CN104019168B - Investment casting variable cross section rotary type leaf spring - Google Patents
Investment casting variable cross section rotary type leaf spring Download PDFInfo
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- CN104019168B CN104019168B CN201410270243.7A CN201410270243A CN104019168B CN 104019168 B CN104019168 B CN 104019168B CN 201410270243 A CN201410270243 A CN 201410270243A CN 104019168 B CN104019168 B CN 104019168B
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Abstract
The invention discloses a kind of investment casting variable cross section rotary type leaf spring, described leaf spring is made up of single steel plate, overall curved, it is characterized in that, the leaf spring of integral structure comprises the steel plate body in the middle part of being in, is in the spademan at two ends and is in circular turned body three part of described steel plate body and spademan intersection; Be provided with perforation at the joint of described steel plate body and spademan, described spademan passes and turns round and forms described solid of rotation in described perforation, and described solid of rotation is on the stress surface of described leaf spring; The axis of described steel plate body and described spademan is on same camber line.The present invention, while can alleviating leaf spring weight, avoids friction, improves vehicle running smoothness.
Description
Technical field:
The present invention relates to a kind of investment casting variable cross section rotary type leaf spring, be specifically related to the leaf spring of cargo vehicle equalizing suspension mechanism.
Background technique:
At present, in truck technical field, leaf spring is still the suspension spring of extensive use.Common leaf spring is wide by some but the elastic beam of an approximately equi-strength that combines of the Steel Spring Plate of Length discrepancy.This traditional leaf spring weight is larger.Meanwhile, owing to being the cause superposed by multi-disc steel plate, thus cause automobile in the process of moving steel plate deform, make between steel plate and steel plate, to form larger surface friction drag, this surface friction drag can make the rigidity of spring sharply increase, and even occurs deadlock phenomenon, causes the smoothness of automobile to degenerate.There are some researches show: when Steel Spring Plate operates under the amplitude of assembly is 1mm condition, few-leaf-spring dynamic stiffness is by increase by 2.5 times, and Multi-Leaf Springs will increase nearly 7 times.In addition, while steel interleaf friction, also can produce noise, reduce the travelling comfort of driving.
In existing technology, partial automobile use few-leaf-spring, but due to this steel plate Forging Technology comparatively complicated, cost is higher, and less producer is adopted, and most of truck still uses conventional steel plates spring in the market.For rotary structure part, the method for forging and stamping is utilized to realize.Along with foundry engieering, the development of especially special casting process technology, the performance of foundry goods is constantly promoting, and replaces forging to apply in load-bearing member with foundry goods.
Summary of the invention:
For overcoming the defect of prior art, the object of the present invention is to provide a kind of investment casting variable cross section rotary type leaf spring, while leaf spring weight can be alleviated, avoiding friction, improve vehicle running smoothness.
Technical solution problem of the present invention adopts following technological scheme:
Investment casting variable cross section rotary type leaf spring, described leaf spring is made up of single steel plate, overall curved, it is characterized in that, the leaf spring of integral structure comprises the steel plate body in the middle part of being in, is in the spademan at two ends and is in circular turned body three part of described steel plate body and spademan intersection;
Be provided with perforation at the joint of described steel plate body and spademan, described spademan passes and turns round and forms described solid of rotation in described perforation, and described solid of rotation is on the stress surface of described leaf spring; The axis of described steel plate body and described spademan is on same camber line.
From the thickness direction of steel plate, the middle part of described steel plate body has one section for plane, its objective is convenient steel plate spring clamping in suspension systems.Thinning gradually along arc direction from the steel plate at tail end thickness of the two ends to two of a described plane spademan.The varied in thickness of steel plate body and spademan changes according to parabola rule, and circular turned body to divide be uniform thickness.
The width being provided with the sheet steel sections of described perforation wider than the width of described steel plate body and described spademan, to ensure the intensity of site of perforation steel plate.
Be in the spademan at two ends and two solid of rotation to be centrosymmetric distribution with the center of described steel plate body respectively.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention adopts single steel plate to form, and assembly is approximately an equicohesive elastic beam.Leaf spring maximum ga(u)ge place thickness is identical, then the end of a spademan from centre to two, and steel plate thickness is thinning gradually along arc direction, and varied in thickness changes according to parabola rule.Parabolically bending to make leaf spring each cross section upper stress equal, can saving resource, weight reduction to the full extent.
The centre distance of this leaf spring both sides rotary structure is about 1/2 of this leaf spring length; Inside solid of rotation circular diameter be this leaf spring length 6% ~ 9% between; Concrete size is advisable to meet leaf spring specific performance.
Single steel plate meets requirement of strength, but rigidity is too large, can not use in the car as elastic element separately.The present invention adopts rotary structure in the steel plate left and right sides, and this structure makes leaf spring in loading process, have enough elasticity.
Consider the complexity of rotary structure, described leaf spring can adopt the method for investment casting to produce, and obtaining foundry goods has very high dimensional accuracy and surface finishment.
Preferably, when Foundry Production variable cross section rotary type leaf spring, adopt refractory ceramics core, core is placed in die cavity, in order to generate rotary structure.When clearing up foundry goods, can knock and make it broken.
By adopting technique scheme, manufacture the variable cross section rotary type leaf spring of gained, dimensional accuracy is high, superior performance; Compare Multi-Leaf Springs, weight reduces more than 40%; Because this spring only has a block plate, friction and noise can not be produced in vehicle travel process; The rotary structure of spring both sides, under loading conditions, can store certain energy, to ensure that leaf spring has enough elasticity, successfully improves the smoothness of automobile.
As taken carrying capacity as the automobile front suspension of 9 tons, the rotary type variable-section steel sheet spring of the present invention's design is specifically of a size of: leaf spring length 1300mm, rotary structure centre distance 700mm, solid of rotation inside diameter is 90mm.The design's dimensional parameters meets this automotive performance requirement.The present invention with on the market for this vehicle front suspension spring compared with can find out (table 1): spring Static stiffness of the present invention, static load and dynamic load maximum stress and multi-disc spring, few flat spring difference are little, weight obviously reduces, and dynamic stiffness variable quantity is minimum.If replace existing spring with the present invention, while alleviating vehicle body deadweight, can ensure that vehicle travels smooth-going, improve and drive and riding comfort.
Table 1
Note: 1, in table, data are actual measurement optimum value; 2, the data of dynamic stiffness measured by amplitude 5mm in table;
Accompanying drawing illustrates:
Fig. 1 is stereogram of the present invention; Fig. 2 is plan view of the present invention; Fig. 3 is the A-A sectional view of Fig. 2; Fig. 4 is the I portion enlarged view of Fig. 3; Fig. 5 is variable cross section rotary type leaf spring injection system structure schematic diagram of the present invention; Fig. 6 is the working state schematic representation of variable cross section rotary type leaf spring.
Number in the figure: 1 steel plate body, 2 spademans, 3 solid of rotation, 4 perforation, 5 pouring cups, 6 sprues, 7 cross gates, 8 flow gates, 9 kidney-shaped rising heads, 10 cylindrical rising heads.
Below by way of embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment:
Embodiment: composition graphs 1-4, Fig. 6, the leaf spring of the present embodiment is made up of single steel plate, for integral type structure, overall curved, integrally-built leaf spring can be considered and is made up of three parts: be namely in the steel plate body 1 at middle part, be in two spademans 2 at two ends and be in circular turned body 3 three part of steel plate body and spademan intersection.
Perforation 4 is provided with at the joint of steel plate body and spademan, be in leaf spring both sides ability spademan pass in perforation and return the conglobate solid of rotation 3 of the structure that turns around, shown in Fig. 6, from working state, the end face of steel plate is stress surface, two ends, bottom surface are supporting surface, and described solid of rotation 3 is on the stress surface of leaf spring; And steel plate body 1 is on same camber line with the axis of the spademan 2 of both sides, namely leaf spring entirety looks curved structure.
Shown in Fig. 6, from the thickness direction of steel plate, the middle part of steel plate body has one section for plane, and from the two ends to two of plane, the steel plate at tail end thickness of a spademan is thinning gradually, and steel plate thickness change changes according to parabola rule.
Shown in Fig. 2, the width being provided with the sheet steel sections of perforation 4 is wider than the width of steel plate body and spademan, and the width of increase is with after making perforate, and the intensity of steel plate is guaranteed.
Shown in Fig. 2,3, be in the spademan at two ends and two solid of rotation and be centrosymmetric distribution with the center of steel plate body respectively.
Shown in Fig. 5 is the pouring system of leaf spring, adopt investment casting method to prepare variable-section steel sheet spring, this pouring system is made up of pouring cup 5, sprue 6, cross gate 7 and flow gate 8.Because foundry goods is carbon-steel parts, mobile performance is poor, will prevent shrinkage cavity and porosity defect in casting process, needs to settle rising head.Rising head is set to kidney-shaped rising head 9, cylindrical rising head 10.Pouring temperature 1540 DEG C, shell temperature 300 DEG C, adopts this process program, can cast out size accurate, the foundry goods of superior performance.
In the process of Foundry Production variable cross section rotary type leaf spring, need to use refractory ceramics core, core is placed in die cavity, when clearing up foundry goods, can knock and make it broken.
Figure 6 shows that the schematic diagram under variable cross section rotary type leaf spring working state, X, Y are equivalent to two strong points of vehicle bridge side supporting steel plate spring, and P is equivalent to make in the load at leaf spring.Because this leaf spring only has a block plate, friction and noise can not be produced in vehicle operation; Load p can make leaf spring bend, and the rotary structure of both sides can ensure that leaf spring has enough elasticity while having enough rigidity, successfully improves the smoothness of automobile.
Claims (4)
1. investment casting variable cross section rotary type leaf spring, described leaf spring is made up of single steel plate, overall curved, it is characterized in that, the leaf spring of integral structure comprises the steel plate body (1) in the middle part of being in, is in the spademan (2) at two ends and is in circular turned body (3) three part of described steel plate body and spademan intersection;
Be provided with bore a hole (4) at the joint of described steel plate body and spademan, described spademan passes and turns round and forms described solid of rotation (3) in described perforation, and described solid of rotation is on the stress surface of described leaf spring; The axis of described steel plate body and the axis of described spademan (2) are on same camber line.
2. investment casting variable cross section rotary type leaf spring according to claim 1, it is characterized in that, from the thickness direction of steel plate, the middle part of described steel plate body has one section for plane, thinning gradually from the steel plate at tail end thickness of the two ends to two of a described plane spademan, change according to parabola rule from the steel plate at tail end varied in thickness of the two ends to two of a described plane spademan.
3. investment casting variable cross section rotary type leaf spring according to claim 1, is characterized in that, the width being provided with the sheet steel sections of described perforation (4) is wider than the width of described steel plate body and described spademan.
4. investment casting variable cross section rotary type leaf spring according to claim 1, is characterized in that, is in the spademan at two ends and two solid of rotation and is centrosymmetric distribution with the center of described steel plate body respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270243.7A CN104019168B (en) | 2014-06-17 | 2014-06-17 | Investment casting variable cross section rotary type leaf spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410270243.7A CN104019168B (en) | 2014-06-17 | 2014-06-17 | Investment casting variable cross section rotary type leaf spring |
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| CN104019168A CN104019168A (en) | 2014-09-03 |
| CN104019168B true CN104019168B (en) | 2016-02-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060022389A1 (en) * | 2004-08-02 | 2006-02-02 | Melvin Svendsen | Leaf spring assembly with forged fastener |
| CN201013818Y (en) * | 2007-04-09 | 2008-01-30 | 王学军 | Vehicle plate spring |
| CN201487108U (en) * | 2009-08-13 | 2010-05-26 | 陕西汽车集团有限责任公司 | Improved steel plate spring of heavy-load lorry hanging frame |
| CN202301670U (en) * | 2011-10-10 | 2012-07-04 | 郑州日产汽车有限公司 | Back steel plate spring for environmental sanitation vehicle |
| CN202707886U (en) * | 2012-07-17 | 2013-01-30 | 郑州日产汽车有限公司 | Variable cross-section leaf spring for vehicles |
-
2014
- 2014-06-17 CN CN201410270243.7A patent/CN104019168B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060022389A1 (en) * | 2004-08-02 | 2006-02-02 | Melvin Svendsen | Leaf spring assembly with forged fastener |
| CN201013818Y (en) * | 2007-04-09 | 2008-01-30 | 王学军 | Vehicle plate spring |
| CN201487108U (en) * | 2009-08-13 | 2010-05-26 | 陕西汽车集团有限责任公司 | Improved steel plate spring of heavy-load lorry hanging frame |
| CN202301670U (en) * | 2011-10-10 | 2012-07-04 | 郑州日产汽车有限公司 | Back steel plate spring for environmental sanitation vehicle |
| CN202707886U (en) * | 2012-07-17 | 2013-01-30 | 郑州日产汽车有限公司 | Variable cross-section leaf spring for vehicles |
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| CN104019168A (en) | 2014-09-03 |
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