Oil discharge hole sealing structure of recirculating ball steering gear

Abstract

The utility model belongs to the field of automobile parts, and particularly relates to a sealing structure for an oil discharge hole of a recirculating ball steering gear. The oil drainage bolt comprises an oil drainage hole and an oil drainage bolt which are arranged on the recirculating ball steering gear, the oil drainage hole of the recirculating ball steering gear is connected with a cavity of the recirculating ball steering gear, the oil drainage bolt is connected with the oil drainage hole of the recirculating ball steering gear in a matched mode through taper threads, and the taper thread parameters of the oil drainage bolt plug are that the thread angle is 60 degrees, the thread pitch P is 1.5 mm, the thread crest width is 0.1 P, and the thread bottom arc transition radius R is 0.15 P. And a double-sealing mechanism that a straight thread bolt is replaced by a thread bolt and sealant is coated in the bolt and the oil discharge hole achieves an efficient sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts, specifically relating to a sealing structure for the oil drain hole of a recirculating ball steering gear. Background Technology

[0002] After the recirculating ball steering gear completes its high-pressure break-in performance test, a large amount of oil remains inside. This oil needs to be drained after the test. The conventional sealing solution for the recirculating ball steering gear's drain hole is as follows: [Structure composition as follows...] Figure 1 As shown: Straight threaded bolt + O-ring rubber seal; Installation method: After the bolt is screwed into the drain hole, the seal is achieved by radial compression of the seal ring.

[0003] Existing straight thread bolt sealing structures are prone to sealing failure (such as oil seepage or leakage) under high pressure conditions; traditional sealing rings experience a decline in sealing performance due to material aging after long-term use, and the sealing rings are prone to hardening and cracking due to temperature / oil corrosion; there is a gap between the straight thread bolt and the oil drain hole, which cannot achieve uniform sealing in the entire circumference; and the gap in the straight thread leads to uneven distribution of sealing pressure. Utility Model Content

[0004] To solve the above problems, this utility model provides an alternative to the drain hole structure of a recirculating ball steering gear. It replaces the straight threaded bolt with a threaded bolt, and the double sealing mechanism of the bolt and the drain hole coated with sealant achieves a highly efficient sealing effect. The specific technical solution is as follows:

[0005] A sealing structure for the drain hole of a recirculating ball steering gear includes a drain hole and a drain bolt disposed in the drain hole of the recirculating ball steering gear. The drain hole is connected to the cavity of the recirculating ball steering gear. The drain bolt is connected to the drain hole of the recirculating ball steering gear by a tapered thread. The tapered thread parameters of the drain bolt plug are: thread angle 60°, pitch P=1.5mm, crest width 0.1P, and root radius R=0.15P.

[0006] Furthermore, it also includes applying sealant between the drain hole and drain bolt of the recirculating ball steering gear.

[0007] Furthermore, the taper of the drain bolt is 1:5-1:10, which can be adjusted to match different sizes of drain holes.

[0008] Furthermore, the sealant is a polyurethane sealant.

[0009] Furthermore, a sealing ring is provided between the nut of the drain bolt and the drain hole of the recirculating ball steering gear.

[0010] This invention employs a tapered thread to eliminate thread clearance and achieve surface contact sealing; simultaneously, it can retain a sealing ring to ensure sealing effectiveness. Alternatively, the sealing ring can be eliminated to improve durability. Attached Figure Description

[0011] Figure 1 Existing technology for sealing the drain hole of recirculating ball steering gear;

[0012] Figure 2 This utility model presents a schematic diagram of a tapered thread structure. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figure 2 As shown, a sealing structure for the drain hole of a recirculating ball steering gear includes a drain hole and a drain bolt. The drain hole is connected to the cavity of the recirculating ball steering gear. The drain bolt is connected to the drain hole with a tapered thread. The tapered thread parameters of the drain bolt are: thread angle 60°, pitch P = 1.5 mm, crest width 0.1P, and root radius R = 0.15P. The structure also includes applying sealant between the drain hole and the drain bolt. The taper of the drain bolt is 1:5-1:10; in this embodiment, 1:5.7 is used. The sealant is polyurethane sealant. A sealing ring is provided between the nut of the drain bolt and the drain hole of the recirculating ball steering gear.

[0015] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A recirculating ball steering gear drain seal structure characterized by: It includes setting in circulating ball steering gear drain hole and drain bolt, the circulating ball steering gear drain hole is connected with circulating ball steering gear cavity, the drain bolt is connected with the taper thread cooperation connection of circulating ball steering gear drain hole, the taper thread parameter of drain bolt plug is tooth type angle 60 DEG, pitch P = 1.5 mm, tooth top width 0.1 P, tooth bottom arc transition radius R = 0.15 P.

2. A grease drain seal for a circulating ball steering gear as defined in claim 1 wherein: It also includes between the circulating ball steering gear drain hole and drain bolt coating sealant.

3. A grease drain seal for a circulating ball steering gear as defined in claim 1 wherein: The taper of the drain bolt is 1:5-1:

10.

4. A grease drain seal for a circulating ball steering gear as defined in claim 2 wherein: The sealant is polyurethane sealant.

5. A grease drain seal for a circulating ball steering gear as defined in claim 1 wherein: A sealing ring is arranged between the nut of the drain bolt and the circulating ball steering gear drain hole.

Images