A circulating lubrication structure on a hammer drill

Abstract

The present invention discloses a circulating lubrication structure on a hammer drill, which includes a housing, a bracket, a hammer rod assembly, a piston assembly, a transmission shaft, a drill sleeve, a bearing, and a drill sleeve gasket; an inner front oil cavity and an outer front oil cavity are formed inside and outside the drill sleeve, and a middle oil cavity is formed between the transmission shaft and each component; a number of drill sleeve gasket oil through grooves are evenly arranged on the outer circumference of the drill sleeve gasket in a circumferential manner, drill sleeve oil through holes are provided at positions corresponding to the two-side bearings and the end part of the piston assembly, an assembly flow gap is provided between the piston assembly and the drill sleeve, and the inner front oil cavity, the outer front oil cavity, and the middle oil cavity form a communicating oil passage S1. In the present invention, the drill sleeve gasket oil through grooves, the drill sleeve oil through holes, and the assembly flow gap cooperate to convert the impact force of the reciprocating movement of the piston assembly into the circulation of the lubricating grease filled in the front and middle parts along the oil passage S1; it can enable the lubricating grease to lubricate between each moving part, ensure the lubrication effect, reduce energy consumption, improve the heat dissipation effect, and extend the service life.

Description

Technical Field

[0001] The invention relates to the technical field of hammer drills, and in particular to a circulating lubrication structure on a hammer drill. Background Art

[0002] Hammer drill is an impact tool we often use. There are impact piston mechanism and rotary drill sleeve mechanism in the hammer drill. The impact piston mechanism is arranged in the rotary drill sleeve mechanism. The two mechanisms are output by an output shaft which is arranged at the rear of the shell and connected to the driving motor. The crankshaft eccentric pin assembly on the output shaft drives the impact piston mechanism to do reciprocating motion, and the rotary gear drives the rotary drill sleeve mechanism to do rotational motion. Therefore, during assembly, lubricating grease will be coated and filled between the shell and each mechanism component. During the use of the hammer drill, the lubricating grease coated on the movable parts of the mechanism is easy to cause thrust loss due to the rotation and reciprocating motion impact of the mechanism components, thereby reducing the heat dissipation effect of the mechanism components during use, increasing energy consumption, and reducing the service life. Summary of the invention

[0003] The purpose of the present invention is to solve the problems raised in the above background technology and to provide a circulating lubrication structure on a hammer drill.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows: a circulating lubrication structure on a hammer drill comprises a housing, a bracket, a hammer rod assembly, a piston assembly, a transmission shaft and a drill sleeve. The drill sleeve is positioned and installed by a bearing and a bracket. A drill sleeve gasket is provided between the bearing and the rotating sleeve gear assembly on the drill sleeve. The transmission shaft is respectively connected to the drill sleeve and the hammer rod assembly through the rotating sleeve gear assembly and the rocker bearing shaft. An inner front oil chamber and an outer front oil chamber are respectively formed between the inner and outer sides of the drill sleeve and the front end of the piston assembly and the bearing. A middle oil chamber is formed between the transmission shaft and the housing, the drill sleeve and the bracket. The outer circumference of the drill sleeve gasket is A number of drill sleeve gasket oil grooves are evenly arranged on the circumference, and the drill sleeve gasket oil grooves connect the outer front oil chamber and the middle oil chamber; drill sleeve oil holes are arranged at positions corresponding to the drill sleeve and the bearings on both sides and the ends of the piston assembly, and the drill sleeve oil holes connect the outer front oil chamber and the inner front oil chamber; an assembly circulation gap is provided between the piston assembly and the drill sleeve, and the assembly circulation gap connects the middle oil chamber and the inner front oil chamber; the inner front oil chamber, the outer front oil chamber and the middle oil chamber form a interconnected oil passage S1, and the reciprocating motion of the piston assembly provides power for the internal lubricating grease of the inner front oil chamber, the outer front oil chamber and the middle oil chamber to circulate along the oil passage S1.

[0005] In the above-mentioned circulating lubrication structure on a hammer drill, the transmission shaft forms a connection with the helical gear assembly in the bracket and forms a rear oil cavity. The bracket is provided with a bracket oil passage hole, and a plurality of transmission shaft oil passage grooves are evenly arranged in a circumferential direction on the transmission shaft. The transmission shaft oil passage grooves communicate the middle oil cavity with the rear oil cavity, and the bracket oil passage hole communicates the rear oil cavity with the middle oil cavity; the inner front oil cavity, the outer front oil cavity, the middle oil cavity, and the rear oil cavity form a communicating oil passage path S2, and the rotation of the transmission shaft provides the power for the lubricating grease inside the inner front oil cavity, the outer front oil cavity, the middle oil cavity, and the rear oil cavity to circulate along the oil passage path S2 through the transmission shaft oil passage grooves on it.

[0006] In the above-mentioned circulating lubrication structure on a hammer drill, the bearing is a needle roller bearing, and a plurality of bearing oil passage grooves are evenly arranged in a circumferential direction at the end of the bearing sleeve that correspondingly abuts against the drill sleeve gasket. The bearing oil passage grooves correspond to the drill sleeve oil passage holes.

[0007] In the above-mentioned circulating lubrication structure on a hammer drill, the end of the bearing sleeve correspondingly abuts against the drill sleeve gasket at the drill sleeve gasket oil passage groove, and the thickness of the bearing sleeve is less than the depth of the drill sleeve gasket oil passage groove.

[0008] In the above-mentioned circulating lubrication structure on a hammer drill, a plurality of auxiliary bracket oil passage holes are provided at the upper side position of the bracket, and the auxiliary bracket oil passage holes communicate the inside of the bracket with the middle oil cavity.

[0009] In the above-mentioned circulating lubrication structure on a hammer drill, a bushing is provided between the ends of the drill sleeve connected to the bracket, and an oil passage gap is formed.

[0010] In the above-mentioned circulating lubrication structure on a hammer drill, the drill sleeve gasket abuts against the positioning gasket in the rotating sleeve gear assembly. The positioning gasket is designed in a polygonal shape and forms an oil passage space with the housing.

[0011] In the above-mentioned circulating lubrication structure on a hammer drill, the transmission shaft oil passage grooves on the transmission shaft are arranged in a spiral shape.

[0012] In the above-mentioned circulating lubrication structure on a hammer drill, the transmission shaft oil passage grooves on the transmission shaft are arranged in a straight groove shape.

[0013] In the above-mentioned circulating lubrication structure on a hammer drill, the transmission shaft rotates counterclockwise for transmission in the bracket, and the bracket oil passage hole is provided at the rear side in the counterclockwise direction on the bracket.

[0014] The beneficial effects of the present invention are:

[0015] In the present invention, the oil passage groove of the drill bushing gasket and the oil passage hole of the drill bushing cooperate with the distribution clearance, so that a communicating oil passage S1 is formed in the front and middle parts between the housing and its internal components. The impact force generated by the reciprocating movement of the piston assembly is converted to provide the lubricating grease filled in the front and middle parts to circulate along the oil passage S1. Thus, the lubricating grease can lubricate between the moving parts, ensure sufficient lubrication, reduce energy consumption, improve the heat dissipation effect, and extend the service life.

[0016] In the present invention, the oil passage hole of the bracket cooperates with the oil passage groove of the transmission shaft, so that a communicating oil passage S2 is formed in the front, middle and rear parts between the housing and its internal components. As the transmission shaft rotates, the lubricating grease filled in the front, middle and rear parts circulates along the oil passage S2. Thus, with the cooperation of the oil passages S1 and S2, the lubricating grease further lubricates between the moving parts, ensures sufficient lubrication, reduces energy consumption, improves the heat dissipation effect, and extends the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a sectional structure diagram of the present invention;

[0018] Figure 2 is a three-dimensional view of the drill bushing gasket in the present invention;

[0019] Figure 3 、 4 is a three-dimensional view of the transmission shaft in the present invention;

[0020] Figure 5 is a three-dimensional view of the bearing in the present invention;

[0021] Figure 6 is a three-dimensional view of the bracket in the present invention;

[0022] Figure 7 is a three-dimensional view of the positioning gasket in the present invention;

[0023] Figure 8 is a sectional view after the cooperation between the drill bushing gasket and the bearing in the present invention;

[0024] Figure 9 is a three-dimensional view of the drill bushing in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; in the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0026] The following further elaborates on the present invention with reference to the accompanying drawings.

[0027] Please refer to Figures 1 to 9 , the present invention provides a circulating lubrication structure on a hammer drill, including a housing 1, a bracket 2, a hammer rod assembly 3, a piston assembly 4, a transmission shaft 5, and a drill sleeve 6. The bracket 2 is fixedly connected to the housing 1. The piston assembly 4 and the hammer rod assembly 3 are installed in the drill sleeve 6. The drill sleeve 6 is positioned and installed through bearings 7 and the bracket 2. A drill sleeve gasket 9 is provided between the bearing 7 and the rotating sleeve gear assembly 8 on the drill sleeve 6. Both ends of the transmission shaft 5 are respectively connected to the housing 1 and the bracket 2, and at the same time, are respectively in transmission connection with the drill sleeve 6 and the hammer rod assembly 3 through the rotating sleeve gear assembly 8 and the swing rod bearing shaft 10; Figure 1 As can be seen, an oil seal 6-1 is provided between the front end of the drill sleeve 6 and the housing 1. The rear end of the bracket 2 is hermetically connected to the housing 1. Multiple sealing structures are provided between the component connections of the piston assembly 4 and the hammer rod assembly 3 to prevent the lubricating grease coated and filled in the housing 1 and the internal components from leaking out. The components in the housing 1 and the connection and sealing are prior art and will not be elaborated in detail here.

[0028] An inner front oil cavity 11 and an outer front oil cavity 12 are respectively formed between the inner and outer sides of the drill bushing 6 and the front end of the piston assembly 4 and the bearing 7. A middle oil cavity 13 is formed between the transmission shaft 5 and the housing 1, the drill bushing 6, and the bracket 2. A number of oil grooves 14 for the drill bushing gasket are evenly arranged on the outer circumference of the drill bushing gasket 9, and the oil grooves 14 for the drill bushing gasket communicate the outer front oil cavity 12 with the middle oil cavity 13. Oil holes 15 are provided at positions of the drill bushing 6 corresponding to the two side bearings 7 and the ends of the piston assembly 4, and the oil holes 15 communicate the outer front oil cavity 12 with the inner front oil cavity 11. An assembly flow gap 16 is provided between the piston assembly 4 and the drill bushing 6, and the assembly flow gap 16 communicates the middle oil cavity 13 with the inner front oil cavity 11. The transmission shaft 5 is connected to the helical gear assembly 17 in the bracket 2 to form a rear oil cavity 18. The helical gear assembly 17 is drivingly connected to the motor shaft 29. An oil hole 19 is provided on the bracket 2. A number of oil grooves 20 are evenly arranged on the circumference of the transmission shaft 5, and the oil grooves 20 communicate the middle oil cavity 13 with the rear oil cavity 18. The oil hole 19 in the bracket communicates the rear oil cavity 18 with the middle oil cavity 13.

[0029] The inner front oil cavity 11, the outer front oil cavity 12, and the middle oil cavity 13 form a communicating oil path S1. The reciprocating movement of the piston assembly 4 provides the power for the lubricating grease inside the inner front oil cavity 11, the outer front oil cavity 12, and the middle oil cavity 13 to circulate along the oil path S1. The inner front oil cavity 11, the outer front oil cavity 12, the middle oil cavity 13, and the rear oil cavity 18 form a communicating oil path S2. The rotation of the transmission shaft 5 provides the power for the lubricating grease inside the inner front oil cavity 11, the outer front oil cavity 12, the middle oil cavity 13, and the rear oil cavity 18 to circulate along the oil path S2 through the oil grooves 20 on it. During the use of the hammer drill, the impact force generated by the reciprocating movement of the piston assembly 4 and the rotational flow force formed by the rotation of the transmission shaft 5 through the oil grooves 20 on it will cause the lubricating grease coated and filled between the inside of the housing and each component to circulate along the oil paths S1 and S2, so as to lubricate through each component, fully ensure the lubrication effect, reduce energy consumption, improve the heat dissipation effect, and extend the service life.

[0030] Furthermore, in order to better ensure the circulation of the lubricating grease, the bearing 7 is a needle bearing. A number of bearing oil grooves 22 are evenly arranged on the circumference of the end of the bearing sleeve 21 corresponding to and abutted against the drill bushing gasket 9, and the bearing oil grooves 22 correspond to the oil holes 15 in the drill bushing. The end of the bearing sleeve 21 is correspondingly abutted against the oil grooves 14 in the drill bushing gasket 9 on the drill bushing gasket 9, and the thickness of the bearing sleeve 21 is less than the depth of the oil grooves 14 in the drill bushing gasket.

[0031] Further, a plurality of auxiliary support oil through holes 23 are provided at the upper side position of the support 2. The auxiliary support oil through holes 23 communicate the inside of the support 2 with the middle oil cavity 13, so that the lubricating grease can flow and lubricate between the support 2 and the middle oil cavity 13.

[0032] Further, a bushing 24 is provided between the end of the drill bushing 6 connected to the support 2, and an oil through gap 25 is formed. The drill bushing gasket 9 abuts against the positioning gasket 26 in the rotating sleeve gear assembly 8. The positioning gasket 26 is designed in a polygonal shape and forms an oil through space with the housing 1, so that the lubricating grease can lubricate the contact points between the drill bushing 6 and various components.

[0033] Further, the oil through groove 20 on the transmission shaft 5 is arranged in a spiral shape or a straight groove shape, preferably in a spiral design, so as to ensure the rotational flow force generated by the rotation of the transmission shaft on the lubricating grease.

[0034] Further, as Figure 6 shown, the transmission shaft 5 rotates counterclockwise for transmission in the support 2, and the support oil through hole 19 is provided at the rear side in the counterclockwise direction of the support 2, so that with the rotation of the transmission shaft 5, the lubricating grease can flow better from the support oil through hole 19.

[0035] The above has introduced in detail a circulating lubrication structure on a hammer drill provided by an embodiment of the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention. At the same time, for general technical users in the field, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A circulating lubrication structure on a hammer drill, comprising a housing (1), a bracket (2), a hammer rod assembly (3), a piston assembly (4), a transmission shaft (5), and a drill sleeve (6). The drill sleeve (6) is positioned and installed through a bearing (7) and the bracket (2). A drill sleeve gasket (9) is provided between the bearing (7) and a rotating sleeve gear assembly (8) on the drill sleeve (6). The transmission shaft (5) is respectively in transmission connection with the drill sleeve (6) and the hammer rod assembly (3) through the rotating sleeve gear assembly (8) and a swing rod bearing shaft (10); It is characterized in that: Inner and outer sides of the drill sleeve (6) respectively form an inner front oil cavity (11) and an outer front oil cavity (12) with the front end of the piston assembly (4) and the bearing (7). A middle oil cavity (13) is formed between the transmission shaft (5), the housing (1), the drill sleeve (6), and the bracket (2). A number of drill sleeve gasket oil through grooves (14) are evenly arranged on the outer circumference of the drill sleeve gasket (9). The drill sleeve gasket oil through grooves (14) communicate the outer front oil cavity (12) with the middle oil cavity (13). Drill sleeve oil through holes (15) are provided at positions of the drill sleeve (6) corresponding to the two side bearings (7) and the ends of the piston assembly (4). The drill sleeve oil through holes (15) communicate the outer front oil cavity (12) with the inner front oil cavity (11). An assembly flow gap (16) is provided between the piston assembly (4) and the drill sleeve (6). The assembly flow gap (16) communicates the middle oil cavity (13) with the inner front oil cavity (11). The inner front oil cavity (11), the outer front oil cavity (12), and the middle oil cavity (13) form a communicating oil passage S1. The reciprocating movement of the piston assembly (4) provides power for the lubricating grease inside the inner front oil cavity (11), the outer front oil cavity (12), and the middle oil cavity (13) to circulate along the oil passage S1; The transmission shaft (5) forms a connection with a helical gear assembly (17) inside the bracket (2) and forms a rear oil cavity (18). A bracket oil through hole (19) is provided on the bracket (2). A number of transmission shaft oil through grooves (20) are evenly arranged on the circumference of the transmission shaft (5). The transmission shaft oil through grooves (20) communicate the middle oil cavity (13) with the rear oil cavity (18). The bracket oil through hole (19) communicates the rear oil cavity (18) with the middle oil cavity (13). The inner front oil cavity (11), the outer front oil cavity (12), the middle oil cavity (13), and the rear oil cavity (18) form a communicating oil passage S2. The rotation of the transmission shaft (5) provides power for the lubricating grease inside the inner front oil cavity (11), the outer front oil cavity (12), the middle oil cavity (13), and the rear oil cavity (18) to circulate along the oil passage S2 through the transmission shaft oil through grooves (20) on it; The bearing (7) is a needle bearing. A number of bearing oil through grooves (22) are evenly arranged on the circumference of the end of its bearing sleeve (21) corresponding to and abutted against the drill sleeve gasket (9). The bearing oil through grooves (22) correspond to the drill sleeve oil through holes (15).

2. A circulating lubrication structure on a hammer drill according to claim 1, It is characterized in that: The end of the bearing sleeve (21) correspondingly abuts against the oil through groove (14) of the drill bushing gasket (9), and the thickness of the bearing sleeve (21) is less than the depth of the oil through groove (14) of the drill bushing gasket (9).

3. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: A plurality of auxiliary support oil through holes (23) are provided at the upper side position of the support (2), and the auxiliary support oil through holes (23) communicate the inside of the support (2) with the middle oil cavity (13).

4. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: A bushing (24) is provided between the end of the drill bushing (6) connected to the support (2), and an oil through gap (25) is formed.

5. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: The drill bushing gasket (9) abuts against the positioning gasket (26) in the swivel gear assembly (8). The positioning gasket (26) is designed in a polygonal shape and forms an oil through space with the housing (1).

6. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: The oil through groove (20) on the transmission shaft (5) is arranged in a spiral shape.

7. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: The oil through groove (20) on the transmission shaft (5) is arranged in a straight groove shape.

8. A circulating lubrication structure on a hammer drill according to claim 1, characterized in that: The transmission shaft (5) rotates counterclockwise for transmission in the support (2), and the support oil through hole (19) is provided at the rear side in the counterclockwise direction of the support (2).

Images