CN111981047A

CN111981047A - Axial limiting method for inner ring and outer ring of gear bearing of electronic brake booster unit

Info

Publication number: CN111981047A
Application number: CN202010930109.0A
Authority: CN
Inventors: 赵洵; 李晨风; 贾广宏
Original assignee: Tianjin Trinova Automotive Technology Co ltd
Current assignee: Tianjin Trinova Automotive Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2020-11-24

Abstract

The invention discloses an axial limiting method for an inner ring and an outer ring of a gear bearing of an electronic brake booster device. In the invention, the axial length of the gear bearing is shortened, the use of other parts on the shaft is reduced, the space utilization rate is improved, the mechanism is more compact, meanwhile, in order to reduce the production cost, improve the practicability of the structure and facilitate the mass production, the axial movement of the inner ring and the outer ring of the bearing is limited through the assembly mode of the hollow shaft and the gear and the mode of limiting the two ends of the inner ring and the outer ring of the bearing, the axial length of the assembly is greatly shortened, the application of other parts on the shaft is reduced, the mechanism is more compact, the stress concentration and the deformation of the shaft are reduced through the design of slotting at the flanging part, the riveting force is reduced, and the small end of the bearing sleeve is used for mounting a dust cover to play a certain sealing role.

Description

Axial limiting method for inner ring and outer ring of gear bearing of electronic brake booster unit

Technical Field

The invention relates to the technical field of automobile braking and gear bearings, in particular to an axial limiting method for an inner ring and an outer ring of a gear bearing of an electronic braking power assisting device.

Background

The gear is an injection molded cylindrical outer helical gear, an inner spline is arranged in the middle of the gear, an axial part with the outer spline can be matched with the inner spline of the gear to rotate, and can also axially slide relative to the gear, and the gear can only rotate around a central axis. The bearing inner race is the movable coil, rotates along with gear and axle, needs to be connected gear and bearing inner race through the hollow shaft, also needs to have the structure to have axial spacing to the bearing inner race on the axle, prevents that the bearing from deviating from. The outer ring of the bearing is a static ring and is fixed on the shell. Therefore, the bearing outer ring of the gear needs to be fixed through the shell, and meanwhile, the structure is needed to limit the axial direction of the bearing outer ring, so that the bearing is prevented from axially moving in the shell. In consideration of the overall size of the electronic brake booster, the limitation of the mounting space on the vehicle, the sealing performance of the housing, and the production cost, in order to improve the practicability and facilitate mass production, the size of the gear bearing assembly needs to be reduced as much as possible.

The existing installation mode of the inner ring of the bearing is that a gear and the bearing are respectively sleeved on a shaft, and the axial limit usually adopts a shaft shoulder, a sleeve, a check ring, a nut and the like; the mounting mode of the bearing outer ring is that the bearing is mounted on the shell, the bearing cover and the sealing element are additionally arranged on the shell, and the bearing cover and the shell are fixed by screws, so that the axial length of the assembly is increased, and the production cost is also increased. Considering the overall size of the electric brake booster, the limitation of installation space and the amount of cost, it is necessary to reduce the size of the gear bearing assembly as much as possible. Therefore, an axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake power assisting device is provided.

Disclosure of Invention

The invention provides an axial limiting method for inner and outer rings of a gear bearing of an electronic brake booster device, which aims to overcome the defects of installation space limitation, overlong size and the like in the prior art. The axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake power assisting device has the characteristics of no limitation on installation space, proper size and the like.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an electronic braking booster unit gear bearing inner and outer lane axial spacing method, includes gear and casing, be provided with internal spline and gear spoke on the gear, the casing is provided with outward to the gear, third recess and fourth recess on the casing, and the casing comprises casing inner chamber and casing outside, be equipped with the hollow shaft in the casing, the hollow shaft comprises first shaft segment, second shaft segment, shaft shoulder, riveting turn-ups, first recess and second recess, seted up the circular slot on the lateral wall of one side of installation hollow shaft on the gear, install the bearing on the hollow shaft, partly sinking in the circular slot of bearing, install the flange face on the bearing, the gear overcoat is equipped with the bearing housing, be equipped with first turn-ups, bearing housing first curb plate, bearing housing second curb plate and second turn-ups on the bearing housing.

Preferably, the gear is an injection molded part, and the wall thickness is as uniform as possible everywhere, and sufficient strength is ensured while saving material.

Preferably, the hollow shaft is manufactured into a structure beneficial to pre-embedding, and the shaft shoulder is slightly higher than the second shaft section by about 0.5mm so as to avoid the contact of the second shaft section and the bearing outer ring and increase the friction power loss.

Preferably, 4-8 first grooves need to be machined on the riveting flanging on the hollow shaft, or the slots are simply cut without removing materials, so that stress concentration and shaft deformation are reduced during riveting, and riveting pressure is reduced.

Preferably, the shaft shoulder of the hollow shaft contacting the end face of the bearing inner ring protrudes by a height difference of about 0.5mm compared with the circular groove subtracted from the gear, that is, the end face of the second shaft section is flush with the bottom surface of the circular groove, so as to avoid the contact between the gear and the bearing outer ring, and increase the friction power loss.

An axial limiting method for an inner ring and an outer ring of a gear bearing of an electronic brake booster device comprises the following steps:

s1: firstly, a hollow shaft is pre-embedded in an injection molding gear after being processed in advance;

s2: then, one end of the bearing inner ring limits the bearing to move towards the A + direction through a shaft shoulder of the hollow shaft, the other end rivets, presses and turns over the hollow shaft to limit the bearing to move towards the A-direction, and meanwhile, the end face of the bearing is ensured not to be contacted with other parts except the axial limiting structure;

s3: subsequently, the hollow shaft is provided with a plurality of first grooves at the flanging position when the flanging is riveted, so that the stress concentration during the flanging can be reduced, and the riveting is more labor-saving.

S4: moreover, the shell is in clearance fit with the bearing outer ring through a flange surface, and the bearing sleeve is in small interference fit with the bearing outer ring.

S5: after the gear, the bearing inner ring and the hollow shaft are assembled, the assembly is arranged on the shell, then the bearing is sleeved on the bearing, and the upper end face of the third groove of the shell is in contact with the flange face of the bearing, so that the bearing is limited to move towards the A-direction; the lower end face of the third groove of the shell is in contact with the upper end face of the first flanging of the bearing sleeve, the bearing is limited to move towards the A + direction, and the two structures are combined to limit the axial movement of the outer ring of the bearing.

S6: the dustproof cover is additionally arranged at the second side plate of the bearing sleeve at the lower end of the bearing sleeve, so that a certain sealing effect can be achieved on the mechanism.

Compared with the prior art, the invention has the beneficial effects that:

1. in the invention, the axial length of the gear bearing is shortened, the use of other parts on the shaft is reduced, the space utilization rate is improved, the mechanism is more compact, meanwhile, the practicability of the structure is improved in order to reduce the production cost, and the mass production is facilitated.

2. According to the invention, through the assembly mode of the hollow shaft and the gear and the mode of limiting the two ends of the inner ring and the outer ring of the bearing, the axial movement of the inner ring and the outer ring of the bearing is limited, the axial length of the assembly is greatly shortened, the application of other parts on the shaft is reduced, and the mechanism is more compact.

3. In the invention, the design of the groove at the flanging part further reduces the stress concentration and deformation of the shaft and reduces the riveting force.

4. In the invention, the small end of the bearing sleeve is used for installing a dust cover to play a certain sealing role.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a schematic view of the gear of the present invention;

FIG. 3 is a schematic structural view of the housing of the present invention;

FIG. 4 is a schematic structural view of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is a schematic view of the inner ring structure of FIG. 1;

FIG. 7 is a cross-sectional view of the present invention;

fig. 8 is a schematic view of the structure of the outer ring of fig. 1.

Reference numbers in the figures: 1. a gear; 11. an internal spline; 12. gear spokes; 13. a circular groove; 2. a bearing; 21. a flange face; 3. a hollow shaft; 31. a first shaft section; 32. a second shaft section; 33. a shaft shoulder; 34. riveting and flanging; 341. a first groove; 342. a second groove; 4. a housing; 41. a third groove; 42. a fourth groove; 5. a bearing housing; 51. a first flanging; 52. a bearing bush first side plate; 53. a bearing housing second side plate; 54. second flanging; 6. an inner cavity of the shell; 7. outside the housing

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides a technical solution: a method for axially limiting an inner ring and an outer ring of a gear bearing of an electronic brake booster comprises a gear 1 and a shell 4, wherein the gear 1 is an injection molding part, the wall thickness of each part is uniform as much as possible, sufficient strength is guaranteed while materials are saved, an internal spline 11 and a gear spoke 12 are arranged on the gear 1, the shell 4 is arranged outside the gear 1, a third groove 41 and a fourth groove 42 are arranged on the shell 4, the shell 4 consists of a shell inner cavity 6 and a shell outer part 7, a hollow shaft 3 is arranged in the shell 4, the hollow shaft 3 consists of a first shaft section 31, a second shaft section 32, a shaft shoulder 33, a riveting flanging 34, a first groove 341 and a second groove 342, one end of the hollow shaft 3 is made into a structure beneficial to embedding, the shaft shoulder 33 is slightly higher than the second shaft section 32 by about 0.5mm so as to avoid the contact between the second shaft section 32 and the outer ring of the bearing 2, the friction power loss is increased, 4-8 first grooves 341 are processed on, or simply cutting the slot without removing the material is sufficient, which is beneficial to reducing the stress concentration and the deformation of the shaft during riveting and reducing the riveting pressure, the circular groove 13 is formed on the side wall of one side of the gear 1 where the hollow shaft 3 is installed, the bearing 2 is installed on the hollow shaft 3, one part of the bearing 2 sinks into the circular groove 13 to reduce the axial length, the flange surface 21 is installed on the bearing 2, the bearing sleeve 5 is sleeved outside the gear 1, the bearing sleeve 5 is provided with the first flanging 51, the first side plate 52 of the bearing sleeve, the second side plate 53 of the bearing sleeve and the second flanging 54, the shoulder 33 of the hollow shaft 3, which is in end face contact with the inner ring of the bearing 2, protrudes by about 0.5mm than the circular groove 13 subtracted from the gear 1, namely, the end face of the second shaft section 32 is flush with the bottom face of the circular groove 13, so as to avoid the contact between the gear 1 and the.

s1: firstly, a hollow shaft 3 is pre-processed in advance and then is pre-embedded in an injection molding gear 1;

s2: then, one end of the inner ring of the bearing 2 limits the bearing 2 to move towards the A + direction through the shaft shoulder 33 of the hollow shaft 3, the other end rivets the hollow shaft 3 to press the flanging 342 to limit the bearing 2 to move towards the A-direction, and meanwhile, the end face of the bearing 2 is ensured not to be contacted with other parts except the axial limiting structure;

s3: subsequently, the hollow shaft 3 is provided with a plurality of first grooves 341 at the position of the riveting flanging 34, which can reduce the stress concentration during flanging and make the riveting more labor-saving.

S4: furthermore, the body 4 is in clearance fit with the outer ring of the bearing 2 through the flange surface 21, and the bearing sleeve 5 is in small interference fit with the outer ring of the bearing 2.

S5: after the gear 1, the inner ring of the bearing 2 and the hollow shaft 3 are assembled, the assembly is arranged on the shell 4, then the bearing sleeve 5 is pressed on the bearing 2, and the upper end surface of the third groove 41 of the shell 4 is contacted with the flange surface 21 of the bearing 2, so that the bearing 2 is limited to move towards the A-direction; the lower end face of the third groove 41 of the housing 4 contacts with the upper end face of the first flange 51 of the bearing sleeve 5, so that the bearing 2 is limited to move towards the A + direction, and the two structures are combined to limit the axial movement of the outer ring of the bearing 2.

S6: and a dust cover is additionally arranged at the second side plate 53 of the bearing sleeve at the lower end of the bearing sleeve 5, so that a certain sealing effect on the mechanism can be achieved.

Examples

As shown in fig. 2, the gear 1 is an injection molded part, and the gear spoke 12 is formed in the shape shown in the drawing in order to make the wall thickness as uniform as possible and to ensure sufficient strength while saving material.

As shown in fig. 3, the gear 1 has a non-standard internal spline 11 in the middle, which is intended to cooperate with another axial part having an external spline, so that the shaft there needs to be made as a hollow shaft.

As shown in fig. 4 and 5, one end of the hollow shaft 3 is made into a structure beneficial to pre-embedding, and the shaft shoulder 33 is slightly higher than the second shaft section 32 by about 0.5mm, so as to avoid the contact between the shaft shoulder 33 of the second shaft section 32 and the outer ring of the bearing 2, thereby increasing the friction power loss.

Referring to fig. 1 and 3, one end of the inner ring of the bearing 2 limits the bearing 2 from moving towards the direction a + through a shaft shoulder 33, and the other end limits the bearing 2 from moving towards the direction a-through riveting and flanging 34 the hollow shaft 3, so that the length of the second shaft section 32 matched with the inner ring of the bearing 2 is longer than that of the bearing 2.

As shown in fig. 1, 3 and 6, 4-8 first grooves 341 are processed on the riveting flanging 34 on one circle of shaft of the hollow shaft needing 3 flanging, or the hollow shaft is simply cut with a slit without removing materials, so that stress concentration and shaft deformation are reduced during riveting, riveting pressure is reduced, and the shape after riveting is from the first grooves 341 to the second grooves 342.

In order to reduce the axial length of the assembly, as shown in fig. 4, the end of the gear 1 on which the hollow shaft 3 is mounted may be formed with a circular groove 13 to free the bearing 2, as shown at 13.

Referring to fig. 4 and 5, the hollow shaft 3 is pre-embedded in the gear 1, and to ensure that the hollow shaft 3 is injection-molded on a part, the second shoulder 33 of the hollow shaft 3 contacting with the end surface of the inner ring of the bearing 2 protrudes by a height difference of about 0.5mm than the circular groove 13 subtracted from the gear 1, that is, the end surface of the second shaft section 32 is flush with the bottom surface of the circular groove 13, so as to avoid the contact between the gear 1 and the outer ring of the bearing 2, and increase the friction power loss.

As shown in fig. 7, the gear 1 may also be a metal part, and its connection with the hollow shaft 3 is changed to interference connection for saving material and facilitating processing, and the rest is unchanged.

As shown in fig. 8, the housing 4 is a stamping part or a casting part, in order to simplify the processing procedure, a bearing mounting hole is directly drilled on the housing 4, the bearing sleeve 5 is a stamping part, one end of the bearing sleeve is made into a first side plate 52 of the structural bearing sleeve in interference fit with the outer ring of the bearing, and is designed with a first flange 51 capable of limiting the axial movement of the outer ring of the bearing, dust covers are added at a second side plate 53 and a second flange 54 of the bearing sleeve 5 of the bearing sleeve to play a certain sealing role for the mechanism, the other end of the bearing sleeve 5 is made into a second side plate 53 of the structural bearing sleeve and a second flange 54 for installing the dust covers, the second flange 54 is used for preventing the dust covers from falling off, the upper end surface of the third groove 41 of the housing 4 is in contact with the flange surface 21 of the bearing 2 to limit the movement of the bearing 2 in the a-direction, the lower end surface of the third groove 41 of the, the bearing 2 is limited to move towards the A-direction, the axial movement of the outer ring of the bearing is limited, rubber dust covers are additionally arranged at the second side plate 53 and the second flanging 54 of the bearing sleeve at the lower end of the bearing sleeve 5, a certain sealing effect is achieved on the mechanism, the fourth groove 42 of the shell 5 can be omitted or can be inwards concave or outwards convex, the arrangement can be determined according to the installation position, the space layout and the like of the mechanism, and the bearing 2 can be a flange bearing or a bearing with a stopping groove and a stopping ring.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an outer lane axial spacing method in electronic braking booster unit gear bearing, includes gear (1) and casing (4), its characterized in that: the gear (1) is provided with an internal spline (11) and a gear spoke (12), a shell (4) is arranged outside the gear (1), a third groove (41) and a fourth groove (42) are formed in the shell (4), the shell (4) is composed of a shell inner cavity (6) and a shell outer part (7), a hollow shaft (3) is arranged in the shell (4), the hollow shaft (3) is composed of a first shaft section (31), a second shaft section (32), a shaft shoulder (33), a riveting flanging (34), a first groove (341) and a second groove (342), a circular groove (13) is formed in the side wall of one side of the gear (1) where the hollow shaft (3) is installed, a bearing (2) is installed on the hollow shaft (3), one part of the bearing (2) sinks into the circular groove (13), a flange face (21) is installed on the bearing (2), and a bearing sleeve (5) is sleeved outside the gear (1), the bearing sleeve (5) is provided with a first flanging (51), a first bearing sleeve side plate (52), a second bearing sleeve side plate (53) and a second flanging (54).

2. The axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake booster device according to claim 1, characterized in that: the gear (1) is an injection molding piece, the wall thickness of each part is uniform as much as possible, and sufficient strength is guaranteed while materials are saved.

3. The axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake booster device according to claim 1, characterized in that: one end of the hollow shaft (3) is made into a structure beneficial to pre-embedding, and the shaft shoulder (33) is slightly higher than the second shaft section (32) by about 0.5mm so as to avoid the contact of the second shaft section (32) and the outer ring of the bearing (2), thereby increasing the friction power loss.

4. The axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake booster device according to claim 1, characterized in that: 4-8 first grooves (341) are processed on the riveting flanging (34) on the hollow shaft (3), or the slots are simply cut without removing materials, so that stress concentration and shaft deformation are reduced during riveting, and riveting pressure is reduced.

5. The axial limiting method for the inner ring and the outer ring of the gear bearing of the electronic brake booster device according to claim 1, characterized in that: and a shaft shoulder (33) of the hollow shaft (3) in contact with the end face of the inner ring of the bearing (2) protrudes by a height difference of about 0.5mm compared with the circular groove (13) subtracted from the gear (1), namely, the end face of the second shaft section (32) is flush with the bottom surface of the circular groove (13) so as to avoid the contact of the gear (1) and the outer ring of the bearing (2) and increase the friction power loss.

6. The method for axially limiting the inner ring and the outer ring of the gear bearing of the electronic brake booster device according to any one of claims 1 to 5, characterized by comprising the following steps of:

s1: firstly, a hollow shaft (3) is pre-embedded in an injection molding gear (1) after being processed in advance;

s2: then, one end of the inner ring of the bearing (2) limits the bearing (2) to move towards the A + direction through a shaft shoulder (33) of the hollow shaft (3), the other end rivets and turns over a flange (342) of the hollow shaft (3) to limit the bearing (2) to move towards the A-direction, and meanwhile, the end face of the bearing (2) is ensured not to be contacted with other parts except for an axial limiting structure;

s3: subsequently, the hollow shaft (3) is provided with a plurality of first grooves (341) at the flanging position when the flanging (34) is riveted, so that the stress concentration during flanging can be reduced, and the riveting is more labor-saving.

S4: furthermore, the shell (4) is in clearance fit with the outer ring of the bearing (2) through the flange surface (21), and the bearing sleeve (5) is in small clearance fit with the outer ring of the bearing (2).

S5: after the gear (1), the inner ring of the bearing (2) and the hollow shaft (3) are assembled, the assembly is arranged on the shell (4), then the bearing sleeve (5) is pressed on the bearing (2), and the upper end surface of a third groove (41) of the shell (4) is contacted with a flange surface (21) of the bearing (2), so that the bearing (2) is limited to move towards the A-direction; the lower end face of the third groove (41) of the shell (4) is in contact with the upper end face of the first flanging (51) of the bearing sleeve (5), so that the bearing (2) is limited to move towards the A + direction, and the two structures are combined to limit the axial movement of the outer ring of the bearing (2).

S6: a dust cover is additionally arranged at the second side plate (53) of the bearing sleeve at the lower end of the bearing sleeve (5), so that a certain sealing effect on the mechanism can be achieved.