CN201245181Y - Medium-sized truck cab turnover mechanism - Google Patents

Abstract

The utility model relates to a medium-sized truck cab-tilting mechanism, which comprises supports connected with a chassis; wherein, a left torsion bar and a right torsion bar are arranged in parallel in the middles of the supports; one end of each torsion bar is extended out of the support; the extended ends of the left torsion bar and the right torsion bar are respectively connected with force arms; inclined wedge-shaped cab-mounting racks are respectively arranged on the two sides of the upper parts of the supports through a tilting shaft; both the left torsion bar and the right torsion bar are cylindrical bars; the diameters of both ends of each cylindrical bar are respectively equal to D1 and D2; and the diameter of the middle part of each cylindrical bar is equal to d, d equals to 26mm, D1 equals to 1.2d equals to 31.2mm, D2 equals to D1 plus 5 equals to 36.2mm. The tilting torque of the cab-tilting mechanism is less, so the cab-tilting operation is easier. The design method of the utility model is applicable to the tilting process of any mechanical tilting mechanism cab; only given the corresponding measured parameters of different cabs, the optimal diameters of the torsion bars can be obtained; and the method is simple and reliable.

Description

A kind of Medium Truck cab turning mechanism

Technical field

The utility model relates to the cab turning mechanism of goods carrying vehicle.

Background technology

At present, the upset of most of truck caps all need be by the mechanical type switching mechanism.This mechanism constitutes two torsion bar structures by left torsion bar and right torsion bar, the two ends of torsion bar are splines, torsion bar is connected with the support of place one side with its end separately, the other end is connected with the arm of force of a relative side, itself and support bonded assembly one end are for fixedly installing, the weight of operator's compartment acts on torsion bar is twisted, and changes into the moment of torsion of torsion bar.Operator's compartment is mounted on the operator's compartment erecting frame, can rotate around invert center.The switching process of operator's compartment is the operational torque of operating personal, the moment of torsion of torsion bar, and the coefficient result of the gravitational moment of operator's compartment.

The big state of domestic present ubiquity chaufeur actuating force in switching process can not make chaufeur easily carry out chassis member maintenance and maintenances such as driving engine.

Such as certain vehicle torsion bar diameter d=26mm of company, tilting force is very big, and maximum reaches about 400N; Later stage is adjusted torsion bar diameter d=31mm effect improvement, but has increased manufacturing cost and the heat treatment difficulty makes cost increase by 150 yuan.Annual according to 50,000 calculating, increase cost 7,500,000.

The utility model content

From the turning operation portability angle of operator's compartment, the utility model aims to provide a kind of Medium Truck cab turning mechanism light, low cost of manufacture of operating.

Concrete structural development technical scheme is as follows:

A kind of Medium Truck cab turning mechanism comprises the support that connects vehicle frame, parallel left torsion bar and the right torsion bar of being provided with of mid-stent, one end of left side torsion bar and right torsion bar extends the support outside respectively, its overhanging end is connecting the arm of force respectively, and both sides, support top are connecting the operator's compartment erecting frame respectively by the invert center axle;

Described left torsion bar is the thick cylindrical bars in thin two ends, the identical middle part of dimensional parameters with right torsion bar, and cylindrical bar two ends diameter is respectively D1 and D2; The middle part diameter is d, is knuckle r1 transition between an end diameter D1 and the middle part diameter d, is knuckle r2 transition between other end diameter D2 and the middle part diameter d;

Effective usable length of left side torsion bar and right torsion bar is L, and the pole length of an end diameter D1 is Lc1, and the pole length at knuckle r1 place is Lb1, and the pole length of other end diameter D2 is Lc2, and the pole length at knuckle r2 place is Lb2; Diameter d bar two ends, middle part are that benchmark is respectively Le1 and Le2 apart from the length at knuckle r1 and the axial middle part of knuckle r2 respectively, and both sides knuckle r1 and knuckle r2 axially middle part are Le for the length between the benchmark;

d＝23.5-26mm，

D1＝1.2d＝31.2mm，

D2＝D1+5＝36.2mm，

r1＝r2＝100mm，

Lc1＝Lc2＝30mm，

Lb1＝17-19mm，

Lb2＝31-34mm，

Le1＝13-15mm，

Le2＝21-26mm，

Le＝822-830mm。

The process of the utility model technical solution problem is as follows:

Set up the math modeling of driver's cab turnover process:

$T_1=W\sqrt{B^2+C^2}\cos (\arctan \frac{C}{B}+\frac{\mathrm{\π}}{180}\mathrm{\θ})---\left(1\right)$

T＝T ₁-T ₂-T ₃ (4)

Effective usable length (m) of the X at B, C operator's compartment center, Z coordinate axle length (m) L torsion bar

The modulus of shearing of G torsion bar (Pa) W operator's compartment weight (N)

T ₁The gravitational moment of operator's compartment, Nm T operational torque, Nm

The right torsion bar of moment T3 that T2 left side torsion bar acts on invert center acts on the moment of invert center

θ driver's cab turnover angle, (°) the pre-torsional angle of a (°)

β 1 turns over end position, left torsion bar rotational angle on the operator's compartment

β 2 turns over end position, right torsion bar rotational angle on the operator's compartment

---torsion bar operating angle (theta function of least square fitting)

y ₁(θ), y ₂(θ)---torsion bar moment of torsion and torsion bar act on the ratio (theta function of least square fitting) of invert center moment

Get by above-mentioned:

The torsion bar diameter is come out by K=(π d^4*G/32L) * π/180 reckonings;

The torsion bar diameter is meant that above-mentioned D1 is that an end diameter, D2 are other end diameter, and d is a torsion bar middle part diameter, and K is a torsion bar rigidity in formula K=(π d^4*G/32L) * π/180, and G is the modulus of shearing of torsion bar material, and L is effective usable length of torsion bar.

Each parameter of operator's compartment is immovable, so the gravitational moment unmodified of operator's compartment, the change of Ta can make T ₂+ T ₃Curve moves up and down; The change of torsion bar diameter can make T ₂+ T ₃Slope of a curve changes.So expect best Ts, Tx, find best torsion bar diameter earlier, make and Ts+Tx minimum (being made as Y) find best pre-torsional angle to make again $\mathrm{Ts}=\mathrm{Tx}=\frac{Y}{2},$ Switching process portability the best of then such switching mechanism is seen Fig. 4 and Fig. 5.

The method of calculating the torsion bar diameter is: by getting different diameter value (pre-torsional angle is got any certain value), calculate Ts+Tx respectively, the minimum cooresponding torsion bar diameter of Ts+Tx is desired diameter.

Compared with prior art, the beneficial effects of the utility model are embodied in:

1, the overturning couple minimum of the utility model cab turning mechanism, the driver's cab turnover operation is the lightest.

2, the utility model method is applicable to the switching process of any mechanical type switching mechanism operator's compartment, different operator'ies compartment, as long as given corresponding measuring amount can obtain best torsion bar diameter, method is simple and reliable.

3, the utility model is under the condition that satisfies user's use, and the torsion bar diameter is designed to minimum, has saved material.

4, the utility model can improve the reliability and the ease of use of truck cap upset torsion bar.

Description of drawings

Fig. 1 is the utility model switching mechanism structural representation,

Fig. 2 is a torsion bar size scheme drawing,

Fig. 3 is the scheme drawing of the utility model driver's cab turnover process,

Fig. 4 is the utility model operator's compartment gravitational moment and torsion bar moment of torsion and flip angle relation curve,

Fig. 5 is the flip angle-operational torque curve of different-diameter.

Ts among above-mentioned Fig. 3, Tx turn on being respectively, maximum operational torque when turning over down, the moment of torsion that Ta produces when being the torsion bar pretwist.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Embodiment 1:

Referring to Fig. 1 and Fig. 3, a kind of Medium Truck cab turning mechanism comprises the support 6 that connects vehicle frame, parallel left torsion bar 5 and the right torsion bar 3 of being provided with in support 6 middle parts, one end of left side torsion bar 5 and right torsion bar 3 extends the support outside respectively, its overhanging end is connecting the arm of force 4 respectively, and both sides, support 6 top are connecting operator's compartment erecting frame 2 respectively by invert center axle 1.

Left side torsion bar 5 is the thick cylindrical bars in thin two ends, the identical middle part of dimensional parameters with right torsion bar 3, and cylindrical bar two ends diameter is respectively D1 and D2; The middle part diameter is d, is knuckle r1 transition between an end diameter D1 and the middle part diameter d, is knuckle r2 transition between other end diameter D2 and the middle part diameter d;

Effective usable length of left side torsion bar and right torsion bar is L, and the pole length of an end diameter D1 is Lc1, and the pole length at knuckle r1 place is Lb1, and the pole length of other end diameter D2 is Lc2, and the pole length at knuckle r2 place is Lb2; Diameter d bar two ends, middle part are that benchmark is respectively Le1 and Le2 apart from the length at knuckle r1 and the axial middle part of knuckle r2 respectively, and both sides knuckle r1 and knuckle r2 axially middle part are Le for the length between the benchmark;

At certain Medium Truck that adopts two torsion bar structures, get following data:

W＝6954.46N，B＝0.66m，C＝0.67m，L＝0.822m

G＝8×10 ¹⁰Pa，β ₁＝37°，β ₂＝40°

Because the center of turn O of driver's cab turnover center O and left and right sides torsion bar ₁, O ₂Position difference, so

n ₁/ h ₁, n ₂/ h ₂Change with θ, become the function of θ by least square fitting:

(6)

$-1.4583\×{10}^{-2}{\mathrm{\θ}}^2+1.1083\mathrm{\θ}+8.6198\×{10}^{-15}$

(7)

$+8.3333\×{10}^{-1}\mathrm{\θ}-4.7306\×{10}^{-15}$

y ₁(θ)＝6.1274×10 ^-10θ ⁶-7.3549×10 ^-8θ ⁵+2.8459×10 ^-6θ ⁴ (8)

-2.7462×10 ^-5θ ³-5.0396×10 ^-4θ ²+5.1668×10 ^-3θ+0.9671

y ₂(θ)＝4.0474×10 ^-10θ ⁶-4.8456×10 ^-8θ ⁵+1.8672×10 ^-6θ ⁴ (9)

-1.8941×10 ^-5θ ³-2.6903×10 ^-4θ ²+2.0940×10 ^-4θ+1.728

Bring in 5 formulas:

$T=6576.64\cos (0.793+\frac{\mathrm{\π\θ}}{180})-1.6659\×{10}^8{d}^4(6.1274\×{10}^{-10}{\mathrm{\θ}}^6$

$-7.3549\×{10}^{-8}{\mathrm{\θ}}^5+2.8459\×{10}^{-6}{\mathrm{\θ}}^4-2.7462\×{10}^{-5}{\mathrm{\θ}}^3-5.0396\×{10}^{-4}{\mathrm{\θ}}^2$

$+5.1668\×{10}^{-3}\mathrm{\θ}+0.9671)(37+a+4.1667\×{10}^{-6}{\mathrm{\θ}}^4-4.1667\×{10}^{-4}{\mathrm{\θ}}^3$

$+1.4583\×{10}^{-2}{\mathrm{\θ}}^2-1.1083\mathrm{\θ}-8.6198\×{10}^{-15})-1.6659\×{10}^8{d}^4(4.0474---\left(10\right)$

$\×{10}^{-10}{\mathrm{\θ}}^6-4.8456\×{10}^{-8}{\mathrm{\θ}}^5+1.8672\×{10}^{-6}{\mathrm{\θ}}^4-1.8941\×{10}^{-5}{\mathrm{\θ}}^3$

$-2.6903\×{10}^{-4}{\mathrm{\θ}}^2+2.0940\×{10}^{-4}\mathrm{\θ}+1.728)(40+a-8.3333\×{10}^{-6}{\mathrm{\θ}}^4$

$+8.3333\×{10}^{-4}{\mathrm{\θ}}^3-2.4167\×{10}^{-2}{\mathrm{\θ}}^2-8.3333\×{10}^{-1}\mathrm{\θ}+4.7306\×{10}^{-15})$

Make pre-torsional angle a=7.85 °, get different

The different Ts+Tx that obtain, according to Ts+Tx with

The rule that changes draws optimum value:

Result calculated (data are too many, choose wherein several groups) as shown in the table:

θ	d＝22.5mm	d＝23mm	d＝23.5mm	d＝24mm	d＝24.5mm
						0	571，265	199，671	-196，9	-619，741	-1069，78
1	564，6917	200，0731	-189，0	-603，957	-1045，55
						2	561，344	204，124	-177，1	-583，591	-1016，23
3	561，1203	211，7106	-161，2	-558，782	-981，957
						4	563，7522	222，5373	-141，6	-529，885	-943，135
5	568，8454	236，1711	-118，9	-497，418	-900，324
						6	575，9154	252，0807	-93，5	-462，016	-854，216
7	584，4198	269，6713	-66，2	-424，389	-805，585
						8	593，7857	288，3148	-37，7	-385，287	-755，247
9	603，4333	307，3756	-8，6	-345，469	-704，029
						10	612，796	326，2324	20，4	-305，677	-652，738
11	621，337	344，2963	48，6	-266，613	-602，141
						12	628，562	361，0251	75，5	-228，928	-552，945
13	634，0298	375，9344	100，5	-193，199	-505，781
						14	637，3597	388，6056	123，1	-159，929	-461，198
15	638，2357	398，6911	143，1	-129，535	-419，651
						16	636，4096	405，917	159，9	-102，349	-381，501
17	631，701	410，0834	173，6	-78，6113	-347，015
						18	623，9959	411，0632	183，8	-58，4802	-316，366
19	613，2435	408，798	190，6	-42，03	-289，637
						20	599，4519	403，2938	194，0	-29，2595	-266，829

21	582，6825	394，6147	193，9	-20，0986	-247，87
						22	563，0431	382，8754	190，6	-14，4171	-232，621
23	540，6809	368，2337	184，2	-12，034	-220，887
						24	515，7745	350，8818	174，9	-12，7275	-212，431
25	488，5262	331，0373	163，0	-16，2456	-206，982
						26	459，1532	308，9345	148，6	-22，3165	-204，248
27	427，8798	284，8154	132，1	-30，6597	-203，927
						28	394，9298	258，9211	113，8	-40，9953	-205，717
29	360，5186	231，4838	93，8	-53，0542	-209，33
						30	324，847	202，7197	72，4	-66，5864	-214，496
31	288，0949	172，822	49，8	-81，3691	-220，977
						32	250，4165	141，9562	26，2	-97，2124	-228，57
33	211，9367	110，2554	1，7	-113，965	-237，112
						34	172，7485	77，81795	-23，5	-131，516	-246，488
35	132，912	44，70635	-49，4	-149，798	-256，625
						36	92，45514	10，94801	-76，0	-168，786	-267，5
37	51，3764	-23，462	-103，3	-188，49	-279，128
						38	9，649101	-58，5558	-131，3	-208，956	-291，56
39	-32，7717	-94，386	-160，1	-230，253	-304，875
						40	-75，9404	-131，015	-189，8	-252，461	-319，162
Ts+Tx	713.2357	542.0782	390.9	607.707	865.853

Can get by above data comparison, when d=23.5mm, the value minimum of Ts+Tx, then the torsion bar diameter is d=23.5mm.At left and right arm of force angle of assembling both had been left torsion bar, right torsion bar maximum functional angle (left side: 37 °, the right side: 40 °) and pretwist angle sum, was respectively: 41.75 °, 44.75 °,

The data of experimental measurement are as follows:

With design-calculated switching mechanism assembling real vehicle, the performance test of overturning, the operating effort of measuring in turning over and descending to turn over the electronics resistance dynamometer sees Table 3:

Table 3 test figures

Tab.3The?results?of?test

Reverses direction	(N) for the first time	(N) for the second time	(N) for the third time	The 4th time (N)	The 5th time (N)	On average (N)
							On turn over	189	191	181	191	187	187.8
Under turn over	191	185	187	187	187	187.4

Test results shows designed switching mechanism function admirable, and the driver's cab turnover operation is light.Switching mechanism to the assembling real vehicle has carried out follow-up survey in addition, and after long-play and thousands of upsets, the switching mechanism performance is compared with initial condition almost and do not changed.The design-calculated switching mechanism reaches the design objective of expection.

Conclusion:

Satisfying the data of following table in operator's compartment weight and center of gravity:

Operator's compartment quality (N)	Operator's compartment center of gravity X coordinate B (mm)	Operator's compartment center of gravity Z coordinate C (mm)
			6958	660	670

Referring to Fig. 2, when d=23.5mm, other parameter of left torsion bar and right torsion bar is as follows, sees Fig. 2:

Effective usable length L=Le+Lc1+Lc2+Lb1+Lb2-Le1-Le2=896 of left side torsion bar and right torsion bar,

d＝23.5mm，

D1＝1.2d＝28.2mm，

D2＝D1+5＝33.2mm，

r1＝r2＝100mm，

Lc1＝Lc2＝30mm，

Lb1＝17mm，

Lb2＝31mm，

Le1＝13mm，

Le2＝21mm，

Le＝822mm。

Embodiment 2:

A kind of Medium Truck cab turning mechanism comprises the support 6 that connects vehicle frame, parallel left torsion bar 5 and the right torsion bar 3 of being provided with in support 6 middle parts, one end of left side torsion bar 5 and right torsion bar 3 extends the support outside respectively, its overhanging end is connecting the arm of force 4 respectively, both sides, support top are connecting operator's compartment erecting frame 2 by invert center axle 1, see Fig. 1;

Left side torsion bar 5 is the thick cylindrical bars in thin two ends, the identical middle part of dimensional parameters with right torsion bar 3, and cylindrical bar two ends diameter is respectively D1 and D2; The middle part diameter is d, is knuckle r1 transition between an end diameter D1 and the middle part diameter d, is knuckle r2 transition between other end diameter D2 and the middle part diameter d;

Effective usable length of left side torsion bar and right torsion bar is L, and the pole length of an end diameter D1 is Lc1, and the pole length at knuckle r1 place is Lb1, and the pole length of other end diameter D2 is Lc2, and the pole length at knuckle r2 place is Lb2; Diameter d bar two ends, middle part are that benchmark is respectively Le1 and Le2 apart from the length at knuckle r1 and the axial middle part of knuckle r2 respectively, and both sides knuckle r1 and knuckle r2 axially middle part are Le for the length between the benchmark;

Effective usable length L=Le+Lc1+Lc2+Lb1+Lb2-Le1-Le2=902 of left side torsion bar and right torsion bar,

d＝26mm，

D1＝1.2d＝31.2mm，

D2＝D1+5＝36.2mm，

r1＝r2＝100mm，

Lc1＝Lc2＝30mm，

Lb1＝19mm，

Lb2＝34mm，

Le1＝15mm，

Le2＝26mm，

Le＝830mm。

Claims (1)

1, a kind of Medium Truck cab turning mechanism, comprise the support that connects vehicle frame, parallel left torsion bar and the right torsion bar of being provided with of mid-stent, one end of left side torsion bar and right torsion bar extends the support outside respectively, its overhanging end is connecting the arm of force respectively, both sides, support top are connecting the operator's compartment erecting frame respectively by the invert center axle, it is characterized in that:

Described left torsion bar and right torsion bar are the thick cylindrical bar in thin two ends, middle part;

Described cylindrical bar one end diameter D1=1.2d=31.2mm, other end diameter D2=D1+5=36.2mm; The middle part diameter d is 23.5-26mm, is knuckle r1 transition between an end diameter D1 and the middle part diameter d, is knuckle r2 transition between other end diameter D2 and the middle part diameter d; Knuckle r1 is 100mm, and knuckle r2 is 100mm;

Effective usable length of left side torsion bar and right torsion bar is L, the pole length Lc1 of one end diameter D1 is 30mm, the pole length Lb1 at knuckle r1 place is 17-19mm, the pole length Lc2 of other end diameter D2 is 30mm, the pole length Lb2 at knuckle r2 place is 31-34mm, diameter d bar two ends, middle part be benchmark respectively apart from the length of knuckle r1 respectively Le1 be 13-15mm, diameter d bar two ends, middle part are that the length L e2 at the axial middle part of stand-off knuckle r2 is 21-26mm, and both sides knuckle r1 and knuckle r2 axially middle part are 822-830mm for the length L e between the benchmark.

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