Ventilation structure of forklift gearbox, forklift gearbox and forklift

Abstract

The utility model discloses a forklift gearbox ventilation structure, a forklift gearbox and a forklift. The forklift gearbox ventilation structure comprises a ventilation plug and an air outlet pipe. In the vertical direction, the vent plug is installed at the upper end of the air outlet pipe, the lower end of the air outlet pipe is communicated with an air hole in the gearbox, and the air outlet pipe is fixed to a front baffle of the frame. The height difference between the vent plug and the vent hole meets the condition that the pressure intensity of the oil column with the height difference is larger than the gas pressure intensity at the vent hole when the gearbox normally operates. The air outlet pipe is arranged to be communicated with the vent hole in the gearbox and the vent plug, and the pressure intensity of the oil column in the air outlet pipe is utilized to overcome the gas pressure intensity at the vent hole, so that the oil automatically flows back into the gearbox, normal discharge of high-temperature and high-pressure gas can be guaranteed, the oil in the gearbox can be prevented from being brought out, and the service life of the gearbox is prolonged. Therefore, the loss of oil is reduced, the maintenance cost is reduced, and in addition, the situation that the working environment is polluted by the brought-out oil is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift transmission systems, and in particular to a breather structure for a forklift gearbox, a forklift gearbox and a forklift. Background Art

[0002] A forklift is a multi-purpose lifting and handling device, which combines stability and high efficiency and is suitable for various material handling environments. The gearbox of its transmission system plays a crucial role during operation.

[0003] In the prior art, during the normal operation of a forklift, the temperature inside the forklift gearbox will gradually rise, and the gas inside will gradually heat up and expand. In order to prevent the seals inside the gearbox from being damaged due to excessive pressure, breather holes are provided on the existing forklift gearboxes, and breather devices are provided on the breather holes to discharge the high-temperature and high-pressure gas inside the gearbox and reduce the pressure inside the gearbox.

[0004] When the high-temperature and high-pressure gas inside the forklift gearbox is discharged through the breather device, the oil inside the gearbox is often carried out together, which exacerbates the loss of the oil, increases the maintenance cost of the forklift, and at the same time, the carried-out oil will pollute the working environment.

[0005] Therefore, the breather devices of existing forklifts urgently need to be optimized and improved. Summary of the Invention

[0006] In view of this, the utility model provides a breather structure for a forklift gearbox, which can discharge the high-temperature and high-pressure gas inside the gearbox normally while preventing the oil inside the gearbox from being carried out by the high-temperature and high-pressure gas.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A breather structure for a forklift gearbox, comprising:

[0009] A breather plug and an outlet pipe;

[0010] In the up and down direction, the breather plug is installed at the upper end of the outlet pipe, the lower end of the outlet pipe is communicated with the breather hole on the gearbox, and the outlet pipe is fixed on the front baffle of the vehicle frame; the height difference between the height of the breather plug and the height of the breather hole satisfies that the pressure of the oil column of this height difference is greater than the gas pressure at the breather hole during the normal operation of the gearbox.

[0011] Preferably, the lower part of the outlet pipe has a first bending section and a second bending section, the first bending section is fixed on the front baffle of the vehicle frame through a hose clamp, and both the first bending section and the second bending section are used to increase the upward resistance of the oil.

[0012] Preferably, the bending directions of the first bending section and the second bending section are opposite.

[0013] Preferably, the forklift transmission breather structure further includes a mounting seat which has a mounting joint and a connecting pipe. The connecting pipe is located at the lower end of the mounting joint. The breather plug is detachably connected to the mounting joint. The connecting pipe is inserted into the upper end of the air outlet pipe and fastened with a hose clamp.

[0014] Preferably, the forklift transmission breather structure further includes a fixing bracket. One end of the fixing bracket is fixedly connected to the connecting pipe, and the other end is fixedly connected to the front baffle of the vehicle frame. The lower part of the air outlet pipe is fixedly connected to the front baffle of the vehicle frame with a hose clamp.

[0015] Preferably, the forklift transmission breather structure further includes an adapter joint which has an inlet end and an outlet end. The inlet end is communicated with the breather hole and fastened with a nut. The outlet end is communicated with the lower end of the air outlet pipe and fastened with a hose clamp.

[0016] A forklift transmission includes the forklift transmission breather structure according to any one of the above.

[0017] A forklift includes the forklift transmission described above.

[0018] Compared with the prior art, for a forklift transmission breather structure disclosed in the present application, by providing an air outlet pipe to communicate the breather hole on the transmission with the breather plug, and using the pressure of the oil column in the air outlet pipe itself to overcome the gas pressure at the breather hole, so as to realize the self-return of the oil to the transmission. In this way, not only can the normal discharge of high-temperature and high-pressure gas be ensured, but also the oil in the transmission can be prevented from being carried out, thereby reducing the oil loss and the maintenance cost. In addition, it effectively avoids the situation that the working environment is polluted by the carried-out oil.

[0019] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an assembly drawing of the forklift transmission breather structure disclosed in the embodiment of the present application;

[0021] Figure 2 is an assembly drawing at the adapter joint of the forklift transmission breather structure disclosed in the embodiment of the present application;

[0022] Figure 3 is a schematic structural diagram of the upper end of the air outlet pipe of the forklift transmission breather structure disclosed in the embodiment of the present application.

[0023] Reference numerals:

[0024] 1. Vent plug;

[0025] 2. Exhaust pipe; 21. First bent section; 22. Second bent section;

[0026] 3. Mounting base; 31. Mounting joint; 32. Connecting pipe;

[0027] 4. Vent plug; 5. Fixed bracket; 6. Adapter joint; 7. Front fender of forklift truck frame; 8. Forklift transmission; 9. Forklift truck. Detailed implementation manners

[0028] The utility model discloses a ventilation structure for a forklift transmission, which can enable the high-temperature and high-pressure gas in the transmission to be discharged normally while preventing the oil in the transmission from being carried out by the high-temperature and high-pressure gas.

[0029] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0031] Next, refer to Figures 1 to 3 Describe the ventilation structure of the forklift transmission in the embodiments of the present utility model.

[0032] As Figure 1 shown, a ventilation structure for a forklift transmission is disclosed in the embodiments of the present application, including: a vent plug 41 and an exhaust pipe 2.

[0033] Among them, in the up and down direction, the vent plug 41 is installed at the upper end of the exhaust pipe 2, the lower end of the exhaust pipe 2 is communicated with the vent hole on the transmission, and the exhaust pipe 2 is fixed on the front fender 7 of the forklift truck frame; the height difference between the height of the vent plug 41 and the height of the vent hole satisfies that the pressure of the oil column of this height difference is greater than the gas pressure at the vent hole during the normal operation of the transmission.

[0034] During the normal operation of the forklift truck 9, the high-temperature and high-pressure gas in the transmission needs to first pass through the exhaust pipe 2 and then pass through the vent plug 41 located at the upper end of the exhaust pipe 2 to be discharged.

[0035] When the high-temperature and high-pressure gas in the gearbox passes through the air outlet pipe 2, the oil in the gearbox will still be carried into the air outlet pipe 2. However, due to the height difference between the breather hole on the gearbox and the breather plug 41, as the oil in the air outlet pipe 2 gradually climbs, the pressure of the oil in the air outlet pipe 2 gradually increases. Therefore, when the pressure of the oil in the air outlet pipe 2 is greater than the gas pressure at the breather hole, the oil will flow back into the gearbox, thus preventing the oil from being carried out of the gearbox by the high-temperature and high-pressure gas, effectively reducing the loss of oil, and reducing the later maintenance cost of the forklift 9.

[0036] In some embodiments, the lower part of the air outlet pipe 2 has a first bending section 21 and a second bending section 22. The first bending section 21 is fixed to the front baffle 7 of the frame by a hose clamp. Both the first bending section 21 and the second bending section 22 are used to increase the upward resistance of the oil.

[0037] The settings of the first bending section 21 and the second bending section 22 can effectively increase the upward resistance of the oil on the premise of ensuring the normal passage of the high-temperature and high-pressure gas in the gearbox. In this way, it can further prevent the oil in the gearbox from being carried out, thereby reducing the risk of the oil being carried out.

[0038] In this embodiment, the bending directions of the first bending section 21 and the second bending section 22 are opposite.

[0039] For example Figure 2 As shown, the first bending section 21 bends towards the side away from the front baffle 7 of the frame, and the second bending section 22 bends towards the side of the front baffle 7 of the frame. In this way, the oil wrapped by the high-temperature and high-pressure gas needs to pass through two sections with completely opposite bending directions in succession before it can continue to climb upward along the air outlet pipe 2, significantly increasing the difficulty of carrying out the oil and effectively reducing the oil loss in the gearbox.

[0040] In some embodiments, the forklift gearbox breather structure further includes a mounting seat 3. The mounting seat 3 has a mounting joint 31 and a connecting pipe 32. The connecting pipe 32 is located at the lower end of the mounting joint 31. The breather plug 41 is detachably connected to the mounting joint 31. The connecting pipe 32 is inserted into the upper end of the air outlet pipe 2 and fastened with a hose clamp. By providing the mounting seat 3, it is convenient to disassemble and assemble the breather plug 41 for later maintenance and replacement of the breather plug 41.

[0041] In this embodiment, for example Figure 1 and Figure 3 As shown, the forklift gearbox breather structure further includes a fixing bracket 5. One end of the fixing bracket 5 is fixedly connected to the connecting pipe 32, and the other end is fixedly connected to the front baffle 7 of the frame; the lower part of the air outlet pipe 2 is fixedly connected to the front baffle 7 of the frame by a hose clamp. The fixing bracket 5 and the hose clamp respectively fix the upper and lower parts of the air outlet pipe 2, which can effectively ensure the installation stability of the air outlet pipe 2 and prevent the air outlet pipe 2 from falling off.

[0042] In some embodiments, for example Figure 2 As shown, the breather structure of the forklift transmission further includes an adapter joint 6. The adapter joint 6 has an inlet end and an outlet end. The inlet end is communicated with the breather hole and fastened with a nut. The outlet end is communicated with the lower end of the air outlet pipe 2 and fastened with a hose clamp. The setting of the adapter joint 6 can facilitate the installation of the air outlet pipe 2.

[0043] This application also discloses a forklift transmission 8, including the breather structure of the forklift transmission disclosed in the above embodiments. Therefore, the forklift transmission 8 with this breather structure of the forklift transmission has all the above technical effects, which will not be elaborated herein one by one.

[0044] This application also discloses a forklift 9, including the forklift transmission 8 disclosed in the above embodiments. Therefore, the forklift 9 with this forklift transmission 8 has all the above technical effects, which will not be elaborated herein one by one.

[0045] For those of ordinary skill in the art, the other components and operations of the breather structure of the forklift transmission, the forklift transmission 8 and the forklift 9 according to the embodiments of the present utility model are known, and will not be described in detail here.

[0046] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0047] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A forklift gearbox ventilation structure, characterized in that: include: A vent plug and an air outlet pipe, wherein in the up-down direction, the vent plug is mounted on the upper end of the air outlet pipe, the lower end of the air outlet pipe is connected to the vent hole on the gearbox, and the air outlet pipe is fixed on the front baffle of the vehicle frame; The height difference between the vent plug and the vent hole satisfies: The pressure of the oil column with this height difference is greater than the gas pressure at the air vent when the gearbox is operating normally.

2. The forklift gearbox ventilation structure according to claim 1, characterized in that: The lower part of the air outlet pipe has a first bending section and a second bending section. The first bending section is fixed to the front baffle of the frame through a throat clamp. The first bending section and the second bending section are both used to increase the upward resistance of the oil.

3. The forklift gearbox ventilation structure according to claim 2, characterized in that: The first bending section and the second bending section have opposite bending directions.

4. The forklift gearbox ventilation structure according to claim 1, characterized in that: It also includes a mounting seat, which has a mounting joint and a connecting pipe. The connecting pipe is located at the lower end of the mounting joint. The air permeable plug is detachably connected to the mounting joint. The connecting pipe is inserted into the upper end of the air outlet pipe and is fastened with a throat clamp.

5. The forklift gearbox ventilation structure according to claim 4, characterized in that: It also includes a fixing bracket, one end of which is fixedly connected to the pipe, and the other end of which is fixedly connected to the front baffle of the frame; The lower part of the air outlet pipe is fixedly connected to the front baffle of the vehicle frame by using a throat clamp.

6. The forklift gearbox ventilation structure according to claim 1, characterized in that: It also includes an adapter joint, which has an inlet end and an outlet end. The inlet end is connected to the air vent and is fastened with a nut, and the outlet end is connected to the lower end of the air outlet pipe and is fastened with a throat clamp.

7. A forklift gearbox, characterized in that: A forklift gearbox ventilation structure comprising any one of claims 1-6.

8. A forklift, characterized in that: The invention comprises the forklift gearbox as claimed in claim 7.

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