Oil level measuring device and gearbox

Abstract

The utility model relates to the technical field of gearboxes, in particular to an oil level measuring device and a gearbox, the oil level measuring device comprises an oil dipstick tube connected with the bottom of the gearbox, and an oil dipstick is inserted in the oil dipstick tube; the oil dipstick is provided with an idling minimum oil level mark and a static maximum oil level mark. The oil level measuring device can be suitable for two typical working conditions of idling and static of the whole vehicle, the oil level safety interval is accurately divided, it is ensured that the lubricating oil amount of a gearbox is always within a reasonable range in different states, and faults caused by too high or too low oil amount are avoided. The oil level measuring device keeps the characteristics of low cost and high reliability of a traditional mechanical oil dipstick, is convenient to use, more intuitive in oil level judgment and low in misjudgment rate, has technical feasibility, economical efficiency and user friendliness, has wide application potential in the field of vehicle maintenance, and is suitable for popularization and application. The problem that in the prior art, oil level measurement cannot meet idling and static oil level measurement at the same time is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gearbox technical field, concretely is oil level measuring device and gearbox. BACKGROUND

[0002] With the gradual deepening of economic globalization situation, agricultural machinery market is also in the constant influx of engineering machinery gearbox, among them, in the power shift field, engineering machinery gearbox product occupies the main market, promotes the development of off -the -road tire crane, underground mine dump truck, wharf tractor, stacker and loader etc.

[0003] At present, for the vast majority of power shift gearbox, due to the need to output greater work torque, traditional pneumatic transmission has been unable to realize this requirement, since hydraulic transmission can provide greater power, realize higher transmission accuracy and be widely used in power shift gearbox field.But at the same time, in the process of using hydraulic transmission, also need to pay attention to many problems, for example, the sealing condition of each shell joint surface, oil seal and the reasonable use of O type ring, these all concern the end execution mechanism used hydraulic oil or pressure and whether the pressure is stable, one of the most important points is to determine that the gearbox is in a reasonable oil level state, excessive oil not only increases the internal transmission system's oil mixing loss, greatly reduces the work efficiency of gearbox, and for some oil seal, under static conditions, due to the failure to seal leads to oil leakage, in turn, leading to the increase of gearbox troubleshooting difficulty;On the contrary, the influence of insufficient oil is more serious, will lead to a large number of gears to lose oil heat after, working temperature rises sharply, gear gluing, pitting failure rate increases rapidly, bearing loses the protection of oil film, roller fragmentation, noise increase also can lead to the failure of gearbox, but the most serious is that each hydraulic control module loses oil pressure or pressure deficiency leads to a series of problems such as no response and slow response speed, therefore, for the hydraulic control gearbox, reasonable oil level is the basis of guaranteeing the stable operation of gearbox.

[0004] For oil level measurement, two cases are divided, namely static oil level and whole vehicle idle oil level; when the whole vehicle is in idle state, the oil in the gearbox is sucked by the oil pump and delivered to each pipeline and the end executing mechanism, at this time the oil level in the gearbox will certainly decrease, but the oil level at this time is the working oil level of the internal transmission gear, and the oil level at this time needs to be ensured to meet the lubrication and heat dissipation of the gear and bearing, therefore a minimum oil level, namely the whole vehicle idle oil level, is needed in the oil gauge; when the whole vehicle is in static parking state, the oil in each pipeline and the oil pump will fall back to the gearbox shell, at this time the oil level will be obviously higher than the working state oil level, but the oil level that is too high will lead to increased oil stirring heat loss at starting, therefore a maximum oil level, namely the static state oil level, is needed in the oil gauge. Therefore, a device that can meet the oil level measurement of the whole vehicle idle state and the whole vehicle static state is urgently needed to realize the accurate control of the whole vehicle oil level and ensure the stable operation of the gearbox and internal parts. Practical new type content

[0005] In view of the problem that the oil level measurement in the prior art cannot simultaneously meet the idle and static oil level measurement, the utility model provides an oil level measuring device and a gearbox.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme to realize it:

[0007] The utility model provides an oil level measuring device, including the oil gauge pipe connected with the bottom of gearbox, the oil gauge pipe is inserted with the oil gauge in the inside, be provided with idle minimum oil level sign and static maximum oil level sign on the oil gauge.

[0008] Optionally, the end of the oil gauge pipe connected with the gearbox is provided with an oil inlet connector, the oil inlet connector is provided with a shoulder, the oil inlet connector is inserted into the shell of the gearbox, so that the internal cavity of the gearbox is communicated with the oil gauge pipe, and the shoulder is fixedly connected with the shell of the gearbox.

[0009] Optionally, a first sealing ring is arranged between the oil inlet connector and the shell of the gearbox.

[0010] Optionally, a paper pad is arranged between the shoulder and the shell of the gearbox.

[0011] Optionally, the end of the oil gauge pipe away from the gearbox is provided with an oil gauge mounting head, the oil gauge mounting head is provided with an oil gauge mounting hole, and the oil gauge is mounted in the oil gauge mounting hole.

[0012] Optionally, a plurality of second sealing rings are arranged between the oil gauge and the inner wall of the oil gauge mounting hole.

[0013] Optionally, the oil gauge comprises an extension rod, one end of the extension rod is provided with a connecting cap, and the other end is provided with a measuring rod; the measuring rod is provided with an idling minimum oil level mark and a static maximum oil level mark.

[0014] Optionally, the measuring rod is provided with a plurality of mutually intersecting scale lines.

[0015] Optionally, the oil gauge tube is inclined to the rear end of the gearbox at an angle less than 90° to the horizontal.

[0016] A gearbox comprising the oil level measuring device described above.

[0017] Compared with the prior art, the oil level measuring device has the following beneficial effects:

[0018] The oil level measuring device comprises an oil gauge tube and an oil gauge, the oil gauge tube is connected to the bottom of the gearbox, the oil gauge is inserted into the oil gauge tube, and the oil gauge is provided with an idling minimum oil level mark and a static maximum oil level mark.

[0019] The end portion of the oil gauge tube connected to the gearbox is provided with an oil inlet connector, the oil inlet connector is provided with a shoulder, the oil inlet connector is inserted into the housing of the gearbox, so that the internal cavity of the gearbox is in communication with the oil gauge tube; the shoulder is fixedly connected to the housing of the gearbox, the oil inlet connector is inserted into the housing of the gearbox, the interface size precision is ensured through mechanical processing, the shoulder is axially limited, the leakage of oil from the connection is effectively prevented, the sealing property of the oil gauge tube and the internal cavity of the gearbox is ensured, the oil level of the whole vehicle under idling conditions is more suitable for measurement, the installation is convenient, the nondestructive disassembly and assembly are supported, and the modification cost is low.

[0020] The first sealing ring is arranged between the oil inlet connector and the housing of the gearbox, the sealing property of the gearbox is further improved, and the stable operation of the gearbox is ensured.

[0021] The paper pad is provided between the shoulder and the gearbox housing as a flexible filling material, can effectively compensate the micro unevenness of the contact surface between the shoulder and the gearbox housing, eliminate the micro gap when the metal directly contacts, and prevent the leakage of lubricating oil; in addition, the elasticity of the paper pad can absorb part of the deformation amount, maintain the stability of the sealing interface, and avoid the sudden increase of the sealing pressure caused by the expansion of the metal at high temperature or the expansion of the gap caused by the contraction at low temperature.

[0022] The oil gauge tube is provided with an oil gauge mounting head at the end away from the gearbox, the oil gauge mounting head is provided with an oil gauge mounting hole, and the oil gauge is mounted in the oil gauge mounting hole; the oil gauge mounting head can be precisely matched with the outer diameter of the oil gauge, ensures that the insertion of the oil gauge is not affected by the wall of the oil gauge tube, and at the same time avoids that the oil gauge occupies most of the space of the oil gauge tube, and reduces the influence of the oil gauge itself.

[0023] A plurality of second sealing rings are provided between the oil gauge and the inner wall of the oil gauge mounting hole, and a radial extrusion sealing is formed after the oil gauge is inserted, which prevents external dust and moisture from entering the oil gauge tube, and at the same time fixes the oil gauge through elastic deformation to avoid the oil gauge from being accidentally pulled out due to vehicle vibration or bumping, and ensures the stability during long-term use.

[0024] The oil gauge comprises an extension rod, one end of the extension rod is provided with a connecting cap, and the other end is provided with a measuring rod; the measuring rod is provided with an idling minimum oil level mark and a static maximum oil level mark; the end of the measuring rod is provided with a chamfer, which is easy to install the oil gauge, reduces the volume occupied by the oil gauge, and does not need to open a vent hole, avoiding oil leakage or oil pollution of the vent hole.

[0025] A plurality of intersecting scale lines are provided on the measuring rod, when the oil gauge is taken out of the oil gauge tube, the grooves with intersecting stripes will carry out trace amount of oil, which is convenient for the operator to observe and record the oil level.

[0026] The oil gauge tube and the horizontal direction form an angle less than 90°, and the oil gauge tube is inclined to the rear end of the gearbox, avoiding interference with the frame supporting the gearbox on the side, since the rear end of the gearbox has reached the final stage of transmission, the connection is generally an output shaft or an axle structure, compared with the torque converter and the engine in front of the gearbox, the operation space behind the gearbox is larger, and the oil level measurement is also relatively convenient and simple. In addition, since the entire oil gauge tube is inclined, the liquid surface inside the oil gauge tube is also inclined, compared with the straight oil gauge tube, the contact surface of the liquid surface and the oil gauge is larger, and the measured oil level is more accurate.

[0027] A gearbox comprising the oil level measuring device. Through accurate oil level control of the gearbox, reliability and user-oriented design of full working condition sealing, performance, cost and experience are broken through in multiple dimensions, and the pain points of traditional gearbox lubrication management are solved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a whole installation structure schematic view of the oil level measuring device.

[0029] Figure 2 It is a partial sectional view of the oil level measuring device.

[0030] Figure 3 It is an oil gauge pipe whole sectional structure view of the utility model.

[0031] Figure 4 It is an oil gauge pipe partial sectional structure view of the utility model.

[0032] Figure 5 It is an oil inlet connector sectional structure view of the utility model.

[0033] Figure 6 It is a paper pad structure view of the utility model.

[0034] Figure 7 It is an oil gauge mounting head sectional structure view of the utility model.

[0035] Figure 8 It is an oil gauge structure view of the utility model.

[0036] Figure 9 It is an oil gauge connecting cap structure view of the utility model.

[0037] Figure 10 It is a measuring rod structure view of the utility model.

[0038] Wherein, 1 - gearbox, 2 - oil gauge pipe, 3 - oil gauge, 21 - oil inlet connector, 22 - shoulder, 23 - paper pad, 24 - oil gauge mounting head, 25 - first sealing ring, 26 - bolt, 31 - second sealing ring, 32 - extension rod, 33 - connecting cap, 34 - measuring rod, 35 - minimum idle speed oil level mark, 36 - maximum static oil level mark, 37 - scale line, 38 - pull ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents the selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0041] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the embodiments of the application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, it is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element 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 application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0043] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0044] In the description of the embodiments of the application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0045] The application will be further described in detail below in conjunction with specific embodiments, which are an explanation of the application rather than a limitation.

[0046] Referring to Figure 1 and Figure 2 The application provides an oil level measuring device, which comprises an oil gauge pipe 2 and an oil gauge 3.

[0047] The oil gauge pipe 2 is connected with the bottom of the gearbox 1, and the oil gauge 3 is inserted into the oil gauge pipe 2; the oil gauge 3 is provided with an idle minimum oil level mark 35 and a static maximum oil level mark 36; MIN and MAX can be used to represent the idle minimum oil level mark 35 and the static maximum oil level mark 36 respectively, and the specific position requirement can be changed according to the required oil level of different gearboxes.

[0048] Preferably, the oil gauge pipe 2 is inclined to the rear end of the gearbox 1 at an angle less than 90° to the horizontal direction. In some other oil level measuring devices, the measuring structure is usually vertically upward. However, due to the limited space of the vehicle, sometimes it will interfere with the frame supporting the gearbox on the side, and the internal space becomes very narrow. The oil gauge pipe 2 is inclined to the rear of the gearbox 1. Since the rear of the gearbox 1 has reached the final stage of transmission, the connection is usually the output shaft or axle structure. Compared with the torque converter in front of the gearbox, the operation space behind the gearbox is larger, and the oil level measurement is relatively simple. In addition, since the entire oil gauge pipe 2 is inclined, the liquid level inside the oil gauge pipe 2 is also inclined. Compared with the vertical oil gauge pipe, the contact surface between the liquid level and the oil gauge 3 is larger, and the measured oil level is more accurate.

[0049] Referring to Figures 3 to 7 , the oil gauge pipe 2 comprises an oil inlet connector 21 and an oil gauge mounting head 24;

[0050] Referring to Figure 5 , the oil inlet connector 21 is arranged at one end of the oil gauge pipe 2 and is inserted into the housing of the gearbox 1, so that the internal cavity of the gearbox 1 is in communication with the oil gauge pipe 2. The oil inlet connector 21 is provided with a shoulder 22, and the shoulder 22 is fixedly connected with the housing of the gearbox 1 through a bolt 26. Preferably, in order to ensure the sealing of the entire structure, a first sealing ring 25 is arranged between the oil inlet connector 21 and the housing of the gearbox 1, and a paper gasket 23 is arranged between the shoulder 22 and the housing of the gearbox 1. When the bolt 26 is tightened, the paper gasket 23 is continuously compressed to fill the gap between the two contact surfaces or some microscopic features such as knife marks and scratches on the surface, thereby further achieving sealing.

[0051] Referring to Figure 7 , the oil gauge mounting head 24 is arranged at the other end of the oil gauge pipe 2, and the oil gauge mounting head 24 is provided with an oil gauge mounting hole. The oil gauge 3 is mounted in the oil gauge mounting hole.

[0052] Referring to Figures 8 to 10The oil gauge 3 comprises an extension rod 32, a connecting cap 33 and a measuring rod 34; the connecting cap 33 is arranged at one end of the extension rod 32, and the measuring rod 34 is arranged at the other end of the extension rod 32; the measuring rod 34 is provided with an idling minimum oil level mark 35 and a static maximum oil level mark 36; the connecting cap 33 is inserted into the oil gauge mounting hole, and a plurality of second sealing rings 31 are arranged between the connecting cap 33 and the inner wall of the oil gauge mounting hole; a pull ring 38 is arranged on the connecting cap 33 to facilitate pulling out the oil gauge 3.

[0053] For the sealing of the oil gauge and the oil gauge pipe, in some existing oil level measuring devices, an air vent is often added, so that during the installation of the oil gauge, air compression caused by complete internal sealing does not occur, and the phenomenon of "syringe" is not generated to push the liquid surface downward, and finally an incorrect conclusion that the measured oil level is lower than the actual oil level is drawn, but this can cause a serious problem, i.e., the oil can flow out of the air vent during driving due to the whole vehicle bumping, and the oil is thus polluted. In order to solve this problem, the utility model adopts a variable-diameter method to simultaneously solve the two problems; one of the problems is that the main reason for the decrease of the oil level in the oil gauge pipe caused by the insertion of the oil gauge is that the insertion of the oil gauge occupies the space of the internal air, therefore, preferably, the diameter of the oil gauge pipe 2 is much larger than the diameter of the oil gauge 1, the connecting cap 33 is arranged in cooperation with the oil gauge mounting hole to minimize the space occupied by the insertion of the oil gauge 1 in the oil gauge pipe 2, so as to improve the oil level measurement accuracy, in order to minimize the space occupied by the oil gauge 1, preferably, the measuring rod 34 is a hollow pipe with a chamfer, and the chamfer is arranged at the end of the oil gauge mounting hole to increase the size of the oil gauge mounting hole, so that the oil gauge 3 is more easily installed into the oil gauge pipe, thereby eliminating the feature of adding the air vent, which not only solves the influence of the insertion of the oil gauge 3 on the liquid surface, but also avoids the oil leakage and oil pollution caused by the air vent. In addition, in order to further enhance the sealing, double sealing is adopted between the oil gauge pipe 2 and the oil gauge 3, the design of the two sealing rings can completely eliminate the possibility of oil leakage, and also prolong the service life of the oil gauge 3, so that oil leakage caused by the failure of an O-shaped ring due to multiple measurements is avoided.

[0054] Preferably, a plurality of intersecting scale lines 37 are arranged on the measuring rod 34, when the oil gauge is taken out of the oil gauge pipe, the intersecting grooves with the scale lines can carry out a small amount of oil, so that the original oil level record is recorded on the oil gauge, and the operator can observe and record the oil level.

[0055] In use, the oil level measuring device is assembled to the gearbox 1, hydraulic oil is continuously added from the oil filling port of the gearbox 1, after the oil is added, the oil gauge 3 is pulled out from the oil gauge pipe 2, because the measuring rod of the oil gauge 3 has the cross scale line 37, a small amount of hydraulic oil is brought out, and the oil level is recorded in the scale line, whether the oil level is in the static state oil level scale line 37 is observed, if the oil level is lower than the required oil level, the oil needs to be continuously added from the oil filling port of the gearbox, until the oil level is in the static state oil level scale line 37 of the gearbox, if the oil level is higher than the required oil level, subsequent measurement can be continued.

[0056] The utility model provides a kind of gearbox, including above-mentioned oil level measuring device.It is realized that performance, cost and experience multidimensional breakthrough by accurate oil level control and the reliability and user-oriented design of full working condition sealing of gearbox, the pain point of traditional gearbox lubrication management is solved.

[0057] The above-mentioned is only the preferred embodiment of the utility model, and does not use to limit the technical scheme of the utility model in any way, and those skilled in the art should understand that, without departing from the spirit and principles of the utility model, the technical scheme can be modified and replaced in several simple ways, and these modifications and replacements also all belong to the protection scope covered in the claim book.

Claims

1. An oil level measuring device, characterized in that, The oil gauge tube (2) is connected with the bottom of the gearbox (1), and an oil gauge (3) is arranged in the oil gauge tube (2).

2. The oil level measuring device of claim 1, wherein The end of the oil gauge tube (2) connected with the gearbox (1) is provided with an oil inlet connector (21), the oil inlet connector (21) is provided with a shoulder (22), the oil inlet connector (21) is arranged on the shell of the gearbox (1), so that the internal cavity of the gearbox (1) is communicated with the oil gauge tube (2), and the shoulder (22) is fixedly connected with the shell of the gearbox (1).

3. The oil level measuring device of claim 2, wherein The oil inlet connector (21) and the shell of the gearbox (1) are provided with a first sealing ring (25).

4. The oil level measuring device of claim 2, wherein The shoulder (22) and the shell of the gearbox (1) are provided with a paper pad (23).

5. The oil level measuring device of claim 1, wherein The oil gauge tube (2) is provided with an oil gauge mounting head (24) away from the gearbox (1), the oil gauge mounting head (24) is provided with an oil gauge mounting hole, and the oil gauge (3) is mounted in the oil gauge mounting hole.

6. The oil level measuring device of claim 5, wherein The oil gauge (3) and the inner wall of the oil gauge mounting hole are provided with a plurality of second sealing rings (31).

7. The oil level measuring device of claim 1, wherein The oil gauge (3) comprises an extension rod (32), one end of the extension rod (32) is provided with a connecting cap (33), the other end is provided with a measuring rod (34), the measuring rod (34) is provided with an idle speed minimum oil level mark (35) and a static maximum oil level mark (36).

8. The oil level measuring device of claim 7, wherein The measuring rod (34) is provided with a plurality of mutually intersecting scale lines (37).

9. The oil level measuring device of claim 1, wherein, The oil gauge tube (2) is inclined to the rear end of the gearbox (1) and the included angle with the horizontal direction is less than 90°.

10. A gearbox characterized in that, The oil level measuring device comprises the oil level measuring device according to any one of claims 1-9. The oil level measuring device comprises the oil level measuring device according to any one of claims 1-9.

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