CN109404514B - Supporting structure of eccentric wheel, transmission mechanism and electric tool - Google Patents
Supporting structure of eccentric wheel, transmission mechanism and electric tool Download PDFInfo
- Publication number
- CN109404514B CN109404514B CN201710693968.0A CN201710693968A CN109404514B CN 109404514 B CN109404514 B CN 109404514B CN 201710693968 A CN201710693968 A CN 201710693968A CN 109404514 B CN109404514 B CN 109404514B
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- Prior art keywords
- eccentric wheel
- eccentric
- circumferential surface
- support
- driving member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
- F16H21/18—Crank gearings; Eccentric gearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Transmission Devices (AREA)
Abstract
The invention provides a supporting structure of an eccentric wheel, a transmission mechanism and an electric tool, wherein the eccentric wheel is rotatably arranged on a machine body through an eccentric wheel mounting shaft, one end of the eccentric wheel is positioned at one side of the axis of the eccentric wheel, and a driving part is hinged to the position of one end of the eccentric wheel, wherein the supporting structure of the eccentric wheel comprises a supporting part fixedly connected to the machine body, the supporting part is at least contacted with the circumferential surface of the eccentric wheel, which deviates from the driving part, and the supporting part is contacted with the half circumferential surface of the eccentric wheel, which is close to the driving part. The supporting structure of the eccentric wheel can improve the stability and reliability of the eccentric wheel.
Description
Technical Field
The present invention relates to a supporting structure, and more particularly, to a supporting structure of an eccentric wheel, a transmission mechanism including the supporting structure of the eccentric wheel, and a power tool including the transmission mechanism.
Background
Some electric tool transmission mechanisms may be provided with an eccentric wheel as an intermediate member for power transmission, and a conventional electric hammer transmission mechanism is exemplified, which includes an eccentric wheel in power connection with a motor, the eccentric wheel being rotatably mounted in a transmission mechanism case and in power connection with a link mechanism, the link mechanism being in turn connected to a piston of a cylinder so that the power of the motor can be transmitted to the piston of the cylinder via the eccentric wheel and the link mechanism, so that the piston moves to compress a gas to impact a drill bit, thereby realizing the operation of the electric hammer.
However, the above-mentioned conventional transmission mechanism of the electric hammer has some disadvantages, and specifically, when the piston moves, a reaction force is applied to the eccentric wheel through the link mechanism, and the eccentric wheel unloads the reaction force to the shaft (or pin) on which the eccentric wheel is mounted, which easily causes the shaft (or pin) to break or loosen, and if the eccentric wheel unloads the reaction force to the transmission gear connected to the eccentric wheel, the gear may be subjected to tooth picking and tooth breaking phenomena, which undoubtedly affect the reliability and stability of the eccentric wheel, and thus the reliability and stability of the transmission mechanism of the electric hammer, and even the whole electric hammer, may be affected.
Disclosure of Invention
The first purpose of the invention is to provide a supporting structure of an eccentric wheel, which improves the stability and reliability of the eccentric wheel.
A second object of the invention is to provide a transmission mechanism comprising the supporting structure of the eccentric wheel provided by the invention.
A third object of the present invention is to provide a power tool using the transmission mechanism provided by the present invention.
In order to achieve the above object, the present invention provides a supporting structure for an eccentric wheel, the eccentric wheel being rotatably mounted on a machine body through an eccentric wheel mounting shaft, one end of the eccentric wheel being hinged to a driving member at a position on one side of an axis of the eccentric wheel, wherein the supporting structure for the eccentric wheel comprises a supporting member fixedly connected to the machine body, the supporting member being in contact with at least a half circumferential surface of the eccentric wheel away from the driving member, and the supporting member being in contact with a half circumferential surface of the eccentric wheel close to the driving member.
Preferably, the support member is in contact with an end circumferential surface of the eccentric adjacent to the driving member.
Preferably, the support member includes a contact surface contacting with a circumferential surface of the eccentric wheel, and the contact surface is an arc surface coinciding with the circumferential surface of the eccentric wheel.
Preferably, the support member is a support block disposed at one side of the eccentric wheel in a radial direction.
Preferably, the supporting member is an eccentric sleeve surrounding the outer side of the outer peripheral surface of the eccentric wheel, and the eccentric wheel is rotatably attached to the eccentric sleeve.
Preferably, both sides of the eccentric wheel sleeve are fixedly connected to the machine body through connecting rods.
Preferably, a protrusion abutting against and connected to the machine body is formed on one side of the eccentric wheel sleeve, and the protrusion is located on the outer side of the circumferential surface of the eccentric wheel, which is far away from the driving piece.
Preferably, the machine body is provided with mounting plates spaced from each other in pairs, and the support member is embedded between the mounting plates in pairs.
Preferably, the drive member is a link.
In addition, the invention also provides a transmission mechanism, wherein the transmission mechanism comprises a machine body, a cylinder connected to the machine body, an eccentric wheel rotatably mounted on the machine body through an eccentric wheel mounting shaft, and a supporting structure of the eccentric wheel, the eccentric wheel is corresponding to the supporting structure of the eccentric wheel, a driving part is hinged to a position of one end of the eccentric wheel, which is positioned on one side of the axis of the eccentric wheel, and the driving part is hinged to a piston of the cylinder.
In addition, the invention also provides an electric tool, wherein the electric tool comprises the transmission mechanism.
The supporting structure of the eccentric wheel has the following advantages:
since the supporting structure of the eccentric comprises a supporting member fixedly connected to the machine body, the supporting member is at least in contact with the circumferential surface of the eccentric departing from the driving member, and the supporting member is in contact with the half circumferential surface of the eccentric close to the driving member, when the driving member is driven to move by the rotation of the eccentric, the reaction force of the driving member on the eccentric can be unloaded to the supporting member (because the reaction force of the driving member is directed to the circumferential surface of the eccentric departing from the driving member, the supporting member is at least in contact with the circumferential surface of the eccentric far from the driving member and just can bear the reaction force, and the supporting member is in contact with the half circumferential surface of the eccentric close to the driving member because the reaction force of the driving member is mainly or substantially transmitted to the half circumferential surface of the eccentric close to the driving member), and the eccentric wheel mounting shaft can not be broken or loosened due to unloading (or most of the eccentric wheel mounting shaft is unloaded), and similarly, when the eccentric wheel is in transmission connection with the gear, the gear can not be knocked out or cracked. Therefore, the supporting structure of the eccentric wheel can improve the stability and the reliability of the eccentric wheel.
Drawings
FIG. 1 is a partial schematic view of a transmission mechanism according to an embodiment of the present invention;
fig. 2 is a partial plan view of a supporting structure of the eccentric wheel according to the first embodiment of the present invention;
FIG. 3 is a partial top view of a support structure for the eccentric according to the preferred embodiment of the present invention;
fig. 4 is a partial plan view of a supporting structure of an eccentric wheel according to a second embodiment of the present invention.
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 can be embodied in many different forms than those herein described and many modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 to 4, according to a first aspect of the present invention, there is provided a supporting structure of an eccentric, in which the eccentric 1 is rotatably mounted to a body 4 by means of an eccentric mounting shaft 2, a driving member 3 is hinged to a position of one end of the eccentric 1 on one side of an axis of the eccentric 1 (specifically, a first hinge pin 15 may be provided at a position of one end surface of the eccentric 1 on one side of the axis of the eccentric 1, the driving member 3 is rotatably mounted to the first hinge pin 15, and the first hinge pin 15 may be integrally formed with the eccentric 1 or inserted into the eccentric 1), wherein the supporting structure of the eccentric comprises a supporting member 5 fixedly connected to the body 4, the supporting member 5 is in contact with at least (in a radial direction of the eccentric 1) a circumferential surface of the eccentric 1 facing away from the driving member 3, and the supporting member 5 is in contact with (in an axial direction of the eccentric 1) a half circumferential surface of the eccentric 1, the upper half circumferential surface 6), wherein the supporting piece 5 is contacted on the half circumferential surface of the eccentric wheel 1 close to the driving piece 3 means that the supporting piece 5 can be contacted on a certain section circumferential surface or the whole half circumferential surface of the eccentric wheel 1 close to the driving piece 3 along the axial direction of the eccentric wheel 1.
Since, as mentioned above, the supporting structure of the eccentric comprises the supporting member 5 fixedly connected to the machine body 4, the supporting member 5 is in contact with at least the circumferential surface of the eccentric 1 facing away from the driving member 3, and the supporting member 5 is in contact with the half circumferential surface of the eccentric 1 facing away from the driving member 3, so that when the driving member 3 is driven by the rotational movement of the eccentric 1, the reaction force of the driving member 3 on the eccentric 1 can be relieved to the supporting member 5 (because the reaction force of the driving member 3 is directed towards the circumferential surface of the eccentric 1 facing away from the driving member 3, the supporting member 5 is in contact with at least the circumferential surface of the eccentric 1 facing away from the driving member 3 and can just bear this reaction force, and because the reaction force of the driving member 3 is mainly or substantially transmitted to the half circumferential surface of the eccentric 1 facing away from the driving member 3), without the eccentric mounting shaft 2 breaking or becoming loose as a result of being relieved (or mostly relieved) to the eccentric mounting shaft 2, and likewise without the gear 14 being able to undergo tooth-picking and tooth-chipping phenomena when the eccentric 1 is in driving connection with the gear 14 (the gear 14 can mesh with a corresponding toothing on the lower half-circumferential surface 7 of the eccentric 1, as seen in fig. 1). It is thus seen that the supporting structure of the eccentric improves the stability and reliability of the eccentric 1.
In order to provide a better support and ensure that no resistance is exerted on the rotational movement of the eccentric wheel 1 beyond a reasonable range, the support 5 may be made of a steel material with high surface finish, such as powder metallurgy, copper, and the invention is not limited thereto.
In fact, the reaction force of the driving member 3 is transmitted mainly or substantially to the peripheral surface of the eccentric 1 near the end of the half of the peripheral surface of said driving member 3, so that according to a preferred embodiment of the invention the support 5 is in contact with the peripheral surface of the eccentric 1 near the end of the driving member 3. As a specific embodiment, the end of the eccentric 1 close to the drive element 3 can be formed as a flange land 8, and the support element 5 can be in contact with the circumferential surface of the flange land 8 (the circumferential surface of the flange land 8 also belongs to a part of the upper half-circumferential surface 6 of the eccentric 1).
According to a preferred embodiment of the present invention, the support 5 includes a contact surface contacting the circumferential surface of the eccentric 1, the contact surface being an arc surface conforming to the circumferential surface of the eccentric 1. However, the invention is not limited thereto, and in principle it is also possible to arrange the contact surfaces as planes, which is also protected by the invention.
According to a first embodiment of the invention, the support 5 is a support block arranged on one radial side of the eccentric 1.
According to a second embodiment of the invention, the support 5 is an eccentric sleeve which surrounds the outer circumference of the eccentric 1 and to which the eccentric 1 is rotatably engaged. Specifically, both sides of the eccentric sleeve may be fixedly connected to the machine body 4 by connecting rods 17. One side of the eccentric sleeve can also be formed with a projection 9 which abuts against and is connected to the machine body 4, the projection 9 being located outside the circumferential surface of the eccentric 1 facing away from the drive 3.
According to an embodiment of the present invention, the machine body 4 is provided with the mounting plates 10 spaced from each other in pairs, and the support member 5 is inserted between the mounting plates 10 in pairs, specifically, the machine body 4 is provided with two mounting plates 10 in the up-down direction and two mounting plates 10 in the left-right direction, of course, it is also possible that the support member 5 is connected to the machine body 4 by interference press-fitting or fastening with a threaded fastener, and such a solution or similar alternatives will fall within the protection scope of the present invention. According to the preferred embodiment of the present invention, a clamping plate 11 clamped into the support 5 may be further disposed between the two mounting plates 10 in the left-right direction, so that the support 5 is more stably connected to the machine body 4.
The above-mentioned driving member 3 may be a connecting rod, and may be a connecting rod or a plurality of connecting rods combined with each other, and the connecting rod may be hinged to a slider-type structure (for example, the piston 13 of the cylinder 12, and specifically, the connecting rod may be hinged to the piston 13 through the second hinge pin 16), so that the eccentric 1, the connecting rod and the piston 13 of the cylinder 12 constitute a crank-slider mechanism to convert the rotation of the eccentric 1 into the linear motion of the piston 13.
Still referring to fig. 1, according to a second aspect of the present invention, there is also provided a transmission mechanism, wherein the transmission mechanism may include a body 4, a cylinder 12 connected to the body 4, an eccentric 1 rotatably mounted to the body 4 by an eccentric mounting shaft 2, and a supporting structure for the eccentric, the eccentric 1 being the eccentric 1 corresponding to the supporting structure for the eccentric, a driving member 3 being hinged to one end of the eccentric 1 at a position on the side of the axis of the eccentric 1, the driving member 3 being hinged to a piston 13 of the cylinder 12. The machine body 4 is a containing box body of the transmission mechanism.
According to a third aspect of the present invention, there is also provided an electric tool, wherein the electric tool includes the above-described transmission mechanism. The power tool may be an electric hammer, a pick, a reciprocating saw, or the like.
Obviously, the transmission mechanism and the electric tool have all the advantages of the supporting structure of the eccentric wheel.
The above description is only intended to represent the embodiments of the present invention, and the description is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. The utility model provides a bearing structure of eccentric wheel, the eccentric wheel passes through eccentric wheel installation axle and rotationally installs in the organism, the one end of eccentric wheel is located the position of the axis one side of eccentric wheel articulates there is the driving piece, a serial communication port, bearing structure of eccentric wheel include fixed connection in the support piece of organism, support piece at least with the eccentric wheel deviate from in the circumference surface contact of driving piece, just support piece contact in the eccentric wheel is close to on the half circumference surface of driving piece.
2. The eccentric support structure according to claim 1, wherein the supporting member is in contact with an end circumferential surface of the eccentric adjacent to the driving member.
3. The eccentric support structure according to claim 1, wherein the supporter comprises a contact surface contacting with a circumferential surface of the eccentric, the contact surface being an arc surface coinciding with the circumferential surface of the eccentric.
4. The eccentric wheel support structure according to any one of claims 1 to 3, wherein the support member is a support block provided on one side in a radial direction of the eccentric wheel.
5. The eccentric wheel support structure according to any one of claims 1 to 3, wherein the support member is an eccentric wheel housing that surrounds the outer peripheral surface of the eccentric wheel, and the eccentric wheel is rotatably fitted to the eccentric wheel housing.
6. The eccentric wheel support structure according to claim 5, wherein both sides of the eccentric wheel housing are fixedly connected to the machine body by connecting rods.
7. The eccentric support structure according to claim 5, wherein one side of the eccentric sleeve is formed with a projection abutting against and connected to the machine body, the projection being located on an outer side of a circumferential surface of the eccentric facing away from the driving member.
8. The eccentric wheel support structure according to any one of claims 1 to 3, wherein mounting plates are provided in pairs spaced apart from each other on the machine body, and the supporting member is fitted between the mounting plates in the pairs.
9. The eccentric wheel support structure according to any one of claims 1 to 3, wherein the driving member is a connecting rod.
10. A transmission mechanism, comprising a body, a cylinder connected to the body, an eccentric wheel rotatably mounted on the body by an eccentric wheel mounting shaft, and a supporting structure of the eccentric wheel according to any one of claims 1 to 9, wherein the eccentric wheel corresponds to the supporting structure of the eccentric wheel, a driving member is hinged to a position at one end of the eccentric wheel on one side of the axis of the eccentric wheel, and the driving member is hinged to a piston of the cylinder.
11. A power tool, characterized in that it comprises a transmission according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693968.0A CN109404514B (en) | 2017-08-14 | 2017-08-14 | Supporting structure of eccentric wheel, transmission mechanism and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693968.0A CN109404514B (en) | 2017-08-14 | 2017-08-14 | Supporting structure of eccentric wheel, transmission mechanism and electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404514A CN109404514A (en) | 2019-03-01 |
| CN109404514B true CN109404514B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710693968.0A Active CN109404514B (en) | 2017-08-14 | 2017-08-14 | Supporting structure of eccentric wheel, transmission mechanism and electric tool |
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| CN (1) | CN109404514B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201921949U (en) * | 2010-12-14 | 2011-08-10 | 东风汽车公司 | Structure capable of preventing fracture of connecting rod pin shaft of forge press machine tool |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3943782A (en) * | 1974-11-08 | 1976-03-16 | Skil Corporation | Power hammer |
| CN2614107Y (en) * | 2003-04-08 | 2004-05-05 | 江苏苏美达五金工具有限公司 | Electric tool with three-function knob |
| DE102006053105A1 (en) * | 2006-11-10 | 2008-05-15 | Robert Bosch Gmbh | Hand tools percussion device |
| DE102007000393A1 (en) * | 2007-07-19 | 2009-01-22 | Hilti Aktiengesellschaft | Hand tool with pneumatic percussion |
| CN103669130B (en) * | 2012-09-09 | 2016-01-06 | 蓬莱奥斯勃机械有限公司 | Portable internal combustion impact tamping pickaxe |
| CN104278600A (en) * | 2013-07-07 | 2015-01-14 | 蓬莱奥斯勃机械有限公司 | Portable grease lubrication impact packer |
| DE102013015061A1 (en) * | 2013-09-09 | 2015-03-12 | Hans-Erich Maul | Compact coaxial eccentric gear Drive of a hand-held electric or pneumatic device |
| CN103552041A (en) * | 2013-11-01 | 2014-02-05 | 王映辉 | Energy-storage catapult impact hammer |
| CN204976554U (en) * | 2015-09-18 | 2016-01-20 | 江苏科瑞工具制造有限公司 | Electric hammer, electric pick anti -channeling mechanism |
| CN204976551U (en) * | 2015-09-21 | 2016-01-20 | 浙江海王电器有限公司 | Multi -functional electric hammer of single button |
-
2017
- 2017-08-14 CN CN201710693968.0A patent/CN109404514B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201921949U (en) * | 2010-12-14 | 2011-08-10 | 东风汽车公司 | Structure capable of preventing fracture of connecting rod pin shaft of forge press machine tool |
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| CN109404514A (en) | 2019-03-01 |
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