Combined oil pipe joint of mining transmission and mining transmission

Abstract

The utility model relates to an oil pipe connecting piece, in particular to a combined oil pipe connector of a mining transmission and the mining transmission, and aims to solve the problems that a bottom oil supply pipeline connector of an existing forced lubrication system is multiple in assembly, poor in sealing effect and poor in installation distance control. The combined oil pipe joint comprises a combined oil pipe joint consisting of an external connecting section, an external mounting section, an internal mounting section and an internal connecting section which are integrally connected, a clamping sleeve and a nut for a clamping sleeve type pipe joint, the external connecting section and the ferrule type pipe joint are connected by a nut through a straight thread, and are sealed by a ferrule; the internal installation section and the transmission rear shell are connected through straight threads, the internal connection section and the transmission bottom oil supply pipe connector are connected through straight threads, and therefore the structure is simplified, the oil leakage failure rate is reduced, and tolerance control over rear-end parts is facilitated.

Description

Technical Field

[0001] This utility model relates to an oil pipe connector, specifically to a combination oil pipe joint for a mining gearbox and a mining gearbox. Background Technology

[0002] Wide-body off-road dump trucks, as specialized engineering machinery for transporting earth, rock, and minerals, are widely used in open-pit mining operations. Due to the harsh operating conditions, mining truck transmissions are equipped with forced lubrication systems. A commonly used existing forced lubrication system has a bottom oil supply pipeline structure as follows: Figure 1 As shown, the external oil supply pipe 1 of the transmission is connected to the bottom oil supply pipe connector 6 of the transmission using a sequentially threaded ferrule-type pipe fitting nut 3, a ferrule-type tapered thread straight connector 4, and an oil filter plug 5. The ferrule-type pipe fitting nut 3 contains a ferrule 2, and the oil filter plug 5 is connected to the rear housing 7 of the transmission using an NPT thread seal. This connection method has problems such as numerous components and poor sealing effect. Furthermore, because the NPT thread is a special tapered thread, its tightening degree is determined by torque, resulting in significant differences in the distance of the threaded mating sections. This leads to varying lengths of the oil filter plug 5 protruding from the rear housing 7 of the transmission, making the installation distance difficult to control. These problems, under harsh working conditions in mining areas and with improper driver operation, can easily lead to an increased failure rate of mining transmissions.

[0003] Chinese patent CN220228169U discloses a hollow oil pipe connector with anti-loosening and sealing functions. It includes a threaded connection end that is threaded to the internal thread of the automobile oil circuit, a sealing connection end located below the threaded connection end, and a hexagonal wrench that connects the threaded connection end and the sealing connection end together. This connector has both anti-loosening and sealing functions, which can prevent the connection from loosening and oil leakage caused by external environmental vibration. However, the structure of this connector is only suitable for oil circuit connections in general vehicles. It is not applicable to the forced lubrication system of the transmission of mining trucks that operates under harsh conditions. Utility Model Content

[0004] The main purpose of this utility model is to solve the problems of existing forced lubrication systems with numerous components, poor sealing effect, difficulty in controlling the installation distance, and high failure rate of mining gearboxes, and to provide a combination oil pipe joint for mining gearboxes and a mining gearbox.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A mining gearbox combination oil pipe joint, characterized by the following features:

[0007] Includes combined oil pipe fittings with oil passage holes along the axial direction, ferrules, and nuts for ferrule-type pipe fittings;

[0008] The combined oil pipe joint comprises an outer connecting section, an outer mounting section, an inner mounting section and an inner connecting section connected in sequence;

[0009] The outer side wall of the outer connecting section is provided with external threads, the sleeve-type pipe joint nut is internally provided with a sleeve, the outer connecting section is threadedly connected with the sleeve-type pipe joint nut and compresses the sleeve, the sleeve-type pipe joint nut is arranged on the oil delivery pipe outside the transmission, and the sleeve is arranged between the sleeve-type pipe joint nut and the oil delivery pipe outside the transmission.

[0010] The outer diameter of the outer mounting section is greater than that of the outer connecting section, and the outer mounting section is externally provided with a clamping structure for mounting by using a tool.

[0011] The outer diameter of the inner mounting section is matched with the size of the mounting hole of the rear shell of the transmission, and the outer side wall of the inner mounting section is provided with external threads for threadedly connecting with the rear shell of the transmission.

[0012] The outer diameter of the inner connecting section is matched with the inner diameter of the oil delivery pipe joint at the bottom of the transmission, and the outer side wall of the inner connecting section is provided with external threads for threadedly connecting with the oil delivery pipe joint at the bottom of the transmission.

[0013] Further, an annular boss is arranged between the outer mounting section and the inner mounting section, and the outer diameter of the annular boss is greater than the diameter of the mounting hole on the rear shell of the transmission, so as to axially limit the combined oil pipe joint.

[0014] Further, a ring-shaped sealing groove is arranged at the connection between the annular boss and the inner mounting section, and an O-shaped sealing ring is arranged in the ring-shaped sealing groove, so as to ensure the connection sealing between the combined oil pipe joint and the rear shell of the transmission.

[0015] Further, the external threads arranged on the outer walls of the outer connecting section, the inner mounting section and the inner connecting section are straight threads, so as to ensure that the lengths of the combined oil pipe joint exposed from the rear shell of the transmission are the same.

[0016] Further, the clamping structure arranged on the outer side wall of the outer mounting section is a regular hexagonal structure, so as to be fastened and mounted by using a universal sleeve or a hexagonal wrench.

[0017] In addition, the utility model also provides a mine transmission, including transmission bottom oil delivery pipe and mounting hole inner wall processing has straight thread's transmission rear shell, its special place lies in: still include above-mentioned a mine transmission combined oil pipe joint, transmission bottom oil delivery pipe is connected with inner connecting section through transmission bottom oil delivery pipe joint, transmission rear shell is connected with inner mounting section.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. The mining transmission combined oil pipe joint provided by the utility model adopts an integrated structure, can reduce the number of components at the connection of the oil circuit system, thereby reducing the oil leakage risk points, reducing the transmission oil leakage failure rate, and improving the production efficiency of the transmission.

[0020] 2. The mining transmission combined oil pipe joint provided by the utility model uses straight threads instead of the original NPT threads at the connection between the joint and the transmission rear shell, thereby avoiding the problem that the original joint causes the installation distance to be not fixed due to the use of NPT threads, and the length of the combined oil pipe joint exposed from the transmission rear shell after installation is inconsistent, which is beneficial to tolerance control and standardized assembly of the rear end components of the transmission.

[0021] 3. The mining transmission combined oil pipe joint provided by the utility model uses an O-shaped sealing ring for further sealing at the connection with the transmission rear shell, and the structure is more reliable than the original NPT thread sealing, thereby further reducing the transmission oil leakage failure rate at this position. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the bottom oil supply pipeline of the existing forced lubrication system.

[0023] Figure 2 It is an installation position schematic view of the mining transmission combined oil pipe joint embodiment of the utility model in the bottom oil supply pipeline of the forced lubrication system.

[0024] Figure 3 It is a three-dimensional structure schematic of the combined oil pipe joint in the mining transmission combined oil pipe joint embodiment of the utility model Figure 1 .

[0025] Figure 4 It is a three-dimensional structure schematic of the combined oil pipe joint in the mining transmission combined oil pipe joint embodiment of the utility model Figure 2 .

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1 - transmission external oil supply pipe; 2 - sleeve; 3 - sleeve type pipe joint nut; 4 - sleeve type taper thread straight-through joint body; 5 - oil filter plug; 6 - transmission bottom oil supply pipe joint; 7 - transmission rear shell; 8 - combined oil pipe joint; 81 - external connection section; 82 - external installation section; 83 - internal connection section; 84 - internal installation section; 85 - sealing groove; 9 - O-shaped sealing ring. DETAILED DESCRIPTION

[0028] The utility model will be further described in combination with the drawings and specific embodiments.

[0029] A mining transmission combined oil pipe joint, which has the structure asFigure 3 As shown; it includes a combined oil pipe joint 8 with an axially extending oil passage hole, a ferrule 2, and a nut 3 for the ferrule-type pipe joint; the specific structure of the combined oil pipe joint 8 is as follows Figure 4 , ​ As shown, it includes an external connection segment 81, an external mounting segment 82, an internal mounting segment 84, and an internal connection segment 83 that are connected together in sequence;

[0030] The outer diameter of the external connecting section 81 is adapted to the inner diameter of the nut 3 for the compression fitting, and the inner diameter is adapted to the outer diameter of the external oil supply pipe 1 of the transmission. The outer wall of the external connecting section 81 is provided with external threads. A ferrule 2 is installed inside the nut 3 for the compression fitting. The external connecting section 81 is threadedly connected to the nut 3 for the compression fitting and the ferrule 2 is pressed tightly. The nut 3 for the compression fitting is installed on the external oil supply pipe 1 of the transmission, and the ferrule 2 is positioned between the nut 3 for the compression fitting and the external oil supply pipe 1 of the transmission.

[0031] The external mounting section 82 is provided with a regular hexagonal clamping structure, the outer diameter of which is larger than that of the external connecting section 81 and the internal mounting section 84; during the installation process, the operator can use a general socket or hex wrench to tighten the installation.

[0032] The outer diameter of the internal mounting section 84 is adapted to the size of the mounting hole in the rear housing 7 of the transmission. The outer side wall of the internal mounting section 84 is provided with external threads for threaded connection with the rear housing 7 of the transmission.

[0033] The outer diameter of the internal connecting section 83 is adapted to the inner diameter of the oil supply pipe joint 6 at the bottom of the transmission. The outer side wall of the internal connecting section 83 is provided with external threads for threaded connection with the oil supply pipe joint 6 at the bottom of the transmission.

[0034] In addition, an annular boss is provided between the external mounting section 82 and the internal mounting section 84, and the outer diameter of the annular boss is larger than the diameter of the mounting hole on the rear housing 7 of the transmission, so as to axially limit the combined oil pipe joint 8; an annular sealing groove 85 is provided at the connection between the annular boss and the internal mounting section 84, and an O-ring seal 9 is installed in the annular sealing groove 85 to ensure the connection seal between the combined oil pipe joint 8 and the rear housing 7 of the transmission.

[0035] The external connecting section 81, external mounting section 82, internal mounting section 84, and internal connecting section 83 are integrated into one unit, and all the threads on them are straight threads. Compared with the original multi-part NPT threaded connection, this improves the reliability of the sealed installation and ensures that the length of the part of the combined oil pipe joint 8 exposed in the rear housing 7 of the transmission is the same, which is conducive to the standardized assembly of subsequent parts. The internal mounting section 84 and the rear housing 7 of the transmission are further sealed by an O-ring seal 9, which ensures the sealing performance between the combined oil pipe joint 8 and the rear housing 7 of the transmission.

[0036] In addition, the embodiment further provides a mine transmission, which comprises a transmission bottom oil supply pipe and a transmission rear shell 7 with straight threads on the inner wall of the mounting hole.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. For ordinary professional technicians in the art, the specific technical solutions described in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. These modifications or replacements do not change the essence of the corresponding technical solutions from the scope of the technical solutions protected by the present application.

Claims

1.A mine transmission combined oil pipe joint, characterized in that: it comprises a combined oil pipe joint (8) with an oil passage hole opened in the axial direction, a sleeve (2) and a sleeve pipe joint nut (3); the combined oil pipe joint (8) comprises an external connecting section (81), an external mounting section (82), an internal mounting section (84) and an internal connecting section (83) connected together in sequence; an external thread is arranged on the outer side wall of the external connecting section (81), the internal mounting section (84) and the internal connecting section (83), the sleeve pipe joint nut (3) is internally provided with the sleeve (2), the external connecting section (81) is threadedly connected with the sleeve pipe joint nut (3) and compresses the sleeve (2), the sleeve pipe joint nut (3) is arranged on the transmission external oil supply pipe (1), and the sleeve (2) is arranged between the sleeve pipe joint nut (3) and the transmission external oil supply pipe (1); the external mounting section (82) has an outer diameter larger than that of the external connecting section (81) and is externally provided with a clamping structure for installation by using a tool; the internal mounting section (84) has an outer diameter matched with the size of the mounting hole of the transmission rear shell (7) and is provided with an external thread on the outer side wall for threadedly connecting with the transmission rear shell (7); the internal connecting section (83) has an outer diameter matched with the inner diameter of the transmission bottom oil supply pipe joint (6), and the outer side wall of the internal connecting section (83) is provided with an external thread for threadedly connecting with the transmission bottom oil supply pipe joint (6). 2.The mine transmission combined oil pipe joint according to claim 1, characterized in that: an annular boss is arranged between the external mounting section (82) and the internal mounting section (84), and the outer diameter of the annular boss is larger than the diameter of the mounting hole on the transmission rear shell (7) to axially limit the combined oil pipe joint (8). 3.The mine transmission combined oil pipe joint according to claim 2, characterized in that: an annular sealing groove (85) is arranged at the connection between the annular boss and the internal mounting section (84), and an O-shaped sealing ring (9) is arranged in the annular sealing groove (85) to ensure the sealing connection between the combined oil pipe joint (8) and the transmission rear shell (7). 4.The mine transmission combined oil pipe joint according to claim 1, characterized in that: the external threads arranged on the outer walls of the external connecting section (81), the internal mounting section (84) and the internal connecting section (83) are straight threads. 5.The mine transmission combined oil pipe joint according to claim 1, characterized in that: the clamping structure arranged on the external mounting section (82) is a regular hexagonal structure, so that a general sleeve or a hexagonal wrench is used for fastening installation. 6.A mine transmission comprising a transmission bottom oil supply pipe and a transmission rear shell (7) with a straight thread processed on the inner wall of a mounting hole, characterized in that: it further comprises the mine transmission combined oil pipe joint according to any one of claims 1-5, the transmission bottom oil supply pipe is threadedly connected with the internal connecting section (83) through the transmission bottom oil supply pipe joint (6), and the transmission rear shell (7) is threadedly connected with the internal mounting section (84).

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