CN218582172U - Forklift gearbox integrated with parking mechanism - Google Patents

Abstract

The utility model discloses an integrated parking mechanism's fork truck gearbox, including the gearbox casing to and input shaft, idler shaft, output shaft, braking axle and the differential mechanism assembly of setting on the gearbox casing, install on the input shaft in the same direction as car clutch and the clutch that backs a car, in the same direction as the advancing gear and the output shaft transmission of car clutch and be connected, the gear that backs a car of clutch passes through the idler shaft and is connected with output shaft transmission, the output shaft is connected with the braking shaft transmission, and parking braking device is all installed at the both ends of braking shaft to two parking braking device all link to each other with the outer wall of gearbox casing, and differential mechanism assembly and braking shaft meshing transmission to make the effect of gearbox braking higher, the stability of braking process is higher, thereby makes the volume of gearbox littleer, and the molding is simpler, can share the lubricating system in the gearbox casing, and need not to worry the leakproofness problem of connecting the position.

Description

Fork truck gearbox of integrated parking mechanism

Technical Field

The utility model relates to a vehicle transmission field especially relates to a fork truck gearbox of integrated parking mechanism.

Background

In the material handling industry, diesel fork lift trucks are widely used. The gearboxes for the internal combustion forklift include common mechanical gearboxes and hydraulic gearboxes. The existing hydraulic transmission has integrated brake for driving and parking, wherein the parking is realized by independently controlling an external energy accumulator, and the parking is realized by separately controlling an internal double piston, but the brake is in a hub brake form. In such a braking mode, when a hydraulic system or a single brake fails, potential safety hazards often occur in the reliability of vehicle body parking.

Patent document CN 111765238A discloses a hydraulic transmission and a parking brake device thereof, which comprises a brake shaft positioned inside a transmission housing through a bearing, and a brake cover connected to the transmission housing; the transmission case is connected with the brake shaft through an inner friction plate pair and an outer friction plate pair, the inner end of the brake cover is connected with a hydraulic driving assembly, and the output end of the hydraulic driving assembly can axially move along the brake shaft and act on the inner friction plate pair and the outer friction plate pair. The inner friction plate pair and the outer friction plate pair comprise a plurality of outer friction plates and inner friction plates which are arranged at intervals, the outer friction plates and the gearbox shell are circumferentially positioned and can move relatively, and the inner friction plates and the brake shaft are circumferentially positioned and can move relatively in the axial direction. A baffle is fixedly connected to the inner end part of the transmission case, and the hydraulic driving assembly and the inner and outer friction plate pairs are arranged in an area enclosed by the baffle, the brake shaft, the transmission case and the brake cover; a guide pin is fixed between the baffle above the inner and outer friction plate pairs and the gearbox shell, and the guide pin is axially parallel to the brake shaft; the outer friction plate and the guide pin are circumferentially positioned and can axially move relatively.

From the disclosure and the drawings of the prior art, it can be obviously seen that the brake of the parking brake device is used as an end cover of the gearbox, but the baffle plate, the inner and outer friction plate pairs and the piston of the parking brake device are still arranged in the gearbox shell, so that the modeling difficulty of the gearbox shell is increased, the volume of the gearbox is increased, the gearbox shell needs to be detached from the whole vehicle when the parking brake device is overhauled, and then the gearbox shell is opened, so that the overhaul can be completed, which wastes time and labor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem among the prior art, the utility model aims to provide a fork truck gearbox of integrated parking mechanism, parking brake device is all installed at the both ends of this gearbox braking axle, thereby make the effect of gearbox braking higher, braking process's stability is higher, and parking brake device is located the outside of gearbox casing and links to each other with the outer wall of gearbox casing, thereby make the volume of gearbox littleer, it is simpler to model, can share the lubricating system in the gearbox casing, and need not worry the leakproofness problem of connecting the position.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a forklift transmission integrating a parking mechanism comprises a transmission case shell, and an input shaft, an idler shaft, an output shaft and a braking shaft which are arranged in the transmission case shell, wherein a forward clutch and a reverse clutch are installed on the input shaft, a forward gear of the forward clutch is meshed with an output gear on the output shaft, a reverse gear of the reverse clutch is meshed with a transmission gear installed on the idler shaft, an idler installed on the idler shaft is meshed with the output gear, a braking bevel gear is further installed on the output shaft, a gear ring meshed with the braking bevel gear is installed on the braking shaft, parking braking devices are installed at two ends of the braking shaft, each parking braking device comprises a brake case fixed to the outer wall of the transmission case shell, the brake case and the braking shaft are connected through inner and outer pairs of friction plates of the parking braking devices, a hydraulic driving component is arranged in the brake case, the output end of the braking hydraulic driving component can axially move along the braking shaft and acts on the inner and outer pairs of the parking braking devices, a differential assembly is further installed on the transmission case shell, outer teeth of the differential assembly are meshed with the friction plates of the braking shaft.

Preferably, the brake housing comprises a brake baffle, a brake holder and a brake cover, the brake baffle is sleeved at the end part of the brake shaft and is fixedly connected with the gearbox housing, two ends of the brake holder are respectively fixedly connected with the brake baffle and the brake cover, the end part of the output shaft extends into the brake holder, and the output shaft is connected with the brake holder through an inner friction plate pair and an outer friction plate pair of the parking brake device.

Preferably, the brake hydraulic driving assembly comprises a brake piston and a brake spring for driving the brake piston; the brake piston is positioned in the brake seat, an annular first limiting bulge is arranged on the inner side of the brake seat in a protruding mode, and a brake hydraulic cavity is formed between the brake piston and the first limiting bulge; one end of the brake spring is abutted against the brake piston, and the other end of the brake spring is abutted against the brake cover; after the brake hydraulic cavity is filled with pressure oil, the brake piston can move axially along the brake shaft to be separated from contact with the inner and outer friction plate pairs of the parking brake device.

Preferably, a first brake spring mounting groove is formed in the inner end surface of the brake cover, a second brake spring mounting groove is formed in the end surface of the brake piston close to the brake cover, and two ends of the brake spring are respectively embedded in the spring mounting grooves of the brake cover and the piston.

Preferably, the brake seat is provided with an oil inlet communicated with the brake hydraulic cavity, and the oil inlet is provided with an oil inlet screw plug.

Preferably, a second limiting bulge is arranged on the output shaft in a protruding mode, and the second limiting bulge is located between the forward clutch and the reverse clutch; the forward gear of the in-sequence clutch is connected with the second limiting bulge through an inner friction plate pair and an outer friction plate pair of the in-sequence clutch, the in-sequence clutch further comprises an in-sequence driving assembly, and the output end of the in-sequence driving assembly can axially move along the input shaft and act on the inner friction plate pair and the outer friction plate pair of the in-sequence clutch; the reversing gear of the reversing clutch is connected with the second limiting protrusion through an inner friction plate pair and an outer friction plate pair of the reversing clutch, the reversing clutch further comprises a reversing driving assembly, and the output end of the reversing driving assembly can axially move along the input shaft and act on the inner friction plate pair and the outer friction plate pair of the reversing clutch.

Preferably, the in-sequence clutch comprises an in-sequence piston, an in-sequence limiting seat and an in-sequence spring, the in-sequence limiting seat is fixed on the input shaft, the in-sequence piston is in splined connection with the input shaft, two ends of the in-sequence spring respectively abut against the in-sequence piston and the in-sequence limiting seat, and an in-sequence hydraulic cavity is arranged between the in-sequence piston and the second limiting protrusion; after the ride-through hydraulic cavity is communicated with pressure oil, the ride-through piston can move axially along the brake shaft to be abutted with the inner friction plate and the outer friction plate of the reversing clutch.

Preferably, the input shaft is provided with a following pressure oil passage for supplying oil to the following hydraulic cavity.

Preferably, the reversing clutch comprises a reversing piston, a reversing limit seat and a reversing spring, the reversing limit seat is fixed on the input shaft, the reversing piston is in splined connection with the input shaft, two ends of the reversing spring are respectively abutted against the reversing piston and the reversing limit seat, and a reversing hydraulic cavity is arranged between the reversing piston and the second limit protrusion; after the reversing hydraulic cavity is communicated with pressure oil, the reversing piston can move axially along the brake shaft and is abutted with the inner friction plate and the outer friction plate of the reversing clutch.

Preferably, the input shaft is provided with a reverse pressure oil passage for supplying oil to the reverse hydraulic cavity.

The technical scheme of the utility model beneficial effect does: the output shaft of the gearbox for output and the braking shaft for braking are connected through the bevel gear and the gear ring, so that the output direction of the gearbox is not changed, the length of the output shaft of the gearbox is not prolonged, and structures such as a shell of the parking braking device are arranged outside the shell of the gearbox, so that the parking braking device of the manual forklift is integrated into a whole vehicle control system through the scheme, the size of a front axle is reduced, and the safety of a driver is improved when people and vehicles are separated; and both ends of the brake shaft are provided with the parking brake devices, compared with unilateral braking, the braking force of the scheme is stronger, and the braking process and the braking effect are more stable; the parking brake device has the advantages that the brake clutch part of the parking brake device in the gearbox is completely outside the gearbox shell, a lubricating system in the gearbox shell can be shared, the sealing performance of the connecting part of the gearbox shell and the brake shell is only required to be ensured, and the problem of sealing performance caused by the connection of a plurality of shells is avoided; the advantage of this scheme still lies in, owing to be used for braking parking brake device to install at gearbox box outer wall, need not to open the gearbox then at parking brake device's dismouting maintenance for parking brake device's dismantlement process is more convenient.

Drawings

Fig. 1 is a schematic structural view of a transmission case of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

fig. 3 is a schematic structural view of the middle parking device of the present invention;

FIG. 4 is an enlarged view of FIG. 3 at B;

fig. 5 is a hydraulic schematic of the transmission.

Reference numerals: 1. a transmission housing; 11. a differential assembly; 12. a ring gear; 2. a torque converter; 21. inputting a board; 3. an input shaft; 31. a forward clutch; 311. a forward gear; 312. forward the piston; 313. a forward spacing seat; 314. a forward spring; 315. passing an outer friction plate; 316. an inner friction plate is sequentially driven; 317. passing a friction plate baffle; 318. a forward hydraulic chamber; 32. a reverse clutch; 321. a reverse gear; 322. a reversing piston; 323. a reversing limit seat; 324. a reversing spring; 325. a reversing outer friction plate; 326. a reversing inner friction plate; 327. a backing friction plate baffle plate; 328. a reversing hydraulic chamber; 33. a follow-up pressure oil duct; 34. a reversing pressure oil duct; 35. a mounting seat; 36. a second limit bulge; 4. an idler shaft; 41. a transmission gear; 42. an idler pulley; 5. an output shaft; 51. an output gear; 52. braking the bevel gear; 6. a brake shaft; 61. a ring gear; 7. a parking brake device; 71. a brake baffle; 72. a brake seat; 721. a first limit protrusion; 73. a brake cover; 74. a brake piston; 741. an output section; 75. a brake spring; 76. braking the outer friction plate; 77. braking the inner friction plate; 78. a brake hydraulic chamber; 79. an oil inlet; 8. an oil inlet plug screw; 91. an oil inlet pipe of a parking brake valve; 92. a parking brake valve; 93. an oil inlet pipe is parked.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

1-5, the forklift transmission integrating the parking mechanism comprises a transmission housing 1, and an input shaft 3, an idler shaft 4, an output shaft 5 and a brake shaft 6 which are arranged in the transmission housing 1, wherein a torque converter 2 is installed on an input end of the input shaft 3, power of an engine can enter the transmission through an input plate 21 of the torque converter 2, a forward clutch 31 and a reverse clutch 32 are installed on the input shaft 3, a forward gear 311 of the forward clutch 31 is meshed with an output gear 51 on the output shaft 5, a reverse gear 321 of the reverse clutch 32 is meshed with a transmission gear 41 installed on the idler shaft 4, an idler gear 42 meshed with the output gear 51 is also installed on the idler shaft 4, a brake bevel gear 52 is also installed on the output shaft 5, a gear ring 61 meshed with the brake bevel gear 52 is installed on the brake shaft 6, two ends of the brake shaft 6 are both provided with a parking brake device 7, the parking brake device 7 comprises a brake housing fixed on the outer wall of the transmission housing 1, the brake housing is connected with the brake shaft 6 through an inner friction plate and an outer friction plate, a brake driving assembly is arranged in the brake housing, and a hydraulic auxiliary shaft driving assembly is capable of axially acting on the inner and outer friction plate of axially acting on the transmission shaft; a differential assembly 11 is further mounted on the gearbox housing 1, the differential assembly 11 comprises a ring gear 12, and external teeth of the ring gear 12 are meshed with external teeth arranged on the brake shaft, so that the differential assembly and the brake shaft are in transmission connection.

In the scheme, the output shaft 5 for outputting and the brake shaft 6 for braking of the gearbox are connected with the gear ring 61 through the bevel gear, so that the output direction of the gearbox is not changed, the length of the output shaft 5 of the gearbox is not prolonged, and structures such as a shell of the parking brake device 7 are arranged outside the gearbox shell 1, so that the parking brake device 7 of the manual forklift is integrated into a whole vehicle control system through the scheme, the size of a front axle is reduced, and the safety of a driver is improved when a person and a vehicle are separated; and both ends of the brake shaft 6 are provided with the parking brake devices 7, compared with unilateral braking, the braking force of the scheme is stronger, and the braking process and the braking effect are more stable; the parking brake device 7 in the transmission has the advantages that the brake clutch part is completely outside the transmission shell 1, a lubricating system in the transmission shell 1 can be shared, the sealing performance of the connecting part of the transmission shell 1 and the brake shell is ensured, and the sealing problem caused by the connection of a plurality of shells is avoided; the advantage of this scheme still lies in, owing to be used for braking parking brake device 7 to install at gearbox box outer wall, need not to open the gearbox at parking brake device 7's dismouting maintenance then for parking brake device 7's dismantlement process is more convenient.

In this embodiment, as shown in fig. 3 and 4, the brake housing includes a brake baffle 71, a brake seat 72 and a brake cover 73, the brake baffle 71 is sleeved on an end of the brake shaft 6 and is fixedly connected with the transmission housing 1, two ends of the brake seat 72 are respectively fixedly connected with the brake baffle 71 and the brake cover 73, an end of the output shaft 5 extends into the brake seat 72, and the output shaft 5 is connected with the brake seat 72 through an inner friction plate pair and an outer friction plate pair; the structure enables the brake shell to be disassembled in a split mode, and the installation difficulty of the brake is further simplified.

Further preferably, the brake hydraulic driving assembly includes a brake piston 74, and a brake spring 75 for driving the brake piston 74; the brake piston 74 is positioned in the brake seat 72, an annular first limiting protrusion 721 protrudes from the inner side of the brake seat 72, the brake piston 74 includes a piston body, an output part 741 protrudes from the piston body, the piston body of the brake piston 74 is matched with an inner hole of the brake seat 72, the output part 741 of the brake piston 74 is matched with the inner wall of the first limiting protrusion 721 and abuts against a friction plate pair of the parking brake device 7 after penetrating through the first limiting protrusion 721, the piston body is positioned at the outer side of the first limiting protrusion 721, a brake hydraulic chamber 78 is formed between the piston body and the first limiting protrusion 721, a sealing ring for preventing pressure oil leakage is arranged between the piston body and the brake seat 72, and a sealing ring for preventing pressure oil leakage is arranged between the output end of the brake piston 74 and the first limiting protrusion 721; one end of the brake spring 75 abuts against the brake piston 74, and the other end abuts against the brake cover 73; after the brake hydraulic chamber 78 is filled with pressurized oil, the brake piston 74 can move axially along the brake shaft 6 out of contact with the inner and outer friction plate pairs. In the structure, under the condition that the brake hydraulic cavity 78 is not filled with pressure oil, the parking brake device 7 is in a braking state, namely when the forklift is not started, the gearbox realizes self-locking, and the safety of a vehicle and a driver after people and the vehicle are separated is improved. Furthermore, a first brake spring mounting groove is formed in the end surface of the inner side of the brake cover 73, a second brake spring mounting groove is formed in the end surface of the brake piston 74 close to the brake cover 73, and two ends of the brake spring 75 are respectively embedded in the spring mounting grooves of the brake cover 73 and the piston. The above structure provides power for self-locking of the gearbox and also makes the structure of the parking brake device 7 more compact. Further, an oil inlet 79 communicated with the brake hydraulic cavity is formed in the brake base 72, and an oil inlet screw plug 8 is installed at the oil inlet. In this way, the arrangement and connection of the pressure oil system is facilitated. Further, the inner and outer friction plate pairs of the parking brake device 7 include a plurality of inner brake friction plates 77 and a plurality of outer brake friction plates 76 alternately arranged therewith, the plurality of inner brake friction plates are all sleeved on the end of the brake shaft and are in spline connection, and the plurality of outer brake friction plates are located between the first limiting protrusions of the brake seat and the brake baffle and are in sliding connection with the brake seat or the brake baffle.

In this embodiment, as shown in fig. 1 and fig. 2, a second limiting protrusion 36 protrudes from the output shaft 5, and the second limiting protrusion 36 is located between the forward clutch 31 and the reverse clutch 32; the forward gear 311 of the sequential clutch 31 is connected with the second limiting protrusion 36 through an inner friction plate pair and an outer friction plate pair, the sequential clutch 31 further comprises a sequential driving assembly, and the output end of the sequential driving assembly can axially move along the input shaft 3 and act on the inner friction plate pair and the outer friction plate pair of the sequential clutch 31; the reverse gear 321 of the reverse clutch 32 is connected with the second limiting protrusion 36 through an inner and outer friction plate pair, the reverse clutch 32 further includes a reverse driving assembly, and an output end of the reverse driving assembly can axially move along the input shaft 3 and act on the inner and outer friction plate pairs of the reverse clutch 32. The forward clutch 31 and the reverse clutch 32 in the above scheme have certain universality, and the friction plates of the two clutches are connected with the second limiting protrusion 36, so that the structure for gear shifting in the gearbox is greatly simplified, the structure of the gearbox can be more compact, and the volume of the gearbox is smaller.

In order to better realize the gear shifting function of the gearbox, in the embodiment, the gearbox further comprises an annular mounting seat 35, and a connecting part protrudes inwards from the middle position of the mounting seat 35, is inserted between the forward clutch 31 and the reverse clutch 32, and is fixedly connected with the second limiting protrusion 36.

Regarding the sequential clutch 31, the sequential clutch 31 includes a sequential piston 312, a sequential spring 314 and a sequential limiting seat 313, the sequential limiting seat 313 is fixed on the input shaft 3, the sequential piston 312 is connected with the input shaft 3 by a spline so that the sequential piston can move axially along the input shaft 3, two ends of the sequential spring 314 respectively abut against the sequential piston 312 and the sequential limiting seat 313, a first sealing bulge extending towards the sequential limiting seat 313 protrudes from one end of the sequential piston 312, a sealing ring for preventing pressure oil leakage is arranged between the first sealing bulge and the input shaft 3, a second sealing bulge extending towards the position of the second limiting bulge protrudes from the other end of the sequential piston 312, and a sealing structure for preventing pressure oil leakage is arranged between the second sealing bulge and a connecting part of the mounting seat 35 or the second limiting bulge 36 of the input shaft 3; the ride-through piston 312, the input shaft 3, the second limiting protrusion 36 and the connecting part are enclosed to form a ride-through hydraulic cavity 318, and the input shaft 3 is provided with a ride-through pressure oil channel 33 for supplying oil to the ride-through hydraulic cavity 318; after the ride-through hydraulic chamber 318 is filled with pressurized oil, the ride-through piston 312 can move axially along the input shaft 3 to act on the inner and outer friction plates of the ride-through clutch. Furthermore, a first installation part protrudes from the end surface of the forward gear 311 of the in-order clutch 31, the first installation part extends into the inner side of the installation seat 35, a plurality of in-order vehicle inner friction plates 316 of the in-order vehicle clutch 31 are all sleeved on the first installation part and are in spline connection, a plurality of in-order vehicle outer friction plates 315 of the in-order vehicle clutch 31 are all located on the inner side of the installation seat 35 and are in sliding connection, in-order vehicle inner friction plates and in-order vehicle outer friction plates of the in-order vehicle clutch 31 are alternately arranged, and one end of the installation seat is fixed with an in-order vehicle friction plate baffle 317, so that the in-order vehicle inner friction plates and the in-order vehicle outer friction plates 315 of the in-order vehicle clutch 31 are limited between the in-order vehicle piston and the in-order vehicle friction plate baffle 317.

Regarding the reversing clutch 32, the reversing clutch 32 includes a reversing piston 322, a reversing spring 324 and a reversing limit seat 323, the reversing limit seat 323 is fixed on the input shaft 3, the reversing piston 322 is in spline connection with the input shaft 3 so that the reversing piston can move axially along the input shaft 3, two ends of the reversing spring 324 respectively abut against the reversing piston 322 and the reversing limit seat 323, one end of the reversing piston 322 protrudes a third sealing protrusion extending to the reversing limit seat 323, a sealing ring for preventing pressure oil leakage is arranged between the third sealing protrusion and the input shaft 3, a fourth sealing protrusion protrudes from the other end of the reversing piston 322, and a sealing structure for preventing pressure oil leakage is arranged between the connecting part of the fourth sealing protrusion and the mounting seat 35 or between the second limit protrusion 36 of the input shaft 3; the reversing piston 322, the input shaft 3, the second limiting bulge 36 and the connecting part are enclosed to form a reversing hydraulic cavity 328, and the input shaft 3 is provided with a reversing pressure oil channel 34 for supplying oil to the reversing hydraulic cavity 328; after the reverse hydraulic chamber 328 is filled with pressurized oil, the reverse piston 322 can move axially along the brake shaft 6 to abut against the inner and outer friction plates. Furthermore, a second installation part is protruded on the end face of the forward gear 311 of the reversing clutch 32, the second installation part extends into the inner side of the installation seat 35, a plurality of reversing inner friction plates 326 of the reversing clutch 32 are all sleeved on the second installation part and are in spline connection, a plurality of reversing outer friction plates 325 of the reversing clutch 32 are all located on the inner side of the installation seat 35 and are in sliding connection, reversing inner friction plates and reversing outer friction plates of the reversing clutch 32 are alternately arranged, a reversing friction plate baffle 327 is fixed at the other end of the installation seat, and inner and outer friction plate pairs of the reversing clutch 32 are located between a reversing piston and the reversing friction plate baffle.

The structure of the forward clutch 31 and the reverse clutch 32 in the structure has certain universality, and the outer friction plate of the forward clutch 31 and the outer friction plate of the reverse clutch 32 share one mounting seat 35, so that the structure of gear shifting is simpler, and the consistency of the forward clutch and the reverse clutch is better.

For the differential assembly structure in this embodiment, reference may be made to patent documents with publication numbers CN106678327B and CN 110195773A.

In this embodiment, the transmission is further provided with an oil pump, the oil pump is connected with the parking brake valve 92 through a parking brake valve oil inlet pipe 91, and the parking brake valve is connected with an oil inlet plug screw installed on the brake base 72 through a parking brake valve oil inlet pipe 93. This allows the hydraulic oil to enter and exit the brake hydraulic chamber 78 of the parking brake device 7.

When the gearbox works, the engine power is transmitted to the torque converter 2 from the input plate 21, and then is transmitted to the input shaft 3 through the torque conversion function of the torque converter 2, when the forward gear is engaged, the forward gear clutch works, oil is fed into the forward hydraulic cavity 318 of the forward gear clutch 31, the forward piston 312 of the forward gear clutch 31 axially moves to enable inner and outer friction plates of the forward gear clutch 31 to be abutted, so that the forward gear 311 is driven to rotate, the reverse gear 321 of the reverse gear clutch 32 idles, and the power transmission sequence during the forward gear is that the input shaft 3 → the forward gear 31 → the forward gear 311 → the output gear 51 → the output shaft 5 → the brake bevel gear 52 → the gear ring 61 → the brake shaft 6 → the parking brake device 7;

when the vehicle is in a reverse gear, the reverse gear clutch works, the reverse hydraulic cavity 328 of the reverse clutch 32 is filled with oil, the reverse piston 322 of the reverse clutch 32 moves axially to enable inner and outer friction plates of the reverse clutch 32 to abut against each other, so that the reverse gear 321 is driven to rotate, the forward gear of the forward clutch 31 idles, and the power transmission sequence during reverse is, namely, the input shaft 3 → the reverse clutch 32 → the reverse gear 321 → the intermediate transmission gear 41 → the idle gear 42 shaft 4 → the idle gear 42 → the output gear 51 → the output shaft 5 → the brake bevel gear 52 → the ring gear 61 → the brake shaft 6 → the parking brake device 7.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (10)

1. The utility model provides an integrated parking mechanism's fork truck gearbox, includes gearbox housing (1) to and input shaft (3), idler shaft (4), output shaft (5) and brake axle (6) of setting on gearbox housing (1), its characterized in that: a differential assembly (11) is further installed on the gearbox shell (1), a forward clutch (31) and a reverse clutch (32) are installed on the input shaft (3), a forward gear (311) of the forward clutch (31) is sleeved on the input shaft (3) in an empty mode, the forward gear (311) of the forward clutch (31) is meshed with an output gear (51) on the output shaft (5), a reverse gear (321) of the reverse clutch (32) is sleeved on the input shaft (3) in an empty mode, the reverse gear (321) of the reverse clutch (32) is meshed with a transmission gear (41) installed on an idler shaft (4), and an idler gear (42) installed on the idler shaft (4) is meshed with the output gear (51), still install braking bevel gear (52) on output shaft (5), install ring gear (61) with braking bevel gear (52) meshing on braking axle (6), parking arresting gear (7) are all installed at the both ends of braking axle (6), parking arresting gear (7) include with the fixed stopper casing of gearbox housing (1) outer wall, be connected through the inside and outside friction disc pair of parking arresting gear (7) between stopper casing and braking axle (6), are provided with braking hydraulic drive assembly in the stopper casing, braking hydraulic drive assembly's output can be followed braking axle (6) axial motion and acted on in An inner friction plate pair and an outer friction plate pair of the parking braking device (7), a differential mechanism assembly (11) and the braking shaft (6) are in meshing transmission through gears.

2. The parking mechanism integrated forklift transmission according to claim 1, wherein: the brake shell comprises a brake baffle plate (71), a brake seat (72) and a brake cover (73), wherein the brake baffle plate (71) is sleeved at the end part of the brake shaft (6) and is fixedly connected with the gearbox shell (1), two ends of the brake seat (72) are respectively fixedly connected with the brake baffle plate (71) and the brake cover (73), the end part of the output shaft (5) extends into the brake seat (72), and the output shaft (5) is connected with the brake seat (72) through an inner friction plate pair and an outer friction plate pair of the parking brake device (7).

3. The forklift gearbox integrated with parking mechanism as claimed in claim 2, characterized in that: the brake hydraulic driving assembly comprises a brake piston (74) and a brake spring (75) for driving the brake piston (74); the brake piston (74) is positioned in the brake seat (72), an annular first limiting bulge (721) protrudes from the inner side of the brake seat (72), and a brake hydraulic cavity (78) is formed between the brake piston (74) and the first limiting bulge (721); one end of the brake spring (75) abuts against the brake piston (74), and the other end abuts against the brake cover (73); after the brake hydraulic chamber (78) is filled with pressure oil, the brake piston (74) can move along the axial direction of the brake shaft (6) and is separated from contact with an inner friction plate pair and an outer friction plate pair of the parking brake device (7).

4. The forklift gearbox integrated with parking mechanism as claimed in claim 3, characterized in that: a first brake spring mounting groove is formed in the end face of the inner side of the brake cover (73), a second brake spring mounting groove is formed in the end face, close to the brake cover (73), of the brake piston (74), and two ends of the brake spring (75) are embedded in the spring mounting grooves of the brake cover (73) and the piston respectively.

5. The forklift gearbox integrated with parking mechanism as claimed in claim 3, characterized in that: an oil inlet (79) communicated with the brake hydraulic cavity (78) is formed in the brake base (72), and an oil inlet screw plug (8) is installed at the oil inlet (79).

6. The parking mechanism integrated forklift transmission according to claim 1, wherein: a second limiting bulge (36) is arranged on the output shaft (5) in a protruding mode, and the second limiting bulge (36) is located between the forward clutch (31) and the reverse clutch (32); a forward gear (311) of the forward clutch (31) is connected with the second limiting protrusion (36) through an inner friction plate pair and an outer friction plate pair of the forward clutch (31), the forward clutch (31) further comprises a forward driving assembly, and the output end of the forward driving assembly can axially move along the input shaft (3) and act on the inner friction plate pair and the outer friction plate pair of the forward clutch (31); the reversing gear (321) of the reversing clutch (32) is connected with the second limiting bulge (36) through an inner friction plate pair and an outer friction plate pair of the reversing clutch (32), the reversing clutch (32) further comprises a reversing driving assembly, and the output end of the reversing driving assembly can axially move along the input shaft (3) and act on the inner friction plate pair and the outer friction plate pair of the reversing clutch (32).

7. The forklift gearbox integrated with parking mechanism as recited in claim 6, characterized in that: the sequential clutch (31) comprises a sequential piston (312), a sequential limiting seat (313) and a sequential spring (314), the sequential limiting seat (313) is fixed on the input shaft (3), the sequential piston (312) is in spline connection with the input shaft (3), two ends of the sequential spring (314) respectively abut against the sequential piston (312) and the sequential limiting seat (313), and a sequential hydraulic cavity (318) is arranged between the sequential piston (312) and the second limiting bulge (36); after the forward hydraulic cavity (318) is filled with pressure oil, the forward piston (312) can move along the axial direction of the brake shaft (6) to be abutted against inner and outer friction plates of the reverse clutch (32).

8. The forklift gearbox integrated with parking mechanism as recited in claim 7, characterized in that: the input shaft (3) is provided with a forward driving pressure oil passage (33) for supplying oil to the forward driving hydraulic cavity (318).

9. The forklift gearbox integrated with parking mechanism as recited in claim 6, characterized in that: the reversing clutch (32) comprises a reversing piston (322), a reversing limiting seat (323) and a reversing spring (324), the reversing limiting seat (323) is fixed on the input shaft (3), the reversing piston (322) is in spline connection with the input shaft (3), two ends of the reversing spring (324) respectively abut against the reversing piston (322) and the reversing limiting seat (323), and a reversing hydraulic cavity (328) is arranged between the reversing piston (322) and the second limiting protrusion (36); after the reverse hydraulic chamber (328) is filled with pressure oil, the reverse piston (322) can move along the axial direction of the brake shaft (6) to be abutted against inner and outer friction plates of the reverse clutch (32).

10. The parking mechanism integrated forklift transmission according to claim 9, wherein: the input shaft (3) is provided with a reverse pressure oil passage (34) for supplying oil to the reverse hydraulic cavity (328).

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