CN111059175A - Machining method of drum brake and drum brake - Google Patents
Machining method of drum brake and drum brake Download PDFInfo
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- CN111059175A CN111059175A CN201911260016.5A CN201911260016A CN111059175A CN 111059175 A CN111059175 A CN 111059175A CN 201911260016 A CN201911260016 A CN 201911260016A CN 111059175 A CN111059175 A CN 111059175A
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- brake
- drum
- peripheral surface
- machining
- friction plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/0043—Brake maintenance and assembly, tools therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
- F16D65/09—Pivots or supporting members therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/10—Drums for externally- or internally-engaging brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D2051/001—Parts or details of drum brakes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a method for machining a drum brake and the drum brake, and belongs to the technical field of braking. The machining method of the drum brake comprises the following steps of assembling a brake bottom plate assembly: sequentially mounting a cam, a brake shoe and a friction plate on a bottom plate, wherein the friction plate is positioned on the outer side of the brake shoe; processing the friction plate: after the friction plate is fixed on the outer side of the brake shoe, the peripheral surface of the friction plate is processed; assembling a brake drum assembly: pressing a brake drum and a wheel hub, and mounting a bearing assembly on the wheel hub, wherein the bearing assembly plays a supporting role; finish machining the brake drum: finishing the inner peripheral surface of the brake drum with the bearing assembly as a reference; honing treatment: carrying out honing treatment on the inner peripheral surface of the processed brake drum to form cross reticulate patterns on the inner peripheral surface. The advantages are that: the braking torque of the two sides of the brake drum is consistent, and the braking effect is good.
Description
Technical Field
The invention relates to the technical field of braking, in particular to a drum brake and a processing method thereof.
Background
Truck and some passenger cars widely use drum brakes to perform the braking function of the car. The drum brake is a brake transmission mechanism which is used for enabling a brake shoe to press a brake friction plate on the inner side of a brake drum, so that braking force is generated, and a vehicle is braked.
However, in the existing drum brake, the peripheral surface of the friction plate is firstly processed and then riveted to the brake shoe plate; in the riveting process, the friction plates can generate deformation, so that different gaps are generated between the two friction plates and the brake shoes on the two sides respectively; when the cam rotates to push the brake shoes to open, the brake shoes on the two sides cannot contact the friction plates at the same time, so that the peripheral surfaces of the friction plates cannot rub the inner peripheral surfaces of the brake drums on the two sides at the same time, and the braking effect is poor.
Meanwhile, when the inner circumferential surface of the brake drum is turned, because the inner circumferential surface of the brake drum is subjected to finish machining by a common turning process and rotates around the central axis in the same direction, spiral tool marks in the same direction inevitably exist on the inner circumferential surface of the brake drum after machining, as shown in fig. 1. When the brake shoe is stressed and opened to push the friction plate to be in contact with the brake drum, the friction plate is influenced by the spiral tool marks, the friction plate generates lateral force with the inner circumferential surfaces of the brake drums on two sides respectively, the brake shoe generates a moving trend along the direction of the spiral tool marks, the directions of the lateral force generated in the braking process are opposite, the braking torques on two sides are inconsistent, and the braking effect is poor.
In view of the above problems, a method for manufacturing a drum brake and a drum brake are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for machining a drum brake, which is simple and has the characteristics that the braking torques on two sides are consistent and the braking effect is better.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of manufacturing a drum brake, comprising the steps of:
assembling a brake bottom plate assembly: sequentially installing a cam, a brake shoe and a friction plate on a bottom plate, wherein the friction plate is positioned on the outer side of the brake shoe, and the cam is used for pushing the brake shoe and the friction plate to move outwards;
processing the friction plate: after the friction plate is fixed on the outer side of the brake shoe, the peripheral surface of the friction plate is processed;
assembling a brake drum assembly: pressing a brake drum and a wheel hub, and mounting a bearing assembly on the wheel hub, wherein the bearing assembly plays a supporting role;
finish machining the brake drum: finishing the inner peripheral surface of the brake drum with the bearing assembly as a reference;
honing treatment: carrying out honing treatment on the inner peripheral surface of the processed brake drum to form cross reticulate patterns on the inner peripheral surface.
Preferably, the method for machining the drum brake further comprises the following steps:
assembling an assembly: assembling the brake drum assembly to an outer periphery of the brake spider assembly based on an axle assembly such that the inner circumferential surface of the brake drum is disposed opposite the outer circumferential surface of the friction plate to form a drum brake.
Preferably, the circle run-out value of the outer peripheral surface of the machined friction plate is not more than 0.15mm, the verticality is not more than 0.1mm, and the roughness is less than Ra6.3.
Preferably, the bottom plate is provided with an installation seam allowance, and the installation seam allowance is used as a reference when the outer circumferential surface of the friction plate is processed.
Preferably, the cross-hatching formed by the inner peripheral surface has an angle of 30 ° to 55 °.
Preferably, the step of assembling the brake drum assembly further comprises the steps of:
roughly machining the brake drum: and roughly machining the inner peripheral surface of the brake drum, wherein a machining allowance of 0.6mm needs to be reserved on the inner peripheral surface after rough machining.
Preferably, the inner circumferential surface of the brake drum is finished, and a machining allowance of 0.1mm-0.2mm is reserved.
Preferably, the roughness of the inner peripheral surface after the honing treatment is Ra0.6-Ra0.9, the cylindricity is less than 0.025mm, the end face circle run-out value relative to the bearing assembly is less than 0.12mm, and the end face full run-out value is less than 0.2 mm.
Preferably, in the step of assembling the brake drum assembly, the brake drum and the hub are press-fitted by a tire bolt.
The invention also aims to provide a drum brake which has the characteristics of consistent braking torque on two sides and better braking effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a drum brake is manufactured by adopting the processing method of the drum brake.
The invention has the beneficial effects that:
the invention provides a machining method of a drum brake and the drum brake. According to the processing method of the drum brake, the friction plate is fixed on the outer side of the brake shoe plate, and then the peripheral surface of the friction plate is processed, so that the problem that the friction plate is deformed when being processed and then installed on the brake shoe plate is solved; after the friction plates are installed, the friction plates are processed, deformation of the friction plates is avoided, gaps are avoided between the two friction plates and the brake shoes on the two sides, when the cam rotates to push the brake shoes to open, the brake shoes on the two sides can simultaneously contact the friction plates, the outer peripheral surfaces of the friction plates can simultaneously rub the inner peripheral surfaces of the brake drums on the two sides, and the braking effect is good; meanwhile, the bearing assembly is used as a reference, the inner circumferential surface of the brake drum is subjected to finish machining and then subjected to honing treatment, so that cross-hatches are formed on the inner circumferential surface of the brake drum, the braking torques on two sides of the brake drum are consistent, and the braking effect is good.
Drawings
FIG. 1 is a schematic structural view of an inner circumferential surface of a brake drum in the prior art;
FIG. 2 is a schematic flow chart of a method of manufacturing a drum brake according to the present invention;
FIG. 3 is a schematic structural view of the inner circumferential surface of the brake drum according to the present invention;
FIG. 4 is a schematic structural view of a brake spider assembly provided by the present invention;
FIG. 5 is a schematic structural view of a brake drum provided in the present invention;
FIG. 6 is a schematic structural view of a brake drum assembly provided by the present invention.
Description of reference numerals:
in the figure:
1-a brake shoe assembly;
11-brake shoes; 12-a base plate; 13-a cam; 14-a return spring;
15-friction plate; 151-outer peripheral surface;
16-a hoof plate shaft; 17-shoe shaft spring;
2-a brake drum assembly;
21-a brake drum; 211-inner peripheral surface; 2111-cross hatch;
212-reinforcing ribs; 213-outer side; 214-bolt hole; 215-hub abutment surface; 216-bolt mounting face;
22-a hub; 23-tire bolts; 24-a first bearing; 25-second bearing.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features. Like reference numerals refer to like elements throughout the specification.
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the embodiment, a method of machining a drum brake, and a drum brake manufactured by the method of machining a drum brake for braking an automobile are proposed. Wherein the drum brake comprises a bridge assembly. The axle assembly comprises a front axle and a rear axle, wherein the front axle is a connecting part of two wheels in front of the automobile and is used for braking the front half part of the automobile; the rear axle is a connecting part of two wheels at the rear of the automobile and is used for braking the rear half part of the automobile.
Specifically, as shown in fig. 2, the method for machining the drum brake includes the steps of: assembling a brake bottom plate assembly 1: sequentially installing a cam 13, a brake shoe 11 and a friction plate 15 on the bottom plate 12, wherein the friction plate 15 is positioned on the outer side of the brake shoe 11, and the cam 13 is used for pushing the brake shoe 11 and the friction plate 15 to move outwards; machining the friction plate 15: after the friction plate 15 is fixed to the outer side of the brake shoe 11, the outer peripheral surface 151 of the friction plate 15 is processed; assembling the brake drum assembly 2: pressing the brake drum 21 and the wheel hub 22, and mounting a bearing assembly on the wheel hub 22, wherein the bearing assembly plays a supporting role; finish machining brake drum 21: finishing the inner peripheral surface 211 of the brake drum 21 with reference to the bearing assembly; honing treatment: the inner peripheral surface 211 of the brake drum 21 after machining is subjected to honing treatment to form crosswebs 2111 in the inner peripheral surface 211, as shown in fig. 3.
In the present embodiment, the cross webs 2111 formed by the inner peripheral surface 211 have an angle of 30 ° to 55 °. The angle of the cross reticulate pattern 2111 is processed to be 30-55 degrees, spiral tool marks on the inner circumferential surface 211 of the brake drum 21 after finishing processing can be eliminated better, the consistency of braking torque on two sides of the brake drum 21 is better, and the braking effect is better.
Further, as shown in fig. 2, the method for machining the drum brake further includes the steps of: assembling an assembly: the brake drum assembly 2 is assembled to the outer periphery of the brake spider assembly 1 based on the axle assembly, with the inner peripheral surface 211 of the brake drum 21 disposed opposite the outer peripheral surface 151 of the friction plate 15, to form a drum brake. In the present embodiment, in the step of assembling the assembly, the braking gap between the brake shoe assembly 1 and the brake drum assembly 2 is required to be 0.7mm to 1.0 mm.
When the brake pedal is stepped on, compressed air in the air tank enters a brake air chamber, so that the cam 13 rotates to drive the brake shoe 11 and the friction plate 15 to be pressed outwards against the brake drum 21, and the friction plate 15 and the brake drum 21 are contacted with each other to generate friction so as to generate a braking action; when the brake pedal is released, the brake shoe 11 is returned by the return spring 14, so that the friction plate 15 is separated from the brake drum 21, and the brake is released.
The friction plate 15 is fixed on the outer side of the brake shoe 11, and then the peripheral surface 151 of the friction plate 15 is processed, so that the problem that the friction plate 15 is deformed when the friction plate 15 is processed and then installed on the brake shoe 11 is solved; after the friction plates 15 are installed, the friction plates 15 are processed, so that no deformation occurs in the friction plates 15, and no gap is generated between each of the two friction plates 15 and the brake shoes 11 on the two sides, so that when the cam 13 rotates to push the brake shoes 11 to open, the brake shoes 11 on the two sides can simultaneously contact the friction plates 15, and the outer peripheral surfaces 151 of the friction plates 15 can simultaneously generate friction with the inner peripheral surfaces 211 of the brake drums 21 on the two sides, so that the braking effect is good. And the friction plates 15 are installed and then processed, so that the friction plates 15 on the two sides can be ensured to be arranged symmetrically all the time, and the friction force generated by the friction plates and the inner circumferential surfaces 211 of the brake drums 21 on the two sides in an abutting mode is the same, and the braking effect is better.
Meanwhile, the inner circumferential surface 211 of the brake drum 21 is subjected to finish machining and then to honing treatment by taking the bearing assembly as a reference, and spiral tool marks remained on the inner circumferential surface 211 of the brake drum 21 caused during finish machining can be eliminated through the honing treatment, so that the inner circumferential surface 211 of the brake drum 21 forms a cross-hatch 2111; when the cam 13 rotates to push the brake shoe 11 to open so as to drive the friction plate 15 to contact with the brake drum 21, because the spiral tool marks are eliminated, the friction plate 15 and the inner circumferential surface 211 of the brake drum 21 on both sides generate lateral forces in the same direction, so that the braking torques on both sides of the brake drum 21 are consistent, and the braking effect is good. In this embodiment, the bearing assembly includes a first bearing 24 and a second bearing 25, both the first bearing 24 and the second bearing 25 being mounted on the hub 22.
Specifically, as shown in fig. 4, in the step of assembling the brake shoe assembly 1, the following steps are further included: a return spring 14, a shoe axle 16 and a shoe axle spring 17 are mounted to the base plate 12. The return spring 14 is used for driving the brake shoe 11 to return to an initial position before being pushed away; the shoe shaft 16 is used for fixing the brake shoe 11 on the bottom plate 12, and the brake shoe 11 can rotate relative to the shoe shaft 16; the shoe axle spring 17 is used to adjust the position of the both-side brake shoes 11. Since the installation process of the return spring 14, the shoe shaft 16 and the shoe shaft spring 17 in the drum brake is prior art, detailed description thereof is omitted.
Further, the bottom plate 12 is provided with a mounting boss (not shown), and when the outer peripheral surface 151 of the friction plate 15 is machined, the machining accuracy can be made high with the mounting boss as a reference. In this embodiment, the outer circumferential surface 151 of the friction plate 15 is machined by turning. The position precision of the whole peripheral surface 151 of the friction plate 15 can be guaranteed to be the same and better by adopting an integral turning mode, so that the circle run-out value, the verticality and the roughness of the peripheral surface 151 can reach required values. Specifically, in this embodiment, the circle run-out value of the outer peripheral surface 151 of the friction plate 15 after turning is required to be not more than 0.15mm, the perpendicularity is required to be not more than 0.1mm, and the roughness is required to be less than ra 6.3.
Further, before the step of assembling the brake drum assembly 2, the method further comprises the following steps: rough machining of the brake drum 21: in addition to roughing the inner peripheral surface 211 of the brake drum 21, as shown in fig. 5, the method further includes machining a hub contact surface 215, bolt holes 214, bolt attachment surfaces 216, ribs 212, an outer side surface 213, and an end surface (not shown) in this order on the brake drum 21 so that the brake drum 21 and the hub 22 can be smoothly press-fitted. In the present embodiment, as shown in fig. 6, the brake drum 21 and the hub 22 are press-fitted by the tire bolts 23. The tire bolt 23 has high strength, can bear the connection of the torsion between the brake drum 21 and the hub 22, is not easy to break, and has good connection effect. After rough machining, a machining allowance of 0.6mm needs to be reserved on the inner peripheral surface 211 so as to carry out finish machining on the inner peripheral surface 211 of the brake drum 21; and after the inner peripheral surface 211 of the brake drum 21 is finished, a machining allowance of 0.1mm-0.2mm needs to be reserved so as to carry out honing treatment on the inner peripheral surface 211 of the brake drum 21.
In the present embodiment, turning is employed for both rough machining and finish machining of the inner peripheral surface 211 of the brake drum 21. The turning mode can ensure that the position precision on the whole inner peripheral surface 211 of the brake drum 21 is the same and better, so as to ensure that the roughness, the cylindricity, the end face circle run-out value and the end face full run-out value of the inner peripheral surface 211 of the brake drum 21 after the honing treatment can reach the required values. Specifically, in the present embodiment, the inner peripheral surface 211 after the honing process has a roughness of ra0.6 to ra0.9, a cylindricity of less than 0.025mm, a face circle run-out value of less than 0.12mm with respect to the bearing assembly, and a full run-out value of less than 0.2 mm. In the present embodiment, the honing machine is used to perform honing processing on the inner peripheral surface 211 of the brake drum 21. The honing machine is used for honing, the honing operation is simple, the honing effect is good, and the reliability is high.
In other embodiments, after the step of finishing the brake drum 21, a finishing process may be added to the brake drum 21 again to eliminate the spiral tool marks on the inner circumferential surface 211 of the first finishing brake drum 21 instead of the honing process, so that cross webs 2111 are formed on the inner circumferential surface 211 to make the braking torques on both sides of the brake drum 21 uniform. During the second finish machining of the brake drum 21, a reverse tool and a machining device are needed to perform reverse rotation of the main shaft, and meanwhile, a reasonable radial feed amount is set to machine the cross webbing 2111. The specific processing equipment and the radial feeding amount need to be determined according to actual processing conditions and processing requirements.
The specific processing procedure of the processing method of the drum brake in the embodiment is as follows: as shown in fig. 2, first, the cam 13, the brake shoe 11, the return spring 14, the shoe shaft 16, the shoe shaft spring 17, and the friction plate 15 are assembled to the base plate 12 in this order to form the brake base plate assembly 1, and then the outer peripheral surface 151 of the friction plate 15 is turned integrally with reference to the fitting spigot on the base plate 12.
Then, a hub joint surface 215, bolt holes 214, bolt mounting surfaces 216, reinforcing ribs 212, an outer side surface 213 and an end surface are sequentially machined on the brake drum 21, turning and rough machining is carried out on the inner circumferential surface 211 of the brake drum 21, and a machining allowance of 0.6mm is reserved on the inner circumferential surface 211; press-fitting the brake drum 21 and the hub 22 after rough machining through the tire bolts 23, and mounting the first bearing 24 and the second bearing 25 on the hub 22 to form the brake drum assembly 2; turning and finish machining the inner circumferential surface 211 of the brake drum 21 by taking the first bearing 24 and the second bearing 25 as references, and reserving a machining allowance of 0.1mm-0.2mm on the inner circumferential surface 211; and honing the inner circumferential surface 211 of the finished brake drum 21 by using the first bearing 24 and the second bearing 25 as reference, so that a cross net 2111 with an angle of 30-55 degrees is formed on the inner circumferential surface 211 of the brake drum 21.
Finally, the brake drum assembly 2 is assembled to the outer periphery of the brake spider assembly 1 such that the inner peripheral surface 211 of the brake drum 21 is disposed opposite to the outer peripheral surface 151 of the friction plate 15; and assembling the assembled brake drum assembly 2 and the brake bottom plate assembly 1 on a bridge assembly to form a drum brake with a brake clearance of 0.7-1.0 mm so as to complete the whole machining process.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A method of manufacturing a drum brake, comprising the steps of:
assembling a brake shoe assembly (1): sequentially installing a cam (13), a brake shoe (11) and a friction plate (15) on a bottom plate (12), wherein the friction plate (15) is positioned on the outer side of the brake shoe (11), and the cam (13) is used for pushing the brake shoe (11) and the friction plate (15) to move outwards;
machining the friction plate (15): fixing the friction plate (15) on the outer side of the brake shoe (11), and then processing the outer peripheral surface (151) of the friction plate (15);
assembling the brake drum assembly (2): pressing a brake drum (21) and a wheel hub (22) and mounting a bearing assembly on the wheel hub (22), wherein the bearing assembly plays a supporting role;
finishing the brake drum (21): finishing an inner peripheral surface (211) of the brake drum (21) with the bearing assembly as a reference;
honing treatment: honing the inner peripheral surface (211) of the brake drum (21) after machining to form cross-hatching (2111) on the inner peripheral surface (211).
2. A method of manufacturing a drum brake according to claim 1, characterised in that the method of manufacturing a drum brake further comprises the steps of:
assembling an assembly: -fitting the brake drum assembly (2) to the outer periphery of the brake spider assembly (1) based on an axle assembly, with the inner circumferential surface (211) of the brake drum (21) disposed opposite the outer circumferential surface (151) of the friction plate (15) to form a drum brake.
3. A method of machining a drum brake according to claim 1 in which the circular runout value of the outer peripheral surface (151) of the friction plate (15) after machining is not more than 0.15mm, the perpendicularity is not more than 0.1mm, and the roughness is less than ra 6.3.
4. A method of machining a drum brake according to claim 1, characterized in that a mounting spigot is provided on the base plate (12), and the mounting spigot is used as a reference when machining the outer peripheral surface (151) of the friction plate (15).
5. A method of manufacturing a drum brake according to claim 1, characterized in that said cross hatching (2111) formed by said inner peripheral surface (211) is at an angle of 30 ° to 55 °.
6. A method of manufacturing a drum brake according to claim 1, characterized by the further step of, before said step of assembling the brake drum assembly (2),:
roughing the brake drum (21): roughly machining the inner peripheral surface (211) of the brake drum (21), and reserving a machining allowance of 0.6mm on the inner peripheral surface (211) after rough machining.
7. A method of manufacturing a drum brake according to claim 1, characterized in that a machining allowance of 0.1mm-0.2mm is reserved for the inner circumferential surface (211) of the brake drum (21) after finishing.
8. A method of machining a drum brake according to claim 1, in which said inner peripheral surface (211) after said honing process has a roughness of ra0.6-ra0.9, a cylindricity of less than 0.025mm, a face circle run-out value of less than 0.12mm relative to said bearing assembly, and a face full run-out value of less than 0.2 mm.
9. A method of manufacturing a drum brake according to claim 1, characterized in that in said step of assembling a brake drum assembly (2), said brake drum (21) and said wheel hub (22) are press fitted by means of tire bolts (23).
10. A drum brake produced by a method of manufacturing a drum brake according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260016.5A CN111059175B (en) | 2019-12-10 | 2019-12-10 | Machining method of drum brake and drum brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260016.5A CN111059175B (en) | 2019-12-10 | 2019-12-10 | Machining method of drum brake and drum brake |
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| CN111059175A true CN111059175A (en) | 2020-04-24 |
| CN111059175B CN111059175B (en) | 2021-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045930A (en) * | 2022-06-24 | 2022-09-13 | 一汽解放汽车有限公司 | Brake manufacturing method, brake manufacturing mechanism and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115045930A (en) * | 2022-06-24 | 2022-09-13 | 一汽解放汽车有限公司 | Brake manufacturing method, brake manufacturing mechanism and vehicle |
| CN115045930B (en) * | 2022-06-24 | 2023-11-07 | 一汽解放汽车有限公司 | Brake manufacturing method, brake manufacturing mechanism, and vehicle |
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