CN101137855A

CN101137855A - Bearing arrangement for a hand tool

Info

Publication number: CN101137855A
Application number: CNA2006800078974A
Authority: CN
Inventors: A·乌尔里希
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2005-03-11
Filing date: 2006-02-06
Publication date: 2008-03-05
Also published as: EP1861631A1; DE102005011326A1; WO2006094865A1

Abstract

The invention relates to a bearing arrangement (51) of a shaft (52) of a hand tool (2), especially a boring hammer (3), comprising a bearing region (23) which is associated with the shaft (52) and with which a lubricant store (25) filled with lubricant (24) is associated for the lubrication thereof. According to the invention, the lubricant store (25) is sealed by means of at least one sealing element (31, 32).

Description

The bearing means of hand-held tool

The present invention relates to a kind of hand-held tool, especially bore the bearing means of the axle of hammer, have a configuration and give this support region, for lubricated this support region is given this lubricant reservoir portion that is filled with oiling agent of support region configuration.

Aforesaid bearing means for example uses in boring hammer, especially combines with conversion equipment, for example is used to change different working methods.Usually supporting structural member on the employed axle here, described structural member needs at least one, compares two supporting positions under the bigger situation with bearing diameter in structure length, described axle is used for transmission power, rotation, torque and/or the moment of momentum on the one hand, broadly is used for conversion on the other hand.This bearing means for example can be configured to the oscillation bearing device, and this oscillation bearing device is used to turn on and off beater mechanism.It is to arrange two kinds of different working methods that this oscillation bearing is installed on.In first working method " percussive drilling ", this oscillation bearing makes this oscillation bearing rotate and to drive beater mechanism with live axle by suitable switching mechanism and the live axle mechanical connection that bores hammer thus.In second working method " no percussive drilling ", oscillation bearing and live axle are thrown off coupling, make live axle free to rotate thus, and oscillation bearing rotate not together.Decide on working method, different load is born at the supporting position between oscillation bearing device and the live axle.After working long hours, hand-held tool produces the danger that makes the oscillation bearing possible breakdown owing to strong load.

Support the position openly for lubricated: in the structure space of bearing means and/or in the housing of hand-held tool, add oiling agent.In order to produce the oiling agent deposit, open: as in the zone of bearing means or in the zone at supporting position, to form lubricant reservoir portion.Because this hand-held tool occupies different working positions at work in the space, so, for essential lubricated and join in the housing of hand-held tool and/or in the working space of bearing means and/or the oiling agent in the lubricant reservoir portion since gravity in housing and/or working space internal flow, especially under the situation of the high temperature of long run duration and the thing followed.Additionally dangerous in hand-held tool work: as to be positioned at the oiling agent on the bearing means and to be positioned at especially that oiling agent on the axle throws away and/or to flow out and loss occurs for lubricated thus from lubricant reservoir portion.Always produce the shortage lubricating status.

The invention is characterized in that lubricant reservoir portion is by means of at least one seal element sealing.Oiling agent was retained in the lubricant reservoir portion on the whole working life of hand-held tool, especially brill hammer.Even hand-held tool is worked in different positions, seal element also stops oiling agent to flow out with violating the rules or flows away.

Propose in a favourable further configuration, seal element disposes to support region.Avoid oiling agent just in time in support region, to flow out to the full extent by being arranged in like this.

Another favourable further configuration of the present invention proposes the direct adjacency of seal element and support region.Make thus and directly in support region, very well keep oiling agent.Promptly avoid oiling agent to leak from support region, this is as issuable in the described known layouts in the above.In addition, can make do not have other for example to enter into support region and by oiling agent seal arrangement according to the present invention there owing to cause damage with the incompatibility of special oiling agent for the bearing adding from the oiling agent of the drive motor of hand-held tool and/or transmission device.Can in support region, use thus and other different special oiling agent of oiling agent that in boring hammer, uses, and different oiling agents can not mix.Avoid pollutant to enter into support region in addition, this pollutant for example can be brought in the housing of hand-held tool or otherwise arrives near the support region by the cooling air guide device.Thus, except better, promptly long-time continue and special lubricated, also provide higher functional reliability by reducing owing to bringing the failure risk that pollutant produces into.

A further configuration of the present invention proposes, and this bearing means is configured to the oscillation bearing device and can works by means of the axle that is configured to live axle.Oscillation bearing device according to the present invention compares with the traditional wobble bearing means because the always guaranteed lubricated very long expected life that has.

A further configuration of the present invention proposes, this bearing means has first and second bearing elements, wherein, the clutch shaft bearing element in first working method, do not have relatively rotate with live axle coupling and in second working method, be bearing on the live axle of rotation by means of support region.Produce the conversion between the different operating mode of hand-held tool by this layout, wherein, bearing element from oiling agent according to the present invention keeps by acquiring benefit very long working life.

A further configuration of the present invention proposes, and seal element is arranged between clutch shaft bearing element and the live axle.At this advantageously, be provided with at least one bearing between lubricant reservoir portion and seal element, thus, this bearing is supplied with oiling agent, but oiling agent can not be discharged from support region.Especially seal element can be arranged on the axial end portion of the support region between clutch shaft bearing element and the live axle.

For also can be regarded as in the layout between clutch shaft bearing element and the live axle: seal element is arranged on clutch shaft bearing element and one and is arranged on regularly between structural member on the live axle, for example gear.Always importantly, oiling agent arrives support region, but can not discharge, and thus, support region " is not absorbed in drying regime ".

In addition advantageously, lubricant reservoir portion is arranged in the holding space that is configured between live axle and the clutch shaft bearing element.This holding space comprises the space that constitutes by the bearing play between clutch shaft bearing element and the live axle.In order to be provided for the additional holding space of oiling agent, one or more recesses can be set in live axle and/or in the bearing element.This recess for example can be used as non-around radial depressions portion or around depressed part realize.The holding space that provides by described recess promptly is to be filled with oiling agent and to form the oiling agent holding space of a corresponding big lubricant reservoir portion.

Especially advantageously, holding space is an annular space.This annular space can by a circular groove that in the shell surface of live axle, extends and/or one in the inboard of clutch shaft bearing element around the circular groove structure.Also can be adjacent to be provided with a plurality of circular grooves in the axial direction.The holding space that provides by described circular groove is the oiling agent holding space that is filled with oiling agent and formation lubricant reservoir portion.Also can be used as alternative or additionally propose, the clutch shaft bearing element is axially gone up the each intervals bearing that is provided with of turning up the soil and is bearing on the live axle by means of at least one bearing, preferred two.Owing to belong to the structure height of the bearing of support region, between live axle, clutch shaft bearing element and bearing or two bearings, form an annular space, this annular space is as the oiling agent holding space.

A further configuration of the present invention proposes, and annular space is observed on the longitudinal extension of live axle and sealed by means of seal element in the axial direction.Realize that thus oiling agent do not discharge in the axial direction along live axle or bearing element.

Especially advantageously, each seals by means of a seal element annular space on two axial end portion.The zone that is used for lubricant of a comprehensive sealing is provided thus.Corresponding therewith proposition, support region are arranged between two seal elements---and the clutch shaft bearing element is bearing on the live axle in this support region, supplies with oiling agent from lubricant reservoir portion to support region thus.

Seal element is preferably configured as seal ring.

In addition advantageously, seal element is configured to O shape ring, and this O shape ring preferably is made of elastic material.

A further configuration of the present invention proposes, and seal element is configured to Simmer ring, and this Simmer ring is also referred to as shaft sealer or radial seal ring.

Propose in addition, seal element is in the depressed part that partly is contained in live axle in the radial direction and/or in the depressed part in the clutch shaft bearing element.Make seal element fixing in the axial direction thus, make the sealing element not removable.In addition, especially be configured to around the depressed part of depressed part such possibility is provided: provide a relative big surface of contact between seal element and the depressed part, this surface of contact guarantees good sealing.Especially the cross-sectional profile form fit of depressed part and seal element ground is coordinated with each other.Especially depressed part is configured to circular groove.

Different further configuration according to the present invention proposes, and support region has at least one bearing that is configured to sliding bearing and/or rolling bearing and/or needle bearing and/or ball bearing.Preferably be provided with two bearings that are spaced apart from each other, have the lubricant reservoir portion that is filled with oiling agent between these bearings, wherein, this both sides that are arranged in are respectively sealed like this by a seal element, though make oiling agent arrive bearing, can not discharge from support region.

Favourable further configuration of the present invention is by obtaining in the dependent claims.

Accompanying drawing has illustrated the present invention by means of two embodiments.Accompanying drawing is represented:

Fig. 1 is according to first embodiment's oscillation bearing device,

Fig. 2 first embodiment's detailed view,

The detailed view of Fig. 3 another embodiment of the present invention.

Fig. 1 shows a hand-held tool that is not shown specifically 2, and promptly to bore hammer 3 bearing means 51 be the cross section view of oscillation bearing device 1.

Oscillation bearing device 1 allows two kinds of working methods at work.In first working method, promptly when percussive drilling, oscillation bearing device 1 is driven by an axle 52 that is configured to live axle 4 like this, make the piston 5 of a beater mechanism that is not shown specifically 6 move back and forth along impacting axis 7, thus, the to-and-fro motion owing to piston 5 makes beater mechanism 6 carry out impact function.In second working method, promptly when no percussive drilling, oscillation bearing device 1 is thrown off coupling with live axle 4, promptly is not driven, and piston 5 is not moved.

Oscillation bearing device 1 has a clutch shaft bearing element 8 and one second bearing element 9.In first working method, promptly when percussive drilling, clutch shaft bearing element 8 rotates around driving axis 10 with live axle 4; In second working method, promptly when no percussive drilling, clutch shaft bearing element 8 rotates not together.Clutch shaft bearing element 8 have on 11 in its outside one obliquely around groove 12.This groove with one on the inboard 13 of second bearing element 9 around groove 14 form an oscillation bearing 15, this oscillation bearing has some balls 16.

Bearing element

8 and 9 supports rotatably by means of oscillation bearing 15.In first working method, promptly when percussive drilling, the oscillation bearing 15 that constitutes thus that also can be described as pendulum bearing 17 causes the oscillating motion of second bearing element 9 based on the rotational motion of clutch shaft bearing element 8.This second bearing element makes piston 5 motions of beater mechanism 6 by bearing 18.

Live axle 4 is provided with the

axial guide

19 and 20 that two nothings are connected with live axle 4 with relatively rotating, and these axial guides are fixed on the live axle 4 clutch shaft bearing element 8 in the axial direction.Axial guide 19 is configured to gear 21, and this gear is carried out other in this function of not paid close attention to by the people.In first working method, promptly when percussive drilling, by a unshowned switching mechanism clutch shaft bearing element 8 is not had and be connected with live axle 4 with relatively rotating.Clutch shaft bearing element 8 is bearing on the live axle 4 by means of support region 23.Support region 23 has two

bearings

27 and 28, and these bearing constructions become rolling bearing 29 and 30.According to the present invention, the

rolling bearing

29 and 30 that is spaced apart from each other on axially respectively has a seal element 31 that separate or preferred compositions and 32.These two

seal elements

31 and 32 are lubricant reservoir portion 25 that is filled with oiling agent 24 of sealing like this, although make oiling agent 24 Castor Oil support regions 23, be rolling bearing 29 and 30, can not be in the axial direction along live axle 4 discharges.Lubricant reservoir portion 25 is contained in being configured in the holding space 47 of annular space 26 at this of constituting between live axle 4, clutch shaft bearing element 8 and two seal elements 31 and 32.The holding space 26 of Gou Chenging seals by two

seal elements

31 and 32 on two

axial end portion

34 and 35 like this.

Fig. 2 also shows the detailed view by means of seal element 31 and the 32 lubricant reservoir portions 25 that seal described in Fig. 1 with cross section view.Reference number is corresponding to the reference number of Fig. 1.Especially in Fig. 2, at length show two

rolling bearings

29 and 30 with seal element 31 and 32.These

rolling bearings

29 and 30 respectively have one and are used for retainer 45 that rolling element 33 is led and 46 and respectively have a

seal element

31 and 32 that extends on

circumference.Retainer

45 and 46 is pressed in the clutch shaft bearing element 8, and is configured to two

seal elements

31 and 32 effects of respectively playing live axle 4 sealings of flexible O shape ring 37 and 38.These two

rolling bearings

29 and 30 each such setting make rolling element 33 be in lubricant reservoir portion 25 and are connected.Thus, oiling agent 24 can arrive rolling element 33 and lubricated these rolling elements from lubricant reservoir portion 25.But oiling agent 24

encircles

37 and 38 sealing function owing to two O shapes and can not discharge.Annular space 26 in all directions, especially on two

axial end portion

34 and 35 sealing.

Fig. 3 also shows another embodiment's detailed view with cross section view.Support region 23 is configured to sliding bearing 36 in this embodiment, and this sliding bearing extends on the whole axial length of clutch shaft bearing element 8.On two

axial end portion

34 and 35, seal by means of two

O shape rings

37 and 38 at the annular space 26 that constitutes between live axle 4 and the clutch shaft bearing element 8.This

O shape ring

37 and 38 fixes and plays there seal action in the axial direction by

circular groove

39,40,41 and 42.

Circular groove

39 and 40 each intervals are turned up the soil and are arranged on the live axle 4.The

circular groove

41 and 42 that is configured on the clutch shaft bearing element 8 is positioned at these

circular grooves

39 and 40 opposites.In this embodiment, also sealing on two

axial end portion

34 and 35 of annular space 26 can not be discharged oiling agent 24 from this annular space thus.

Claims

Hand-held tool (2), especially bore the bearing means (51) of the axle (52) of hammer (3), have a configuration and give the support region (23) of this axle (52), for lubricated this support region is given this lubricant reservoir portion (25) that is filled with oiling agent (24) of support region configuration, it is characterized in that: this lubricant reservoir portion (25) seals by means of at least one seal element (31,32).
2. bearing means according to claim 1 is characterized in that: this support region (23) is given in described seal element (31,32) configuration.
3. described bearing means in requiring according to aforesaid right is characterized in that: described seal element (31,32) and the direct adjacency of this support region (23).
4. described bearing means in requiring according to aforesaid right is characterized in that: this bearing means is configured to oscillation bearing device (1) and can works by means of the axle (52) that is configured to live axle (4).
5. described bearing means in requiring according to aforesaid right, it is characterized in that: this bearing means has first and second bearing elements (8,9), wherein, this clutch shaft bearing element (8) in first working method, do not have relatively rotate with this live axle (4) coupling and in second working method, be bearing on the live axle (4) of this rotation by means of this support region (23).
6. described bearing means in requiring according to aforesaid right, it is characterized in that: described seal element (31,32) is arranged between this clutch shaft bearing element (8) and this live axle (4).
7. described bearing means in requiring according to aforesaid right, it is characterized in that: this lubricant reservoir portion (25) is arranged in the holding space (47) that is configured between this live axle (4) and this clutch shaft bearing element (8).
8. described bearing means in requiring according to aforesaid right, it is characterized in that: this holding space (47) is an annular space (26).
9. described bearing means in requiring according to aforesaid right, it is characterized in that: this annular space (26) is observed on the longitudinal extension of this live axle (4) in the axial direction and is sealed by means of described seal element (31,32).
10. described bearing means in requiring according to aforesaid right, it is characterized in that: this annular space (26) is gone up each at two axial end portion (34,35) and is sealed by means of a seal element (31,32).
11. according to described bearing means in the aforesaid right requirement, it is characterized in that: described seal element (31,32) is configured to seal ring.
12. according to described bearing means in the aforesaid right requirement, it is characterized in that: described seal element (31,32) is configured to O shape ring (37,38).
13. according to described bearing means in the aforesaid right requirement, it is characterized in that: described seal element (31,32) is configured to Simmer ring.
14. according to described bearing means in the aforesaid right requirement, it is characterized in that: described seal element (31,32) is in the depressed part that partly is contained in this live axle (4) in the radial direction and/or in this clutch shaft bearing element (8).
15. according to described bearing means in the aforesaid right requirement, it is characterized in that: described depressed part is configured to circular groove (39,40,41,42).
16. according to described bearing means in the aforesaid right requirement, it is characterized in that: this support region (23) has at least one bearing that is configured to sliding bearing (36) (27,28).
17. according to described bearing means in the aforesaid right requirement, it is characterized in that: this support region (23) has at least one bearing that is configured to rolling bearing (29,30) (27,28).
18. according to described bearing means in the aforesaid right requirement, it is characterized in that: this support region (23) has at least one bearing that is configured to needle bearing (27,28).
19. described bearing means in requiring according to aforesaid right is characterized in that: this support region (23) has two bearings (27,28) that are spaced apart from each other on axially, and wherein, this lubricant reservoir portion (25) is positioned between these bearings (27,28).
20. according to described bearing means in the aforesaid right requirement, it is characterized in that: described seal element (31,32) is combined in the described bearing (27,28).
21. according to described bearing means in the aforesaid right requirement, it is characterized in that: this oiling agent (24) is a lubricating grease.