CN115625384A - A sun gear assembly cutting structure - Google Patents

Abstract

The invention discloses a sun gear assembly cutting structure, which includes a sun gear and a connecting shaft; the sun gear includes a gear body and a wheel shaft coaxially connected with the gear body, and the wheel shaft is sequentially provided with external splines along the direction away from the gear body , the ring groove and the guide section, the wall surface of the ring groove and the external spline and the joint of the external spline form a sharp cutting part; the connecting shaft is provided with a connecting sleeve for connecting the wheel shaft; when the wheel shaft of the sun gear and the connecting shaft When the connecting sleeve is connected, the guide section, ring groove and external spline of the axle are inserted into the connecting sleeve in sequence, and the cutting part of the axle cuts the inner wall of the connecting sleeve so that the inner wall of the connecting sleeve forms an internal spline meshing with the external spline. The invention can prevent the expansion and deformation of the connecting sleeve when the wheel shaft is installed into the connecting sleeve, prevent the wheel shaft from being deformed under excessive pressure, and at the same time ensure that the outer splines of the wheel shaft are tightly meshed with the inner splines of the connecting sleeve.

Description

A sun gear assembly cutting structure

technical field

The invention relates to the field of planetary reducers, in particular to a sun gear assembly cutting structure.

Background technique

In the structural design of the existing planetary reducer, the sun gear and the connecting shaft used to connect the motor are matched through splines, wherein the shaft of the sun gear is provided with external splines, and the inner wall of the connecting sleeve of the connecting shaft is provided with internal splines. The axle is inserted into the coupling sleeve and the external splines are engaged with the internal splines.

At present, the connecting sleeve of the sun gear shaft and the connecting shaft adopts an interference fit design structure, which has the following problems:

1. When the sun gear shaft and the connecting sleeve of the connecting shaft are assembled, it is easy to cause the connecting sleeve to expand and deform, making it difficult for the connecting sleeve to be inserted into the inner ring of the bearing, which affects the assembly of the planetary reducer;

2. It is easy to exert too much force on the shaft when the shaft of the sun gear and the connecting sleeve of the connecting shaft are assembled, and the shaft is easily deformed, resulting in poor concentricity between the sun gear and the connecting shaft, which may easily lead to problems such as operational jamming and loud noise of the planetary reducer .

Contents of the invention

The object of the present invention is to provide a sun gear assembly cutting structure to overcome the deficiencies in the prior art.

In order to achieve the above object, the solution of the present invention is:

A sun gear assembly cutting structure, which includes a sun gear and a connecting shaft; the sun gear includes a gear body and a wheel shaft coaxially connected with the gear body, and the wheel shaft is sequentially provided with external splines, ring grooves and In the piloting section, the wall surface where the ring groove and the external spline are connected is the cutting surface, and the cutting surface is inclined outward along the direction from the external spline to the piloting section, and a sharp cutting part is formed at the joint between the cutting surface and the external spline. The outer diameter of the segment is smaller than the outer diameter of the outer spline; the connecting shaft is provided with a connecting sleeve for connecting the wheel shaft, and the inner diameter of the connecting sleeve is larger than the outer diameter of the piloting section of the wheel shaft and smaller than the outer diameter of the outer spline of the wheel shaft; when the sun gear When the wheel shaft is connected to the connecting sleeve of the connecting shaft, the guiding section, the ring groove and the outer spline of the wheel shaft are inserted into the connecting sleeve in sequence, and the cutting part of the wheel shaft cuts the inner wall of the connecting sleeve to form an inner spline on the inner wall of the connecting sleeve. The external splines engage with the internal splines of the coupling sleeve.

The inclination angle of the cutting surface is 70° to 75°.

The inclination angle of the cutting surface is 75°.

The hardness of the axle is greater than that of the connecting sleeve.

The hardness of the axle is HRC57-60 degrees; the hardness of the connecting sleeve is HRC48-50 degrees.

The wall surface where the annular groove of the wheel shaft connects with the guiding section is a beveled surface parallel to the cutting surface.

An inclined guide surface is formed on the peripheral edge of the end of the guide section of the wheel shaft away from the ring groove, and the inclined guide surface is inclined inward along the direction away from the ring groove.

The gear main body and the axle of the sun gear are integrally formed.

After adopting the above scheme, the ring groove of the wheel shaft of the sun gear of the present invention is provided with a cutting surface, and the cutting surface forms a sharp cutting part at the joint of the external spline. When the wheel shaft of the sun gear is connected with the connecting sleeve of the connecting shaft, the wheel shaft The guide section, ring groove and external spline are inserted into the connecting sleeve in sequence, and the cutting part of the axle cuts the inner wall of the connecting sleeve so that the inner wall of the connecting sleeve forms an internal spline that engages with the external spline, so that the wheel shaft does not fit into the connecting sleeve. It will cause expansion and deformation of the connecting sleeve, and prevent the wheel shaft from deforming under excessive pressure, and at the same time ensure that the outer spline of the wheel shaft and the inner spline of the connecting sleeve are tightly meshed; wherein, the cutting part of the wheel shaft cuts the inner wall of the connecting sleeve and The resulting cutting chips will enter the ring groove without affecting the insertion of the axle into the coupling sleeve.

Description of drawings

Fig. 1 is a structural schematic diagram one of the sun gear of the present invention;

Fig. 2 is the second structural representation of the sun gear of the present invention;

Fig. 3 is the sectional view of sun gear of the present invention;

Fig. 4 is the structural representation of connecting shaft of the present invention;

Fig. 5 is the combination schematic diagram of sun gear and connecting shaft of the present invention;

Fig. 6 is the combination sectional view of sun gear and connecting shaft of the present invention;

Label description:

sun gear 1,

gear main body 11, teeth 111,

Axle 12, cutting part 120, external spline 121, ring groove 122, cutting surface 1221, beveled surface 1222, guiding section 123, beveled guiding surface 1231,

Connecting shaft 2, connecting sleeve 21, internal spline 211.

Detailed ways

In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

As shown in Figures 1 to 6, the present invention discloses a sun gear assembly cutting structure, which includes a sun gear 1 and a connecting shaft 2; the sun gear 1 includes a gear body 11 and a wheel shaft coaxially connected with the gear body 11 12. Teeth 111 can be formed on the outer wall of the gear main body 11. The wheel shaft 12 is provided with an external spline 121, an annular groove 122 and a guiding section 123 in sequence along the direction away from the gear main body 11. The outer diameter of the guiding section 123 is smaller than the external spline 121 The outer diameter of the ring groove 122 and the external spline 121 is the cutting surface 1221, the cutting surface 1221 is inclined outward along the direction from the external spline 121 to the guide section 123, so that the cutting surface 1221 is connected with the external spline 121 The connecting shaft 2 is provided with a connecting sleeve 21 for connecting the wheel shaft 12, the inner diameter of the connecting sleeve 21 is larger than the outer diameter of the pilot section 123 of the wheel shaft 12 and smaller than the outer diameter of the outer spline 121 of the wheel shaft 12.

In the present invention, the ring groove 122 of the wheel shaft 12 of the sun gear 1 is provided with a cutting surface 1221, and a sharp cutting portion 120 is formed at the connection between the cutting surface 1221 and the external spline 121, when the wheel shaft 12 of the sun gear 1 and the connecting shaft 2 When the connecting sleeve 21 is connected, the guiding section 123, the ring groove 122 and the external spline 121 of the wheel shaft 12 are inserted into the connecting sleeve 21 in sequence, and the cutting part 120 of the wheel shaft 12 cuts the inner wall of the connecting sleeve 21 so that the inner wall of the connecting sleeve 21 forms a The inner spline 211 engaged with the outer spline 121 prevents the expansion and deformation of the connecting sleeve 21 when the wheel shaft 12 is inserted into the connecting sleeve 21, and prevents the wheel shaft 12 from being deformed under excessive pressure, and at the same time ensures that the outer surface of the wheel shaft 12 is The splines 121 are closely engaged with the splines 211 in the connecting sleeve 21; wherein, the cutting chips generated by cutting the inner wall of the connecting sleeve 21 by the cutting portion 120 of the wheel shaft 12 will enter the ring groove 122 without affecting the insertion of the wheel shaft 12 into the connecting sleeve 21 middle. The specific assembly method of the wheel shaft 12 of the sun gear 1 and the connecting sleeve 21 of the connecting shaft 2 of the present invention is: first insert the guiding section 123 of the wheel shaft 12 into the connecting sleeve 21 of the connecting shaft 2, and then use a hydraulic press or a servo press to press The installation equipment puts pressure on the sun gear 1, so that the annular groove 122 and the external spline 121 of the wheel shaft 12 are pressed into the connecting sleeve 21 of the connecting shaft 2, and at the same time, the cutting part 120 of the wheel shaft 12 cuts the inner wall of the connecting sleeve 21 so that An inner spline 211 engaged with the outer spline 121 is formed on the inner wall of the connecting sleeve 21 .

In the present invention, the hardness of the axle 12 is greater than that of the connecting sleeve 21, which is beneficial for the cutting part 120 to cut the inner wall of the connecting sleeve 21; the axle 12 and the gear body 11 can be integrally formed, and the hardness of the axle 12 is HRC57~ 60 degrees, the material of the axle 12 can be 20CrNiMo and the axle 12 has undergone carburizing heat treatment; the hardness of the connecting sleeve 21 is HRC48~50 degrees, the material of the connecting sleeve 21 can be 15CrMo and the connecting sleeve 21 has undergone carburizing heat treatment.

In the present invention, the inclination angle θ of the cutting surface 1221 of the wheel shaft 12 is 70° to 75°, and the inclination angle θ of the cutting surface 1221 is preferably 75°, which can not only ensure the strength of the cutting part 120, but also facilitate The cutting part 120 cuts the inner wall of the connecting sleeve 21 with less effort.

In the present invention, the wall surface where the ring groove 122 of the wheel shaft 12 connects with the guide section 123 is a beveled surface 1222 parallel to the cutting surface 1221, so that the present invention can mill the wheel shaft 12 with a milling cutter to process the ring at one time. The cutting surface 1221 of the groove 122 is parallel to the beveled surface 1222, which is convenient for processing and production.

In the present invention, the guide section 123 of the wheel shaft 12 forms an inclined guide surface 1231 on the peripheral edge of the end away from the annular groove 122, and the inclined guide surface 1231 is inclined inwardly along the direction away from the annular groove 122, and the inclined guide surface 1231 is conducive to The guiding section 123 is inserted into the connecting sleeve 21 . The surface of the guiding section 123 of the axle 12 can be coated with sealant; when the axle 12 of the sun gear 1 is connected to the connecting sleeve 21 of the connecting shaft 2, the sealing glue will seal the surface of the guiding section 123 and the inner wall of the connecting sleeve 21, thereby Prevent the lubricating oil inside the casing of the planetary reducer from leaking out from the gap between the surface of the guide section 123 and the inner wall of the connecting sleeve 21, thereby affecting the work of the planetary reducer.

The above-mentioned embodiments and drawings do not limit the form and style of the product of the present invention, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims (9)

1. A sun gear assembles cutting structure which characterized in that: comprises a sun gear and a connecting shaft;

the sun gear comprises a gear main body and a wheel shaft coaxially connected with the gear main body, the wheel shaft is sequentially provided with an external spline, an annular groove and a pilot section along the direction far away from the gear main body, the wall surface of the annular groove connected with the external spline is a cutting surface, the cutting surface inclines outwards along the direction from the external spline to the pilot section, a sharp cutting part is formed at the connection part of the cutting surface and the external spline, and the outer diameter of the pilot section is smaller than that of the external spline;

the connecting shaft is provided with a connecting sleeve for connecting a wheel shaft, and the inner diameter of the connecting sleeve is larger than the outer diameter of the guide section of the wheel shaft and smaller than the outer diameter of an external spline of the wheel shaft;

when the wheel shaft of the sun gear is connected with the connecting sleeve of the connecting shaft, the pilot section, the annular groove and the external spline of the wheel shaft are sequentially inserted into the connecting sleeve, the cutting part of the wheel shaft cuts the inner wall of the connecting sleeve to enable the inner wall of the connecting sleeve to form the internal spline, and the external spline of the wheel shaft is meshed with the internal spline of the connecting sleeve.

2. A sun gear fitting cutting structure as set forth in claim 1, wherein: the cutting face has an inclination angle of 70 ° to 75 °.

3. A sun gear fitting cutting structure as set forth in claim 2, wherein: the cutting face has an inclination angle of 75 °.

4. A sun gear fitting cutting structure as set forth in claim 1, wherein: the hardness of the wheel shaft is greater than that of the connecting sleeve.

5. A sun gear fitting cutting structure as set forth in claim 1, wherein: the hardness of the wheel shaft is HRC 57-60 degrees; the hardness of the connecting sleeve is HRC 48-50 degrees.

6. A sun gear fitting cutting structure as set forth in claim 1, wherein: the wall surface of the annular groove of the wheel shaft, which is connected with the guide section, is an oblique cutting surface parallel to the cutting surface.

7. A sun gear fitting cutting structure as set forth in claim 1, wherein: the leading section of shaft keeps away from the tip periphery of annular and forms oblique lead surface, and oblique lead surface inwards inclines along the direction of keeping away from the annular.

8. A sun gear fitting cutting structure according to any one of claims 1 to 7, wherein: the gear body and the wheel shaft of the sun gear are integrally formed.

9. A sun gear fitting cutting structure as set forth in claim 1, wherein: a sealant is coated on the surface of the pilot section of the wheel shaft; when the wheel shaft of the sun gear is connected with the connecting sleeve of the connecting shaft, the surface of the pilot section is sealed with the inner wall of the connecting sleeve by the sealant.

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