CN109649154B

CN109649154B - Driving wheel of electric forklift

Info

Publication number: CN109649154B
Application number: CN201910036802.0A
Authority: CN
Inventors: 余东; 岑展宇; 邵杨希子
Original assignee: Ningbo Zhongdalide Smart Drive Co Ltd
Current assignee: Ningbo Zhongdalide Smart Drive Co Ltd
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2020-03-27
Anticipated expiration: 2039-01-15
Also published as: CN109649154A

Abstract

A driving wheel of an electric forklift comprises a driving support, a driving motor arranged on the driving support, a transmission assembly and a rubber-coated wheel assembly rotatably connected to the outer ring of the driving motor, wherein the driving support comprises an installation part and a connecting part, the connecting part comprises a transverse plate and a hollow connecting column, and a threading through hole communicated with the inner cavity of the connecting column is formed in the side wall of the transverse plate; driving motor is fixed in installation department one side, power control line passes threading through-hole and spliced pole inner chamber in proper order and is connected with electric fork truck's control system, the drive assembly includes the driving gear, transmission shaft and fixed suit are in epaxial first driven gear and the second driven gear of transmission, the driving gear is fixed in on driving motor's the output shaft, the transmission shaft passes through the bearing and supports the rotation and install in the installation department, driving gear and first driven gear meshing, rubber coating wheel subassembly includes sleeve and rubber coating wheel, the sleeve rotates the suit in driving motor's outer lane, be equipped with the ring gear with second driven gear intermeshing on the sleeve inner wall.

Description

Driving wheel of electric forklift

Technical Field

The invention relates to the technical field of electric forklifts, in particular to a driving wheel of an electric forklift.

Background

The forklift is an industrial carrying vehicle, is various wheeled carrying vehicles for loading, unloading, stacking and short-distance transportation of finished pallet goods, plays a very important role in a logistics system of an enterprise, and is a main force in material carrying equipment. It is commonly used for transportation of large warehouse goods, and is usually driven by an oil-burning engine or a battery. Electric forklifts driven by batteries are gradually replacing diesel forklifts and manual forklifts because of their advantages of no pollution, low noise, flexibility and convenience.

The driving wheel of the electric forklift is an important part in the forklift and comprises a driving support, a driving motor and a rubber-coated wheel assembly, wherein the driving motor and the rubber-coated wheel assembly are arranged in the driving support, the top of the driving support is connected with a direction control device of the electric forklift, a driving gear is fixed on an output shaft of the driving motor, a transmission shaft is rotatably arranged in the driving support, a first driven gear and a second driven gear are fixedly arranged on the transmission shaft, the driving gear is meshed with the first driven gear, an inner gear cylinder is rotatably connected outside the driving motor, an inner gear ring meshed with the second driven gear is arranged on the inner wall of the inner gear cylinder, and the rubber-coated wheel assembly is fixedly sleeved on the inner.

Among the above-mentioned electric fork truck's the drive wheel, driving motor's power control line is connected with electric fork truck's control system, often there is one section distance between driving motor and the control system, consequently, the power control line between driving motor and the control system can long-term activity expose outside, and fork truck also can be used for in the open air environment usually, consequently after a period of time uses, the power control line is damaged easily to and can produce wearing and tearing between the in-process power control line that the wheel turned to and other parts, the life of drive wheel has been shortened, the later maintenance cost is high.

Disclosure of Invention

The invention aims to provide an electric forklift driving wheel which can guide and limit a power control line well and has a protection effect.

The above object of the present invention is achieved by the following technical solutions: the driving wheel of the electric forklift comprises a driving support, a driving motor, a transmission assembly and a rubber-coated wheel assembly, wherein the driving motor is mounted on the driving support, the rubber-coated wheel assembly is rotatably connected to the outer ring of the driving motor, the driving support comprises a mounting part and a connecting part which is vertically connected to the top of the mounting part and is vertical to the mounting part, the connecting part comprises a transverse plate and a hollow connecting column which is vertical to the top of the transverse plate, a threading through hole which is communicated with the inner cavity of the connecting column is formed in the side wall of the transverse plate, and a rounding surface is formed in the edge; driving motor be fixed in installation department one side, the power control line of being connected with driving motor pass in proper order the inner chamber and the electric fork truck's of threading through-hole and spliced pole control system be connected, transmission assembly include driving gear, transmission shaft and fixed suit in epaxial first driven gear of transmission and second driven gear, the driving gear is fixed in on driving motor's the output shaft, the transmission shaft pass through the bearing support rotate install in on the installation department, driving gear and first driven gear meshing, rubber coating wheel subassembly include the sleeve and be fixed in the rubber coating wheel of sleeve outer lane, the sleeve rotate the suit in driving motor's outer lane, be provided with on the telescopic inner wall with second driven gear intermeshing's ring gear.

Through adopting above-mentioned technical scheme, through adopting integrative casting shaping with the drive support, the direct shaping has the threading through-hole and with the cavity spliced pole of threading through-hole intercommunication on the drive support, and power supply control line wears to adorn and leads spacingly, can play certain spacing guard action to power supply control line promptly, has prolonged the life of drive wheel.

The invention is further arranged in that an arc transition surface is arranged at the orifice of the threading through hole communicated with the inner cavity wall of the connecting column, and a round surface is arranged at the inner orifice of the top end of the connecting column.

Through adopting above-mentioned technical scheme, realize the arc surface transitional coupling through the inner chamber with threading through-hole and spliced pole, all be provided with the radius face in the drill way of threading through-hole and the interior drill way of spliced pole top simultaneously, improved the guard action to the power control line.

The invention is further arranged in that the sleeve comprises an inner cylinder and an outer cylinder which is detachably sleeved on the inner cylinder, one end of the outer cylinder, which is close to the mounting part, extends out of the end part of the inner cylinder and forms an oil cavity with the mounting part, and an annular elastic oil seal body is arranged between the outer cylinder and the mounting part.

By adopting the technical scheme, the sleeve is formed into a whole by sleeving the inner cylinder body and the outer cylinder body, when the rubber-covered wheel needs to be replaced, only the outer cylinder body needs to be detached from the inner cylinder body, and the problem that each part of the integral driving wheel needs to be detached when the rubber-covered wheel needs to be replaced every time in the driving wheel in the prior art is avoided, so that the later maintenance cost is increased; through the arrangement of the oil cavity and the elastic oil seal body, grease can be stored in the oil cavity, and the service life of the driving wheel is prolonged.

The oil seal structure is further provided with an annular supporting part which axially protrudes towards one side of the driving motor from the mounting part, the oil seal body comprises an annular body sleeved outside the annular supporting part, an inner ring body and an outer ring body are axially and outwardly protruded from the end surface of one side of the annular body, the inner ring body is tightly abutted against the outer circular surface of the annular supporting part, and the outer ring body is elastically abutted against the inner wall of the outer cylinder body.

Through adopting above-mentioned technical scheme, through set up annular supporting part on the installation department, made things convenient for the installation of oil seal body and the firmness of oil seal body installation, improved sealed effect.

The invention is further arranged that the outer peripheral surface of the outer ring body is a conical surface, so that the radial thickness of the outer ring body is gradually reduced along the direction far away from the annular body.

By adopting the technical scheme, the outer peripheral surface of the outer ring is set to be the conical surface, so that the contact surface between the outer ring body and the outer cylinder body is smaller, and the friction force between the outer ring body and the outer cylinder body is reduced under the condition of ensuring the sealing effect.

The invention is further arranged in that one end of the outer cylinder body, which is far away from the mounting part, is provided with an annular flange in a radial inward protruding mode, and the end face of the inner cylinder body is abutted against the annular flange and fixedly connected with the annular flange through a screw.

Through adopting above-mentioned technical scheme, adopt screw erection joint through annular flange and interior barrel, easy dismounting when making the change rubber-coated wheel has reduced the maintenance cost.

The invention is further provided that a dustproof sheet is arranged between the annular rib and the shell of the driving motor.

Through adopting above-mentioned technical scheme, through the setting of dustproof piece, can prevent that dust impurity etc. from getting into between barrel and driving motor's the shell, influencing the normal operating of drive wheel.

The invention is further arranged in such a way that a plurality of annular bulges arranged at intervals are arranged on the outer circular surface of the outer cylinder body, and annular grooves which correspond to the annular bulges and are matched with the annular bulges are arranged on the inner circular surface of the rubber coating wheel.

Through adopting above-mentioned technical scheme, have annular protrusion and annular groove to mutually support, improved the firm in connection degree between interior barrel and the outer barrel.

The rubber-coated wheel further comprises a TPE inner wheel body and a rubber outer wheel body fixedly sleeved outside the TPE inner wheel body.

Through adopting above-mentioned technical scheme, will set up in the outside through the outer wheel body of rubber, guarantee the wearability, through the setting of wheel body in the TPE, also guaranteed elasticity simultaneously, make fork truck move with turn to in-process stability good with the structural strength who has improved the rubber-coated wheel.

The invention is further provided that the TPE inner wheel body of the rubber covered wheel is formed by injection molding of a thermoplastic elastomer, and the thermoplastic elastomer comprises the following components in percentage by mass: 58-72 parts of SEBS, 13-17 parts of coral powder, 3-5 parts of a lubricant, 8-12 parts of ABS, 3-5 parts of carbonamide, 1-2 parts of a surfactant, 2-4 parts of a heat stabilizer, 14-16 parts of diatomite, 2-3 parts of 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-benzotriazole chloride, 2-4 parts of lithium aluminum hydride, 3-5 parts of grinding wheel ash and 2-4 parts of benzalkonium chloride.

Through adopting above-mentioned technical scheme, because diatomaceous earth is inside to be the porosity structure, it can be more inseparabler through pore and other material on every side like this for the inside great mechanical strength that has of wheel body in the TPE after the shaping, can reduce the probability of mechanical damage effectively, constitute the raw materials of thermoplastic elastomer by foretell composition, improved rubber coating wheel's life.

Moreover, still add in this application TPE and have the heat stabilizer, its high temperature resistance who has strengthened TPE effectively has avoided the rubber coating wheel of fork truck drive wheel to use for a long time and appear melting phenomenon under the open-air high temperature environment in summer.

In addition, this application TPE material still has characteristics such as good high elasticity, high strength to can make rubber-coated wheel good stability in the use.

And the main components of the grinding wheel ash are silicon carbide and iron oxide, which can effectively enhance the mechanical strength of TPE.

By adopting the technical scheme, the 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-chlorinated benzotriazole can strongly absorb ultraviolet rays with the wavelength of 270-380 nm, and has good chemical stability and extremely low volatility. And, it also has excellent resistance to thermal sublimation, washing resistance, gas fading resistance and mechanical property retention. Meanwhile, the combination of the compound and lithium aluminum hydride can generate a remarkable synergistic effect, and the thermal oxidation stability of the TPE product is improved.

Preferably, the coral powder is treated with an enzyme solution containing alkaline protease, papain and trypsin.

Through adopting above-mentioned technical scheme, contain a large amount of calcium carbonate in the coral powder at first, it helps strengthening TPE's shaping effect. Meanwhile, the coral powder treated by the three enzyme solutions retains the performance of the original coral powder, releases the chitin in the coral powder, has stronger viscosity, and can further ensure the bonding firmness among the components, thereby improving the mechanical damage resistance of the TPE.

Preferably, the average particle size of the coral powder is less than 10 μm.

By adopting the technical scheme, the coral powder is fine in particles, so that the coral powder can be uniformly dispersed in other components, and the fluidity of a mixture in a molten state is also ensured.

Preferably, the lubricant is TAF.

By adopting the technical scheme, the TAF lubricant can enhance the lubricating property among the raw materials, so that the raw materials can be fully mixed in the production process. Meanwhile, the material also has a polar group structure combined with partial polar groups on the surface of diatomite, coral powder and the like. For the whole composite system, the TAF lubricant can promote similar anchoring nodes to be formed between the diatomite, the coral powder and the SEBS, improve the bonding state of the diatomite, the coral powder and the SEBS, and further improve the dispersibility of the diatomite, the coral powder and the like in the SEBS.

Preferably, the surfactant is a mixture of sodium dodecyl benzene sulfonate and fatty acid methyl ester polyoxyethylene ether.

By adopting the technical scheme, the mixture of the sodium dodecyl benzene sulfonate and the fatty acid methyl ester polyoxyethylene ether is respectively an anionic surfactant and a nonionic surfactant, and the anionic surfactant and the nonionic surfactant are compounded for use and can generate a synergistic effect, so that the dispersion effect among the raw materials is effectively promoted.

Meanwhile, because fatty acid methyl ester polyoxyethylene ether contains fatty acid radical ions, in the process of mixing and extruding in a double-screw extruder, the fatty acid radical ions can react with Ca2+, CaHCO3+, CaOH + and other ions in the coral powder to generate fatty acid calcium precipitates, the precipitates are coated on the surfaces of coral powder particles, and hydrocarbon groups in the fatty acid calcium enable the surface properties of the coral powder to be changed from hydrophilic to lipophilic.

Preferably, the heat stabilizer is an iodide salt.

Through adopting above-mentioned technical scheme, the heat stability ability that the heat stabilizer of iodide salt not only can improve TPE, and it still is favorable to strengthening TPE's weatherability simultaneously to also be favorable to prolonging the life of interior wheel body.

Preferably, the iodide salt is lithium iodide.

Through adopting above-mentioned technical scheme, lithium iodide not only has improved TPE's thermal stability because of self physical properties compared with other iodide salt. Meanwhile, lithium ions in the lithium iodide can also have a matching effect with carbonyl in the TPE, a network-like structure is generated, and the movement of TPE molecular chains and corresponding free radicals is blocked, so that the molecular chains of the polymer need to overcome a larger energy barrier than the completely free molecular chains when being heated and decomposed, and the TPE is promoted to have a higher thermal decomposition temperature.

In conclusion, the beneficial technical effects of the invention are as follows: 1. the driving support is integrally cast, the threading through hole and the hollow connecting column communicated with the threading through hole are directly formed in the driving support, and the power supply control line is penetrated and limited, so that a certain limiting protection effect can be achieved by the power supply control line, and the service life of the driving wheel is prolonged; 2. the sleeve is formed by sleeving the inner cylinder body and the outer cylinder body into a whole, when the rubber-covered wheel needs to be replaced, the outer cylinder body only needs to be detached from the inner cylinder body, the problem that the integral driving wheel needs to be detached when the rubber-covered wheel needs to be replaced every time of the original driving wheel is avoided, and therefore the later maintenance process is reduced; through the arrangement of the oil cavity and the elastic oil seal body, grease can be stored in the oil cavity, and the service life of the driving wheel is prolonged.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention.

Fig. 3 is a schematic view of the driving bracket according to the present invention.

Fig. 4 is a structural schematic view of the driving bracket in another direction according to the present invention.

Fig. 5 is a schematic structural view of the oil seal body according to the present invention.

FIG. 6 is a schematic cross-sectional view of the rubber-covered wheel according to the present invention.

In the figure, 1, a driving bracket; 101. an installation part; 102. a transverse plate; 103. connecting columns; 104. an annular support portion; 105. a motor support portion; 106. an upper shaft hole; 107. a lower shaft hole; 108. a threading through hole; 109. an auxiliary through hole; 110. an upper gear mounting groove; 111. a lower gear mounting groove; 112. a central through hole; 2. a rubber covered wheel assembly; 3. a drive motor; 4. wrapping a rubber wheel; 41. an outer wheel body; 42. an inner wheel body; 5. an outer cylinder; 6. an inner cylinder; 7. an oil seal body; 71. an annular body; 72. an outer ring body; 73. an inner ring body; 8. an oil chamber; 9. sealing the cover; 10. braking; 11. an output shaft; 12. a driving gear; 13. a first driven gear; 14. a drive shaft; 15. a second driven gear.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-6, the driving wheel for an electric forklift disclosed by the invention comprises a driving bracket 1, a driving motor 3 mounted on the driving bracket 1, a transmission assembly and a rubber-covered wheel assembly 2 rotatably connected to the outer ring of the driving motor 3.

The driving bracket 1 comprises an installation part 101 and a connection part, wherein the installation part 101 is formed by integral casting, the connection part is vertically connected to the top of the installation part 101 and is vertical to the installation part 101, the connection part comprises a transverse plate 102 and a hollow connecting column 103 which is vertical to the top of the transverse plate 102, the connecting column 103 is a cylinder with a central through hole 112, a threading through hole 108 communicated with the inner cavity of the connecting column 103 is arranged on the side wall of the transverse plate 102, the section of the threading through hole 108 is a semicircle with an upward opening, an auxiliary through hole 109 is arranged on the side wall of one end, close to the transverse plate 102, of the connecting column 103, the section of the auxiliary through hole 109 is rectangular, the lower end part of the auxiliary through hole 109 is communicated with the threading through hole 108 to form a special-shaped hole, the driving motor 3 is fixed on one side of the installation part 101, the limitation on the size of the hole diameter during machining is avoided, the threading is facilitated, the assembly efficiency is improved, and the control line is protected; the edge of the hole opening of the auxiliary through hole 109 on the side wall of the connecting column 103 is provided with a rounding surface, the edge of the hole opening of the threading through hole 108 on the side wall of the transverse plate 102 is provided with a rounding surface, the hole openings of the threading through hole 108 communicated with the inner cavity wall of the connecting column 103 and the hole openings of the auxiliary through hole 109 on the inner cavity wall of the connecting column 103 are provided with arc transition surfaces, and the hole openings at the top end of the connecting column 103 are provided with rounding surfaces.

An upper shaft hole 106 and a lower shaft hole 107 with central lines positioned on the same vertical plane are arranged on the mounting part 101, an annular supporting part 104 and an annular motor supporting part 105 are axially and convexly arranged on one side surface of the mounting part 101 positioned on the same side with the connecting part, the annular supporting part 104 and the motor supporting part 105 are coaxial with a lower peripheral hole, the upper part of the motor supporting part 105 is provided with a notch, the upper shaft hole 106 is correspondingly positioned in the center of the notch, a shell of the driving motor 3 is positioned in the motor supporting part 105 and is fixedly connected with the mounting part 101 through a screw, and an output shaft 11 of the driving motor 3 penetrates through the lower shaft hole 107 and penetrates out; an upper gear mounting groove 110 and a lower gear mounting groove 111 which are communicated with each other and respectively correspond to and are coaxial with the upper shaft hole 106 and the lower shaft hole 107 one by one are arranged on the other side surface of the mounting part 101,

the transmission assembly comprises a driving gear 12, a transmission shaft 14, a first driven gear 13 and a second driven gear 15 which are fixedly sleeved on the transmission shaft 14, the driving gear 12 is fixed on an output shaft 11 of the driving motor 3 and is positioned in a lower gear mounting groove 111, the transmission shaft 14 is rotatably mounted in an upper shaft hole 106 on the mounting part 101 through a bearing support, the first driven gear 13 is positioned in the upper gear mounting groove 110, the driving gear 12 is meshed with the first driven gear 13, a sealing cover 9 on the upper gear mounting groove 110 and the lower gear mounting groove 111 of the sealing cover 9 is mounted on the mounting part 101 through screws, one side of the sealing cover 9 facing the mounting part 101 is provided with a bearing mounting groove coaxial with the upper shaft hole 106, the end part of the transmission shaft 14 extends into the bearing mounting groove and is rotatably mounted with the bearing mounting groove through a bearing, the end part of the output shaft 11 of the driving motor 3 extends out, the brake 10 is a conventional device used in an electric motor and will not be described in detail herein.

The second driven gear 15 is located in the notch and integrally formed with the transmission shaft 14 to form a gear shaft, the top of the second driven gear 15 is higher than the top end of the motor installation part 101, which is located on two sides of the notch, the rubber-coated wheel assembly 2 comprises a sleeve and a rubber-coated wheel 4 fixed on the outer ring of the sleeve, the sleeve is sleeved on the driving motor 3 shell through a bearing, a step end face facing the installation part 101 is arranged on the outer circular face of one end, close to the installation part 101, of the driving motor 3 shell, an inner ring of the bearing abuts against the step end face, an inner ring gear meshed with the second driven gear 15 is arranged on the inner wall of one end, close to the installation part 101, of the sleeve, and.

The sleeve comprises an inner cylinder body 6 and an outer cylinder body 5 detachably sleeved on the inner cylinder body 6, one end, close to the mounting portion 101, of the outer cylinder body 5 extends out of the end portion of the inner cylinder body 6 and forms an oil cavity 8 with the mounting portion 101, an annular elastic oil seal body 7 is arranged between the outer cylinder body 5 and the mounting portion 101, the oil seal body 7 comprises an annular body 71 sleeved outside an annular supporting portion 104, an inner ring body 73 and an outer ring body 72 are axially and outwards arranged on the end face of one side of the annular body 71 in a protruding mode, the inner ring body 73 tightly abuts against the outer circular face of the annular supporting portion 104, and the outer ring body 72 elastically abuts against the inner wall of the outer cylinder; the outer circumferential surface of the outer ring body 72 is a conical surface, so that the radial thickness of the outer ring body 72 is gradually reduced in a direction away from the annular body 71.

The radial inward bulge of one end of outer barrel 5, far away from installation department 101, is provided with annular flange, and 6 terminal surfaces of interior barrel are passed through screw fixed connection with annular flange butt, are provided with the dust guard between annular flange and driving motor 3's the shell.

Be provided with the annular arch that a plurality of interval distance set up on the outer disc of outer barrel 5, rubber-covered wheel includes wheel body and the fixed outer wheel body of rubber of adorning in the wheel body outside in TPE in the TPE, be provided with on the inner wall of wheel body in the TPE a plurality of with the annular groove that the annular arch corresponds, the cross-section of the outer wheel body of rubber is the ring body of concave font, and the wheel body inlays the concave part of dress in the ring body in the TPE.

The inner wheel body of the rubber covered wheel is formed by injection molding of a thermoplastic elastomer, and the preparation method of the thermoplastic elastomer mainly comprises the following steps:

weighing 58Kg of SEBS, adding the SEBS into a mixer, preheating the SEBS to 110 ℃ by using 200GHz microwave, rotating the mixer at a rotating speed of 60rpm under a microwave environment, and keeping the rotating speed for 2 hours;

step two, after the preheating in the step one is finished, sequentially adding weighed 8Kg of ABS, 13Kg of coral powder, 14Kg of diatomite, 3Kg of lubricant, 2Kg of heat stabilizer, 3Kg of carbamide, 1Kg of surfactant, 2Kg of 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-chlorobenzotriazole, 2Kg of lithium aluminum hydride, 3Kg of grinding wheel ash and 2Kg of benzalkonium chloride into a mixer, raising the temperature to 130 ℃, uniformly stirring the materials by using a stirring paddle, and keeping for 1 hour to obtain a mixture;

step three, adding the mixture obtained in the step two into an extruder for extrusion molding, and simultaneously controlling the heating temperature of the extruder to be 200 ℃ and the vacuum degree to be 30 Kp;

the preparation method of the coral powder comprises the following steps: firstly, preparing a sodium sulfite buffer solution with the pH of 8.0, using a small amount of triton as a surfactant, respectively using combined enzymes of alkaline protease, papain, trypsin and other enzymes as catalysts, soaking shells in the sodium sulfite buffer solution, and hydrolyzing for 2 hours under the conditions that the temperature of a constant temperature shaking table is controlled to be 50 ℃ and the rotating speed is 300 r/min. Thereafter, the coral is ground into coral powder having an average particle size of less than 10 μm.

The SEBS is preheated, so that molecular bonds can be fully opened after the SEBS is melted, and other components can be better blended with the SEBS; the microwave is beneficial to accelerating the temperature rising rate of the SEBS. Meanwhile, the microwaves are directional, the intensity of the microwaves is gradually weakened along with the increase of the distance, and the drum-type mixer can enable the SEBS at each position in the mixer to be uniformly irradiated by the microwaves when rolling, so that the SEBS in the mixer can be uniformly heated, the preheating efficiency can be improved, and the probability of thermal degradation of the SEBS can be reduced.

And TAF is selected as the lubricant. The surfactant is a mixture of sodium dodecyl benzene sulfonate and fatty acid methyl ester polyoxyethylene ether, and the mass ratio of the sodium dodecyl benzene sulfonate to the fatty acid methyl ester polyoxyethylene ether is preferably 1: 1. next, the heat stabilizer is an iodide salt such as potassium iodide, cuprous iodide, or the like, and here, lithium iodide is preferable.

The differences between the second to fifth examples and the first to third comparative examples and the first example are shown in the following tables I and II:

watch 1

Watch two

Wherein the heat stabilizer of comparative example one and comparative example two is lithium iodide, and the heat stabilizer of comparative example three and comparative example four is zinc ricinoleate.

And (5) testing the ageing resistance and the weather resistance of the finished TPE.

The test method comprises the following steps:

aging resistance: firstly, testing the tensile strength ASTM-D412, the elongation ASTM-D412 and the tear strength ASTM-D624 of the TPE, and then testing the tensile strength, the elongation and the tear strength of the TPE after the TPE is irradiated by ultraviolet rays with the strength of 200uW/cm 2; weather resistance: and (3) placing the TPE in an environment at 50 ℃ for 4 hours, then placing the TPE in an environment at-10 ℃ for 4 hours, repeating the steps for 3 times, and then detecting the tensile strength, the elongation and the tearing strength of the TPE.

The results are shown in the following table:

as can be seen from the test results of the above examples one to five, the TPE of the present application has good mechanical properties and thermal stability. In addition, the combination of 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-chlorobenzotriazole and lithium aluminum hydride in the application can show that TPE has good ageing resistance and weather resistance by combining the results of the third comparative example, the fourth comparative example and the third example.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. An electric fork truck driving wheel which characterized in that: the rubber coating wheel assembly comprises a driving support (1), a driving motor (3) installed on the driving support (1), a transmission assembly and a rubber coating wheel assembly (2) rotatably connected to the outer ring of the driving motor (3), wherein the driving support (1) comprises an installation part (101) and a connecting part which is vertically connected to the top of the installation part (101) and is vertical to the installation part (101), the connecting part comprises a transverse plate (102) and a hollow connecting column (103) which is vertical to the top of the transverse plate (102), a threading through hole (108) communicated with the inner cavity of the connecting column (103) is formed in the side wall of the transverse plate (102), and an inverted round surface is arranged on the edge of an orifice of the threading through hole (108) located on the side wall of the; the driving motor (3) is fixed on one side of the mounting part (101), a power control line connected with the driving motor (3) sequentially penetrates through the threading through hole (108) and an inner cavity of the connecting column (103) to be connected with a control system of the electric forklift, the transmission assembly comprises a driving gear (12), a transmission shaft (14) and a first driven gear (13) and a second driven gear (15) fixedly sleeved on the transmission shaft (14), the driving gear (12) is fixed on an output shaft (11) of the driving motor (3), the transmission shaft (14) is rotatably mounted on the mounting part (101) through a bearing support, the driving gear (12) is meshed with the first driven gear (13), the rubber-coated wheel assembly (2) comprises a sleeve and a rubber-coated wheel (4) fixed on the outer ring of the sleeve, and the sleeve is rotatably sleeved on the outer ring of the driving motor (3), an inner gear ring meshed with the second driven gear (15) is arranged on the inner wall of the sleeve; the sleeve comprises an inner cylinder body (6) and an outer cylinder body (5) detachably sleeved on the inner cylinder body (6), one end, close to the mounting part (101), of the outer cylinder body (5) extends out of the end part of the inner cylinder body (6) and forms an oil cavity (8) with the mounting part (101), and an annular elastic oil seal body (7) playing a sealing role is arranged between the outer cylinder body (5) and the mounting part (101);

the oil seal structure is characterized in that an annular supporting portion (104) is axially and convexly arranged on one side, facing the driving motor (3), of the mounting portion (101), the oil seal body (7) comprises an annular body (71) sleeved outside the annular supporting portion (104), an inner ring body (73) and an outer ring body (72) are axially and outwards convexly arranged on one side end face of the annular body (71), the inner ring body (73) is tightly abutted to the outer circular face of the annular supporting portion (104), and the outer ring body (72) is elastically abutted to the inner wall of the outer barrel body (5).

2. The electric forklift drive wheel according to claim 1, characterized in that: the threading through hole (108) with the drill way department of spliced pole (103) inner chamber wall intercommunication is provided with the circular arc transition face, the inner drill way department on spliced pole (103) top be provided with the radius face.

3. The electric forklift drive wheel according to claim 2, characterized in that: the outer peripheral surface of the outer ring body (72) is a conical surface, so that the radial thickness of the outer ring body (72) is gradually reduced along the direction away from the annular body (71).

4. A drive wheel for an electric forklift according to claim 3, characterized in that: outer barrel (5) keep away from the radial inward bulge of one end of installation department (101) is provided with annular flange, interior barrel (6) terminal surface with annular flange butt passes through screw fixed connection.

5. The electric forklift drive wheel according to claim 4, characterized in that: and a dustproof sheet is arranged between the annular flange and the shell of the driving motor (3).

6. The electric forklift drive wheel according to claim 5, characterized in that: the outer circular surface of the sleeve is provided with a plurality of annular bulges arranged at intervals, and the inner circular surface of the rubber coating wheel (4) is provided with annular grooves which correspond to the annular bulges and are matched with the annular bulges.

7. The electric forklift drive wheel according to claim 6, characterized in that: the rubber-coated wheel comprises a TPE inner wheel body and a rubber outer wheel body fixedly sleeved outside the TPE inner wheel body.

8. The electric forklift drive wheel according to claim 7, characterized in that: the TPE inner wheel body of the rubber-coated wheel (4) is formed by injection molding of a thermoplastic elastomer, and the thermoplastic elastomer comprises the following components in percentage by mass: 58-72 parts of SEBS, 13-17 parts of coral powder, 3-5 parts of a lubricant, 8-12 parts of ABS, 3-5 parts of carbonamide, 1-2 parts of a surfactant, 2-4 parts of a heat stabilizer, 14-16 parts of diatomite, 2-3 parts of 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-benzotriazole chloride, 2-4 parts of lithium aluminum hydride, 3-5 parts of grinding wheel ash and 2-4 parts of benzalkonium chloride.