CN208179444U - Electric hammer - Google Patents

Abstract

The utility model provides a kind of electric hammer, is related to electric tool technology.Electric hammer provided by the utility model, including the Gearbox (1100) with plastic box (1110) and metalwork (1120), plastic box (1110) has relatively small density, so, the weight of Gearbox (1100) can be substantially reduced, simultaneously, by the way that metalwork (1120) are arranged, metalwork (1120) enabling capabilities with higher, it is able to bear the support strength for guaranteeing Gearbox (1100) compared with big load, to, not only significantly reduce the weight of electric hammer complete machine, it can also ensure that the support strength of electric hammer complete machine.

Description

Electric hammer

Technical field

The utility model relates to electric tool technology more particularly to a kind of electric hammers.

Background technique

Electric hammer is a kind of electrodynamic type rotation hammer drill with Pneumatic hammering mechanism, it is increased on the basis of electric drill One piston apparatus motor-driven with crankshaft-link rod, by cylinder reciprocating air make the air in cylinder Pressure is in cyclically-varying, to drive the top of the hammer reciprocating hammer drill bit in cylinder, i.e., the drill bit of electric hammer is in rotation The fast reciprocating impact along electric drill bar direction is also created simultaneously, and then realizes the aperture on metope, floor, stone material, tool Have the advantages that Labor-saving high-efficiency, aperture are big, drilling depth is long.

Electric hammer generally comprises: main part, work head and handle portion, and the front end of main part is arranged in work head, and handle portion is set It sets in the rear end of main part.Main part includes casing, and casing includes: electric machine casing, reduction box casing and rear cover, and rear cover is main The cavity formed for sealed electric-motor shell and reduction box casing；Motor mechanism is provided in electric machine casing, in reduction box casing It is provided with transmission mechanism, transmission mechanism is connected between motor mechanism and work head, so that motor mechanism is mentioned by transmission mechanism Supply work head is rotatably driven power, and is supplied to impact force of the work head along impact direction by transmission mechanism.

In the prior art, electric hammer especially 3 kilograms or more of vertical electric hammer, main part casing is all made of metal material system At so that complete machine has preferable support strength.However, the density due to metal material is larger, casing made of metal has Biggish weight, this results in the weight of electric hammer complete machine larger, increases the operation difficulty of staff.

Utility model content

In view of the above-mentioned drawbacks in the prior art, the utility model provides a kind of electric hammer, can reduce the weight of electric hammer complete machine Amount, simultaneously, additionally it is possible to guarantee the support strength of complete machine.

The utility model provides a kind of electric hammer, comprising: casing, the front end of the casing is for connecting work head；The machine Motor mechanism is provided in shell, the motor mechanism has motor shaft；Output shaft, the output shaft are additionally provided in the casing It is arranged with the motor shaft in angle, the output shaft is for accommodating work head；Wherein, the casing includes Gearbox, The deceleration box includes plastic box and the metalwork that is arranged on the plastic box.

Optionally, cylinder assembly is provided in the Gearbox, the metalwork is used to support the cylinder assembly. Wherein, the cylinder assembly includes cylinder block, and the cylinder block forms at least partly described output shaft.

Optionally, the metalwork includes: support tube, and support tube setting is in the plastic box towards the work The front end of head, the support tube are used to support preceding end bearing；Wherein, before the front end bearing is set in the cylinder assembly End.

Optionally, the front end of the plastic box is additionally provided with the handle mounting portion for installing assist handle, handle peace Dress portion is surrounded by the first space, and at least partly described support tube is located in first space.

Optionally, it is big along the axial length of the cylinder assembly to be located at the part in first space for the support tube In be equal to the handle mounting portion along the cylinder assembly axial length 1/3.

Optionally, the first support portion for being used to support the preceding end bearing, first support portion are formed on support tube In first space.

Optionally, the first axially extending mounting hole along the cylinder assembly is formed on the plastic box, it is described The front end of support tube is fixed in first mounting hole.

Optionally, the radial and inwardly projecting protrusion along the support tube is provided on the inner wall of the plastic box Portion, the protrusion are connected with the fixed edge turned down along the direction far from the work head, inner wall, the protrusion of the plastic box First mounting hole is collectively formed in portion and fixed edge.

Optionally, it is provided with limiting slot on the inner wall of the support tube, finite place piece is set in the limiting slot, by institute End bearing is limited between the locating part and the fixed edge before stating.

Optionally, the metalwork includes: support ring, and the support ring setting deviates from the work in the plastic box The rear end of head, the support ring are used to support oiliness bearing, wherein after the oiliness bearing is set in the cylinder assembly End.

Optionally, the support ring has the second support portion for being used to support the oiliness bearing, second support portion Rear end be additionally provided with the limiting section extended towards the cylinder block, the front bulkhead of the limiting section and second support portion Inner wall surround accommodation space jointly, the accommodation space is for accommodating at least partly described oiliness bearing.

Optionally, second support portion is less than or equal to the oiliness bearing edge along the axial length of the cylinder assembly The axial length of the cylinder assembly.

Optionally, the support ring is plugged in the plastic box.

Optionally, lightening hole is provided on the metalwork.

Optionally, the casing further include: the rear cover being made of plastics, the rear cover lid are located at the Gearbox Rear end, and the rear cover and Gearbox sealing cooperate.

Optionally, internal cavities are formed in the casing；Eccentric shaft assembly and jackshaft group are provided in the casing Part, the bias shaft assembly and intermediate shaft assembly seal with the Gearbox and cooperate, and the internal cavity is separated For mutually independent first cavity and the second cavity, first cavity is located at the top of second cavity.

Optionally, the intermediate shaft assembly is cooperated by the first sealing bearing and Gearbox sealing.

Optionally, described to state casing further include: middle cover, the middle cover are located at the lower section of the Gearbox, it is described in Lid cooperates with Gearbox sealing.

Optionally, the eccentric shaft assembly has the second sealing bearing, is arranged with bearing holder (housing, cover) on the second sealing bearing, The bearing holder (housing, cover) and the sealing of the Gearbox and middle cover cooperate.

Optionally, the sealing means between the middle cover, bearing holder (housing, cover) and Gearbox are labyrinth sealing.

Optionally, the bearing holder (housing, cover) includes: the body being set on the second sealing bearing, and the lower end of the body is set It is equipped with the flanging turned down outward, the flanging cooperates away from the lateral wall and Gearbox of body；The part fold While riding upon on middle cover, the part that the flanging rides upon the middle cover is additionally provided with the extension extended downwardly, extension It is contacted with the inner sidewall of middle cover.

Optionally, the second mounting hole for installing the eccentric shaft assembly is provided on the Gearbox, it is described The sealing edge for being provided with the radial direction along the bearing holder (housing, cover) on the part hole wall of second mounting hole and extending towards the bearing holder (housing, cover), institute State that flanging is folded to be located on the downside of the sealing edge, and the sealing edge is contacted with the flanging.

Electric hammer provided by the utility model, including the Gearbox with plastic box and metalwork, plastic box tool There is relatively small density, so, it is possible the weight for substantially reducing Gearbox, meanwhile, by the way that metalwork, metalwork is arranged Enabling capabilities with higher are able to bear the support strength for guaranteeing Gearbox compared with big load, thus, not only subtract significantly The light weight of electric hammer complete machine, additionally it is possible to guarantee the support strength of electric hammer complete machine.In addition, internal cavity be divided into it is mutually independent First cavity and the second cavity, it is internal to inject different lubricating oil, improve the reliability of complete machine.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of electric hammer provided in this embodiment；

Fig. 2 is the structural schematic diagram of Gearbox in electric hammer provided in this embodiment；

Fig. 3 is the structural schematic diagram of Gearbox and cylinder assembly in electric hammer provided in this embodiment；

Fig. 4 is the partial enlargement diagram of A in Fig. 3；

Fig. 5 is the partial enlargement diagram of B in Fig. 3；

Fig. 6 is Gearbox in electric hammer provided in this embodiment, cylinder assembly, intermediate shaft assembly and eccentric shaft assembly Assembling schematic diagram；

Fig. 7 is the partial enlargement diagram of C in Fig. 6.

Description of symbols:

1000- casing；The first cavity of 1000a-；The second cavity of 1000b-；

1100- Gearbox；1110- plastic box；1111- handle mounting portion；

1113- protrusion；1114- fixed edge；1115- sealing edge；

1116- positioning bar；The second mounting hole of 1117-；1118- third mounting hole；

1120- metalwork；1121- support tube；The first support portion of 1121a-；

1123- locating part；1122- support ring；The second support portion of 1122a-；

1122b- limiting section；1200- rear cover；1300- middle cover；

2000- work head；3100- cylinder assembly；End bearing before 3101-；

3102- oiliness bearing；3103- second bevel gear；3200- bias shaft assembly；

3201- second seals bearing；3202- bearing holder (housing, cover)；3202a- body；

3202b- flanging；3202c- extension；3300- intermediate shaft assembly；

3301- first seals bearing；3302- first bevel gear；3400- motor mechanism.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.

Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.In the absence of conflict, following implementation Feature in example and embodiment can be combined with each other.

Wherein, the term of "upper", "lower", "front", "rear" etc. is for describing the relative position of each structure in the accompanying drawings Relationship, only being illustrated convenient for narration, rather than to limit the enforceable range of the utility model, the change of relativeness or Adjustment, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the utility model.

Fig. 1 is the structural schematic diagram of electric hammer provided in this embodiment；Fig. 2 is reduction gearbox case in electric hammer provided in this embodiment The structural schematic diagram of body.

Fig. 1-2 is please referred to, the present embodiment provides a kind of electric hammer, specially vertical electric hammer, comprising: casing 1000, the machine The front end of shell 1000 is used for attended operation handle for connecting work head 2000, the rear end of casing 1000.Setting in casing 1000 There are motor mechanism 3400 and transmission mechanism, transmission mechanism is connected between motor mechanism 3400 and work head 2000, so that motor Mechanism 3400 is supplied to work head 2000 by transmission mechanism and is rotatably driven power, and is supplied to work head by transmission mechanism 2000 along impact direction impact force.

Transmission mechanism specifically includes: eccentric shaft assembly 3200, intermediate shaft assembly 3300 and cylinder assembly 3100；Eccentric shaft group Part 3200 and intermediate shaft assembly 3300 are connect with the output end of motor mechanism 3400, eccentric shaft assembly 3200 and intermediate shaft assembly 3300 axial direction and the axially vertical setting of cylinder assembly 3100.Wherein, cylinder assembly 3100 includes cylinder block, piston mechanism And hammer mechanism；The front end of cylinder block towards work head 2000 is provided with pivoted housing, and pivoted housing turns for accommodating work head 2000 The output shaft of electric hammer is collectively formed in set and cylinder block.

In the course of work of electric hammer, motor mechanism 3400 drives eccentric shaft assembly 3200 to rotate, eccentric shaft assembly 3200 For driving piston mechanism reciprocating air in cylinder block, so that the air pressure in cylinder block is in periodically change Change, to drive the top of hammer mechanism reciprocating hammer work head 2000.Meanwhile motor mechanism 3400 drives intermediate shaft assembly 3300 rotations, intermediate shaft assembly 3300 drive cylinder assembly 3100 and work head 2000 to be rotated；Wherein, jackshaft group The output end of part 3300 is provided with first bevel gear 3302, and second bevel gear 3103 is provided on cylinder assembly 3100, passes through The rotary motion of the intermediate shaft assembly 3300 is passed to air cylinder group with engaging for second bevel gear 3103 by one bevel gear 3302 The rotary motion is passed to work head 2000 by the cylinder block of part 3100, the output shaft formed by cylinder block and pivoted housing.

The casing 1000 includes Gearbox 1100, and cylinder assembly 3100 is located in Gearbox 1100.

Wherein, plastic box 1110 specifically can be with injection molding.The front end of plastic box 1110 is connected with sliding sleeve, sliding sleeve tool Body can be set in plastic box 1110, and work head 2000 is threaded through in sliding sleeve, and work head 2000 stretches out sliding sleeve setting.Gold Belonging to part 1120 is specially support device made of metal material, can be specifically made of aluminium alloy, to further decrease reduction gearbox The weight of cabinet 1100；Metalwork 1120 can be specifically embedded in plastic box 1110 or metalwork 1120 can pass through The connection types such as be spirally connected, be interference fitted are fixedly connected with plastic box 1110.

During specific implementation, bear to can be set compared with the region of big load with good bearing capacity on deceleration box Metalwork 1120, other regions of Gearbox 1100 use lighter in weight plastic box 1110.Due to air cylinder group Part 3100 is revolving part, and it is fixing piece that Gearbox 1100 is opposite, between cylinder assembly 3100 and Gearbox 1100 It is provided with bearing, bearing then can apply biggish load to Gearbox 1100, in 1100 spring bearing of Gearbox Metalwork 1120 then can be set in region, and metalwork 1120 with plastic box 1110 specifically to be wholely set, for example, by using in mould Shooting Technique is realized.

In a kind of optional embodiment of the present embodiment, plastic box 1110 may include at least two mutually independent Seperated portion, adjacent two fission portion intervals setting, and it is connected with metalwork 1120 between two adjacent fission portions, by metal The support of part 1120 generates the component compared with big load.So set, both will not influence the space inside Gearbox 1100, together When, metalwork 1120 can have bigger thickness to bear bigger load, thus, Gearbox 1100 can have more Reliable support strength.In addition, the present embodiment is not specifically limited the quantity in seperated portion, it specifically can be according to actual needs It is configured.

In another optional embodiment of the present embodiment, the plastic box 1110 in Gearbox 1100 can be with one Body setting, to simplify its moulding process.Plastic box 1110 bears that metalwork 1120, metalwork is arranged compared with the region of big load 1120 specifically can be set in plastic box 1110, so that the load of the component in plastic box 1110 is directly applied to metal Part 1120, to reduce the damage to plastic box 1110.Metalwork 1120 can specifically be supported on cylinder assembly 3100 and modeling Between hopper body 1110.

Electric hammer provided in this embodiment, including the Gearbox 1100 with plastic box 1110 and metalwork 1120, Plastic box 1110 has relatively small density, so, it is possible the weight for substantially reducing Gearbox 1100, meanwhile, lead to Setting metalwork 1120 is crossed, the enabling capabilities with higher of metalwork 1120 are able to bear compared with big load to guarantee reduction gearbox case The support strength of body 1100, thus, not only significantly reduce the weight of electric hammer complete machine, additionally it is possible to guarantee that the support of electric hammer complete machine is strong Degree.

Below to the structure of deceleration box is described in detail in casing 1000 in electric hammer.

Fig. 3 is the structural schematic diagram of Gearbox and cylinder assembly in electric hammer provided in this embodiment；Fig. 4 is A in Fig. 3 Partial enlargement diagram；Fig. 5 is the partial enlargement diagram of B in Fig. 3.

Referring to figure 3. -5, and with continued reference to Fig. 1-2, optionally, the metalwork 1120 includes: support tube 1121, described The plastic box 1110 is arranged in towards the front end of the work head 2000 in support tube 1121, and the support tube 1121 is for branch End bearing 3101 before supportting；Wherein, the preceding end bearing 3101 is set in the front end of the cylinder assembly 3100.

Support tube 1121 is specifically plugged in plastic box 1110, by preceding end bearing 3101 and plastic box 1110 every It opens, before support while end bearing 3101, additionally it is possible to impact wear of the end bearing 3101 to plastic box 1110 before reducing.Branch Stay tube 1121 can be specifically interference fitted with plastic box 1110, to further decrease the impact failure to plastic box 1110. Alternatively, support tube 1121 and 1110 clearance fit of plastic box, support between support tube 1121 and plastic box 1110 and are equipped with bullet Property part, plastic box 1110 and support tube are realized by frictional force between elastic component and support tube 1121, plastic box 1110 It is relatively fixed between 1121, simultaneously, additionally it is possible to which bearing and support tube 1121 are buffered to plastic box by the deformation of elastic component 1110 impact.

Optionally, the first axially extending installation along the cylinder assembly 3100 is formed on the plastic box 1110 Hole, the front end of the support tube 1121 are fixed in first mounting hole, to guarantee support tube 1121 and plastic box Reliable location between 1110.Wherein, the first mounting hole is the closed loop of the circumferentially extending along support tube 1121.

Specifically, inwardly projecting protrusion 1113, the protrusion are provided on the inner wall of the plastic box 1110 1113 be connected with along far from the work head 2000 direction turn down fixed edge 1114, the Gearbox 1100 it is interior Wall, protrusion 1113 and fixed edge 1114 surround first mounting hole jointly.It the front end of support tube 1121 specifically can be with First mounting hole interference fit or support tube 1121 with fixed edge 1114 by welding, the modes such as be bonded be fixedly connected, with guarantor Demonstrate,prove the connection reliability between support tube 1121 and plastic box 1110.

Due to being equipped with assist handle on the plastic box 1110, assist handle, which can also apply plastic box 1110, to be carried Metalwork 1120 has also can be set in lotus, therefore, the region that assist handle is installed on plastic box 1110.Slow down to reduce Number of parts in box body 1100 can improve respective area by support tube 1121 convenient for the assembly of Gearbox 1100 The support strength in domain.

Optionally, plastic box 1110 has the handle mounting portion 1111 for installing assist handle, handle mounting portion 1111 are surrounded by the first space, and at least partly described support tube 1121 is located in first space.Specifically, the support tube Pacify along the axial length of the cylinder assembly 3100 more than or equal to the handle 1121 parts being located in first space Dress portion 1111 along the cylinder assembly 3100 axial length 1/3, preferably to improve the enabling capabilities to assist handle； For example, support tube 1121 can be entirely located in the first space, the entire length of support tube 1121 is pacified more than or equal to the handle Dress portion 1111 along the cylinder assembly 3100 axial length 1/3.

Optionally, the first support portion 1121a for being used to support the preceding end bearing 3101, institute are formed on support tube 1121 It states the first support portion 1121a to be located in first space, in this way, preferably supporting assist handle agent front end in support tube 1121 While bearing 3101, additionally it is possible to reduce the length of support tube 1121, mitigate the weight of support tube 1121, further decrease electric hammer The weight of complete machine.

In the present embodiment, it is provided with limiting slot on the inner wall of the support tube 1121, limit is provided in the limiting slot Part 1123 is limited between the locating part 1123 and the fixed edge 1114 with the preceding end bearing 3101, is realized to front end Bearing 3101 is reliably fixed.Wherein, locating part 1123 is specifically as follows rubber ring etc..

Optionally, the metalwork 1120 further include: support ring 1122, the support ring 1122 are arranged in the plastic box Body 1110 deviates from the rear end of the work head 2000, and the support ring 1122 is used to support oiliness bearing 3102, wherein described to contain Oil bearing 3102 is set in the rear end of the cylinder assembly 3100.

Specifically, the support ring 1122 can be plugged in the plastic box 1110, by oiliness bearing 3102 with Plastic box 1110 separates, while supporting oiliness bearing 3102, additionally it is possible to reduce oiliness bearing 3102 to plastic box 1110 impact wear.Support ring 1122 is specifically interference fitted with plastic box 1110, to further decrease to plastic box 1110 impact failure.Alternatively, support ring 1122 and 1110 clearance fit of plastic box, in support ring 1122 and plastic box It is supported between 1110 and is equipped with elastic component, plastics are realized by the frictional force between elastic component and support ring 1122, plastic box 1110 It is relatively fixed between cabinet 1110 and support ring 1122, simultaneously, additionally it is possible to which bearing and support are buffered by the deformation of elastic component Impact of the ring 1122 to plastic box 1110.It is, of course, also possible to by welding, the modes such as be bonded or be embedded for support ring 1122 It is relatively fixed with plastic box 1110.

The support ring 1122 has the second support portion 1122a for being used to support the oiliness bearing 3102, the second support Portion 1122a is specifically set on oiliness bearing 3102；The rear end of the second support portion 1122a is additionally provided with towards the cylinder The limiting section 1122b that cylinder body extends, the front bulkhead of the limiting section 1122b and the inner wall of the second support portion 1122a are common Accommodation space is surrounded, the accommodation space is for accommodating at least partly described oiliness bearing 3102, thus by oiliness bearing 3102 It is limited between second bevel gear 3103, realizes being reliably fixed to oiliness bearing 3102.Optionally, second support portion 1122a is less than or equal to the oiliness bearing 3102 along the cylinder assembly 3100 along the axial length of the cylinder assembly 3100 Axial length, in order to avoid support ring 1122 interferes the movement of second bevel gear 3103.

Conventionally, as the rear end of second bevel gear 3103 is relatively large in diameter, cause to be supported on second bevel gear 3103 rear ends, the diameter with highdensity oiliness bearing 3102 it is also larger, aggravated the weight of electric hammer complete machine.The present embodiment In, by the metalwork 1120 of setting support oiliness bearing 3102, the radial dimension of oiliness bearing 3102, phase can be reduced relatively To the weight for reducing oiliness bearing 3102, the density of metalwork 1120 is also smaller with respect to the density of oiliness bearing 3102 in addition, from And the weight of electric hammer complete machine can be further decreased.

Optionally, in order to further decrease the weight of electric hammer complete machine, lightening hole can also be opened up on becket.Wherein, subtract Repeated hole is uniformly provided in becket, in order to avoid occur stress concentration phenomenon in becket.Certainly, loss of weight can be opened up on metal tube Hole, to further decrease the weight of electric hammer complete machine.

The overall structure of casing 1000 in electric hammer is described in detail below.

Fig. 6 is Gearbox in electric hammer provided in this embodiment, cylinder assembly, intermediate shaft assembly and eccentric shaft assembly Assembling schematic diagram；Fig. 7 is the partial enlargement diagram of C in Fig. 6.

Fig. 6-7 is please referred to, and with continued reference to Fig. 1-5, optionally, the casing 1000 further include: after being made of plastics Lid 1200, further to mitigate the weight of battery complete machine.The rear cover 1200 covers the rear end for being located at the Gearbox 1100, And the rear cover 1200 cooperates with the Gearbox 1100 sealing；Specifically, rear cover 1200 and the Gearbox The sealing elements such as sealing ring or gasket can be set between 1100, and the fixation that is spirally connected.

In the present embodiment, the Gearbox 1100 constituted using plastic box 1110 and metalwork 1120, and using modeling Rear cover 1200 made of expecting can be by electric hammer complete machine compared with the existing technology for casing 1000 made of middle use all-metal Weight reduce at least 300 grams, simultaneously, additionally it is possible to guarantee the support strength of electric hammer complete machine.

In addition, described state casing 1000 further include: middle cover 1300, the middle cover 1300 are located at the Gearbox 1100 Lower section, the middle cover 1300 cooperates with the Gearbox 1100 sealing.Middle cover 1300 can be using metal material (e.g., Aluminium, magnesium alloy etc.) it is made, to be further ensured that the support strength of electric hammer.Middle cover 1300 and the Gearbox 1100 it Between the sealing elements such as sealing ring or gasket can be set, and screw connection is fixed.Also, it can be on Gearbox 1100 It is provided with positioning bar 1116, positioning bar 1116 is extended preset length along the inner circumferential of middle cover 1300, installs by middle cover 1300 When on to Gearbox 1100, positioning bar 1116 can be realized the pre-determined bit to middle cover 1300, be easily installed, and positioning bar 1116 can also contact namely be bonded setting with the inner wall of middle cover 1300, with improve middle cover 1300 and Gearbox 1100 it Between sealing performance.

In addition, middle cover 1300 is also connect with electric machine casing, at least partly motor mechanism 3400 is housed in electric machine casing, with Preferably protect motor mechanism 3400；Meanwhile motor mechanism 3400 is fixedly connected with motor case, it is enough to improve motor oneself 3400 installation reliability；Wherein, motor case constitutes a part of casing 1000.

Internal cavities, eccentric shaft assembly 3200, intermediate shaft assembly 3300 and air cylinder group are formed in the casing 1000 Parts 3100 etc. are arranged in internal cavities.Due between eccentric shaft assembly 3200 and intermediate shaft assembly 3300 and motor mechanism 3400 Connection type be gear engagement, it is desirable that it is anti-wear, it is more preferable using the effect of viscous crude；And eccentric shaft assembly 3200 and centre There is the component moved back and forth in the cylinder assembly 3100 of 3300 upper end of shaft assembly, it is more preferable using the preferable lubricant of mobility.

In the prior art, the internal cavities in casing 1000 are that a cavity is then moved back and forth according to viscous lubrication Viscous crude is easily carbonized by component；It is lubricated according to lubricants such as the preferably pure oil of mobility, then the sealing to casing 1000 everywhere Performance requirement is higher, increases the cost of electric hammer.

To solve this problem, in electric hammer provided in this embodiment, the bias shaft assembly 3200 and intermediate shaft assembly 3300 It seals and cooperates with the Gearbox 1100, the internal cavity is divided into mutually independent first cavity 1000a And second cavity 1000b, the first cavity 1000a be located at the top of the second cavity 1000b.Such as the L in Fig. 6, on L For the first cavity 1000a；It is the second cavity 1000b under L.The top of eccentric shaft assembly 3200, intermediate shaft assembly 3300 it is upper Portion and cylinder assembly 3100 are located in the first cavity 1000a；The lower part of eccentric shaft assembly 3200 and intermediate shaft assembly 3300 then position In the second cavity 1000b, and the part that eccentric shaft assembly 3200 and intermediate shaft assembly 3300 are engaged with motor mechanism 3400 In the second cavity 1000b.

In this way, can be according to the lubrication needs of the component in the first cavity 1000a and the second cavity 1000b, respectively to Unused lubricant is injected in one cavity 1000a and the second cavity 1000b.It, can be to the first cavity during specific implementation The preferable lubricant of the mobility such as pure oil is injected in 1000a, improves and the lubrication of each moving component in the first cavity 1000a is imitated Fruit reduces abnormal sound and abrasion and reduces fever, reduces grease carbonization phenomenon；Viscous crude is injected into the second cavity 1000b, to improve Antiwear effect, while the seal request to the second cavity 1000b is reduced, reduce oil leakage phenomenon.

Specifically, the intermediate shaft assembly 3300 is sealed by the first sealing bearing 3301 and the Gearbox 1100 Cooperation.The bias shaft assembly 3200 has the second sealing bearing 3201, is arranged with bearing on the second sealing bearing 3201 Set 3202, the bearing holder (housing, cover) 3202 cooperate with the Gearbox 1100 and the sealing of middle cover 1300.In this way, Gearbox 1100, rear cover 1200 and bearing holder (housing, cover) 3202 surround the first cavity 1000a in the top of bearing holder (housing, cover) 3202；Gearbox 1100, Middle cover 1300 and bearing holder (housing, cover) 3202 surround the second cavity 1000b in the lower section of bearing holder (housing, cover) 3202.

Wherein, the third mounting hole 1118 for installing intermediate shaft assembly 3300 is offered on Gearbox 1100, the One sealing bearing 3301 and the sealing of third mounting hole 1118 cooperate, specifically can be close by interference fit, filling with sealant, setting The modes such as sealing are realized.

Optionally, the sealing means between the middle cover 1300, bearing holder (housing, cover) 3202 and Gearbox 1100 are labyrinth type Sealing reduces oil leakage phenomenon to extend the permeation pathway of lubricant.

Specifically, bearing holder (housing, cover) 3202 includes: the body 3202a being set on the second sealing bearing 3201, body 3202a's Lower end is provided with the flanging 3202b turned down outward, and flanging 3202b deviates from the lateral wall and Gearbox of body 3202a 1100 side wall cooperation；The part that flanging 3202b cooperates with middle cover 1300 rides upon on middle cover 1300 and is provided with to downward The extension 3202c stretched, extension 3202c are bonded setting with the inner sidewall of middle cover 1300, thus in bearing holder (housing, cover) 3202, reduction gearbox Labyrinth sealing is formed between cabinet 1100 and middle cover 1300.

In addition, Gearbox 1100 offers the second mounting hole 1117 for setting-up eccentricity shaft assembly 3200, second The sealing edge 1115 extended towards bearing holder (housing, cover) 3202, the flanging of bearing holder (housing, cover) 3202 are provided on the part hole wall of mounting hole 1117 3202b folds the lower section for being located at sealing edge 1115 and fits closely, to guarantee that the first cavity 1000a and the second cavity 1000b is mutual It is independent.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (22)

1. a kind of electric hammer characterized by comprising casing (1000) is provided with motor mechanism in the casing (1000) (3400), the motor mechanism (3400) has motor shaft；Output shaft, the output shaft are additionally provided in the casing (1000) It is arranged with the motor shaft in angle, the output shaft is for accommodating work head (2000)；

Wherein, the casing (1000) includes: Gearbox (1100), and the Gearbox includes plastic box (1110) And the metalwork (1120) being arranged on the plastic box (1110).

2. electric hammer according to claim 1, which is characterized in that be provided with cylinder assembly in the Gearbox (1100) (3100), the metalwork (1120) is used to support the cylinder assembly (3100)；Wherein, the cylinder assembly (3100) includes Cylinder block, the cylinder block form at least partly described output shaft.

3. electric hammer according to claim 2, which is characterized in that the metalwork (1120) includes: support tube (1121), institute State front end of support tube (1121) setting in the plastic box (1110) towards the work head (2000), the support tube (1121) preceding end bearing (3101) are used to support；Wherein, the preceding end bearing (3101) is set in the cylinder assembly (3100) Front end.

4. electric hammer according to claim 3, which is characterized in that the front end of the plastic box (1110), which is additionally provided with, to be used for The handle mounting portion (1111) of assist handle is installed, handle mounting portion (1111) is surrounded by the first space, at least partly described branch Stay tube (1121) is located in first space.

5. electric hammer according to claim 4, which is characterized in that the support tube (1121) is located in first space Part is more than or equal to the handle mounting portion (1111) along the air cylinder group along the axial length of the cylinder assembly (3100) The 1/3 of the axial length of part (3100).

6. electric hammer according to claim 4, which is characterized in that be formed on support tube (1121) and be used to support the front end The first support portion (1121a) of bearing (3101), first support portion (1121a) are located in first space.

7. electric hammer according to claim 3, which is characterized in that be formed on the plastic box (1110) along the cylinder The first axially extending mounting hole of component (3100), the front end of the support tube (1121) are fixed at first installation Kong Zhong.

8. electric hammer according to claim 7, which is characterized in that be provided on the inner wall of the plastic box (1110) along institute The radial and inwardly projecting protrusion (1113) of support tube (1121) is stated, the protrusion (1113) is connected with along far from described The fixed edge (1114) of the direction fold of work head (2000), the inner wall of the plastic box (1110), protrusion (1113) with And first mounting hole is collectively formed in fixed edge (1114).

9. electric hammer according to claim 8, which is characterized in that be provided with limit on the inner wall of the support tube (1121) Slot is arranged finite place piece (1123) in the limiting slot, the preceding end bearing (3101) is limited in the locating part (1123) between the fixed edge (1114).

10. electric hammer according to claim 2, which is characterized in that the metalwork (1120) includes: support ring (1122), Support ring (1122) setting deviates from the rear end of the work head (2000), the support ring in the plastic box (1110) (1122) oiliness bearing (3102) are used to support, wherein the oiliness bearing (3102) is set in the cylinder assembly (3100) Rear end.

11. electric hammer according to claim 10, which is characterized in that the support ring (1122), which has, is used to support described contain The rear end of the second support portion (1122a) of oil bearing (3102), second support portion (1122a) is additionally provided with towards the gas The limiting section (1122b) that cylinder cylinder body extends, the front bulkhead of the limiting section (1122b) and second support portion (1122a) Inner wall surrounds accommodation space jointly, and the accommodation space is for accommodating at least partly described oiliness bearing (3102).

12. electric hammer according to claim 11, which is characterized in that second support portion (1122a) is along the air cylinder group The axial length of part (3100) is less than or equal to the axial length of the oiliness bearing (3102) along the cylinder assembly (3100) Degree.

13. electric hammer according to claim 10, which is characterized in that the support ring (1122) is plugged in the plastic box (1110) in.

14. -13 described in any item electric hammers according to claim 1, which is characterized in that be provided with and subtract on the metalwork (1120) Repeated hole.

15. -13 described in any item electric hammers according to claim 1, which is characterized in that the casing (1000) further include: by moulding Rear cover (1200) made of expecting, rear cover (1200) lid are located at the rear end of the Gearbox (1100), and the rear cover (1200) cooperate with the Gearbox (1100) sealing.

16. -13 described in any item electric hammers according to claim 1, which is characterized in that be formed with inside in the casing (1000) Cavity；Eccentric shaft assembly (3200) and intermediate shaft assembly (3300), the bias shaft assembly are provided in the casing (1000) (3200) and intermediate shaft assembly (3300) seals with the Gearbox (1100) and cooperates, and the internal cavity is separated For mutually independent first cavity (1000a) and the second cavity (1000b), first cavity (1000a) is located at described second The top of cavity (1000b).

17. electric hammer according to claim 16, which is characterized in that the intermediate shaft assembly (3300) passes through the first sealing axis (3301) and the Gearbox (1100) sealing is held to cooperate.

18. electric hammer according to claim 16, which is characterized in that described to state casing (1000) further include: middle cover (1300), The middle cover (1300) is located at the lower section of the Gearbox (1100), the middle cover (1300) and the Gearbox (1100) sealing cooperation.

19. electric hammer according to claim 18, which is characterized in that the bias shaft assembly (3200) has the second sealing axis It holds (3201), is arranged with bearing holder (housing, cover) (3202) in second sealing bearing (3201), the bearing holder (housing, cover) (3202) subtracts with described Fast box body (1100) and middle cover (1300) sealing cooperation.

20. electric hammer according to claim 19, which is characterized in that the middle cover (1300), bearing holder (housing, cover) (3202) and deceleration Sealing means between box body (1100) are labyrinth sealing.

21. electric hammer according to claim 20, which is characterized in that the bearing holder (housing, cover) (3202) includes: to be set in described Body (3202a) in two sealings bearing (3201), the lower end of the body (3202a) is provided with the flanging turned down outward (3202b), the flanging (3202b) cooperate away from the lateral wall of body (3202a) and Gearbox (1100)；Part institute It states flanging (3202b) to ride upon on middle cover (1300), the flanging (3202b) rides upon the part of the middle cover (1300) It is additionally provided with the extension (3202c) extended downwardly, extension (3202c) is contacted with the inner sidewall of middle cover (1300).

22. electric hammer according to claim 21, which is characterized in that be provided on the Gearbox (1100) for pacifying The second mounting hole of the eccentric shaft assembly (3200) is filled, is provided on the part hole wall of second mounting hole along the bearing The sealing edge (1115) for covering the radial direction of (3202) and extending towards the bearing holder (housing, cover) (3202), the flanging (3202b) is folded to be set On the downside of the sealing edge (1115), and the sealing edge (1115) is contacted with the flanging (3202b).