CN218817976U

CN218817976U - Gear for speed reducer

Info

Publication number: CN218817976U
Application number: CN202223287213.6U
Authority: CN
Inventors: 高琼华
Original assignee: Sew Tianjin Transmission Equipment Co ltd
Current assignee: Sew Tianjin Transmission Equipment Co ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-04-07
Anticipated expiration: 2032-12-08

Abstract

The utility model relates to a gear for reduction gear, this gear includes roughly columniform base member (10), this base member has left end face (21) and right end face (22) of opposition, wherein, process out hole (12) that link up in base member (10), this hole that link up extends along axial direction (X), wherein, be formed with left chamfer region (31) on the transition portion between hole (12) and left end face (21), wherein, be formed with right chamfer region (32) on the transition portion between hole (12) and right end face (22). The left chamfer area (31) comprises at least one main section (41) having a convex cross section.

Description

Gear for speed reducer

Technical Field

The utility model relates to a gear for reduction gear, this gear include approximate columniform base member, and this base member has left end face and the right-hand member face of opposition, and wherein, process out the hole that link up in the base member, the hole that should link up extends along axial direction, and wherein, is formed with left chamfer region in the transition portion between hole and left end face, and wherein, is formed with right chamfer region in the transition portion between hole and right-hand member face.

The invention also relates to a method for manufacturing a gear according to the invention.

Background

The drive for the machine has an electric motor and a mechanical reduction gear. The motor drives the machine through a reducer. The reducer includes a plurality of gears disposed in a housing and engaged with each other. The housing comprises a plurality of housing parts which are connected to each other and enclose a cavity in which the gear is arranged. Here, the gear is positioned on a rotatable shaft.

A gear wheel of this type and a method for producing the gear wheel are known from the document DE 10 2011 109 A1. The gear includes a base body in which a through hole is machined. Chamfered regions are formed in the transitions between the bores and the end faces.

SUMMERY OF THE UTILITY MODEL

The object of the invention is to improve a gear for a reduction gear and to improve a method for producing a gear.

The object is achieved by a gear for a reduction gear having the following features.

According to the utility model discloses a gear for reduction gear includes roughly cylindrical base member, and this base member has left end face and the right-hand member face that opposes with the left end face, and wherein, the hole that link up is processed out in the base member, and this hole that link up extends along axial direction. Here, a left chamfered region is formed at a transition portion between the hole and the left end surface, and a right chamfered region is formed at a transition portion between the hole and the right end surface. The left chamfer area here comprises at least one main section with a convex cross section.

The assembly of the gear on the shaft is advantageously simplified by the design according to the invention. The convex cross section of the main section of the left chamfer area enables a smooth and precise positioning of the gear wheel on the shaft. Damage to the shaft, in particular scratches due to sharp edges on the bore of the gear, is avoided.

According to an advantageous embodiment of the invention, the main section of the left chamfer area has a sector-shaped cross section.

According to an advantageous embodiment of the invention, the main section of the left chamfer area has a cross section in the shape of an oval sector.

According to an advantageous further development of the invention, the right chamfer region comprises at least three sections which are formed differently from one another.

According to an advantageous development of the invention, the right chamfer area comprises at least one section with a sector-shaped or segment-shaped or oval sector-shaped cross section. Thus, the sections have a convex cross-section.

According to an advantageous further development of the invention, the right chamfer area comprises at least two sections having different angles of inclination relative to the axial direction. The two sections thus each have a linear cross section.

According to the utility model discloses an advantageous improvement, right chamfer is regional including: an outer section having an outer inclination angle of between 40 ° and 50 °, preferably 45 °, with respect to the axial direction; an intermediate section having a sector-shaped or oval sector-shaped cross section; an inner section having an inner inclination angle of between 25 ° and 35 °, preferably 30 °, with respect to the axial direction. The outer and inner sections each have a linear cross section. The intermediate section thus has a convex cross section.

According to a preferred embodiment of the invention, the left chamfer area and the right chamfer area are formed differently from one another.

A method for producing a gear according to the invention is also proposed, in which a through-hole is machined in an axial direction with a first diameter in a substantially cylindrical basic body having a left end face and an opposite right end face. A left chamfered area is formed on a transition portion between the hole and the left end surface, and a right chamfered area is formed on a transition portion between the hole and the right end surface. The left chamfer area here comprises at least one main section with a convex cross section.

According to the utility model discloses a preferred improvement scheme produces left auxiliary section in left chamfer is regional, produces right auxiliary section in right chamfer is regional, wherein, auxiliary section extends to second diameter department along radial direction. The through hole is then enlarged to a second diameter.

After the creation of the secondary section, the bore has a first diameter in the central region, which is smaller than the second diameter. To further manufacture the gear, a spindle (Dorn) is inserted in the hole to hold the matrix. The external toothing is then milled and ground. If necessary, further work steps are carried out. The mandrel is then removed from the hole in the base. The through hole is then enlarged to a second diameter.

According to an advantageous further development of the invention, the through-hole is enlarged to the second diameter by means of grinding. Subsequently, grooves extending in the axial direction are milled into the edge of the hole.

According to an advantageous embodiment of the invention, the auxiliary section has an angle of inclination of between 10 ° and 20 °, preferably 15 °, in each case with respect to the axial direction. The two auxiliary sections each have a linear cross section. The described design of the angle of inclination enables a smooth and precise positioning of the substrate on the mandrel.

The present invention is not limited to the above-described combinations of features. The above-described and/or individual features and/or other possible combinations of features described below and/or of features in the drawings can be brought about by a person skilled in the art, in particular from the object set out and/or by comparison with the prior art.

Drawings

The invention will now be described in detail with reference to the accompanying drawings. The invention is not limited to the embodiments shown in the drawings. The figures only schematically show the subject matter of the invention. The figures show that:

FIG. 1: a perspective view of the gear is shown,

FIG. 2: a cross-sectional view of the gear during manufacture is shown,

FIG. 3: an enlarged illustration of the left chamfered area in figure 2 is shown,

FIG. 4: an enlarged illustration of the right chamfered area in fig. 2 is shown.

List of reference numerals:

10 base body

12 holes

14 groove

21 left end face

22 right end face

31 left chamfered area

32 right chamfered area

41 main section

45 left auxiliary section

51 outer section

52 middle section

53 inner section

55 Right auxiliary section

A1 external inclination angle

A3 inner oblique angle

AH auxiliary Tilt Angle

D1 first diameter

D2 second diameter

M center axis

In the X axial direction

R radial direction

Detailed Description

Fig. 1 shows a perspective view of a gear. The gear comprises a substantially cylindrical base body 10. The base 10 has a left end face 21 and a right end face 22 opposed to the left end face 21. A through-hole 12 is machined in the base body 10. The gear wheel has an external toothing, which is milled into the basic body 10. The gear wheel meshes with another gear wheel in the reduction gear by means of a toothing.

The hole 12 machined in the basic body 10 extends in the axial direction X. A groove 14 is machined in the edge of the bore 12, which groove likewise extends in the axial direction X. In a reducer, gears are positioned on a rotatable shaft. Here, the shaft passes through the hole 12. The catch engages in the groove 14.

The end faces 21, 22 extend parallel to each other. The bore 12 extends at right angles to the end faces 21, 22. A left chamfered area 31 is formed at the transition between the bore 12 and the left end face 21. A right-angled region 32, which is covered in the illustration shown here, is formed at the transition between the bore 12 and the right end face 22.

Fig. 2 shows a cross-sectional view of a gear during manufacture. The hole 12 in the basic body 10 extends concentrically with the centre axis M. The central axis M extends in the axial direction X. The direction at right angles to the axial direction X is referred to as the radial direction R.

First, a through hole 12 is formed in the base 10 along the axial direction X with a first diameter D1. Subsequently, a left chamfered area 31 is formed on the transition between the hole 12 and the left end face 21, and a right chamfered area 32 is formed on the transition between the hole 12 and the right end face 22.

A left auxiliary section 45 is created in the left chamfered area 31. The left auxiliary section 45 extends in the radial direction R up to a second diameter D2. The left auxiliary section 45 has an auxiliary inclination angle AH of 15 ° with respect to the axial direction X. The second diameter D2 is greater than the first diameter D1. A main section 41 is also produced in the left chamfered area 31.

A right auxiliary section 55 is produced in the right chamfered area 32. The right auxiliary section 55 likewise extends in the radial direction R to a second diameter D2. The right auxiliary section 55 likewise has an auxiliary inclination angle AH of 15 ° with respect to the axial direction X.

In a later manufacturing step, the through-hole 12 is enlarged from the first diameter D1 to the second diameter D2 by means of a grinding process. Here, the left auxiliary section 45 of the left chamfered area 31 and the right auxiliary section 55 of the right chamfered area 32 are removed. However, the main section 41 of the left chamfered area 31 remains unchanged.

Fig. 3 shows an enlarged illustration of the left chamfered area 31 in fig. 2. The left chamfered area 31 includes a main section 41. The main section 41 is directly adjacent to the left end face 21. The main section 41 of the left chamfered area 31 has a sector-shaped cross section with a constant radius. The main section 41 thus has a convex cross section.

Temporarily, during manufacturing, the left chamfer area 31 additionally comprises a left auxiliary section 45. The left auxiliary section 45 is located between the main section 41 and the bore 12. The left auxiliary section 45 has a rectilinear cross section. After manufacture, when the left auxiliary section 45 is removed, the main section 41 directly adjoins the hole 12.

Fig. 4 shows an enlarged illustration of the right chamfered area in fig. 2. The right chamfered area 31 comprises an outer section 51, an intermediate section 52 and an inner section 53. The outer section 51 directly adjoins the right end face 22. The intermediate section 52 directly adjoins the outer section 51. The inner section 53 directly adjoins the middle section 52.

The outer section 51 has an outer inclination angle A1 of 45 ° with respect to the axial direction X. Thus, the outer section 51 has a rectilinear cross-section. The intermediate section 52 has a cross-section in the shape of a sector of constant radius. The midsection 52 thus has a convex cross-section. The inner section 53 has an inner inclination angle A3 of 30 ° with respect to the axial direction X. The inner section 53 thus has a rectilinear cross section.

During manufacture, the right chamfered area 32 additionally temporarily comprises a right auxiliary section 55. The right auxiliary section 55 is located between the inner section 53 and the bore 12. The right auxiliary section 55 has a linear cross-section. After manufacture, when the right auxiliary section 55 is removed, the inner section 53 directly abuts the hole 12.

Claims

1. A gear for a speed reducer, the gear comprising:

a substantially cylindrical base body (10) having a left end face (21) and an opposite right end face (22),

a through-hole (12) machined in the base body (10),

the bore extends in an axial direction (X),

a left chamfer area (31) is formed at the transition between the bore (12) and the left end face (21),

a right-angled region (32) is formed at the transition between the bore (12) and the right end face (22),

it is characterized in that the preparation method is characterized in that,

the left chamfer area (31) comprises at least one main section (41) having a convex cross section.

2. The gear for a speed reducer according to claim 1,

the main section (41) of the left chamfer area (31) has a sector-shaped cross section.

3. The gear for a speed reducer according to claim 1,

the main section (41) of the left chamfer area (31) has an oval sector-shaped cross section.

4. The gear for a speed reducer according to any one of claims 1 to 3,

the right chamfer area (32) comprises at least three sections (51, 52, 53) which are respectively formed differently from one another.

5. The gear for a speed reducer according to any one of claims 1 to 3,

the right chamfered area (32) comprises at least one section (52) having a sector-shaped cross section.

6. Gear for a reducer according to claim 5, characterised in that the right chamfered area (32) comprises at least one section (52) with a cross section in the shape of an elliptical sector.

7. The gear for a speed reducer according to any one of claims 1 to 3,

the right chamfer area (32) comprises at least two sections (51, 53) having mutually different inclination angles (A1, A3) with respect to the axial direction (X).

8. The gear for a speed reducer according to any one of claims 1 to 3,

the right chamfered region (32) includes:

an outer section (51) having an outer inclination angle (A1) between 40 ° and 50 ° with respect to the axial direction (X);

an intermediate section (52) having a sector-shaped or oval sector-shaped cross section;

an inner section (53) having an inner inclination angle (A3) between 25 ° and 35 ° with respect to the axial direction (X).

9. A gear wheel for a reducer according to claim 8, in which the angle of inclination (A1) is 45 °.

10. A gear wheel for a reducer according to claim 8, in which the internal inclination angle (A3) is 30 °.

11. Gear for a speed reducer according to any one of claims 1 to 3,

the left chamfer area (31) and the right chamfer area (32) are formed differently from each other.