WO2021204053A1 - 一种冲击扳手的冲击接触面形状 - Google Patents

一种冲击扳手的冲击接触面形状 Download PDF

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Publication number
WO2021204053A1
WO2021204053A1 PCT/CN2021/084883 CN2021084883W WO2021204053A1 WO 2021204053 A1 WO2021204053 A1 WO 2021204053A1 CN 2021084883 W CN2021084883 W CN 2021084883W WO 2021204053 A1 WO2021204053 A1 WO 2021204053A1
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WO
WIPO (PCT)
Prior art keywords
impact
block
contact surface
contact
rotating shaft
Prior art date
Application number
PCT/CN2021/084883
Other languages
English (en)
French (fr)
Inventor
施照军
黄灿权
Original Assignee
施照军
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 施照军 filed Critical 施照军
Priority to US17/764,550 priority Critical patent/US20220399781A1/en
Publication of WO2021204053A1 publication Critical patent/WO2021204053A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/145—Hand-held machine tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/225—Detecting coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
    • H02K2211/03—Machines characterised by circuit boards, e.g. pcb

Definitions

  • the utility model relates to the technical field of electric tools, in particular to the shape of an impact contact surface of an impact wrench.
  • the existing impact contact surface is flat as shown in Figure 11 and Figure 11.
  • the contact area is small when the stopper and the lock block collide, resulting in insufficient kinetic energy transmission and mechanical
  • the efficiency is low, and the flat contact surfaces will produce local stress concentration when they collide with each other, resulting in uneven force on each part of the stop and lock, accelerating local wear, and even causing cracks or breaks in the stop and/or lock , Reduce the service life of the impact wrench.
  • the purpose of the utility model is to overcome the shortcomings of the prior art and provide an impact contact surface shape of an impact wrench.
  • the present utility model adopts the following technical solution: the impact contact surface shape of the impact wrench, the impact wrench includes a rotating shaft acting on the workpiece and sleeved on the rotating shaft and driving the rotating shaft A rotating impact block, one end of the rotating shaft is provided with at least one block that collides with the impact block, and at least one lock block that collides with the block is provided on the impact block;
  • the impact contact surface includes at least: A first contact surface located on the stop block and used for pressing contact with the lock block, and at least one second contact surface located on the lock block and pressing contact with the first contact surface, the The first contact surface and the second contact surface are in a circular arc shape or a cycloid shape that can be meshed with each other.
  • two first contact surfaces that are symmetrical to each other are formed on the stopper, and two first contact surfaces are formed between the two first contact surfaces to connect the two first contact surfaces.
  • the first transition surface is formed on the stopper.
  • two second contact surfaces that are symmetrical to each other are formed on the lock block, and two second contact surfaces are formed between the two second contact surfaces to connect the two second contact surfaces.
  • the second transition surface is formed on the lock block.
  • two stoppers are provided at one end of the rotating shaft, and the two stoppers are centrally symmetrical with respect to the central axis of the rotating shaft; the first transition surface is arcuate Shaped or curved surface.
  • two lock blocks are provided on the impact block, and the two lock blocks are center-symmetric with respect to the central axis of the impact block; the second transition surface It is curved or curved.
  • a first arc-shaped transition surface or a first curved transition surface is formed at the connection between the first contact surface and the rotating shaft.
  • the impact block includes a seat body and a connecting block formed on the seat body and connecting the two lock blocks.
  • the two lock blocks are connected to form a cavity for accommodating the stop block, the connecting block is arc-shaped or curved, and a second arc-shaped transition surface is formed at the connection with the second contact surface.
  • the second curved transition surface is formed at the connection with the second contact surface.
  • the rotating shaft includes a body that acts on the workpiece and a convex disk formed on the other end of the body and placed in the cavity, and the stopper is formed on the convex disk ,
  • the first arc-shaped transition surface or the first curved transition surface is formed at the junction of the convex plate and the stopper.
  • the first contact surface and the second contact surface are in the shape of a logarithmic spiral that can mesh with each other.
  • the rotating shaft is provided with a bottom plate for carrying the stopper, the bottom plate is located at one end of the rotating shaft, and the stopper is formed on the bottom plate.
  • the present utility model has the following beneficial effects:
  • the first contact surface on the stop block and the second contact surface on the lock block adopt a circular arc shape, a cycloid shape or a logarithmic spiral shape that can engage with each other, so that the first contact surface and the second contact surface When the second contact surface collides, the mutual contact area is the largest, which helps to evenly separate the force generated by the impact, prevents local contact stress concentration on the first contact surface and the second contact surface, thereby reducing the local area between the lock block and the stop block.
  • the second contact surface adopts arc shape, cycloid shape or logarithmic spiral shape, which can also reduce the timing angle A1 when the impact block is retracted and the lock block crosses the stop block, thereby enhancing the smoothness of operating the impact wrench.
  • the first contact surface and the second contact surface are basically in full meshing contact with the entire surface, the force generated by the impact block will be maximized and transmitted to the rotating shaft, thus improving the entire impact wrench
  • the first contact surface of the stopper and the second contact surface of the lock block are symmetrically arranged, so that the roots of the stopper and the lock block are larger, and the stress that can withstand is greater, ensuring that the stop The root does not break when the block hits the lock block.
  • each stop block and the lock block are provided with two symmetrical centers, and each stop block and the lock block are symmetrically provided with two first contact surfaces and second contact surfaces, therefore, the stop block and the lock block When the lock block contacts and impacts, one of the first contact surfaces on each stop block will press and impact with one of the second contact surfaces on each lock block, and the first contact surface and the second contact surface of the collision at the same time are both mutually.
  • the center is symmetrical.
  • the mutual impact of the first contact surface and the second contact surface will cause the shaft core of the rotating shaft and the shaft core of the impact block to align and overlap, and then play the role of "center adjustment” to ensure The coaxiality between the rotating shaft and the impact block does not change, thereby further improving the mechanical efficiency of the impact wrench.
  • Figure 1 is a top view of the first embodiment of the utility model
  • Figure 2 is an exploded view of the first embodiment of the utility model
  • Figure 3 is a schematic diagram of the swing of the timing angle A1 in the utility model
  • Figure 4 is an exploded view of the second embodiment of the utility model
  • Figure 5 is a top view of the second embodiment of the utility model
  • Figure 6 is a schematic diagram of the contact surface of the second embodiment of the present utility model in a state where the contact surface is attached;
  • Figure 7 is an exploded view of the third embodiment of the utility model
  • Figure 8 is a top view of the third embodiment of the utility model
  • Fig. 9 is a schematic diagram of the contact surface of the third embodiment of the present invention in a state where the contact surface is attached.
  • Figure 10 is a comparison diagram of the arc shape, the cycloid shape and the logarithmic spiral shape of the utility model
  • Figure 11 is the first example of the prior art of the utility model
  • Figure 12 is the second example of the prior art of the utility model.
  • Figure 1 and Figure 10 show the shape of the impact contact surface of an impact wrench, wherein the impact wrench includes a rotating shaft 1 acting on a workpiece and sleeved on the rotating shaft 1 and driving the rotating shaft 1
  • the impact wrench includes a rotating shaft 1 acting on a workpiece and sleeved on the rotating shaft 1 and driving the rotating shaft 1
  • the impact contact surface includes: at least one first contact surface 31 located on the stop block 3 and used for pressing contact with the lock block 4, and at least one first contact surface 31 located on the lock block 4 and connected to the lock block 4
  • the first contact surface 31 press-contacts the second contact surface 41, and the first contact surface 31 and the second contact surface 41 are in a circular arc shape, a cycloid shape, or a logarithmic spiral shape that can engage with each other.
  • Two mutually symmetrical first contact surfaces 31 are formed on the stopper 3, and a first transition surface connecting the two first contact surfaces 31 is formed between the two first contact surfaces 31 32.
  • Two symmetrically arranged first contact surfaces 31 and first transition surfaces 32 form a circular arc tooth-shaped or cycloid tooth-shaped stopper 3.
  • the first contact surface 31 of the stop 3 is symmetrically arranged so that the root of the stop 3 is larger and the top is smaller, which not only can withstand greater stress, and ensures that the root does not occur when the stop 3 collides with the lock 4 Breaking can also reduce the weight of the stopper 3 itself, save material, and reduce the moment of inertia.
  • Two mutually symmetrical second contact surfaces 41 are formed on the lock block 4, and a second transition surface connecting the two second contact surfaces 41 is formed between the two second contact surfaces 41 42.
  • Two symmetrically arranged second contact surfaces 41 and second transition surfaces 42 constitute a lock block 4 with a circular arc tooth shape or a cycloid tooth shape.
  • the second contact surface 41 of the lock block 4 is symmetrically arranged, so that the root of the lock block 4 is larger and the top is smaller, which not only can withstand greater stress, and ensures that the root does not occur when the lock block 4 collides with the stop block 3
  • the fracture can also reduce the weight of the lock block 4 itself, save material, and reduce the moment of inertia.
  • the first contact surface 31 and the second contact surface 41 are both circular arc shapes, which are compared with the traditional flat impact contact surface (as shown in the figure). 11), the use of arc-shaped contact surfaces between the stop block 3 and the lock block 4 can make the cross section of the stop block 3 and the lock block 4 gradually decrease from the root to the top.
  • the timing angle A1 is equal to the timing angle A0, In the utility model, the roots of the stop block 3 and the lock block 4 are larger, and the force that can be withstood is also larger.
  • the first contact surface 31 and the second contact surface 41 both adopt a cycloid shape, and the cycloid is divided into the following two situations:
  • R 1 base radius; r a - the exterior rolling circle radius; r b - the rolling circle.
  • R 1 11.1mm
  • r a 300.0mm
  • the conventional flat contact surface impact comparator (11) the locking member 3 and the block 4 using the contact trochoidal surface, such that The cross-sections of the stop 3 and the lock 4 gradually decrease from the root to the top.
  • the timing angle A1 is equal to the timing angle A0
  • the roots of the stop 3 and the lock 4 in the present invention are larger and can bear more force. Big.
  • the first contact surface 31 and the second contact surface 41 both adopt a logarithmic spiral shape, and the equation of the logarithmic spiral is as follows:
  • r 0 7mm
  • k tan (40°).
  • the stop block 3 and the lock block 4 are contacted in a logarithmic spiral line.
  • the cross section of the stop block 3 and the lock block 4 gradually decreases from the root to the top.
  • the timing angle A1 is equal to the timing angle A0
  • the roots of the stop block 3 and the lock block 4 in the present invention are larger and can bear The force is also greater.
  • the use of logarithmic spiral also has the following characteristics:
  • the logarithmic spiral has shape retention
  • One end of the rotating shaft 1 is provided with two stoppers 3, and the two stoppers 3 are centrally symmetrical with respect to the central axis of the rotating shaft 1;
  • the first transition surface 32 is arc-shaped or curved noodle.
  • the impact block 2 is provided with two lock blocks 4, and the two lock blocks 4 are center-symmetric with respect to the central axis of the impact block 2;
  • the second transition surface 42 is an arc-shaped surface Or curved surface.
  • a first arc-shaped transition surface or a first curved transition surface 33 is formed at the connection between the first contact surface 31 and the rotating shaft 1.
  • the impact block 2 includes a seat body 21 and a connecting block 22 formed on the seat body 21 and connected to the two lock blocks 4.
  • the lock block 4 is connected to form a cavity 23 for accommodating the stop block 3
  • the connecting block 22 is arc-shaped or curved, and a second arc-shaped transition surface is formed at the junction with the second contact surface 41 Or the second curved transition surface 24. Setting the connection between the connecting block 22 and the second contact surface 41 as a second arc-shaped transition surface or a second curved transition surface 24 can avoid stress concentration when the shaft 1 collides with the impact block 2, and prevent cracks or cracks in the connection. Fracture, increase the service life of the impact block 2.
  • the rotating shaft 1 includes a body 11 that acts on a workpiece and a convex plate 12 formed on the other end of the body 11 and placed in the cavity 23.
  • the stopper 3 is formed on the convex plate 12,
  • the first arc-shaped transition surface or the first curved transition surface 33 is formed at the junction of the convex disk 12 and the stop block 3.
  • the connection between the first contact surface 31 and the convex plate 1 is set as a first arc-shaped transition surface or a first curved transition surface 33, which can avoid stress concentration when the shaft 1 collides with the impact block 2, and prevent cracks or cracks in the connection. Fracture, increase the service life of the shaft 1.
  • the rotating shaft 1 is provided with a bottom plate 13 for supporting the stop block 3, the bottom plate 13 is located at one end of the rotating shaft 1, and the stop block 3 is formed on the bottom plate 13.
  • the impact block 2 rotates clockwise to hit the shaft 1, so that the shaft 1 rotates.
  • the second contact surface 41 in the lock block 4 It collides with the first contact surface 31 in the stopper 3 to generate thrust, which pushes the rotating shaft 1 to rotate once, because the first contact surface 31 and the second contact surface 41 adopt mutually meshing and matching arc shapes or cycloid shapes or logarithmic spirals.
  • the contact area is the largest, which is beneficial to the uniform separation of the force generated by the collision, and prevents local contact stress on the first contact surface 31 and the second contact surface 41 Concentration, thereby reducing the local contact stress between the lock block 4 and the stop block 3, reduce the wear of the lock block 4 and the stop block 3, and increase the service life of the shaft 1 and the impact block 2.
  • the local contact stress between the stop block 3 and the second contact surface 41 on the lock block 4 adopt a circular arc or cycloid logarithmic spiral shape, and the impact block 2 can be retracted and locked.
  • the timing angle A1 is reduced, thereby enhancing the smoothness of operating the impact wrench; at the same time, since the first contact surface 31 and the second contact surface 41 are in contact with each other, basically the entire surface is in full meshing contact. , The force generated by the impact block 2 will be maximized to the shaft 1, thus improving the mechanical efficiency of the entire impact wrench; secondly, because the stop block 3 and the lock block 4 are both centrally symmetrically arranged with two blocks, and each block Both the block 3 and the lock block 4 are symmetrically provided with two first contact surfaces 31 and a second contact surface 41.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

一种冲击扳手的冲击接触面形状，冲击扳手包括有作用于工件上的转轴及套设于转轴上并带动转轴转动的冲击块，转轴一端至少设置一块与冲击块碰撞的挡块，冲击块上至少设置有一块与挡块相碰撞的锁块；冲击接触面包括：至少一个位于挡块上并用于与锁块抵压接触的第一接触面及至少一个位于锁块上并与第一接触面抵压的第二接触面，第一接触面和第二接触面呈可相互啮合的圆弧形状或摆线形状。将挡块的第一接触面和锁块的第二接触面采用可相互啮合的圆弧形或摆线形，使得碰撞时接触的面积最大，防止第一接触面和第二接触面上局部接应力集中，从而减少锁块与挡块之间的局部接触应力，减少锁块和挡块的磨损，增加转轴和冲击块的使用寿命。

Description

一种冲击扳手的冲击接触面形状 技术领域
本实用新型涉及电动工具技术领域，特指一种冲击扳手的冲击接触面形状。
背景技术
目前市面上，现有的冲击接触面如图11和图11所示为扁平状，而具有这种扁平的接触表面，在挡块与锁块撞击时接触面积较小，导致动能传递不足，机械效率低，并且扁平状的接触面在相互撞击时会产生局部应力集中，导致挡块和锁块的各部分受力不均，加速局部磨损，甚至造成挡块和/或锁块出现裂痕或断裂，降低了冲击扳手的使用寿命。
有鉴于此，本发明人提出以下技术方案。
实用新型内容：
本实用新型的目的在于克服现有技术的不足，提供一种冲击扳手的冲击接触面形状。
为了解决上述技术问题，本实用新型采用了下述技术方案：该冲击扳手的冲击接触面形状，所述冲击扳手包括有作用于工件上的转轴及套设于所述转轴上并带动所述转轴转动的冲击块，所述转轴一端至少设置一块与所述冲击块碰撞的挡块，所述冲击块上至少设置有一块与所述挡块相碰撞的锁块；所述冲击接触面包括：至少一个位于所述挡块上并用于与所述锁块抵压接触的第一接触面及至少一个位于所述锁块上并与所述第一接触面抵压接触的第二接触面，所述第一接触面和所述第二接触面呈可相互啮合的圆弧形状或摆线形状。
进一步而言，上述技术方案中，所述挡块上成型有两个相互对称的所述第一接触面，且两个所述第一接触面之间成型有连接两个所述第一接触面的第一过渡 面。
进一步而言，上述技术方案中，所述锁块上成型有两个相互对称的所述第二接触面，且两个所述第二接触面之间成型有连接两个所述第二接触面的第二过渡面。
进一步而言，上述技术方案中，所述转轴的一端设置有两个所述挡块，且两个所述挡块相对于所述转轴的中心轴呈中心对称；所述第一过渡面呈弧形面或弯曲面。
进一步而言，上述技术方案中，所述冲击块上设置有两个所述锁块，且两个所述锁块相对于所述冲击块的中心轴中呈心对称；所述第二过渡面呈弧形面或弯曲面。
进一步而言，上述技术方案中，所述第一接触面与所述转轴的连接处成型有第一弧形过渡面或第一弯曲过渡面。
进一步而言，上述技术方案中，所述冲击块包括有座体及成型于所述座体上并连接两个所述锁块的连接块，所述连接块对称设置有两个，并与两个所述锁块连接形成用于容纳所述挡块的腔体，所述连接块呈弧形或弯曲状，且在与所述第二接触面的连接处成型有第二弧形过渡面或第二弯曲过渡面。
进一步而言，上述技术方案中，所述转轴包括有作用于工件上的本体及成型于所述本体另一端并置于所述腔体内的凸盘，所述挡块成型于所述凸盘上，所述第一弧形过渡面或第一弯曲过渡面成型于所述凸盘与所述挡块连接处。
进一步而言，上述技术方案中，所述第一接触面和所述第二接触面呈可相互啮合的对数螺旋线形状。
进一步而言，上述技术方案中，所述转轴设置有用于承载所述挡块的底板(， 该底板位于所述转轴的一端，所述挡块成型于该底板上。
采用上述技术方案后，本实用新型与现有技术相比较具有如下有益效果：
1、本实用新型中通过将挡块上的第一接触面和锁块上的第二接触面采用可相互啮合的圆弧形或摆线形或对数螺旋线形，从而使得在第一接触面和第二接触面碰撞时相互接触的面积最大，有利于将撞击产生的作用力均匀分开，防止第一接触面和第二接触面上局部接应力集中，从而减少锁块与挡块之间的局部接触应力，减少锁块和挡块的磨损，增加转轴和冲击块的使用寿命，除了减少挡块与锁块之间的局部接触应力，将挡块上的第一接触面与锁块上的第二接触面采用圆弧形或摆线形或对数螺旋线形，还能在冲击块在缩回且锁块越过挡块的过程中减少定时角A1，从而增强了操作冲击扳手的光滑性。
2、本实用新型中由于第一接触面与第二接触面之间接触时基本上是整个面完全啮合接触，冲击块产生的作用力会最大化的传递给转轴，因而，提高了整个冲击扳手的机械效率；其次，将挡块的第一接触面和锁块的第二接触面均采用对称式设置，使得挡块和锁块的根部较大，能够承受的应力也更大，保证在挡块与锁块撞击时根部不发生断裂。
3、本实用新型中由于挡块与锁块均中心对称设置有两块，且每块挡块和锁块上均对称设置两个第一接触面和第二接触面，因此，在挡块与锁块接触撞击时，每个挡块上的其中一个第一接触面会与每个锁块上的其中一个第二接触面抵压撞击，且同时撞击的第一接触面和第二接触面均相互中心对称，所以，在冲击扳手工作时，第一接触 面和第二接触面的相互撞击会使转轴的轴芯与冲击块的轴芯产生对齐重合，进而起到“中心调整”的作用，保证转轴与冲击块之间的同轴度不发生改变，从而进一步提高冲击扳手的机械效率。
附图说明：
图1是本实用新型中实施例一的俯视图；
图2是本实用新型中实施例一的分解图；
图3是本实用新型中定时角A1的摆动示意图；
图4是本实用新型中实施例二的分解图；
图5是本实用新型中实施例二的俯视图；
图6是本实用新型中实施例二的接触面贴合状态示意图；
图7是本实用新型中实施例三的分解图；
图8是本实用新型中实施例三的俯视图；
图9是本实用新型中实施例三的接触面贴合状态示意图。
图10是本实用新型中圆弧形状与摆线形状与对数螺旋线形状的比较图；
图11是本实用新型的现有技术示例图一；
图12是本实用新型的现有技术示例图二。
附图标记说明：
1转轴                11本体                12凸盘
2冲击块              21座体                22连接块
23腔体               24第二弯曲过渡面      3挡块
31第一接触面         32第一过渡面          33第一弯曲过渡面
4锁块                41第二接触面          42第二过渡面
具体实施方式：
下面结合具体实施例和附图对本实用新型进一步说明。
中国专利申请号为201721655062.1的全部内容引入作为参考，其详细公开了冲击扳手的具体结构，以及冲击扳手的具体操作。但是，如本实用新型的内容所述，冲击扳手中转轴与冲击块的接触面形状不同。
见图1和图10所示，为一种冲击扳手的冲击接触面形状，其中，所述冲击扳手包括有作用于工件上的转轴1及套设于所述转轴1上并带动所述转轴1转动的冲击块2，所述转轴1一端至少设置一块与所述冲击块2碰撞的挡块3，所述冲击块2上至少设置有一块与所述挡块3相碰撞的锁块4；其特征在于，所述冲击接触面包括：至少一个位于所述挡块3上并用于与所述锁块4抵压接触的第一接触面31及至少一个位于所述锁块4上并与所述第一接触面31抵压接触的第二接触面41，所述第一接触面31和所述第二接触面41呈可相互啮合的圆弧形状或摆线形状或对数螺旋线形状。
所述挡块3上成型有两个相互对称的所述第一接触面31，且两个所述第一接触面31之间成型有连接两个所述第一接触面31的第一过渡面32。由两个对称设置的第一接触面31和第一过渡面32组成圆弧齿形或摆线齿形的挡块3。将挡块3的第一接触面31采用对称式设置，使得挡块3的根部较大顶部较小，不仅能够承受的应力也更大，保证在挡块3与锁块4撞击时根部不发生断裂，同时也能减轻挡块3自身的重量，节省材料，减少惯性力矩。
所述锁块4上成型有两个相互对称的所述第二接触面41，且两个所述第二接触面41之间成型有连接两个所述第二接触面41的第二过渡面42。由两个对称设置的第二接触面41和第二过渡面42组成圆弧齿形或摆线齿形的锁块4。将 锁块4的第二接触面41采用对称式设置，使得锁块4的根部较大顶部较小，不仅能够承受的应力也更大，保证在锁块4与挡块3撞击时根部不发生断裂，同时也能减轻锁块4自身的重量，节省材料，减少惯性力矩。
见图1至图3所示，为本实用新型实施例一，所述第一接触面31和所述第二接触面41均采用圆弧形状，与传统的扁平状冲击接触面相比较(如图11所示)，将挡块3和锁块4采用圆弧形接触面，可以使得挡块3和锁块4的横截面从根部到顶部逐渐减少，在定时角A1等于定时角A0的时，本实用新型中挡块3和锁块4的根部更大，所能承受的力也更大。
见图4至图6所示，为本实用新型实施例二，所述第一接触面31和所述第二接触面41均采用摆线形状，其中，摆线分为以下两种情况：
外摆线：
Figure PCTCN2021084883-appb-000001
内摆线：
Figure PCTCN2021084883-appb-000002
其中，R 1——基圆半径；r a——外滚圆半径；r b——内滚圆半径。
在本实施例中，R 1＝11.1mm，r a＝300.0mm，与传统的扁平状冲击接触面相比较(如图11所示)，将挡块3和锁块4采用摆线形接触面，使得挡块3和锁块4的横截面从根部到顶部逐渐减少，在定时角A1等于定时角A0的时，本实用新型中挡块3和锁块4的根部更大，所能承受的力也更大。
见图7至图9所示，为本实用新型实施例三，所述第一接触面31和所述第二接触面41均采用对数螺旋线形状，其中，对数螺旋线的方程式如下：
Figure PCTCN2021084883-appb-000003
其中，r 0——起始极径；θ——极角；r——极径。
在本实施例中，r 0＝7mm，k＝tan(40°)，与传统的扁平状冲击接触面相比较(如图11所示)，将挡块3和锁块4采用对数螺旋线形接触面，使得挡块3和锁块4的横截面从根部到顶部逐渐减少，在定时角A1等于定时角A0的时，本实用新型中挡块3和锁块4的根部更大，所能承受的力也更大。其次，采用对数螺旋线还具有一下特点：
1、同一条螺旋线上个点的螺旋角处处相等，压力角也处处相等；
2、对数螺旋线和它的等距曲线全等；
3、对数螺旋线具有保形性，
Figure PCTCN2021084883-appb-000004
4、光滑性(曲线光滑，无奇异点)；
5、不干涉性；
6、连续性。
所述转轴1的一端设置有两个所述挡块3，且两个所述挡块3相对于所述转轴1的中心轴呈中心对称；所述第一过渡面32呈弧形面或弯曲面。所述冲击块2上设置有两个所述锁块4，且两个所述锁块4相对于所述冲击块2的中心轴中呈心对称；所述第二过渡面42呈弧形面或弯曲面。通过将第一过渡面32和第二过渡面42采用弧形或弯曲形，能够避免在转轴1与冲击块2撞击时产生应力集中，防止过渡面产生裂纹，并且能够使得挡块3与锁块4在撞击过程中和分离过程中接触平滑，减少摩擦损耗，提高冲击扳手的光滑性。
所述第一接触面31与所述转轴1的连接处成型有第一弧形过渡面或第一弯 曲过渡面33。
所述冲击块2包括有座体21及成型于所述座体21上并连接两个所述锁块4的连接块22，所述连接块22对称设置有两个，并与两个所述锁块4连接形成用于容纳所述挡块3的腔体23，所述连接块22呈弧形或弯曲状，且在与所述第二接触面41连接处成型有第二弧形过渡面或第二弯曲过渡面24。将连接块22与第二接触面41的连接处设置成第二弧形过渡面或第二弯曲过渡面24，能够避免在转轴1与冲击块2撞击时产生应力集中，防止连接处产生裂纹或者断裂，提高冲击块2的使用寿命。
所述转轴1包括有作用于工件上的本体11及成型于所述本体11另一端并置于所述腔体23内的凸盘12，所述挡块3成型于所述凸盘12上，所述第一弧形过渡面或第一弯曲过渡面33成型于所述凸盘12与所述挡块3连接处。将第一接触面31与凸盘1的连接处设置成第一弧形过渡面或第一弯曲过渡面33，能够避免在转轴1与冲击块2撞击时产生应力集中，防止连接处产生裂纹或者断裂，提高转轴1的使用寿命。
所述转轴1设置有用于承载所述挡块3的底板13，该底板13位于所述转轴1的一端，所述挡块3成型于该底板13上。
综上所述，在一实施例中，本实用新型使用时，由冲击块2顺时针转动去撞击转轴1，使转轴1发生转动，在撞击过程中，锁块4中的第二接触面41与挡块3中的第一接触面31碰撞产生推力，推动转轴1转动一次，由于第一接触面31和第二接触面41采用的是相互啮合匹配的圆弧形或者摆线形或对数螺旋线形，因此，当第一接触面31和第二接触面41碰撞时相互接触的面积最大，有利于撞击产生的作用力均匀分开，防止第一接触面31和第二接触面41上局部接应 力集中，从而减少锁块4与挡块3之间的局部接触应力，减少锁块4和挡块3的磨损，增加转轴1和冲击块2的使用寿命；除了减少挡块3与锁块4之间的局部接触应力，将挡块3上的第一接触面31与锁块4上的第二接触面41采用圆弧形或摆线形对数螺旋线形，还能在冲击块2缩回且锁块4越过挡块3的过程中减少定时角A1，从而增强了操作冲击扳手的光滑性；同时，由于第一接触面31与第二接触面41之间接触时基本上是整个面完全啮合接触，冲击块2产生的作用力会最大化的传递给转轴1，因而，提高了整个冲击扳手的机械效率；其次，由于挡块3与锁块4均中心对称设置有两块，且每块挡块3和锁块4上均对称设置两个第一接触面31和第二接触面41，因此，在挡块3与锁块4接触撞击时，每个挡块2上的其中一个第一接触面31会与每个锁块4上的其中一个第二接触面41抵压撞击，且同时撞击的第一接触面31和第二接触面41均相互中心对称，所以，在冲击扳手工作时，第一接触面31和第二接触面41的相互撞击会使转轴1的轴芯与冲击块2的轴芯产生对齐重合，进而起到“中心调整”的作用，保证转轴1与冲击块2之间的同轴度不发生改变，从而进一步提高冲击扳手的机械效率。
当然，以上所述仅为本实用新型的具体实施例而已，并非来限制本实用新型实施范围，凡依本实用新型申请专利范围所述构造、特征及原理所做的等效变化或修饰，均应包括于本实用新型申请专利范围内。

Claims (10)

  1. 一种冲击扳手的冲击接触面形状，所述冲击扳手包括有作用于工件上的转轴(1)及套设于所述转轴(1)上并带动所述转轴(1)转动的冲击块(2)，所述转轴(1)一端至少设置一块与所述冲击块(2)碰撞的挡块(3)，所述冲击块(2)上至少设置有一块与所述挡块(3)相碰撞的锁块(4)；其特征在于，所述冲击接触面包括：至少一个位于所述挡块(3)上并用于与所述锁块(4)抵压接触的第一接触面(31)及至少一个位于所述锁块(4)上并与所述第一接触面(31)抵压接触的第二接触面(41)，所述第一接触面(31)和所述第二接触面(41)呈可相互啮合的圆弧形状或摆线形状。
  2. 根据权利要求1所述的一种冲击扳手的冲击接触面形状，其特征在于：所述挡块(3)上成型有两个相互对称的所述第一接触面(31)，且两个所述第一接触面(31)之间成型有连接两个所述第一接触面(31)的第一过渡面(32)。
  3. 根据权利要求1所述的一种冲击扳手的冲击接触面形状，其特征在于：所述锁块(4)上成型有两个相互对称的所述第二接触面(41)，且两个所述第二接触面(41)之间成型有连接两个所述第二接触面(41)的第二过渡面(42)。
  4. 根据权利要求2所述的一种冲击扳手的冲击接触面形状，其特征在于：所述转轴(1)的一端设置有两个所述挡块(3)，且两个所述挡块(3)相对于所述转轴(1)的中心轴呈中心对称；所述第一过渡面(32)呈弧形面或弯曲面。
  5. 根据权利要求3所述的一种冲击扳手的冲击接触面形状，其特征在于：所述冲击块(2)上设置有两个所述锁块(4)，且两个所述锁块(4)相对于所述冲击块(2)的中心轴中呈心对称；所述第二过渡面(42)呈弧形面或弯曲面。
  6. 根据权利要求4所述的一种冲击扳手的冲击接触面形状，其特征在于：所述第一接触面(31)与所述转轴(1)的连接处成型有第一弧形过渡面或第一 弯曲过渡面(33)。
  7. 根据权利要求5所述的一种冲击扳手的冲击接触面形状，其特征在于：所述冲击块(2)包括有座体(21)及成型于所述座体(21)上并连接两个所述锁块(4)的连接块(22)，所述连接块(22)对称设置有两个，并与两个所述锁块(4)连接形成用于容纳所述挡块(3)的腔体(23)，所述连接块(22)呈弧形或弯曲状，且在与所述第二接触面(41)的连接处成型有第二弧形过渡面或第二弯曲过渡面(24)。
  8. 根据权利要求6所述的一种冲击扳手的冲击接触面形状，其特征在于：所述转轴(1)包括有作用于工件上的本体(11)及成型于所述本体(11)另一端并置于所述腔体(23)内的凸盘(12)，所述挡块(3)成型于所述凸盘(12)上，所述第一弧形过渡面或第一弯曲过渡面(33)成型于所述凸盘(12)与所述挡块(3)连接处。
  9. 根据权利要求1-8任意一项所述的一种冲击扳手的冲击接触面形状，其特征在于：所述第一接触面(31)和所述第二接触面(41)呈可相互啮合的对数螺旋线形状。
  10. 根据权利要求9所述的一种冲击扳手的冲击接触面形状，其特征在于：所述转轴(1)设置有用于承载所述挡块(3)的底板(13)，该底板(13)位于所述转轴(1)的一端，所述挡块(3)成型于该底板(13)上。
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