Cross shaft universal joint capable of preventing oil leakage

Abstract

The utility model discloses a cross shaft universal joint capable of preventing oil leakage, which relates to the technical field of universal joints and comprises a cross shaft, an oil injection nozzle is in threaded connection with an installation hole of the cross shaft, an O-shaped sealing ring is nested in the edge of the top of the installation hole, and the O-shaped sealing ring is sleeved on the lower surface of the top of an external thread of the oil injection nozzle. An inner threaded pipe is fixed on the outer side of the oil injection nozzle on the middle surface of the cross shaft, and a sealing assembly is in threaded connection in the inner threaded pipe; the sealing assembly comprises a protective cover and a sealing cap; the inner side surface of the top of the sealing cap is tightly attached to the oiling end face of the oiling nozzle. The universal joint has the advantages that through the counter-acting force of the sealing cap, the oil injection nozzle and the protective cover are not prone to thread loosening when the universal joint rotates at a high speed, the O-shaped sealing ring is prevented from restoring deformation, and the sealing effect on a thread gap of a mounting hole is improved; the phenomenon of oil throwing is effectively avoided, and the situation that the oil injection end of the oil injection nozzle is blocked by dust, and the later oil injection effect is affected is effectively avoided.

Description

Technical Field:

[0001] The utility model relates to the technical field of universal joints, and particularly to a cross shaft universal joint for preventing oil leakage. Background Art:

[0002] The cross shaft universal joint, also known as the cross shaft type universal joint, is a non-constant velocity universal joint composed of a cross shaft connecting two universal joint forks. The characteristic of this universal joint is that when connecting two shafts between different axes, it cannot maintain constant velocity transmission, so it is called a non-constant velocity universal joint. Although the cross shaft type universal joint cannot maintain constant velocity transmission, in vehicles or other mechanical equipment, it is an important transmission device used to connect the power transmitted by the engine and the power of the wheels or other working mechanisms, enabling them to rotate at different angles and directions, thereby improving the mechanical transmission efficiency and safety.

[0003] Existing cross shaft universal joints all have an oil injection nozzle, and the oil injection nozzle is fixed by threaded connection with the mounting hole of the cross shaft, making the oil injection end of the oil injection nozzle exposed on the outside. During the use of the universal joint, due to the high-speed rotation of the cross shaft, the internal lubricating oil is easily thrown out along the threaded gap of the mounting hole under the action of centrifugal force, resulting in the surface of the cross shaft being covered with lubricating oil, making dust adhere to the lubricating oil. Over time, the dust will block the oil injection end of the oil injection nozzle, affecting the later oil injection effect. Summary of the Utility Model:

[0004] The purpose of the utility model is to provide a cross shaft universal joint for preventing oil leakage to solve the problems raised in the above background art.

[0005] The utility model is implemented by the following technical solutions:

[0006] A cross shaft universal joint for preventing oil leakage includes a cross shaft. An oil injection nozzle is threadedly connected in the mounting hole of the cross shaft. An O-ring seal is nested inside the top edge of the mounting hole, and the O-ring seal is sleeved on the lower surface of the top of the external thread of the oil injection nozzle. A threaded tube with a "frustum" structure is fixed on the middle surface of the cross shaft outside the oil injection nozzle, and a sealing component is threadedly connected in the threaded tube; the sealing component includes a protective cover and a sealing cap; the protective cover is fixedly connected to the inner side of the threaded tube by threading, a card slot is opened in the middle of the top of the protective cover, and a sealing cap is fixed in the card slot. The inner surface of the top of the sealing cap is in close fit with the oil injection end face of the oil injection nozzle.

[0007] Preferably, push blocks are fixed on both sides of the top of the protective cover.

[0008] Preferably, the sealing cap is made of rubber material.

[0009] Advantages of the present utility model: Due to the reaction force of the sealing cap, the oil injection nozzle and the protective cover are not likely to have thread loosening during the high-speed rotation of the cross shaft, avoiding the restoration of the deformation of the O-ring seal, and improving the sealing effect on the thread gap of the mounting hole; effectively avoiding the occurrence of oil splashing and the blocking of the oil injection end of the oil injection nozzle by dust, which affects the later oil injection effect. Brief Description of the Drawings:

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is Figure 1 partial structural diagram of;

[0012] Figure 3 is a schematic structural diagram of the sealing assembly;

[0013] Figure 4 is Figure 3 cross-sectional view of;

[0014] Figure 5 is a reference diagram for the use of the sealing assembly.

[0015] In the figure: 1, cross shaft, 1.1, mounting hole, 1.2, O-ring seal, 2, oil injection nozzle, 3, internal thread tube, 4, sealing assembly, 4.1, protective cover, 4.11, card slot, 4.12, push block, 4.2, sealing cap. Specific Embodiments:

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0017] Please refer to Figures 1-5 , the present utility model provides a technical solution for a cross shaft universal joint to prevent oil leakage:

[0018] A cross universal joint for preventing oil leakage, comprising a cross shaft 1. A grease nipple 2 is connected to the inner thread of the mounting hole 1.1 of the cross shaft 1. An O-ring 1.2 is nested inside the top edge of the mounting hole 1.1. The O-ring 1.2 is sleeved on the lower surface of the top of the external thread of the grease nipple 2. A grease nipple 2 is connected to the middle part of the cross shaft 1 by thread. An internal thread pipe 3 with a "frustum" structure is fixed on the middle surface of the cross shaft 1 outside the grease nipple 2. A sealing component 4 is connected to the internal thread of the internal thread pipe 3 for dust prevention and sealing. The sealing component 4 includes a protective cover 4.1 and a sealing cap 4.2. The protective cover 4.1 is fixedly connected to the inner side of the internal thread pipe 3 by thread. On both sides of the top of the protective cover 4.1, push blocks 4.12 are fixed to facilitate the screwing and removal of the protective cover 4.1.

[0019] A card slot 4.11 is opened in the middle of the top of the protective cover 4.1, and a sealing cap 4.2 is fixed in the card slot 4.11. The sealing cap 4.2 is made of rubber material. The inner surface of the top of the sealing cap 4.2 is in close contact with the oil injection end face of the grease nipple 2.

[0020] The working principle is as follows: The O-ring 1.2 is sleeved on the lower surface of the top of the external thread of the grease nipple 2. Then, the grease nipple 2 is connected to the mounting hole 1.1 by thread. After tightening, the O-ring 1.2 is deformed by extrusion between the grease nipple 2 and the cross shaft 1. The deformed O-ring 1.2 can block the threaded gap of the mounting hole, so that when the cross shaft rotates at high speed, the lubricating oil is not easily thrown out. Then, the protective cover 4.1 is connected to the internal thread pipe 3 by thread. When tightening, due to certain elasticity and friction of the sealing cap 4.2, and the sealing cap 4.2 does not wear the oil injection end of the grease nipple 2, the oil injection end of the top of the grease nipple 2 presses against the sealing cap 4.2 and extends a certain distance out of the card slot, so that the grease nipple 2 and the protective cover 4.1 are not easily loosened by thread when the cross shaft rotates at high speed under the reaction force of the sealing cap 4.2, avoiding the restoration of the deformation of the O-ring 1.2 and further improving the sealing effect on the threaded gap of the mounting hole.

[0021] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cross-axis universal joint for preventing oil leakage, comprising a cross-axis (1), wherein a mounting hole (1.1) of the cross-axis (1) is internally threadedly connected with an oiling nozzle (2), characterized in that: An O-type sealing ring (1.2) is embedded in the top edge of the mounting hole (1.1), and the O-type sealing ring (1.2) is sleeved on the top lower surface of the external thread of the oiling nozzle (2). The middle surface of the cross shaft (1) is located outside the oiling nozzle (2), and an internally threaded tube (3) with a "truncated cone" structure is fixed thereto, and the internal thread of the internally threaded tube (3) is connected to a sealing component (4); the sealing component (4) comprises a protective cover (4.1) and a sealing cap (4.2); the protective cover (4.1) is connected and fixed to the inner side thread of the internally threaded tube (3), a slot (4.11) is provided in the middle of the top of the protective cover (4.1), and a sealing cap (4.2) is fixed in the slot (4.11), and the inner side surface of the top of the sealing cap (4.2) is tightly fitted with the oiling end surface of the oiling nozzle (2).

2. The cross-axis universal joint for preventing oil leakage according to claim 1, characterized in that: Push blocks (4.12) are fixed on both sides of the top of the protective cover (4.1).

3. The cross-axis universal joint for preventing oil leakage according to claim 1, characterized in that: The sealing cap (4.2) is made of rubber material.

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