WO2006108342A1

WO2006108342A1 - A grooved cam

Info

Publication number: WO2006108342A1
Application number: PCT/CN2006/000528
Authority: WO
Inventors: Liang Fang
Original assignee: Liang Fang
Priority date: 2005-04-11
Filing date: 2006-03-28
Publication date: 2006-10-19
Also published as: CN2781092Y

Abstract

A grooved cam includes an upper cam (3A), a lower cam (3B) and a bush (8), wherein one end of the upper cam (3A) and the lower cam (3B) is a plane which is perpendicular to the axis thereof and the other end is formed to a curved surface with a lift stroke and a return stroke. Moreover, the upper cam (3A) and the lower cam (3B) are inserted within the inner portion of the bush (8) from the two end of the bush, respectively, so that the highest point of the curved surface of the upper cam (3A) could be corresponding with the lowest point of the curved surface of the lower cam (3B). Therefore, there is a ring-shape closed inner groove between said curved surfaces of the upper cam and the lower cam and said inner portion of the bush (8), so as to form the lift stroke and the return stroke therein. Furthermore, said grooved cam according to the present invention has many advantages, such as high reliability, lower cost and simple process.

Description

A new type of inner groove cam technology field

The utility model relates to a novel inner groove cam, in particular to a novel inner groove cam for generating a linear motion output of a power tool. It belongs to the transformation technology of the inner groove. .

. Background technique

The mechanism that currently produces linear motion output is mainly the crank slider mechanism. Due to the large number of hinges, the rotating shaft is mostly a cantilever shaft, and its output characteristics are poorly commutated, so the processing cost is high and wear is easy, and the noise is large, and the balance slider is often required, resulting in a complicated structure.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inner groove cam that effectively changes the motion law, improves the 'work reliability, eliminates noise, and simplifies the machining process, thereby reducing the manufacturing cost, in consideration of the above problems. The schematic diagram of the utility model is shown in the drawing, and includes an upper cam (3 Α) and a lower cam (3 衬套 bushing (8), wherein one ends of the upper cam (3 Α) and the lower cam (3 Β) are perpendicular to the shaft The plane of the heart line, the other end is made into a working surface with lift and return stroke, and the upper cam ( ³ Α) and the lower cam UB are respectively inserted into the bushing (8) from the two ends of the bushing (8). The highest point of the cavity and the upper cam (3Α) working surface is opposite to the lowest point of the lower cam (3Β) working surface, and the working surfaces of the upper and lower cams and the inner surface of the bushing (8) are surrounded by the lift And returning - closing the inner ring groove. .

The upper cam (3 Α) and lower cam (·3 Β) working surfaces are envelope surfaces that change the acceleration of the follower by a sine gauge. : '·

The sum of the rise and return wrap angles of the upper cam (3Α) and the lower cam (3Β) is '360°, wherein the lift wrap angle is any element line on the lift surface in the inner groove cam structure. The angle of the circle corresponding to the obtained arc segment, the wrap angle of the return path is the center angle of the arc segment of the projection in the axial direction of the inner groove of the inner groove of the inner groove cam structure, and the return wrap angles may be equal or unequal. · ' The upper cam (3A) and the lower cam (3B) are radially distributed with more than one fixed position bump (3C) at one end of the plane, and the end faces of the bushing (8) correspond to the cam positioning protrusions (3C). There is a positioning notch (8A) in the position. '''

The sleeve (8) is provided with a positioning protrusion (8A) on the end surface of the bushing (8), and a positioning bump which is distributed in the radial direction of the upper cam (3A) and the lower cam (3B) at one end of the plane ( 3C) The dimensions are the same.

The utility model comprises an upper cam and a lower cam, wherein the upper cam and the lower cam respectively fit into the inner cavity of the bushing from the two ends of the bushing respectively, so that the working surface of the upper and lower cams and the inner cavity of the bushing The structure of the closed annular inner wheel groove having the lift and the return stroke can effectively change the activation law, improve the work reliability, eliminate the noise, and simplify the machining process, thereby reducing the manufacturing cost. The utility model has the advantages of convenient processing and simple assembly, and is an in-vehicle cam which is ingeniously designed and convenient and practical.

BRIEF DESCRIPTION OF THE DRAWINGS

■ Figure 1 is a schematic view of the structure of the present invention;

2 is a schematic structural view of a middle upper cam (3A) and a lower cam (3B) according to the present invention;

'Figure 3 is a top view of Figure 2;

Figure 4 is a schematic view of the structure of the bushing (8);

Figure 5 is a plan view of Figure 4;

Figure 6 is a schematic view showing the structure of the utility model applied to a power tool. .

• . detailed description .

Example: . . '

The structure of the utility model is shown in Figs. 1, 2, and 3, and includes an upper cam 3A, a lower cam 3B, and a bushing 8, wherein one ends of the upper cam 3.A and the lower cam 3B are perpendicular to the axial center. The plane of the line, 'the other end is made into a working surface having a lift and a return stroke, and the upper cam 3 and the lower cam 3B are respectively fitted into the inner cavity of the bushing 8 from both ends of the bushing 8, respectively, and the upper cam 3A works. The highest point of the curved surface is opposite to the lowest point of the working surface of the lower cam 3B, and the working surface of the upper and lower cams and the inner cavity of the bushing 8 are surrounded by lift and return The closed annular inner wheel groove, 'the outer diameter of the upper and lower cams are equal to the inner diameter of the bushing. In the present embodiment, the working surfaces of the upper cam 3A and the lower cam 3B are envelope surfaces that change the acceleration of the follower in a sinusoidal manner. '

The sum of the rise and return wrap angles of the upper cam 3A and the lower cam 3B described above is .360°. The lift wrap angle is the central angle corresponding to the arc segment projected on the lift axis in the axial direction of the inner groove cam structure, and the return wrap angle is any linear line on the return path surface. The central angle corresponding to the obtained arc segment is projected in the direction, and the rise and return wrap angles may be equal or unequal. In this embodiment, the elevation and return wrap angles of the working surface are both 180°. ■ ' .

In order to facilitate the installation and positioning, the upper cam 3A and the lower cam 3B are radially distributed with one or more positioning projections 3C at one end of the plane, and the end faces of the bushings 8 are provided with positioning notches 8A corresponding to the positions of the cam projections. As shown in Figures 4 and 5, the axial relative positions of the upper and lower cams are ensured by the corresponding positioning positions of the cam positioning projections and the bushings. The size of the positioning notch 8A provided at the end faces of the bushing 8 coincides with the size of the positioning cam 3C of the upper cam 3A and the lower cam 3B at the one end of the plane.

The utility model of the utility model is shown in Fig. 0, wherein the utility model and the solid, fixed shaft 2, the slider 4, the guide rod 5, the bearing bush 6, the frame 7 and the like constitute a reciprocating linear motion output device, wherein The inner cavity of the inner groove cam 3 is fitted on the outer cylindrical surface of the fixed shaft 2, and is rotatable around the fixed shaft 2. The bushing 8 is fitted on the outer wall of the inner groove cam 3, and the outer cylindrical side of the fixed shaft 1 is axially opened. There are two through slots 2Α', 2Β, one end of the fixed shaft 1 is mounted on the frame 7, 'and the hollow inner cavity of the end is equipped with a bearing bush 6 , and a through hole is arranged in the middle of the bearing bush 6 , and the slider 4 is fixed On the guide rod 5, the front end of the slider 4 is inserted into the inner wheel groove of the inner groove cam 3 through the fixed shaft 2 through groove 2, and the rear portion of the slider 4 passes through the through groove 2 of the fixed shaft 2, and The inner groove of the through groove 2 is axially slid, and the guide rod 5 is installed in the inner cavity of the fixed shaft 2 through the through hole provided in the middle of the bearing pad 6, and can slide axially along the through hole of the bearing pad 6. In this embodiment, the inner groove cam structure has a stroke of 25 mm, the inner hole diameter is 37 mm, the working surface has a lift and return wrap angle of 180°, and the outer diameter of the bushing is 5 _: 0 ram.

During operation, the motor drives the inner groove cam 3 through the gear system to rotate, and the fixed shaft 2 does not move. The working surface of the inner groove cam 3 pushes the guide rod 5 to reciprocate linear motion through the cylindrical surface on the slider 4, and the guiding action of the through hole of the fixed shaft 2 - the end bearing bush 6 and the through groove of the fixed shaft 2 axial section pass through the sliding The block limits the rotation of the guide rod 5, so the guide rod will be output in a reciprocating linear motion. As shown in Figure 6.

Claims

杈^ request

A new type of inner groove cam, comprising: an upper cam (3A), a lower cam (3B), and a bushing ( ⁸ ), wherein one ends of the upper cam A) and the lower cam B) are perpendicular to the axis The plane of the line,

'The other end is made into a working surface with lift and return. The upper cam (3A) and the lower cam (3B) are respectively inserted into the inner cavity of the bushing (8) from the two ends of the bushing (8), and the upper cam - (3A) The highest point of the working surface is opposite to the lowest point of the lower cam (3B) working surface, and the 'working surface of the upper and lower cams and the inner cavity of the bushing (8) enclose a closed ring with lift and return Inner wheel slot. ―

The inner groove cam according to claim 1, wherein said upper cam (3A) and lower cam (3B.) working surfaces are enveloping surfaces for causing the acceleration of the follower to be sinusoidally changed. '

The inner groove cam according to claim 1, wherein the sum of the rising and returning wrap angles of said upper cam (3A) and lower cam (3B) is 360°.

4. The inner groove cam according to claim 1 or 2 or 3, wherein the upper cam (3A) and the lower cam B) are radially distributed with one or more positioning projections (3C) at one end of the plane. The bushing (8) has a positioning notch (8A) at the end face corresponding to the cam positioning projection (3C).

5. The inner groove cam according to claim 1, wherein said bushing (8) has a positioning notch (8A) provided on both end faces thereof, and an upper cam (3A) and a lower cam (3B) The positioning bumps (3C) distributed radially at one end of the plane are uniform in size. . '