High-efficient, convenient and low-noise mechanical gearbox

Abstract

The application discloses a kind of high efficiency convenient low-noise mechanical gearbox, including box, output shaft, input shaft, shift shaft, reverse shaft, forward shaft are arranged in the cavity of box, front three output passive gear and output gear set are equipped on output shaft, input driving gear and input gear set are equipped on input shaft, input passive gear and shift gear set are equipped on shift shaft, reverse gear set is equipped on reverse shaft, forward gear set is equipped on forward shaft, input driving gear is engaged with input passive gear, each reverse driving gear in shift gear set is engaged with corresponding passive gear in reverse gear set, each reverse forward driving gear in shift gear set is engaged with corresponding passive gear in forward gear set, active tooth in input gear set is engaged with corresponding passive gear in output gear set;The application is convenient to operate, and scene is quickly changed, can effectively reduce production cost, and improve the economic benefit of user.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forklift transmission device, in particular to a high-efficiency convenient low-noise mechanical gearbox. BACKGROUND

[0002] Forklift is an indispensable work tool in the logistics industry, and is widely used in the market. The forklift gearbox is used to transmit the power of the engine to the drive axle to change the torque and speed of the engine. Since the forklift needs to maintain light and flexible performance, the axial size of the forklift gearbox is also relatively small. This makes the input shaft and output shaft in the forklift gearbox present a staggered parallel arrangement to save the axial size of the forklift gearbox. The current domestic 3T series industrial forklift has multiple gears, and the mechanical gearbox used for high and low gear control by a lever controls the forward and reverse gear switching, and the other lever controls the high and low speed gear switching. The operation is relatively complicated, occupies a large space, takes a long time to change scenes, and has a large noise, which limits the practical application space of such forklifts. SUMMARY

[0003] The purpose of the present application is to provide a high-efficiency convenient low-noise mechanical gearbox to solve the problems raised in the background.

[0004] To achieve the above purpose, the present application realizes the following technical means:

[0005] A high-efficiency convenient low-noise mechanical gearbox, comprising a box body, an output shaft, an input shaft, a shift shaft, a reverse shaft and a forward shaft are arranged in parallel in the inner cavity of the box body, a front three output driven gear synchronous with the output shaft and an output gear set rotatable relative to the output shaft are arranged on the output shaft, an input driving gear synchronous with the input shaft and an input gear set rotatable relative to the input shaft are arranged on the input shaft, an input driven gear synchronous with the shift shaft and a shift gear set rotatable relative to the shift shaft are arranged on the shift shaft, a reverse gear set synchronous with the reverse shaft is arranged on the reverse shaft, a forward gear set synchronous with the forward shaft is arranged on the forward shaft, the input driving gear is engaged with the input driven gear, each reverse driving gear in the shift gear set is engaged with the corresponding driven gear in the reverse gear set, each reverse forward driving gear in the shift gear set is engaged with the corresponding driven gear in the forward gear set, the driving gear in the input gear set is engaged with the corresponding driven gear in the output gear set, a shift mechanism driving the shift shaft is arranged on the box body, and the right end of the output shaft is connected with the differential assembly through a helical gear pair.

[0006] Further, the input gear set comprises a front three output driving gear, a front three synchronizer assembly, the front three output driving gear, the front three synchronizer assembly and the input driving gear are sequentially installed on the input shaft, the front three output driving gear is in mesh with a front three output driven gear on the output shaft.

[0007] Further, the gear shifting gear set comprises a first gear set and a second gear set, the first gear set sequentially comprises a front first driving gear, a first synchronizer assembly and a reverse first driving gear, the second gear set sequentially comprises a front second driving gear, a second synchronizer assembly and a reverse second driving gear, the reverse first driving gear is in mesh with a reverse first driven gear arranged on the reverse shaft, the reverse second driving gear is in mesh with a reverse second driven gear arranged on the reverse shaft, the front first driving gear is in mesh with a front first driven gear arranged on the forward shaft, and the front second driving gear is in mesh with a front second driven gear arranged on the forward shaft.

[0008] Further, the reverse gear set comprises a reverse output driving shaft, a reverse first driven gear and a reverse second driven gear which are sequentially arranged on the reverse shaft.

[0009] Further, the forward gear set comprises a front first driven gear, a forward output driving gear, a reverse output idler gear and a front second driven gear which are sequentially arranged on the forward shaft.

[0010] Further, the gear selecting and shifting mechanism comprises an upper cover, the upper cover is fixed above the box body, the inner cavity of the upper cover is parallelly arranged with a first gear shifting fork shaft, a second gear shifting fork shaft and a third gear shifting fork shaft, the first gear shifting fork shaft, the second gear shifting fork shaft and the third gear shifting fork shaft are respectively arranged with a first gear shifting fork, a second gear shifting fork and a third gear shifting fork, the first gear shifting fork and the second gear shifting fork are arranged at the end of the first gear shifting fork shaft and the second gear shifting fork shaft, the upper cover is movably arranged with a gear selecting and shifting shaft at the upper part of the inner cavity, the right end of the gear selecting and shifting shaft is connected with a control rod, the middle part of the control rod is connected with one end of a gear selecting and shifting arm which is connected with the gear selecting and shifting shaft, the gear selecting and shifting shaft is arranged with gear shifting knobs which are matched with the shifting fork shafts.

[0011] Further, the input shaft comprises an input shaft A and an input shaft B, one end of the input shaft A extends into the inner cavity of the input shaft B and is movably connected with the input shaft B, the input shaft B is arranged in the upper inner cavity of the box body, the outer part of the input shaft B is sequentially arranged with an input driving gear, a third gear synchronizer assembly and a front three output driving gear, the outer part of the input shaft A is movably sleeved with an extension sleeve, the right end of the extension sleeve is arranged in the inner cavity of a bearing seat, the extension sleeve is arranged with a snap spring B which is matched with the bearing seat arranged on the box body, the end of the input shaft A is arranged with a snap spring A which is matched with the extension sleeve.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] The present application is convenient to operate and fast to shift, and can easily and conveniently select and change 3 forward gears and 2 reverse gears through linkage of left and right movement and forward and backward push and pull of a single operating lever, changes the fixed mode of high and low gear control of double lever operation, can meet the pursuit of users for easy and convenient humanization, changes the conventional gear design by adopting shaving process, reasonably reduces the modulus, increases the gear teeth, increases the meshing coefficient of gear pair, and adopts the helical gear with a large spiral angle of 23-25°, so that the gear transmission is stable, the impact sound of the gear is reduced, and under the principle of avoiding tooth tip interference, the tooth tip height coefficient of the gear is increased from the traditional coefficient 1 to 1.1-1.25, under the same conditions, the noise can be reduced by 3-5 decibels, the easy-to-damage parts can be easily replaced, it is convenient, safe and reliable, can effectively reduce the production cost, and improve the economic benefit of users. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the device structure of the present application;

[0015] Figure 2 It is a schematic diagram of the gear selection and change mechanism structure of the device of the present application;

[0016] Figure 3 It is a schematic diagram of the input shaft and output shaft part structure of the device of the present application;

[0017] Figure 4 It is a schematic diagram of part of the structure of the device of the present application;

[0018] Figure 5 It is a schematic diagram of the input shaft assembly structure of the device of the present application;

[0019] Figure 6 It is a schematic diagram of the telescopic structure of the input shaft assembly of the device of the present application. DETAILED DESCRIPTION

[0020] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described below in combination with embodiments:

[0021] It should be noted that in the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0022] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. Specific embodiments

[0025] For one of the specific embodiments of the present application: see the accompanying drawings.

[0026] In the present embodiment, a high-efficiency convenient low-noise mechanical gearbox, comprising a box body 1, the inner cavity of the box body 1 is provided with output shaft 2, input shaft 3, shift shaft 4, reverse shaft 5, forward shaft 6 which are arranged in parallel, the output shaft 2 is provided with front three output driven gear 21 which rotates synchronously with the output shaft 2 and output gear set 22 which can rotate relative to the output shaft, the input shaft 3 is provided with input driving gear 31 which synchronizes with the input shaft 3 and input gear set 32 which can rotate synchronously with the input shaft 3, the shift shaft 4 is provided with input driven gear 41 which rotates synchronously with the shift shaft 4 and shift gear set 42 which can rotate relative to the shift shaft 4, the reverse shaft 5 is provided with reverse gear set 51 which rotates synchronously with the reverse shaft 5, the forward shaft 6 is provided with forward gear set 61 which rotates synchronously with the forward shaft 6, the input driving gear 31 is engaged with the input driven gear 41, each reverse driving gear in the shift gear set 42 is engaged with the corresponding driven gear in the reverse gear set 51, each reverse forward driving gear in the shift gear set 42 is engaged with the corresponding driven gear in the forward gear set 61, the driving gear in the input gear set 32 is engaged with the corresponding driven gear in the output gear set 22, the box body 1 is provided with a selected shift mechanism 7 which drives the shift shaft, the right end of the output shaft 2 is connected with the differential assembly 9 through the spiral gear pair 8.

[0027] Further, the input gear set 32 comprises a front three output driving gear 33, a front three synchronizer assembly 34, the front three output driving gear 33, the front three synchronizer assembly 34, and the input driving gear 31 are sequentially installed on the input shaft 3, and the front three output driving gear 33 is correspondingly engaged with the front three output driven gear 21 on the output shaft 2.

[0028] Further, the reverse gear set 51 comprises a reverse output driving shaft 52, a reverse first driven gear 53, and a reverse second driven gear 54, which are sequentially installed on the reverse shaft.

[0029] Further, the forward gear set 61 comprises a forward first driven gear 62, a forward output driving gear 63, a reverse output idler gear 64, and a forward second driven gear 65, which are sequentially installed on the forward shaft.

[0030] Further, the gear shifting gear set 42 comprises a first gear set 43 and a second gear set 44, the first gear set 43 sequentially comprises a forward first driving gear 431, a first gear synchronizer assembly 432, and a reverse first driving gear 433, and the second gear set 44 sequentially comprises a forward second driving gear 441, a second gear synchronizer assembly 442, and a reverse second driving gear 443, the reverse first driving gear 433 is correspondingly engaged with the reverse first driven gear 62 on the reverse shaft 5, the reverse second driving gear 443 is correspondingly engaged with the reverse second driven gear 54 on the reverse shaft 5, the forward first driving gear 431 is correspondingly engaged with the forward first driven gear 62 on the forward shaft 6, and the forward second driving gear 441 is correspondingly engaged with the forward second driven gear 65 on the forward shaft 6.

[0031] As a specific embodiment of the present application, further, the output gear set 22 comprises an output driven gear 221 installed on the output shaft, and the corresponding forward first-reverse first and forward second-reverse second operation operations can be realized through the following operation chain, the engine is driven through the corresponding input driving gear 31 on the input shaft 3, and then through the gear shifting shaft, the driven input gear, the forward first driving gear, the first gear synchronizer assembly, the reverse first driving gear, the forward second driving gear, the second gear synchronizer assembly, the reverse second driving gear, the forward shaft, the forward first driven gear, the forward second driven gear, the reverse output idler gear, the forward output driving gear, the output shaft, the output driven gear, the bevel gear pair, the differential assembly, and the drive axle output, to realize the forward first-reverse first and forward second-reverse second operation operations.

[0032] And can quickly realize the direct three-speed speed, its fast transfer operation chain as follows: engine → input shaft, three-speed synchronizer assembly, front three output drive gear → output shaft, front three output driven gear, spiral bevel gear pair, differential assembly → drive axle output, through the input shaft power input, drive input shaft, three-speed synchronizer assembly rotation, with the same on the input shaft on the front three output drive gear, the speed ratio is transmitted to the front three output driven gear and the entire output shaft assembly on the output shaft, realize the input shaft directly power according to the fast transfer speed ratio to the output shaft, can form a unique fast transfer efficiency, the speed can reach 26.5km / h, compared with the double lever box front two speed 17.8km / h, speed up more than 45%, save time, save labor and fuel consumption.

[0033] Further, the said select gear mechanism 7 includes an upper cover 71, the said upper cover 71 is fixed on the box body 1, the inner cavity of the said upper cover 71 is equipped with a first gear shift fork shaft 72, a second gear shift fork shaft 73 and a third gear shift fork shaft 74, the said first gear shift fork shaft 72, the said second gear shift fork shaft 73 and the said third gear shift fork shaft 74 are respectively equipped with a first gear shift fork 75, a second gear shift fork 76 and a third gear shift fork 77, the said first gear shift fork 75 and the said second gear shift fork 76 are respectively equipped on the end of the said first gear shift fork shaft 72 and the said second gear shift fork shaft 73, the upper part of the inner cavity of the said upper cover 71 is movably equipped with a select gear shaft 78, the right end of the said select gear shaft 78 is connected with a control lever 79, the middle part of the said control lever 79 is connected with one end of a select gear arm 710 which is connected with the said select gear shaft 78, the said select gear shaft 78 is equipped with a gear shift knob 711 which is matched with each shift fork shaft, when gear shifting is needed, the control lever 79 is moved left and right in the three shift fork grooves through the gear shift knob 711 of the select gear shaft 78 and the select gear arm 710, then the required first gear, second gear or third gear can be selected, when gear shifting is needed, the control lever 79 is pushed forward or pulled backward, then forward or backward movement can be realized, the left and right movement and the forward and backward push and pull of the single control lever can be linked to easily and conveniently select three forward gears and two reverse gears, which changes the fixed mode of the double lever control high and low gear and meets the pursuit of easy and convenient humanization of the users.

[0034] Further, the input shaft 3 comprises an input shaft A 301 and an input shaft B 302, one end of the input shaft A 301 extends into the inner cavity of the input shaft B 302 and is movably connected with the input shaft B 302, the input shaft B is installed in the upper inner cavity of the box body 1, the outside of the input shaft B 302 is sequentially provided with an input driving gear 31, a three-gear synchronizer assembly 34 and a front three-output driving gear 33, the outside of the input shaft A 301 is movably sleeved with a telescopic sleeve 303, the right end of the telescopic sleeve 303 is located in the inner cavity of a bearing seat 304, the telescopic sleeve 303 is provided with a snap spring B 305 matched with the bearing seat 304 installed on the box body 1, the end of the input shaft A 301 is provided with a snap spring A 306 matched with the telescopic sleeve 304, as shown in the drawings, the bearing seat with involute inner spline is fixed on the input shaft hole bracket of the gearbox shell, the telescopic sleeve with involute outer spline is matched with the inner spline of the bearing seat, and the corresponding snap spring B is positioned; the input shaft A with involute outer spline freely passes through the telescopic sleeve and is matched with the corresponding accessories, the joint is positioned by the snap spring A according to the free passing design requirement, the left end of the input shaft A is connected with the engine output shaft bearing, the right end of the input shaft A is connected with the inner spline of the input shaft B, and the input shaft B with involute inner and outer splines is tightly matched with the corresponding bearing in the inner cavity of the telescopic sleeve at the left end, the right end of the input shaft B is connected with the corresponding bearing in the inner cavity of the box body, so that each component is independent and integrated, can input power into each main transmission chain, ensures the corresponding functions of the input shaft, and because the above-mentioned corresponding components are independently arranged, the requirement of conveniently replacing various damaged components in the clutch part can be met, the snap spring B can be pulled out, the telescopic sleeve can be pushed into the inner cavity of the bearing seat to the limit position to the right, then the snap spring A is pulled out, the input shaft A is pushed into the inner cavity of the telescopic sleeve to the right, and passes through the inner cavity of the input shaft B to the reserved hole of the box body, so that the damaged parts (such as the separating bearing, the friction part and the pressure plate) needed to be replaced can be conveniently taken out from the front end of the input shaft without disassembling the engine or the gearbox, and when restoration is needed, it can also be easily completed, and the damaged parts can be replaced in a few minutes, which is very convenient, safe and reliable.

[0035] The specific embodiments disclosed in the present application fall within the protection scope of the claims of the present application, are specific lower-level implementation ranges of the feature part of the present application, and the protection content of the specific embodiments is only for the description of the protection scope of the claims of the present application. The protection scope of the present application is not limited to the protection content of the specific embodiments, and the protection content of the specific embodiments should not be understood as a limitation on the protection scope of the claims of the present application.

[0036] In addition, the related components not disclosed in the specification and drawings of the present application do not hinder the understanding of the present application by those skilled in the art, and the other conventional components of the present application are not disclosed in the present application, which do not hinder the understanding of the present application by those skilled in the art.

[0037] The product structure connection relationship falling within the protection scope of the present application falls within the protection content of the present application; on the premise of not deviating from the protection essence of the present application, the product component structure is conventionally technically improved, such as the improvement of the product partial structure in the specific embodiment of the present application, which also falls within the protection essence of the present application.

[0038] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that the described embodiments can be modified in various manners without deviating from the scope of the present application by those of ordinary skill in the art. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present application.

[0039] Unless otherwise defined, all academic and scientific terms used herein have the same meaning as understood by those of ordinary skill in the art to which the present application belongs.

[0040] In case of conflict, the definitions in the specification control.

[0041] Unless otherwise stated, all percentages, parts, ratios, etc. are by weight.

[0042] When a numerical value or a range of numerical values, a preferred range or a series of lower preferred values and upper preferred values are given, it should be understood that it specifically discloses any range formed by any pair of numerical values of any smaller range limit or preferred value and any larger range limit or preferred value, regardless of whether the range is disclosed or not. Unless otherwise stated, where numerical ranges are described in the specification, the stated range is intended to include the range end values and all integers and fractions within the range.

[0043] When the term "about" or "around" is used to describe the end value of a numerical value or range, the disclosure should be understood to include the specific numerical value or the involved end value.

[0044] The use of "a" and "an" to describe an element of the present application is only for the convenience and to give a general idea of the present application. Unless otherwise explicitly stated, the description should be understood to include one or at least one.

Claims

1. A high efficiency, convenient, low noise mechanical gearbox comprising a housing, characterized in that: The inner cavity of the box is provided with output shaft, input shaft, shift shaft, reverse shaft and forward shaft which are arranged in parallel, the output shaft is provided with front three output passive gear which rotates synchronously with the output shaft and output gear set which can rotate relative to the output shaft, the input shaft is provided with input driving gear which rotates synchronously with the input shaft and input gear set which can rotate synchronously with the input shaft, the shift shaft is provided with input passive gear which rotates synchronously with the shift shaft and shift gear set which can rotate relative to the shift shaft, the reverse shaft is provided with reverse gear set which rotates synchronously with the reverse shaft, the forward shaft is provided with forward gear set which rotates synchronously with the forward shaft, the input driving gear is engaged with the input passive gear, each reverse driving gear in the shift gear set is engaged with corresponding passive gear in the reverse gear set, each reverse forward driving gear in the shift gear set is engaged with corresponding passive gear in the forward gear set, the driving gear in the input gear set is engaged with corresponding passive gear in the output gear set, the box is provided with shift selecting mechanism which drives the shift shaft, the right end of the output shaft is connected with differential assembly through helical gear pair; The input gear set comprises front three output driving gear and front three synchronizer assembly, the front three output driving gear, the front three synchronizer assembly and the input driving gear are sequentially installed on the input shaft, the front three output driving gear is correspondingly engaged with the front three output passive gear on the output shaft; The shift gear set comprises one gear set and two gear set, the one gear set sequentially comprises front one driving gear, one synchronizer assembly and reverse one driving gear, the two gear set sequentially comprises front two driving gear, two synchronizer assembly and reverse two driving gear, the reverse one driving gear is correspondingly engaged with reverse one passive gear arranged on the reverse shaft, the reverse two driving gear is correspondingly engaged with reverse two passive gear arranged on the reverse shaft, the front one driving gear is correspondingly engaged with front one passive gear arranged on the forward shaft, the front two driving gear is correspondingly engaged with front two passive gear arranged on the forward shaft; The input shaft comprises input shaft A and input shaft B, one end of the input shaft A extends into the inner cavity of the input shaft B and is movably connected with the input shaft B, the input shaft B is installed in the upper inner cavity of the box, the outer part of the input shaft B is sequentially provided with input driving gear, three synchronizer assembly and front three output driving gear, the outer part of the input shaft A movably sleeves the telescopic sleeve, the right end of the telescopic sleeve is located in the inner cavity of the bearing seat, the telescopic sleeve is provided with clasp B which cooperates with the bearing seat installed on the box, the end of the input shaft A is provided with clasp A which cooperates with the telescopic sleeve.

2. A high efficiency, convenient, low noise mechanical gearbox as claimed in claim 1 characterized in that: The reverse gear set comprises reverse output driving shaft, reverse one passive gear and reverse two passive gear which are sequentially installed on the reverse shaft.

3. A high efficiency convenient low noise mechanical gearbox as claimed in claim 1 characterized in that: The forward gear set comprises front one passive gear, forward output driving gear, reverse output idler gear and front two passive gear which are sequentially installed on the forward shaft.

4. A high efficiency convenient low noise mechanical gearbox as claimed in claim 1 characterized in that: The selecting and shifting mechanism comprises an upper cover fixed above the box, and the inner cavity of the upper cover is provided with a first shift fork shaft, a second shift fork shaft and a third shift fork shaft side by side, and the first shift fork shaft, the second shift fork shaft and the third shift fork shaft are respectively provided with a first shift fork, a second shift fork and a third shift fork, the first shift fork and the second shift fork are respectively arranged at the end of the first shift fork shaft and the second shift fork shaft, the upper cover is movably provided with a selecting and shifting shaft at the upper part of the inner cavity, the right end of the selecting and shifting shaft is connected with a control rod, the middle part of the control rod is connected with one end of a selecting and shifting arm which is connected with the selecting and shifting shaft, and the selecting and shifting shaft is provided with a shift head matched with each shift fork shaft.

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