Gearbox with parking braking mechanism and oil guide sleeve

Abstract

The utility model discloses a gearbox with a parking braking mechanism and an oil guide sleeve, which comprises a gearbox shell, a driving shaft and a driven shaft are arranged in the gearbox shell, the parking braking mechanism is further arranged at the position, corresponding to the driving shaft, in the gearbox shell, and a driven gear is arranged on the driven shaft. An oil guide sleeve is arranged at the position, corresponding to the driven gear, of the lower portion of the gearbox shell, and an oil guide groove is formed in the oil guide sleeve. According to the gearbox with the parking braking mechanism and the oil guide sleeve, the parking braking mechanism is arranged at the position, corresponding to the driving shaft, in the gearbox shell, so that the effect of automatic parking can be achieved when a vehicle stops, and the situation that the vehicle slides on a slope and even accidents happen is effectively avoided; and the oil guide sleeve and the oil guide groove are arranged in the gearbox shell, so that the conditions of oiliness failure, poor lubricating effect and oil temperature rise caused by splashing and bubbling of lubricating oil can be effectively avoided, the lubricating effect is good, the lubricating oil is not easy to bubble, and the oil temperature in the gearbox is not easy to rise.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery steering bridges, in particular to a gearbox with a parking brake mechanism and an oil guide sleeve. Background Art

[0002] A gearbox, also known as a transmission, is a mechanism used to change the speed and torque from the engine. It can fix or change the transmission ratio of the output shaft and the input shaft in a fixed or phased manner. The automobile transmission realizes gear shifting according to this basic principle. Since the output shaft of the engine rotates at high speed when the vehicle is driving, it is easy to cause the oil temperature in the gearbox to be too high, affecting its service life. In construction machinery and various types of moving vehicles, a parking mechanism is usually set between the gearbox and the drive shaft of the axle to ensure the stability of the vehicle when it stops. However, most traditional construction machinery or various types of moving vehicles are currently equipped with manual parking mechanisms. When the vehicle stops, the driver needs to manually press the brake handle to perform the parking brake to prevent the vehicle from sliding down the slope. However, the driver often forgets to press the brake handle after parking, causing the vehicle to slide down the slope and even cause an accident.

[0003] In view of this, the applicant conducted in-depth research on the above issues, which led to the present case. Summary of the Invention

[0004] The purpose of the present utility model is to provide a transmission with a parking brake mechanism and an oil guide sleeve, so as to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solution:

[0006] The transmission case has a plurality of locking portions, each of which is connected to the transmission case and has a plurality of locking portions, each of which is connected to the transmission case by a plurality of locking portions. The plurality of locking portions are connected to the transmission case by a plurality of locking portions.

[0007] The driving shaft is provided with a plurality of driving gears, the driven shaft is provided with a plurality of driven gears meshing with the driving gears, the lower part of the gearbox housing is provided with an oil guide sleeve corresponding to the position of the driven gears, the oil guide sleeve is fixed in the gearbox housing, the oil guide sleeve is provided with an oil guide groove corresponding to the position of each driven gear, and the lower part of each driven gear is located in the oil guide groove.

[0008] Furthermore, two driven gears are provided on the driven shaft, and the two driven gears are arranged adjacent to each other. A sliding gear sleeve for shifting gears is provided between the two driven gears. Three oil guide grooves are correspondingly provided in the oil guide sleeve, and each of the oil guide grooves is adjacently spaced apart by partitions. The sliding gear sleeve and the lower parts of the two driven gears are respectively arranged in the corresponding oil guide grooves.

[0009] Furthermore, an oil inlet hole is provided at the bottom of each oil guide groove, and each oil inlet hole is located at the bottom of the corresponding oil guide groove.

[0010] Furthermore, the free end is provided with an external spline at a position corresponding to the brake pad, and the brake pad is provided with an internal spline engaged with the external spline, and the brake pad is fixed to the free end by the cooperation of the internal spline and the external spline.

[0011] Furthermore, the parking brake mechanism also includes a mechanical release mechanism, which includes a release bolt passed through the mounting flange, the release bolt extending from the outside of the mounting flange into the gearbox housing and passed through the piston guide sleeve, the end of the release bolt located outside the mounting flange is the outer end, and a release nut is provided on the outer end, and the end of the release bolt located on the piston guide sleeve is the inner end, and a fixing nut is provided on the inner end.

[0012] Furthermore, the mechanical release mechanism is further provided with a latch for fixing the release nut to the release bolt, and screw holes for inserting the latch are provided on the outer end of the release bolt and the release nut.

[0013] By adopting the above-mentioned design scheme, the beneficial effects of the utility model are:

[0014] The transmission with a parking brake mechanism and an oil guide sleeve of the utility model can achieve the effect of automatic parking when the vehicle stops by arranging the parking brake mechanism at a position corresponding to the driving shaft in the transmission housing, effectively avoiding the situation where the vehicle rolls down a slope and thus an accident occurs. In addition, the transmission housing is provided with an oil guide sleeve and an oil guide groove, which can effectively avoid the situation where the lubricating oil splashes and bubbles everywhere, resulting in oil failure, poor lubrication effect and increased oil temperature. The lubrication effect is better, and the lubricating oil is not easy to bubble, which can also prevent the oil temperature in the transmission from increasing.

[0015] Furthermore, an oil inlet hole is provided at the bottom of each oil guide groove, and each oil inlet hole is located at the bottom of the corresponding oil guide groove, so that the lubricating oil at the bottom of the transmission housing can enter the oil guide groove through the oil inlet hole to replenish the lubricating oil to the oil guide groove, thereby ensuring the minimum oil level under the high-speed operation of the driven gear and stably supplying oil to the driven gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of a gearbox with a parking brake mechanism and an oil guide sleeve according to the present invention.

[0017] Figure 2 This is a structural schematic diagram of the oil guide sleeve and the driven gear in the gearbox with a parking brake mechanism and an oil guide sleeve of the present invention in a disassembled state.

[0018] Figure 3 It is a structural diagram of the oil guide sleeve and the driven gear in the gearbox with a parking brake mechanism and an oil guide sleeve of the present invention.

[0019] In the picture:

[0020] 1- Gearbox housing;

[0021] 11-driving shaft; 12-driven shaft;

[0022] 111-external spline; 120-adjusting fork;

[0023] 121-driven gear; 122-sliding gear sleeve;

[0024] 2-parking brake mechanism; 21-mounting flange;

[0025] 22-brake pad; 23-friction plate;

[0026] 24-piston guide sleeve; 25-disc spring;

[0027] 26- oil inlet channel; 3- oil guide sleeve;

[0028] 31- oil guide groove; 32- oil inlet hole;

[0029] 4-Mechanical release mechanism; 41-Release bolt;

[0030] 42-Release the nut; 43-Fix the nut. DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figures 1 to 3 As shown, a gearbox with a parking brake mechanism and an oil guide sleeve includes a gearbox housing 1, a driving shaft 11 rotatably arranged on the upper part of the gearbox housing 1, and a driven shaft 12 rotatably arranged on the lower part of the gearbox housing 1. The driving shaft 11 is fixed with a plurality of driving gears (not shown in the figure), and the driven shaft 12 is fixed with a plurality of driven gears 121 engaged with the driving gears. An adjustment fork 120 and a sliding gear sleeve 122 are further provided between the driving shaft 11 and the driven shaft 12. One end of the driving shaft 11 is a fixed end connected to the output end of the engine (not shown in the figure), and the other end is a free end. One end of the driven shaft 12 is connected to the output end of the engine (not shown in the figure). connected to a differential (not shown in the figure); it should be noted that the structure of the above-mentioned driving shaft 11, driven shaft 12, adjustment fork 120 and sliding gear sleeve 122 is the same as the structure of the driving shaft, driven shaft, adjustment fork and sliding gear sleeve in an existing conventional gearbox, that is, the driving gear on the driving shaft 11 is engaged with the driven gear 121 on the driven shaft 12 through the adjustment fork 120 and the sliding gear sleeve 122, and the adjustment fork 120 drives the sliding gear sleeve 122 to engage with the driven gears 121 of different diameters to achieve gear (speed) changes, thereby transmitting the power of the engine through the driven shaft 12 to subsequent transmission components.

[0033] Unlike the prior art, a parking brake mechanism 2 is further provided in the gearbox housing 1 at a position corresponding to the free end of the driving shaft 11. The parking brake mechanism 2 includes a mounting flange 21 fixed to the gearbox housing 1, a brake pad 22 sleeved on the free end, friction pads 23 located on both sides of the brake pad 22, a piston guide sleeve 24 provided corresponding to the friction pad 23, and a disc spring 25 provided between the piston guide sleeve 24 and the mounting flange 21. Specifically, the mounting flange 21 is fixed to the side of the gearbox housing 1 away from the fixed end of the driving shaft 11, and an external spline 111 is provided at the free end of the driving shaft 11 corresponding to the position of the brake pad 22. An internal spline 111 is provided in the brake pad 22, and the brake pad 22 is engaged with the external spline 111 through the internal spline. The mating sleeve of the spline 111 is fixed on the free end and rotates with the driving shaft 11. The friction plate 23 can be moved left and right in the transmission housing 1 and is located on both sides of the brake plate 22. There is a gap between the brake plate 22 and the friction plate 23; the piston guide sleeve 24 is sealed with the inner wall of the transmission housing 1, and the piston guide sleeve 24 can be moved left and right in the transmission housing 1. One end of the piston guide sleeve 24 is pressed against the disc spring 25, and the other end of the piston guide sleeve 24 is arranged toward the position of the friction plate 23, so that the piston guide sleeve 24 can press against the friction plate 23 when the disc spring 25 bounces up. There is an oil filling space for hydraulic oil to enter between the piston guide sleeve 24 and the transmission housing 1, and the transmission housing 1 is provided with an oil inlet channel 26 at the position corresponding to the oil filling space.

[0034] When the vehicle is parked, the engine stops running, and the disc spring 25 pushes the piston guide sleeve 24 through the rebound force, so that the piston guide sleeve 24 moves toward the position of the friction plate 23 and presses the friction plate 23 tightly, so that the friction plate 23 presses the brake pad 22. The friction force generated by the friction plate 23 and the brake pad 22 stops the driving shaft 11, and the vehicle realizes the parking brake function. When the vehicle releases the parking brake, the engine starts, and the hydraulic oil enters the oil filling space from the oil inlet channel 26 again, pushing the piston guide sleeve 24 to be squeezed in the direction of the disc spring 25, and the piston guide sleeve 24 leaves the friction plate 23, and the friction plate 23 and the brake pad 22 are separated, and the parking brake force is released.

[0035] An oil guide sleeve 3 is provided at the position of the driven gear 121 at the lower part of the gearbox housing 1. The oil guide sleeve 3 is fixed in the gearbox housing 1. The shape of the oil guide sleeve 3 is an arc shape corresponding to the shape of the driven gear 121. An oil guide groove 31 is provided at the position corresponding to each driven gear 121 in the oil guide sleeve 3. The lower part of each driven gear 121 is located in the oil guide groove 31. Specifically, two driven gears 121 are provided on the driven shaft 12 of this embodiment. The two driven gears 121 are arranged adjacent to each other, and a sliding gear sleeve 122 for shifting is provided between the two driven gears 121. Correspondingly, three oil guide grooves 31 are correspondingly provided in the oil guide sleeve 3. The oil guide grooves 31 are adjacently spaced apart by partitions, and the sliding gear sleeve 122 and the lower parts of the two driven gears 121 are respectively arranged in the corresponding oil guide grooves 31.

[0036] An oil guide sleeve 3 is provided at the lower part of the gearbox housing 1, and the lower part of the driven gear 121 is located in the oil guide groove 31, so that when the driven gear 121 rotates in the oil guide groove 31, the lubricating oil in the oil guide groove 31 will not splash around, which can effectively avoid the oil failure, poor lubrication effect and oil temperature increase caused by the splashing and bubbling of the lubricating oil. The lubrication effect is good, and the lubricating oil is not easy to bubble, which can also make the oil temperature in the gearbox not easy to increase. Moreover, the lubricating oil in the oil guide groove 31 can be driven by the driven gear 121 and thrown upward along the oil guide groove 31 to the driving shaft 11, thereby lubricating the driving shaft 11 and the driving gear, further enhancing the lubrication effect.

[0037] Preferably, an oil inlet hole 32 is provided at the bottom of each oil guide groove 31, and each oil inlet hole 32 is located at the bottom of the corresponding oil guide groove 31; since the oil inlet hole 32 is provided at the bottom of the oil guide groove 31, when the driven gear 121 rotates at high speed, the lubricating oil level in the oil guide groove 31 will continue to drop, and the high-speed rotation of the driven gear 121 will cause negative pressure to be generated in the oil guide groove 31, so that the driven gear 121 can suck the lubricating oil at the bottom of the transmission housing 1 into the oil guide groove 31 through the oil inlet hole 32 when rotating. The lubricating oil at the bottom of the transmission housing 1 enters the oil guide groove 31 through the oil inlet hole 32, replenishing the lubricating oil to the oil guide groove 31, that is, ensuring the minimum oil level under the high-speed operation of the driven gear 121, and stably supplying oil to the driven gear 121.

[0038] In order to avoid the situation that the parking brake mechanism 2 locks the driving shaft 11 due to engine failure after parking, causing the wheels to be unable to rotate, and it is difficult to tow the vehicle even with a trailer, it is preferred that Figure 1As shown, the parking brake mechanism 2 of the present invention also includes a mechanical release mechanism 4, which includes a release bolt 41 that is passed through the mounting flange 21. The release bolt 41 is located in the middle of the mounting flange 21. The release bolt 41 extends from the outside of the mounting flange 21 into the gearbox housing 1 and is passed through the middle of the piston guide sleeve 24. The end of the release bolt 41 that is located outside the mounting flange 21 is the outer end, and a release nut 42 is provided on the outer end. The end of the release bolt 41 that is located on the piston guide sleeve 24 is the inner end, and a fixing nut 43 is provided on the inner end. The mechanical release mechanism 4 is also provided with a pin (not shown in the figure) for fixing the release nut 42 to the release bolt 41. The outer end of the release bolt 41 and the release nut 42 are both provided with screw holes for inserting the pin.

[0039] During normal driving, the release nut 42 is threadedly connected to the outer end of the release bolt 41 and the two are fixed with a pin. At this time, there is a certain gap between the release nut 42 and the mounting flange 21. When the vehicle is parked, due to engine failure, the parking brake mechanism 2 locks the driving shaft 11, causing the wheel to be unable to rotate. Since the engine cannot be started, the hydraulic oil cannot be injected into the oil inlet channel 26 to release the parking brake mechanism 2. Therefore, the brake pad 22 on the driving shaft 11 is locked by the friction plate 23, causing the driving shaft 11 and the wheel to be unable to rotate. At this time, the locked state of the friction plate 23 and the brake pad 22 needs to be released by the mechanical release mechanism 4: when in use, Pull out the latch and tighten the release nut 42 toward the mounting flange 21 using a wrench or other tool so that the release nut 42 presses against the mounting flange 21. Then continue to tighten the release nut 42 toward the mounting flange 21. This will cause the release bolt 41 to move toward the outside of the mounting flange 21 along the thread of the release nut 42. When the release bolt 41 moves outward a certain distance, the piston guide sleeve 24 will move away from the friction plate 23, thereby reducing the friction between the friction plate 23 and the brake pad 22 until the friction plate 23 is separated from the brake pad 22, allowing the driving shaft 11 and the wheel to rotate, thereby achieving the effect of releasing the parking brake mechanism 2.

[0040] The transmission with a parking brake mechanism and an oil guide sleeve of the present invention is provided with a parking brake mechanism 2 at a position corresponding to the driving shaft 11 in the transmission housing 1, so that the vehicle can achieve the effect of automatic parking when it stops, effectively avoiding the situation where the vehicle rolls down a slope and causes an accident. In addition, the transmission housing 1 is provided with an oil guide sleeve 3 and an oil guide groove 31, which can effectively avoid the situation where the lubricating oil splashes and bubbles everywhere, resulting in oil failure, poor lubrication effect and increased oil temperature. The lubrication effect is better, and the lubricating oil is not easy to bubble, which can also prevent the oil temperature in the transmission from increasing.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission with a parking brake mechanism and an oil guide sleeve, comprising a transmission housing, a driving shaft rotatably disposed on an upper portion of the transmission housing, and a driven shaft rotatably disposed on a lower portion of the transmission housing, the driving shaft being in driving connection with the driven shaft, one end of the driving shaft being a fixed end connected to an output end of an engine, and the other end being a free end, characterized in that: A parking brake mechanism is further provided in the gearbox housing at a position corresponding to the free end, the parking brake mechanism comprising a mounting flange fixed to the gearbox housing, a brake pad sleeved on the free end, friction pads located on both sides of the brake pad, a piston guide sleeve provided corresponding to the friction pad, and a disc spring provided between the piston guide sleeve and the mounting flange, the piston guide sleeve being sealingly connected to the inner wall of the gearbox housing, a gap being provided between the friction pad and the brake pad, an oil filling space being provided between the piston guide sleeve and the gearbox housing, and an oil inlet channel being provided at a position of the gearbox housing corresponding to the oil filling space; The driving shaft is provided with a plurality of driving gears, the driven shaft is provided with a plurality of driven gears meshing with the driving gears, the lower part of the gearbox housing is provided with an oil guide sleeve corresponding to the position of the driven gears, the oil guide sleeve is fixed in the gearbox housing, the oil guide sleeve is provided with an oil guide groove corresponding to the position of each driven gear, and the lower part of each driven gear is located in the oil guide groove.

2. A gearbox with a parking brake mechanism and an oil guide sleeve according to claim 1, characterized in that: Two driven gears are provided on the driven shaft, and the two driven gears are arranged adjacent to each other. A sliding gear sleeve is provided between the two driven gears for shifting gears. Three oil guide grooves are correspondingly provided in the oil guide sleeve, and each of the oil guide grooves is adjacently spaced apart by partitions. The sliding gear sleeve and the lower parts of the two driven gears are respectively provided in the corresponding oil guide grooves.

3. A transmission with a parking brake mechanism and an oil guide sleeve according to claim 2, characterized in that: The bottom of each oil guide groove is provided with an oil inlet hole, and each oil inlet hole is located at the bottom of the corresponding oil guide groove.

4. The transmission with a parking brake mechanism and an oil guide sleeve according to claim 1, characterized in that: The free end is provided with an external spline at a position corresponding to the brake pad, and the brake pad is provided with an internal spline engaged with the external spline. The brake pad is fixed to the free end through the cooperation of the internal spline and the external spline.

5. The transmission with a parking brake mechanism and an oil guide sleeve according to claim 1, characterized in that: The parking brake mechanism also includes a mechanical release mechanism, which includes a release bolt inserted into the mounting flange. The release bolt extends from the outside of the mounting flange into the transmission housing and is inserted into the piston guide sleeve. The end of the release bolt located outside the mounting flange is the outer end, and a release nut is provided on the outer end. The end of the release bolt located on the piston guide sleeve is the inner end, and a fixing nut is provided on the inner end.

6. The transmission with a parking brake mechanism and an oil guide sleeve according to claim 5, characterized in that: The mechanical release mechanism is further provided with a latch for fixing the release nut and the release bolt, and screw holes for inserting the latch are provided on the outer end of the release bolt and the release nut.

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