CN216883809U - Safety clutch and electric hammer with same - Google Patents

Abstract

The application relates to a safety clutch with long service life and an electric hammer with the same. The utility model provides a safety clutch, safety clutch includes the gear shaft, the cover is equipped with gear wheel, locking plate, second gasket, elastic component and third gasket in proper order on the gear shaft, the gear wheel is close to first accommodation chamber has been seted up to one side of locking plate, a plurality of second accommodation chamber have been seted up to the bottom surface of first accommodation chamber, a plurality of steel column accommodation holes have been seted up to the locking plate, be provided with steel column (17) in the steel column accommodation hole, steel column (17) are including relative first tip (171) and the second tip (172) that sets up, first tip (171) are supported and are leaned on at second gasket (19), second tip (172) support and lean on bottom surface (162b) that the second accommodated the chamber, wherein, bottom surface (162b) that the second accommodated the chamber are the plane. According to the safety clutch and the electric hammer with the same, the vibration can be reduced, and the service life is effectively prolonged.

Description

Safety clutch and electric hammer with same

Technical Field

The application relates to the technical field of electric hammers, in particular to a safety clutch capable of prolonging service life and an electric hammer with the safety clutch.

Background

Along with the development of electric hammer technique, the safety clutch technique has appeared, and the safety clutch technique can ensure operator's safety, avoids when the operation machine, and the card of drill bit leads to powerful reaction torque to transmit to the operator, causes operator's bodily injury.

In the traditional technology, a safety clutch of an electric hammer comprises a gear shaft, wherein a large gear, a locking piece, a steel column, a large gasket, a disc spring and a nut are sequentially sleeved on the gear shaft, the gear shaft and the locking piece integrally rotate, when the nut is installed, the disc spring is stressed and deformed by the locking nut, the disc spring transmits the deformation force to the large gasket to tightly press the steel column, and the steel column is tightly close to the large gear; when the drill bit is stressed and clamped, the gear shaft and the gear wheel cannot be driven to do circular motion together, and when the safety clutch is overloaded, the steel column is tightly attached to the bottom surface of the gear wheel and does reciprocating motion along the bottom surface of the gear wheel in the axial direction of the gear shaft.

However, in the existing safety clutch, after the tripping frequency is increased, the disc spring is easy to crack and damage, and the edge of the steel column accommodating groove in the large gear is subjected to long-time overload clutch, so that the steel column and the edge are abraded, the tripping torque is reduced, the performance of the machine is influenced, and the service life of the machine is shortened.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will be solved provides a safe clutch that can increase of service life and has its electric hammer.

In order to solve the problems, the application provides a safety clutch, which comprises a gear shaft, wherein a gear wheel, a locking plate, a second gasket, an elastic part and a third gasket are sequentially sleeved on the gear shaft, a first accommodating chamber is formed in one side, close to the locking plate, of the gear wheel, a plurality of second accommodating chambers are formed in the bottom surface of the first accommodating chamber, a plurality of steel column accommodating holes are formed in the locking plate, steel columns are arranged in the steel column accommodating holes and comprise first end parts and second end parts which are oppositely arranged, the first end parts are abutted against the second gasket, the second end parts are abutted against the bottom surface of the second accommodating chamber, the bottom surface of the second accommodating chamber is a plane, so that when the steel columns are arranged in the second accommodating chamber, the steel columns are abutted against the bottom of the second accommodating chamber for a longer time, and are prevented from frequently entering the second accommodating chamber, the machine generates unnecessary vibration, thereby prolonging the service life of the safety clutch.

As the further improvement of the above-mentioned safety clutch of this application, the oilhole has been seted up to the bottom surface that the second holds the room, makes like this the second hold the chamber with the back intercommunication of gear wheel neither can the second holds the grease in chamber to pile up, can also not make the second holds the chamber and lacks the grease, leads to the second holds the quick wearing and tearing of room to further extension safety clutch's life.

As a further improvement of the above safety clutch of the present application, the elastic member is a compression spring, so that the elastic member is simple and reliable to manufacture, low in price, and long in service life, thereby further prolonging the service life of the safety clutch.

As the above-mentioned safety clutch's of this application further improvement, the bottom surface of first accommodation chamber is the plane, just the bottom surface of first accommodation chamber with the bottom surface of second accommodation chamber is parallel, makes like this safety clutch is when transshipping, the deformation power of elastic component remains unchanged, just the second gasket is the perpendicular to all the time the axis of gear shaft makes the circumference atress balance of elastic component bottom prolongs the life of elastic component, thereby further extension safety clutch's life.

As a further improvement of the above-mentioned safety clutch of this application, the second holds the room for certainly the sunken recess that forms in bottom surface of first holding the room, the opening of recess is fan-shaped roughly, makes like this the steel column when doing circumferential motion around the gear shaft, the steel column with the gear wheel is line contact all the time, reduces the steel column with the wearing and tearing of gear wheel have further prolonged safety clutch's life.

As the above-mentioned safety clutch's of this application further improvement, the second holds the room and includes block portion and income knot portion, block portion is used for blocking the steel column, makes safety clutch normally works, it is used for making the steel column follow to go into knot portion first holds the room and steadily gets into the second holds the room, block portion with it sets up relatively to go into knot portion, block portion with it all sets up to smooth and slick surface to go into knot portion, makes like this the steel column is in the process block portion with when going into knot portion, roll that can be level and smooth, avoid leading to because of the closed angle the steel column with the wearing and tearing of gear wheel, thereby further extension safety clutch's life.

As a further improvement of the above safety clutch of the present application, the bending degree of the engaging portion is greater than the bending degree of the engaging portion, so that the steel column can be engaged with the engaging portion, and the steel column can smoothly roll in the engaging portion, thereby avoiding the failure of the safety clutch due to the excessively small disengaging force of the engaging portion, and further prolonging the service life of the safety clutch.

As a further improvement of the above-mentioned safety clutch of this application, the quantity of steel column accommodation hole with the quantity one-to-one of steel column, just the quantity of steel column accommodation hole with the quantity one-to-one of second accommodation chamber, and each the steel column accommodation hole winds the axis uniform configuration of gear shaft, and each the steel column winds the axis uniform configuration of gear shaft, and each the second accommodation chamber winds the axis uniform configuration of gear shaft makes like this safety clutch can the steady transmission.

As the further improvement of the above-mentioned safety clutch of this application, the hole shape of steel column accommodation hole is the fillet rectangle, makes like this the steel column can set up in the steel column accommodation hole, and the fillet design makes the locking plate not fragile, thereby further extension safety clutch's life.

The application also provides an electric hammer, which comprises the safety clutch.

Drawings

FIG. 1 is an exploded schematic view of the security clutch of the present application;

FIG. 2 is a cross-sectional view of the security clutch of the present application;

FIG. 3 is an enlarged view of a portion of the portion A of FIG. 2;

FIG. 4 is a schematic view of the bull gear of FIG. 1;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is an enlarged partial schematic view of the location C of FIG. 5;

FIG. 7 is a schematic view of the locking tab of FIG. 1;

fig. 8 is a schematic structural view of part of an electric hammer having the safety clutch of the present application.

The respective symbols and descriptions in the drawings are as follows.

10-a safety clutch; 11-gear shaft; 12-framework oil seal; 13-distance circle; 14-a first bearing; x-axis of gear shaft; 15-a first gasket; 16-gearwheel; 17-steel column; 18-locking tab; 19-a second gasket; 20-an elastic member; 21-a third gasket; 22-a clamp spring; 23-a second bearing; 181-steel column accommodating holes; 161-a first containment chamber; 161 a-a bottom surface of the first receiving chamber; 162-a second containment chamber; 163-oil passing holes; 162 a-engaging portion; 162 b-the bottom surface of the second receiving chamber; 162 c-a snap-in portion; 171-a first end portion; 172-second end.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention 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 invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.

FIG. 1 illustrates an exploded view of a security clutch of an embodiment of the present application. As shown in fig. 1 and 2, the safety clutch includes a gear shaft 11, and a gearwheel 16, a locking plate 18, a second gasket 19, an elastic member 20, and a third gasket 21 are sequentially sleeved on the gear shaft 11, a first accommodating chamber 161 is formed on one side of the gearwheel 16 close to the locking plate 18, a plurality of second accommodating chambers 162 are formed on a bottom surface 161a of the first accommodating chamber, the locking plate 18 is formed with a plurality of steel column accommodating holes 181, a steel column 17 is disposed in the steel column accommodating hole 181, the steel column 17 includes a first end portion 171 and a second end portion 172 which are oppositely disposed, the first end portion 171 abuts against the second gasket 19, the second end portion 172 abuts against a bottom surface 162b of the second accommodating chamber, wherein the bottom surface 162b of the second accommodating chamber is a plane,

in a specific embodiment, the locking plate 18 is disposed between the large gear 16 and the second gasket 19, the locking plate 18 has a steel column receiving hole 181, the steel column 17 is disposed in the steel column receiving hole 181, and the thickness of the locking plate 18 is smaller than the diameter of the steel column 17, an elastic member 20, a third gasket 21 and a snap spring 22 are sequentially disposed on the second gasket 19 along the axis X of the gear shaft in a direction away from the steel column 17, the snap spring 22 is disposed in a circular groove of the gear shaft 11 to limit the third gasket 21 from moving along the axis X of the gear shaft in a direction away from the steel column 17, the elastic member 20 abuts against the second gasket 19 and the third gasket 21, the elastic member 20 exerts a deformation force on the second gasket 19, so that the first end 171 of the steel column 17 always abuts against the second gasket 19, the second end 172 of the steel column 17 always abuts against the bottom surface 162b of the second accommodating chamber, the distance from the bottom surface 161a of the first accommodating chamber to the second gasket 19 is greater than the thickness of the locking plate 18, so that the locking plate 18 can move freely in the axis X direction of the gear shaft, the increase of the disengaging force caused by friction between the locking plate 18 and the gearwheel 16 and the second gasket 19 is avoided, and the bottom surface 162b of the second accommodating chamber is a plane, so that when the steel column 17 is in the second accommodating chamber 162, the steel column 17 abuts against the bottom of the second accommodating chamber 162 for a long time, and the steel column 17 is prevented from frequently entering the second accommodating chamber 162 to cause unnecessary vibration of the machine, so that the service life of the machine is prolonged.

As a preferred embodiment, as shown in fig. 3, an oil passing hole 163 is opened in a bottom surface 162b of the second accommodating chamber.

Specifically, an oil passing hole 163 is formed in the bottom surface 162b of the second accommodating chamber, the oil passing hole 163 enables the second accommodating chamber to be communicated with the back surface of the large gear 16, so as to form a passage of an oil path, when the safety clutch is overloaded, the steel column 17 is in a circular ring shape in the rolling path of the large gear 16, the oil passing hole 163 is completely covered by the circular ring path, the second accommodating chamber 162 of the large gear 16 has redundant grease, when the steel column 17 passes through the oil passing hole 163, the grease can be pushed into the oil passing hole 163 by the steel column 17 and overflows to the back surface of the large gear 16, so that the problem that the opening force of the second accommodating part is reduced due to the redundant grease is avoided, the machine use performance is affected, when the grease in the second accommodating chamber 162 of the large gear 16 is too little, the grease on the back surface of the large gear 16 enters the second accommodating part from the oil passing hole 163, the second accommodating part is prevented from causing serious abrasion of the steel column 17 and the large gear 16 due to too little grease, and therefore the service life of the safety clutch is further prolonged.

In a preferred embodiment, as shown in fig. 1 and 2, the elastic member 20 is a compression spring.

Particularly, the compression spring has certain cushioning effect, can reduce self vibrations that safety clutch brought when transshipping, and compression spring simple manufacture, reliable, the low price, life is permanent, can prolong safety clutch's life, and is special, compression spring can be the turriform spring, and the turriform spring small, the load is big, can bear bigger pressure, stores more energy.

As a preferred embodiment, as shown in fig. 4 and 5, the bottom surface 161a of the first accommodating chamber is a plane, and the bottom surface 161a of the first accommodating chamber is parallel to the bottom surface 162b of the second accommodating chamber.

Specifically, the bottom surface 161a of the first receiving chamber is a plane, and the plane is perpendicular to the axis X of the gear shaft, the bottom surface 161a of the first receiving chamber is parallel to the bottom surface 162b of the second receiving chamber, i.e., the bottom surface 162b of the second receiving chamber is perpendicular to the axis X of the gear shaft, so that the second gasket 19 can be always perpendicular to the axis X of the gear shaft, when the elastic element 20 applies a deformation force to the second gasket 19, the deformation force of the elastic element 20 can be uniformly distributed around the axis X of the gear shaft in the axial direction, so as to prevent the deformation force of the elastic element 20 from being concentrated in one direction due to the fact that the second gasket 19 is not perpendicular to the axis X of the gear shaft, so that the steel column 17 and the gearwheel 16 are subjected to accelerated wear, thereby further prolonging the service life of the safety clutch.

In a preferred embodiment, as shown in fig. 4, the second receiving chamber 162 is a recess formed by recessing from the bottom surface 161a of the first receiving chamber, and the opening of the recess is substantially fan-shaped.

Specifically, the second receiving chamber 162 is a groove formed by recessing from the bottom surface 161a of the first receiving chamber, and the opening of the groove is substantially fan-shaped, so that when the steel column 17 moves circumferentially around the gear shaft 11, the steel column 17 and the gearwheel 16 are always in line contact, thereby reducing the wear of the steel column 17 and the gearwheel 16, and further prolonging the service life of the safety clutch.

As a preferred embodiment, as shown in fig. 5 and 6, the second accommodating chamber 162 includes an engaging portion 162a and a snap-in portion 162c, the engaging portion 162a is used for catching the steel column 17 to enable the safety clutch to work normally, the snap-in portion 162c is used for enabling the steel column 17 to smoothly enter the second accommodating chamber 162 from the first accommodating chamber 161, the engaging portion 162a and the snap-in portion 162c are arranged oppositely, and both the engaging portion 162a and the snap-in portion 162c are arranged in a smooth curved surface.

Specifically, the engaging portion 162a and the snap-in portion 162c are disposed opposite to each other, when the safety clutch is overloaded, the large gear 16 rotates clockwise with respect to the steel column 17, the engaging portion 162a and the snap-in portion 162c are sequentially disposed in the single second accommodating chamber 162 in the clockwise direction, and when the steel column 17 passes through the engaging portion 162a and the snap-in portion 162c, the steel column 17 can smoothly roll on a smoothly curved surface, so that abrasion of the steel column 17 and the large gear 16 due to a sharp corner is avoided, and the service life of the safety clutch is further prolonged.

As a preferred embodiment, as shown in fig. 6, the engaging portion 162a is bent to a greater extent than the hook portion 162 c.

Specifically, the engaging portion 162a has a curved surface with a large degree of curvature, the steel column 17 is pressed by the second gasket 19 in the axis X direction of the gear shaft, and only when the steel column 17 reaches a predetermined overload force, the steel column 17 reaches the bottom surface 161a of the first accommodating chamber through the engaging portion 162a, so as to avoid that the disengaging force of the engaging portion 162a is too small, which leads to the failure of the safety clutch, thereby further prolonging the service life of the safety clutch; the buckle-in part 162c has a curved surface with a small bending degree, the steel column 17 passes through the buckle-in part 162c from the bottom surface 161a of the first accommodating chamber to the bottom surface 162b of the second accommodating chamber, the steel column 17 can smoothly roll, the problem that the bending degree of the buckle-in part 162c is large and the steel column 17 cannot always abut against the gearwheel 16 is avoided, so that the steel column 17 impacts the bottom surface 162b of the second accommodating chamber, and the service life of the safety clutch is further prolonged.

As a preferred embodiment, as shown in fig. 1, the number of the steel column receiving holes 181 corresponds to the number of the steel columns 17, the number of the steel column receiving holes 181 corresponds to the number of the second receiving chambers 162, the steel column receiving holes 181 are uniformly arranged around the axis X of the gear shaft, the steel columns 17 are uniformly arranged around the axis X of the gear shaft, and the second receiving chambers 162 are uniformly arranged around the axis X of the gear shaft.

Specifically, the safety clutch has a plurality of steel columns 17, steel column accommodating holes 181 and second accommodating chambers 162, and the number of the steel columns 17, the number of the steel column accommodating holes 181 and the number of the second accommodating chambers 162 correspond to one another, so that an overload force applied to a single steel column 17 can be reduced, wear of the steel column 17 and the gearwheel 16 can be reduced, and two or more steel columns 17, two or more steel column accommodating holes 181 and two or more second accommodating chambers 162 are uniformly arranged around the axis X of the gear shaft, so that the safety clutch is stable in performance and more reliable.

In a preferred embodiment, as shown in fig. 7, the hole shape of the steel column receiving hole 181 is a rounded rectangle.

Specifically, the steel column 17 is disposed in the steel column receiving hole 181, and the round design makes the locking piece 18 not easily crack when being impacted, thereby further prolonging the service life of the safety clutch.

The embodiment also provides an electric hammer, as shown in fig. 8, which comprises a safety clutch 10, wherein the safety clutch 10 is the safety clutch described above.

Specifically, as shown in fig. 1 and fig. 2, the safety clutch 10 includes a distance ring 13, a first bearing 14, a first gasket 15 and a second bearing 23 which are sequentially sleeved, the distance ring 13 is used for separating the end portion of the gear shaft 11 from the first bearing 14, the first gasket 15 is arranged between the first bearing 14 and the gearwheel 1, an inner ring of the first gasket 15 abuts against an end surface of the first gasket 15, a gap is formed between an outer ring of the first bearing 14 and the gearwheel 16, and the framework oil seal 12 is sleeved on an outer peripheral surface of the distance ring 13. As shown in fig. 8, the first bearing 14 and the second bearing 23 of the safety clutch 10 are disposed in an electric hammer to support the safety clutch 10, the frame oil seal 12 is disposed on a side of the first bearing 14 away from the bull gear 16 to prevent grease on two sides of the frame oil seal 12 from flowing through, which reduces performance of the safety clutch 10, and the safety clutch 10 is the safety clutch 10 as described above, and further, the safety clutch 10 in this embodiment has advantages, and the electric hammer in this embodiment should also have, which is not described herein again.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A safety clutch comprises a gear shaft (11), wherein a large gear (16), a locking plate (18), a second gasket (19), an elastic piece (20) and a third gasket (21) are sequentially sleeved on the gear shaft (11),

a first accommodating chamber (161) is formed on one side of the bull gear (16) close to the locking piece (18), a plurality of second accommodating chambers (162) are formed on the bottom surface (161a) of the first accommodating chamber,

the locking piece (18) is provided with a plurality of steel column accommodating holes (181), and steel columns (17) are arranged in the steel column accommodating holes (181), and the locking piece is characterized in that,

the steel column (17) comprises a first end portion (171) and a second end portion (172) which are arranged oppositely, the first end portion (171) abuts against the second gasket (19), the second end portion (172) abuts against the bottom surface (162b) of the second accommodating chamber, and the bottom surface (162b) of the second accommodating chamber is a plane.

2. The safety clutch according to claim 1, wherein the bottom surface (162b) of the second receiving chamber is opened with an oil passing hole (163).

3. A safety clutch according to claim 1, characterized in that said elastic member (20) is a compression spring.

4. A security clutch according to claim 1, characterized in that the bottom surface (161a) of the first housing chamber is plane and the bottom surface (161a) of the first housing chamber is parallel to the bottom surface (162b) of the second housing chamber.

5. A security clutch, according to claim 4, characterized in that said second housing chamber (162) is a recess formed by recessing from the bottom surface (161a) of said first housing chamber, the opening of said recess being substantially sector-shaped.

6. The safety clutch according to claim 5, characterized in that the second accommodating chamber (162) comprises a clamping portion (162a) and a snap-in portion (162c), the clamping portion (162a) is used for clamping the steel column (17) to enable the safety clutch to work normally, the snap-in portion (162c) is used for enabling the steel column (17) to enter the second accommodating chamber (162) from the first accommodating chamber (161) smoothly, the clamping portion (162a) and the snap-in portion (162c) are arranged oppositely, and the clamping portion (162a) and the snap-in portion (162c) are both arranged to be a smooth curved surface.

7. The safety clutch according to claim 6, characterized in that the degree of curvature of the engaging portion (162a) is greater than the degree of curvature of the stabbing portion (162 c).

8. The safety clutch according to claim 7, characterized in that the number of the steel column receiving holes (181) corresponds to the number of the steel columns (17) one by one, the number of the steel column receiving holes (181) corresponds to the number of the second receiving chambers (162) one by one, each steel column receiving hole (181) is uniformly arranged around the axis (X) of the gear shaft, each steel column (17) is uniformly arranged around the axis (X) of the gear shaft, and each second receiving chamber (162) is uniformly arranged around the axis (X) of the gear shaft.

9. The security clutch of claim 1, wherein the steel post receiving aperture (181) is in the shape of a rounded rectangle.

10. An electric hammer, characterized in that it comprises a safety clutch (10) according to any one of claims 1 to 9.

Images