CN215880636U - Rivet head assembly and riveting die using same - Google Patents

Abstract

The utility model relates to a rivet head assembly and a riveting die using the same, which are suitable for a motor output shaft assembly and comprise: the riveting head, the guide block and the pre-pressing block; the riveting head is used for riveting an output shaft of the motor output shaft assembly; the guide block is arranged in the rivet head and is suitable for reciprocating along the axial direction of the output shaft so as to position the shaft head of the output shaft; the prepressing block is sleeved on the outer side of the rivet head and used for abutting against a gear of the motor output shaft assembly; the end part of the guide block opposite to the output shaft is suitable for extending out of the end part of the pre-pressing block opposite to the output shaft. The riveting effect between the motor output shaft and the gear can be optimized.

Description

Rivet head assembly and riveting die using same

Technical Field

The utility model relates to the technical field of riveting equipment, in particular to a riveting head assembly and a riveting die using the same.

Background

Motors are widely used in household appliances. In a motor with a reduction gear mechanism, the torque of the motor is generally output through a gear mechanism and an output shaft assembly, the output shaft assembly consists of a gear and an output shaft, the gear and the output shaft are mostly riveted and fixed through a riveting die, the gear and the reduction gear mechanism are in meshing transmission, and the output shaft is arranged outside the motor and is matched with a mounting hole in a household appliance for mounting. Wherein, the gear and the output shaft in the output shaft assembly must have certain pull-off strength.

In the prior art, in the riveting process of a gear of an output shaft assembly and an output shaft, the axial depth position of a riveting mark is determined by the up-down reciprocating stroke of a small punch; the radial position of riveting is mainly determined by the matching precision of the upper die guide sleeve and the lower die guide post and the matching precision of the inner diameter of the lower die carrier and the outer diameter of the output shaft; in addition, in the riveting process, in order to not influence the production efficiency, a certain gap is required to be formed between the output shaft and a lower die carrier of the riveting die, so that the assembly is convenient. Therefore, the riveting radial position is influenced by the matching precision of the upper die and the lower die, the matching precision of the output shaft and the lower die and the clearance between the output shaft and the lower die, the riveting mark of the output shaft assembly is eccentric to the output shaft, the whole ring of the output shaft is not riveted on the radial direction uniformly, part of the riveting mark is large, part of the riveting mark is small, the riveting mark part which can bring the output shaft assembly falls off to generate riveting mark garbage blocking motor, and the gear of the output shaft assembly and the motor which is caused by the small pull-out strength of the output shaft fall off to generate adverse effects such as the output shaft falling off.

SUMMERY OF THE UTILITY MODEL

The first purpose of the utility model is to provide a rivet head assembly to solve the technical problem of optimizing the riveting effect between the output shaft of the motor and the gear

The second purpose of the utility model is to provide a riveting die to solve the technical problem of optimizing the riveting effect between the motor output shaft and the gear.

The rivet head assembly of the utility model is realized as follows:

a rivet head assembly is suitable for a motor output shaft assembly; the method comprises the following steps:

the riveting head is used for riveting an output shaft of the motor output shaft assembly;

the guide block is arranged in the rivet head and is suitable for reciprocating along the axial direction of the output shaft so as to position the shaft head of the output shaft;

the pre-pressing block is sleeved outside the riveting head and used for abutting against a gear of the motor output shaft assembly; wherein

The end part of the guide block opposite to the output shaft is suitable for extending out of the end part of the pre-pressing block opposite to the output shaft.

In an alternative embodiment of the utility model, a groove adapted to cooperate with the stub shaft of the output shaft is provided on the guide block at the end opposite the output shaft.

In an optional embodiment of the utility model, a chamfer R is arranged at the end part of the guide block opposite to the output shaft and at the edge of the notch of the groove; and

0.1≤R≤0.4。

in an alternative embodiment of the utility model, a mounting hole for accommodating the guide block is formed in the rivet head in a penetrating manner;

the assembly hole is also internally provided with an elastic body which is suitable for abutting against the end part of the guide block opposite to the output shaft; and

the end part of the guide block opposite to the output shaft is suitable for extending out of the end part of the pre-pressing block opposite to the output shaft under the propping of the elastic body.

In an alternative embodiment of the utility model, the end of the pre-pressing block facing the output shaft is protruded from the end of the rivet head facing the output shaft.

In an alternative embodiment of the present invention, the fitting hole includes a large inner diameter portion and a small inner diameter portion which are penetrated, and an L-shaped step is formed between the large inner diameter portion and the small inner diameter portion; and

the guide block comprises a guide hanging table arranged in the large inner diameter part and suitable for being hung on the L-shaped step, and a guide body which is connected with the guide hanging table and suitable for penetrating through the small inner diameter part and then extending out of the rivet head;

the groove is arranged in the guide body.

The riveting die of the utility model is realized by the following steps:

a riveting die comprising: the riveting die comprises a lower positioning die assembly and an upper riveting die assembly which is arranged above the lower positioning die assembly and is suitable for longitudinal reciprocating motion; wherein

The lower positioning die assembly comprises a positioning sleeve for positioning the shaft root part of the output shaft of the motor output shaft assembly;

the upper riveting die assembly comprises the rivet head assembly;

when the upper riveting die assembly moves downwards relative to the lower positioning die assembly, the guide block of the riveting head assembly positions the shaft head of the output shaft before the riveting head rivets the output shaft.

In an optional embodiment of the utility model, a positioning hole suitable for inserting the shaft root of the output shaft is arranged in the positioning sleeve; and

and a chamfer C is arranged at the end part of the positioning sleeve opposite to the rivet head and at the edge of the hole opening of the positioning hole.

In an alternative embodiment of the utility model, the shaft root part of the output shaft comprises a small outer diameter part and a large outer diameter part which are integrally connected; wherein

The large outer diameter part is positioned between the small outer diameter part and the shaft head;

the circumferential clearance between the positioning hole and the large-outer-diameter part is 0.02-0.05 mm.

In an optional embodiment of the utility model, a first step surface, a second step surface and a third step surface are sequentially and alternately arranged on the axial side wall of the output shaft along the axial direction of the shaft head to the root part of the shaft; wherein

The first step surface is used for being abutted against the end part of the guide block facing the output shaft;

the second step surface is suitable for contacting the end part of the rivet head facing the output shaft to form a riveting part;

the third step surface is used for positioning the gear; when the gear is sleeved on the output shaft, the end part of the gear facing the rivet head is lower than the end part of the second step surface facing the rivet head; and

the vertical distance between the end face of the pre-pressing block facing the output shaft and the end face of the rivet head facing the output shaft is larger than the vertical distance between the end face of the second step face facing the rivet head and the end face of the gear facing the rivet head.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects: according to the riveting head assembly and the riveting die using the same, the shaft head of the output shaft is positioned by the guide block, and the shaft head and each step surface are integrally machined and formed in the processing process of the output shaft, so that the coaxiality is high, and the positioning of the second step surface which is suitable for being in contact with a riveting head to form a riveting part is realized through the positioning of the shaft head. Therefore, the concentricity between the rivet head and the output shaft is increased, when the rivet head rivets the riveting part of the second step surface of the output shaft, the height of the riveting part of the second step surface is consistent in the radial direction, the concentricity of the output shaft and the riveting mark is ensured, and the riveting quality and strength are ensured.

In addition, the guide block is in sliding fit with the rivet head, and the guide block is in sliding fit with the shaft head of the output shaft, so that the main factors influencing the concentricity between the rivet mark and the output shaft are the matching precision of the guide block and the shaft head of the output shaft and the matching precision of the guide block and the rivet head, and thus, the positioning method is changed, the size chain influencing the concentricity is reduced, and the debugging time of the mold can be saved; meanwhile, the concentricity of the riveting mark and the output shaft is ensured, the riveting quality and the riveting strength are improved, and the undesirable phenomena of falling off between the output shaft and the gear and the like are effectively avoided.

Moreover, aiming at output shafts with different specifications, only the guide block and the riveting head in the die need to be replaced, the replacement is convenient, and the universality of the whole riveting die is improved.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic overall structural view of a riveting die provided by an embodiment of the utility model;

fig. 2 is a schematic diagram illustrating an overall matching structure of a guide block, a rivet head and a pre-pressing block of the riveting die provided by the embodiment of the utility model;

fig. 3 is a schematic view illustrating an explosive structure of a guide block, a rivet head and a pre-pressing block of the riveting die provided by the embodiment of the utility model;

fig. 4 is a schematic cross-sectional view illustrating the overall fit of a guide block, a rivet head and a pre-pressing block of the riveting die provided by the embodiment of the utility model;

FIG. 5 is a schematic illustration of an output shaft assembly suitable for use with a riveting die provided by an embodiment of the utility model;

FIG. 6 is a schematic structural diagram of a riveting die provided by an embodiment of the utility model in a die closing process;

FIG. 7 is a schematic structural diagram of a riveting die provided by an embodiment of the utility model after die assembly is completed;

fig. 8 is a schematic diagram illustrating a rivet mark formed by the riveting die according to the embodiment of the utility model after the die assembly is completed (i.e., an enlarged view of a portion E in fig. 7);

fig. 9 is a schematic diagram illustrating the cooperation between an upper riveting die assembly and a lower positioning die assembly in the process of closing the die of the riveting die provided by the embodiment of the utility model;

FIG. 10 shows an enlarged view of section A of FIG. 9;

FIG. 11 shows an enlarged view of section B of FIG. 9;

fig. 12 shows an enlarged view of the portion D of fig. 9.

In the figure: the riveting die comprises a die shank 11, an upper die base 12, an upper backing plate 13, a rivet head fixing base 14, a rivet head 15, a large inner diameter portion 151, a small inner diameter portion 152, an elastic body 16, a rivet head hanging table 17, a prepressing block 18, a guide hanging table 19, a guide body 110, a groove 111, a positioning sleeve 21, a fixing base 22, a lower backing plate 23, a lower die base 24, a positioning hanging table 25, a positioning hole 26, a cushion block 27, an output shaft 30, a first step surface 31, a second step surface 32, a third step surface 33, a shaft head 34, a shaft root 35, a gear 40 and riveting marks K.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Example 1:

referring to fig. 2 to 5, the present embodiment provides a rivet head assembly, which is suitable for an output shaft assembly of a motor, where the output shaft assembly is composed of a gear 40 and an output shaft 30, and the rivet head assembly of the present embodiment is used for realizing riveting fixation between the gear 40 and the output shaft 30.

Specifically, the rivet head assembly of the present embodiment includes a rivet head 15 for riveting the output shaft 30, a guide block disposed in the rivet head 15 and adapted to perform a reciprocating motion along the axial direction of the output shaft 30 for positioning the shaft head 34 of the output shaft 30, and a pre-pressing block 18 sleeved outside the rivet head 15 and used for pressing against the gear 40 of the motor output shaft assembly. Here, the guide block is in a sliding fit with the rivet head 15.

By way of example, in an alternative embodiment, with reference to the drawings, the positioning engagement between the guide block and the stub shaft 34 of the output shaft 30 in the present embodiment is achieved as follows:

in particular, the guide block is provided with a groove 111 at the end opposite to the output shaft 30, adapted to cooperate with the stub shaft 34 of the output shaft 30. When the rivet head assembly of the embodiment is applied between the upper riveting die assembly and the lower positioning die assembly to perform die closing movement, the guide block and the shaft head 34 of the output shaft 30 are in sliding fit with each other to position the shaft head 34 through the groove 111; when the upper riveting die assembly and the lower positioning die assembly perform die opening movement, the guide block and the shaft head 34 of the output shaft 30 are in sliding fit with each other to realize separation between the groove 111 and the shaft head 34.

Regarding the pre-pressing block 18, the pre-pressing block 18 and the rivet head 15 of the present embodiment are fixedly connected by, for example, but not limited to, welding. Specifically, the center of the pre-pressing block 18 is provided with a through hole, and the inner circular surface of the pre-pressing block 18 is matched with the outer circular surface of the corresponding matching part on the rivet head 15, and the pre-pressing block and the rivet head are fixedly connected.

It should be noted that, in the output shaft 30 of the present embodiment, a first step surface 31, a second step surface 32 and a third step surface 33 are sequentially and alternately provided on the axial side wall along the spindle head 34 toward the spindle root 35; and the outer diameters of the first step surface 31, the second step surface 32, and the third step surface 33 are sequentially increased. The first step surface 31 here is for abutting against the end of the guide block facing the output shaft 30; the second step surface 32 is suitable for contacting with the end part of the rivet head 15 facing the output shaft 30 to form a riveting part; the third step surface 33 is used to position the gear 40.

Next, in consideration of efficient convenience of the adjustment of the structure of the integral mold, the embodiment will be described with reference to the accompanying drawings in terms of specific positions among the guide block, the rivet head 15 and the pre-pressing block 18 in a structure:

firstly, before the upper riveting die assembly and the lower positioning die assembly perform die closing movement, the end part of the guide block, which is opposite to the output shaft 30, is suitable for extending out of the outer side of the end part of the prepressing block 18, which is opposite to the output shaft 30; the significance of this is that, on the one hand, the adaptation to the height difference existing between the second step surface 32 and the third step surface 33 of the output shaft 30 is achieved by the height difference between the two opposing ends of the preload block 18 and the guide block and the output shaft 30; on the other hand, when the upper riveting die assembly and the lower positioning die assembly perform the die closing movement, the guide block positions the shaft head 34 of the output shaft 30 before the pre-pressing block 18 presses the gear 40.

Furthermore, on the basis of the above structure, before the mold closing movement is performed between the upper rivet pressing mold assembly and the lower positioning mold assembly, the end of the pre-pressing block 18 facing the output shaft 30 is protruded from the end of the rivet head 15 facing the output shaft 30, that is, the end of the guide block opposite to the output shaft 30 is protruded outside the end of the rivet head 15 opposite to the output shaft 30, and here, in combination with the direction from the upper rivet pressing mold assembly to the lower positioning mold assembly, a first step surface 31 for cooperating with the guide block is located above a second step surface 32 forming a caulking portion, in this case, when the upper riveting die assembly and the lower positioning die assembly perform the die assembly movement, namely, before the rivet head 15 contacts with the second step surface 32, the pre-pressing block 18 and the gear 40 complete the abutting fit, and then the guide block and the first step surface 31 complete the positioning fit, to avoid the problem of starting the caulking process before the precise positioning of the output shaft 30 and the gear 40 is not completed.

In this case, that is, when the upper riveting die assembly and the lower positioning die assembly perform the die closing movement for riveting the motor shaft output assembly, the guide block and the first step surface 31 of the output shaft 30 complete the positioning engagement, and then the pre-pressing block 18 and the gear 40 contact and engage, and finally the riveting of the output shaft 30 by the riveting head 15 is performed.

Next, referring to the drawings, by way of example, in an alternative implementation, in this embodiment, the condition that the end of the guide block opposite to the output shaft 30 before the mold closing movement between the upper rivet pressing mold assembly and the lower positioning mold assembly can protrude outside the end of the pre-pressing block 18 opposite to the output shaft 30 is realized by the following structure:

a mounting hole for accommodating the guide block is formed in the rivet head 15 in a penetrating manner; an elastic body 16 which is suitable for abutting against the end part of the guide block opposite to the output shaft 30 is further arranged in the assembly hole, and the elastic body 16 is a spring for example and not limited; and the end part of the guide block opposite to the output shaft 30 extends out of the end part of the pre-pressing block 18 opposite to the output shaft 30 through the abutting action of the elastic body 16.

More specifically, the fitting hole includes a large inner diameter portion 151 and a small inner diameter portion 152 penetrating therethrough, and an L-shaped step is formed between the large inner diameter portion 151 and the small inner diameter portion 152; the guide block comprises a guide hanging table 19 arranged in the large inner diameter part 151 and suitable for being hung on the L-shaped step, and a guide body 110 which is connected with the guide hanging table 19 and suitable for penetrating through the small inner diameter part 152 and then extending out of the rivet head 15; the groove 111 is provided in the guide body 110.

In addition, when the gear 40 is sleeved on the output shaft 30, the end of the gear 40 facing the rivet head 15 is lower than the end of the second step surface 32 facing the rivet head 15; the perpendicular distance L2 between the end face of the preload block 18 facing the output shaft 30 and the end face of the rivet head 15 facing the output shaft 30 is greater than the perpendicular distance L1 between the end face of the second step face 32 facing the rivet head 15 and the end face of the gear 40 facing the rivet head 15, i.e. L2> L1.

Example 2:

referring to fig. 10, on the basis of the rivet head assembly of embodiment 1, a chamfer R is provided at the end of the rivet head assembly opposite to the output shaft 30 of the guide block and at the edge of the notch of the groove 111; and R is more than or equal to 0.1 and less than or equal to 0.4.

Specifically, in the riveting process, the chamfer R increases the inner diameter of the notch of the inner groove 111 of the guide block so as to be conductive to the groove 111 of the guide block when the shaft head 34 of the output shaft 30 just contacts, and the chamfer R does not have a corner angle, so that the shaft head 34 of the output shaft 30 can be prevented from being scratched.

The chamfer R should not be too small or too large, and too small may not provide a good guiding effect, while too large may result in too small contact between the guide block and the first step surface 31, and may easily damage the first step surface 31.

Example 3:

referring to fig. 1 to 9, on the basis of the rivet head assembly of embodiment 1 or embodiment 2, the present embodiment provides a riveting mold, including: the lower positioning die assembly and the upper riveting die assembly are arranged above the lower positioning die assembly; in the process of riveting the output shaft assembly, the upper riveting die assembly does longitudinal reciprocating motion relative to the lower positioning die assembly. In detail, the riveting processing is completed by the longitudinal downward movement of the upper riveting die assembly to the lower positioning die assembly (the movement process is defined as the die closing movement between the upper riveting die assembly and the lower positioning die assembly in the utility model); after the riveting process is completed, the upper riveting die assembly moves upwards in the longitudinal direction relative to the lower positioning die assembly (the movement process is defined as the die opening movement between the upper riveting die assembly and the lower positioning die assembly) to return to the state before the riveting process.

In addition to the above structure, more specifically, the upper squeeze die assembly includes the rivet head assembly of embodiment 1 or embodiment 2. And the lower positioning die assembly includes a positioning sleeve 21 for positioning a shaft root 35 of the output shaft 30 of the motor output shaft assembly.

In addition, for the riveting die assembly in the embodiment, the riveting die assembly further comprises the following structure: the riveting die comprises a rivet head fixing seat 14 connected with a rivet head 15, an upper die seat 12 connected with the rivet head fixing seat 14, an upper backing plate 13 clamped between the rivet head fixing seat 14 and the upper die seat 12, and a die handle 11 connected with one end of the upper die seat 12, which is far away from the rivet head fixing seat 14. The die handle 11 is fixedly connected with the punch through a screw, so that the whole upper riveting die assembly and the punch are mounted and fixed; the upper die holder 12 is fixedly connected with the external thread of the die handle 11 through threads and is used for fixing the upper backing plate 13 and the rivet head fixing seat 14 and transferring pressure; the upper backing plate 13 is used for fixing the plane position through two symmetrical positioning pins and two screws, and the upper die base 12 and the rivet head fixing base 14 are used for clamping and fixing the upper position and the lower position, so that the effect of preventing the rivet head 15 from jacking the die base is achieved; the rivet fixing seat 14 is in threaded connection with the upper die base 12 through threads, and is accurately positioned through two symmetrical positioning pins for fixing the rivet 15. The rivet head 15 is connected and fixed with the rivet head fixing seat 14 through a rivet head hanging table 17 which is integrally connected with the rivet head 15 and is larger than the rivet head 15 in size. On the basis of the structure, the lower end surface of the spring is matched with the upper end surface of the guide hanging table 19, and the upper end surface of the spring penetrates through the top of the rivet head fixing seat 14 and then is matched with the lower end surface of the upper backing plate 13. With such a structure, when the riveting die of the embodiment is in an unmated state, the guide block and the rivet head 15 are matched through the L-shaped step under the elastic force of the spring.

In addition, the lower positioning module assembly of the present embodiment further includes the following structure, specifically: a fixed seat 22 fixedly matched with the positioning sleeve 21, a lower die seat 24 matched with the fixed seat 22 in a matching mode, and a lower cushion plate 23 fixedly clamped between the fixed seat 22 and the lower die seat 24; a positioning hole 26 which is suitable for inserting the shaft root 35 of the output shaft 30 is arranged in the positioning sleeve 21 and plays a role in positioning the output shaft 30, the positioning sleeve 21 is matched with the fixed seat 22 through the positioning hanging table 25, the outer circular surface of the positioning sleeve 21 is matched and fixedly installed with the inner circular surface of the fixed seat 22, and the lower end face of the positioning sleeve 21 is matched with the upper end face of the lower backing plate 23; the fixed seat 22 is in threaded connection with the lower die seat 24 through threads, and is accurately positioned through two symmetrical positioning pins to fix the positioning sleeve 21; the lower backing plate 23 fixes the plane position through two symmetrical positioning pins, and the lower die holder 24 and the fixing seat 22 clamp and fix the upper and lower positions to prevent the lower die holder 24 from being damaged by extrusion in the stamping process; the lower die holder 24 is in threaded connection with the fixing holder 22 through screws and is used for fixing the lower backing plate 23 and the fixing holder 22.

Finally, the riveting die of the embodiment further comprises a guide assembly arranged between the upper die base 12 of the upper riveting die assembly and the lower die base 24 of the lower positioning die assembly; the guide assembly comprises a guide pillar 51 and a guide sleeve 52 which are connected in a sleeved mode, and the precision of the movement track between the upper riveting die assembly and the lower positioning die assembly in the die assembling process is achieved through the guide assembly.

Example 4:

referring to fig. 12, on the basis of the riveting mold of embodiment 3, the riveting mold provided in this embodiment is provided with a chamfer C at the end of the positioning sleeve 21 opposite to the rivet head 15 and at the edge of the opening of the positioning hole 26.

In the riveting process, the chamfer C increases the bore inner diameter of the positioning hole 26 of the positioning sleeve 21 to facilitate the assembly of the output shaft 30 into the positioning sleeve 21, so that the assembly gap between the output shaft 30 and the positioning sleeve 21 can be reduced, and the assembly precision can be increased.

Example 5:

on the basis of the riveting die of embodiment 3 or embodiment 4, the shaft root 35 of the output shaft 30 of the riveting die provided by the present embodiment includes a small outer diameter portion and a large outer diameter portion that are integrally connected; wherein the large outer diameter portion is located between the small outer diameter portion and the stub shaft 34; the circumferential clearance between the positioning hole 26 and the large-outer diameter part is 0.02-0.05 mm. Because the output shaft 30 needs to be positioned before riveting, and the output shaft 30 has a certain displacement in the radial direction in the positioning process, the circumferential clearance between the inner hole of the positioning hole 26 and the large-outer diameter part of the output shaft 30 is 0.02-0.05 mm.

Example 6:

referring to fig. 11, on the basis of the riveting mold of embodiment 3, embodiment 4, or embodiment 5, a spacer 27 is further disposed in the positioning hole 26 of the riveting mold provided in this embodiment, and supports the output shaft 30 from an end of the output shaft 30 away from the rivet head 15. The cushion block 27 has the main functions of easy replacement and low cost after long-time riveting, stress, abrasion and deformation.

By dimensioning the spacer 27, the output shaft 30 position thereon is maintained as: the end surface of the third step surface 33 of the output shaft 30 is higher than the end surface of the positioning sleeve 21 facing the rivet head 15, and in combination with fig. 11, a height difference L3 exists between the end surface of the third step surface 33 of the output shaft 30 and the end surface of the positioning sleeve 21 facing the rivet head 15; here, L3 < 2mm is generally 1 mm. ltoreq.L 3. If L3 is too small, the lower end face of the gear 40 first contacts the end face of the positioning sleeve 21 and cannot contact the third step face 33 of the output shaft 30 during the mold closing process due to the deformation of the gear 40, the machining tolerance and the machining tolerance of the output shaft 30, and a gap exists between the gear 40 and the third step face 33 after the gear 40 is riveted with the output shaft 30. If L3 is too large, the accuracy of the positioning sleeve 21 in positioning the lower end of the output shaft 30 in the radial direction is affected.

In summary, the riveting mold of the present invention specifically includes:

step S1: the shaft root part 35 of the output shaft 30 of the motor output shaft assembly is positioned by the positioning sleeve 21, so that the shaft head 34 of the output shaft 30 is opposite to the upper riveting die assembly;

step S2: the upper riveting die assembly moves downwards relative to the lower positioning die assembly;

step S3: the guide block positions the stub shaft 34 of the output shaft 30;

step S4: the pre-pressing block presses the gear 40;

step S5: the rivet head 15 rivets the output shaft 30.

In detail, the riveting die of the embodiment is used in the following specific process:

firstly, the output shaft 30 is put into the positioning sleeve 21 for positioning;

secondly, the upper riveting die assembly performs die closing movement relative to the lower positioning die assembly, the shaft head 34 of the output shaft 30 firstly enters the groove 111 of the guide block, radial matching and positioning of the guide block and the shaft head 34 of the output shaft 30 are realized, and the guide block, the riveting head 15 and the prepressing block 18 move together due to the pressure of the spring on the guide block in the process;

thirdly, the upper riveting die assembly continues to be closed downwards, the pre-pressing block 18 presses the gear 40, the gear 40 and the output shaft 30 are axially matched in place (namely, the lower end face of the gear 40 is matched with the third step face 33 of the output shaft 30 in place, and the vertical distance between the end face, facing the rivet head 15, of the second step face 32 and the end face, facing the rivet head 15, of the gear 40 and the end face, facing the rivet head 15 is L1);

thirdly, the upper riveting die assembly continues to be closed downwards, the prepressing block 18 presses the gear 40 and has a certain compression amount (L2 is greater than L1, wherein L2 is a vertical distance L2 between the end face, facing the output shaft 30, of the prepressing block 18 and the end face, facing the output shaft 30, of the rivet head 15, the end face, facing the output shaft 30, of the rivet head 15 is in contact with a riveting part on the second step face 32 of the output shaft 30, and a riveting mark K is formed;

thirdly, after riveting is finished, the upper riveting die assembly performs die opening movement relative to the lower positioning die assembly, and the output shaft 30 is separated from the riveting head 15 by elastic force generated by the prepressing block 18 which is compressed to a certain extent before;

finally, the guide block is reset by gravity and the elastic force of the elastic body 16.

The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims (10)

1. A rivet head assembly is suitable for a motor output shaft assembly; it is characterized by comprising:

the riveting head is used for riveting an output shaft of the motor output shaft assembly;

the guide block is arranged in the rivet head and is suitable for reciprocating along the axial direction of the output shaft so as to position the shaft head of the output shaft;

the pre-pressing block is sleeved outside the riveting head and used for abutting against a gear of the motor output shaft assembly; wherein

The end part of the guide block opposite to the output shaft is suitable for extending out of the end part of the pre-pressing block opposite to the output shaft.

2. The rivet head assembly of claim 1 wherein a recess adapted to engage the head of the output shaft is provided in the guide block at the end opposite the output shaft.

3. The rivet head assembly of claim 2, wherein a chamfer R is provided at the end of the guide block opposite the output shaft and at the edge of the notch of the groove; and

0.1≤R≤0.4。

4. the rivet head assembly of any one of claims 2 or 3, wherein a fitting hole for receiving a guide block is formed through the rivet head;

the assembly hole is also internally provided with an elastic body which is suitable for abutting against the end part of the guide block opposite to the output shaft; and

the end part of the guide block opposite to the output shaft is suitable for extending out of the end part of the pre-pressing block opposite to the output shaft under the propping of the elastic body.

5. The rivet head assembly of claim 4 wherein the end of the pre-press block facing the output shaft is raised above the end of the rivet head facing the output shaft.

6. The rivet head assembly of claim 4, wherein the assembly hole includes a large inner diameter portion and a small inner diameter portion therethrough, and an L-shaped step is formed between the large inner diameter portion and the small inner diameter portion; and

the guide block comprises a guide hanging table arranged in the large inner diameter part and suitable for being hung on the L-shaped step, and a guide body which is connected with the guide hanging table and suitable for penetrating through the small inner diameter part and then extending out of the rivet head;

the groove is arranged in the guide body.

7. A riveting die, comprising: the riveting die comprises a lower positioning die assembly and an upper riveting die assembly which is arranged above the lower positioning die assembly and is suitable for longitudinal reciprocating motion; wherein

The lower positioning die assembly comprises a positioning sleeve for positioning the shaft root part of the output shaft of the motor output shaft assembly;

the upper riveting die assembly comprises the rivet head assembly as defined in any one of claims 1-6;

when the upper riveting die assembly moves downwards relative to the lower positioning die assembly, the guide block of the riveting head assembly positions the shaft head of the output shaft before the riveting head rivets the output shaft.

8. The riveting die of claim 7, wherein a locating hole adapted for insertion of a shaft root of the output shaft is provided in the locating sleeve; and

and a chamfer C is arranged at the end part of the positioning sleeve opposite to the rivet head and at the edge of the hole opening of the positioning hole.

9. The riveting die of claim 8, wherein the shaft root of the output shaft comprises a small outer diameter portion and a large outer diameter portion that are integrally connected; wherein

The large outer diameter part is positioned between the small outer diameter part and the shaft head;

the circumferential clearance between the positioning hole and the large-outer-diameter part is 0.02-0.05 mm.

10. The riveting die of claim 7, wherein the output shaft is provided with a first step surface, a second step surface and a third step surface on the axial side wall thereof at intervals in sequence along the axial direction of the shaft head to the root of the shaft; wherein

The first step surface is used for being abutted against the end part of the guide block facing the output shaft;

the second step surface is suitable for contacting the end part of the rivet head facing the output shaft to form a riveting part;

the third step surface is used for positioning the gear; when the gear is sleeved on the output shaft, the end part of the gear facing the rivet head is lower than the end part of the second step surface facing the rivet head; and

the vertical distance between the end face of the pre-pressing block facing the output shaft and the end face of the rivet head facing the output shaft is larger than the vertical distance between the end face of the second step face facing the rivet head and the end face of the gear facing the rivet head.

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