the national patent office in 2011, 10, 8, and the application has obtained an issue of authority on 2015, 8, 5 days, and has a publication number CN102501223B. The patent discloses a technical scheme as follows: an electric hammer comprises a head shell and a rotary sleeve, wherein a through hole is formed in the head shell, the rotary sleeve is positioned in the through hole, a ball bearing and a sealing ring are respectively arranged between the head shell and the rotary sleeve, the sealing ring is positioned on one side of the ball bearing, the rotary sleeve can rotate relative to the head shell, an outer ring of the ball bearing extends towards one side of the sealing ring and forms a support ring, the width of the support ring is larger than that of an inner ring of the ball bearing, the outer peripheral surface of the sealing ring is abutted against the inner peripheral surface of the support ring, the inner peripheral surface of the sealing ring is abutted against the outer peripheral surface of the rotary sleeve, the support ring is fixedly connected with the inner wall of the through hole of the head shell, the support ring is integrally injection-molded with the inner wall of the through hole of the head shell in the process of injection molding of the head shell, and the diameter of the outer peripheral surface of one end, on the same side with the sealing ring, of the support ring and the sealing ring is smaller than that of the outer peripheral surface of the other end, on the same side with the ball bearing, so as the support ring, and an outer step is formed; the diameter of the inner peripheral surface of one end of the support ring on the same side as the seal ring is smaller than that of the inner peripheral surface of the other end of the support ring on the same side as the ball bearing so as to form an inner step. The technical scheme makes great progress in solving the problem of oil leakage of the electric hammer, but because the inner peripheral surfaces of the bearing and the support ring extending out of the outer ring of the bearing for mounting the seal ring in the technical scheme are not processed at one time, the coaxiality of the bearing and the support ring is difficult to ensure to be consistent, the sealing performance cannot reach an ideal state; and the distance sleeve in the technical scheme continuously impacts the inner ring of the ball bearing in the process of the movement of the rotating sleeve, so that the ball bearing is easily separated from the frame after a long time, the inner and outer distances of the sealing ring are unstable, and the sealing performance of the sealing ring is invalid.

Disclosure of Invention

In order to overcome the above-mentioned defects, the utility model discloses the technical problem that needs to solve is: the sealing structure for the electric hammer is provided, the factor of oil leakage between the rotary sleeve and the head shell in the prior art is eliminated, and the problem of oil leakage is fundamentally solved.

The utility model provides a technical scheme that prior art has the problem is: the utility model provides a seal structure for electric hammer, it includes hollow head shell and commentaries on classics cover, it is located to change the cover in the head shell, fixedly connected with inserts on the head shell inside wall, inserts axial direction is once only got rid of the ladder perforating hole that the material formed multistage diameter from big to little step from one end to the other end, it is located to change the cover in the ladder perforating hole, the inserts with it is equipped with rolling member and sealing washer respectively to change between the cover, rolling member and sealing washer are located respectively on the adjacent step in the ladder perforating hole, the step diameter at sealing washer place is greater than the step diameter at rolling member place. The insert is characterized in that materials are removed from the axial center of the insert from one end to the other end at one time to form a multi-stage stepped through hole with a large diameter to a small diameter, and the processing technological process of the insert comprises the following steps: firstly, the outer circle surface of the insert is machined, and then the outer circle surface of the insert is used as a positioning reference, and the multistage steps of the stepped through hole are machined at one time, so that the coaxiality of the outer circle surface of the insert and the multistage steps of the stepped through hole can be effectively ensured, and the adverse effect on the sealing performance of the sealing ring due to the coaxiality difference is eliminated; the rolling parts and the sealing rings are respectively arranged between the insert and the rotating sleeve and are positioned on the adjacent steps in the stepped through hole, so that the rolling parts are used for replacing the ball bearing, the inner ring of the bearing is omitted, and the damage of the distance sleeve to the sealing performance of the sealing ring is eliminated; meanwhile, the rolling piece made of metal materials is used for centering between the insert and the rotating sleeve, so that the inner and outer space of the installation sealing ring is stable, the sealing performance of the sealing ring can be effectively kept for a long time, and the factor that the sealing performance of the sealing ring is reduced due to the unstable inner and outer space of the installation environment is eliminated. Based on the above, three major factors influencing the sealing performance of the sealing ring are eliminated, so that the oil leakage problem of the electric hammer is fundamentally solved.

Preferably, the number of steps of the stepped through hole is four, and the rolling member and the seal ring are located on the two steps in the middle of the stepped through hole. The number of steps of the stepped through hole is set to four, the rolling piece and the sealing ring are placed on two steps in the middle, the length of the insert is increased, the fixed connection area between the insert and the head shell can be effectively increased, large fixing force is obtained, the stability of the installation environment of the sealing ring can be effectively improved, the rolling piece and the sealing ring can work without being influenced by other parts, and the sealing performance of the sealing ring is stable.

Preferably, the insert outer peripheral surface is provided with a stopper capable of restricting axial movement of the insert with respect to the head housing, and the head housing inner peripheral surface is fitted to the insert outer peripheral surface. This may increase the axial securing force between the insert and the head shell.

Preferably, the stopper body is an annular groove. The stopping body can be convex body, also can be the pit, also can be the sand grip, also can be bar groove, considers that the skull is the working of plastics, and the inlay is the metalwork, the utility model discloses a stopping body adopts annular groove.

Preferably, the rolling elements are needle rollers. The rolling member can be the ball, also can be the gyro wheel, also can be the kingpin, considers that the ball is the point contact, and the gyro wheel is the line contact with the kingpin, and nevertheless the contact wire of kingpin is greater than the contact wire of gyro wheel, consequently, the utility model discloses a rolling member adopts the kingpin, can effectively improve kingpin, inserts like this, changes the atress situation between the cover.

Preferably, the stepped through hole is provided with a groove at a position where the step having a diameter larger than that of the seal ring is close to the seal ring. The check ring for the inlet hole can be clamped in the groove to limit the sealing ring, so that the accuracy of the mounting position of the sealing ring is ensured, and the stability of the sealing performance of the sealing ring is facilitated.

Preferably, the insert is integrally injection-molded with the head housing during injection-molding of the head housing. The insert and the head shell are integrally molded, so that the coaxiality of the insert and the head shell is facilitated, and meanwhile, the fastness of fixed connection between the insert and the head shell is also facilitated.

The utility model has the advantages that: the outer peripheral surface of the insert and the stepped through hole of the four-level step are completed at one time and are integrated with the head shell in an injection molding mode, so that the coaxiality of the insert structure is ensured, and the adverse effect on the sealing performance of the sealing ring due to the coaxiality difference is eliminated; the rolling needle replaces a ball bearing, so that a bearing inner ring is omitted, and the damage of a distance sleeve to the sealing performance of the sealing ring is eliminated; meanwhile, the rolling part is used for centering between the insert and the rotating sleeve, so that the stability of the inner and outer space of the installation sealing ring is ensured, and the factor that the sealing performance of the sealing ring is reduced due to the instability of the inner and outer space is eliminated. Based on the above, three major factors influencing the sealing performance of the sealing ring are eliminated, so that the oil leakage problem of the electric hammer is fundamentally solved.

Drawings

Fig. 1 is a schematic structural sectional view of an electric hammer of the present invention;

fig. 2 is an enlarged schematic view of the R portion in fig. 1.

In the figure: the head shell comprises a head shell 1, a rotating sleeve 2, an insert 3, a roller pin 4, a sealing ring 5, a hole check ring 6, a groove 7, a step through hole 8 and an annular groove 9.

Detailed Description

The technical scheme of the present invention is further specifically described by the following specific embodiments in combination with the drawings of the specification:

example (b): a sealing structure for an electric hammer is disclosed, as shown in figure 1, and comprises a hollow head shell 1 and a rotary sleeve 2, as shown in figure 2, the rotary sleeve 2 is positioned in the head shell 1, the rotary sleeve 2 can rotate relative to the head shell 1, an insert 3 is embedded on the inner side wall of the head shell 1 through injection molding, before the insert 3 is injected, the outer circle surface of the insert 3 is firstly processed, three annular grooves capable of limiting the insert 3 to move axially relative to the head shell 1 are processed at equal intervals in the middle of the outer circle surface of the insert 3, four stages of steps with diameters sequentially arranged from large to small are processed from one end to the other end of the insert 3 from the axial center by taking the outer circle surface of the insert 3 as a positioning reference, so that a stepped through hole 8 is formed, the rotary sleeve 2 is positioned in the stepped through hole 8, matched needle rollers 4 and sealing rings 5 are respectively positioned on two adjacent stages in the middle of the stepped through hole 8, the diameter of the needle roller 4 is larger than that the needle roller 4 is positioned in, the stepped through hole 8 is positioned on a needle roller 7, and a retainer ring 7 is positioned in the stepped through hole 7.

The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.

Details not described in the present specification belong to the prior art known to those skilled in the art.

Claims (6)

1. The utility model provides a seal structure for electric hammer, it includes hollow head shell and commentaries on classics cover, it is located to change the cover in the head shell, a serial communication port, fixedly connected with inserts on the head shell inside wall, inserts axial direction is once only got rid of the ladder perforating hole that the material formed multistage diameter from big to little step from one end to the other end, it is located to change the cover in the ladder perforating hole, the inserts with it is equipped with rolling member and sealing washer respectively to change between the cover, rolling member and sealing washer are located respectively on the downthehole adjacent step of ladder perforating hole, the step diameter at sealing washer place is greater than the step diameter at rolling member place.

2. A sealing structure for an electric hammer according to claim 1, wherein the number of steps of the stepped through-hole is four, and the rolling member and the seal ring are located on the intermediate two steps of the stepped through-hole.

3. A sealing structure for an electric hammer according to claim 1, wherein the insert outer peripheral surface is provided with a stopper that can restrict axial movement of the insert with respect to the head housing, and the head housing inner peripheral surface is fitted to the insert outer peripheral surface.

4. A sealing structure for an electric hammer according to claim 3, wherein the stopper body is an annular groove.

5. A sealing structure for an electric hammer according to any one of claims 1 to 4, wherein the rolling member is a needle roller.

6. A sealing structure for an electric hammer according to claim 2, wherein the stepped through-hole is provided with a groove at a position where a step having a diameter larger than that of the seal ring is proximate to the seal ring.

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