A hydrodynamic torque converter of a press-fit structure

Abstract

The application discloses a hydraulic torque converter of a press-fitting structure, comprising a pump wheel assembly, a guide wheel assembly, a pump wheel thrust bearing, a turbine thrust bearing, a turbine assembly, a lock clutch assembly and a cover assembly; the cover assembly comprises a plurality of fixed block outer side portions, a plurality of fixed block inner side portions, a plurality of fixed block inner and outer side welds and a cover. The application provides an automobile hydraulic torque converter, which has the characteristics of simple structure, short manufacturing period in the function sample manufacturing stage of the hydraulic torque converter, and the fixed block and the cover are positioned and assembled through press fitting and are connected through gas shield welding. The thread strength of the design meets the requirements.

Description

Technical Field

[0001] This invention patent belongs to the field of automotive hydraulic torque converter technology, specifically a press-fit hydraulic torque converter. Background Technology

[0002] The torque converter is a key component in passenger cars using automatic transmissions such as AT and CVT. It smoothly transmits engine torque to the automatic transmission using fluid flow. Internally, the torque converter consists of multiple parts filled with automatic transmission fluid and is installed between the engine and the automatic transmission. Currently, passenger cars widely use single-stage, two-phase, three-element lock-up integrated torque converters, consisting of a pump impeller assembly, turbine assembly, stator assembly, cover assembly, and lock-up clutch assembly. The pump impeller assembly is the driving component, fixedly connected to the cover assembly and then to the flywheel. It converts mechanical energy into hydraulic energy, guiding the fluid to impact the turbine blades, causing them to rotate and drive the turbine assembly, thus converting hydraulic energy into mechanical energy. The turbine assembly is the driven component, connected to the transmission input shaft. The stator, located between the two impellers, is fixed to the automatic transmission oil pump cover via a one-way clutch and a stator bushing. The lock-up clutch is installed between the cover assembly and the turbine assembly.

[0003] In existing hydraulic torque converters, the fixing block on the cover assembly is threadedly connected to the flywheel, and the fixing block and cover are connected by gas shielded welding. The positional accuracy of the threaded hole on the fixing block is ensured by a welding fixture. At the functional prototype stage of the hydraulic torque converter, the existing design requires the fabrication of a special welding fixture for the fixing block. The design and fabrication of this fixture are complex and time-consuming, resulting in a long production cycle for the functional prototype of the hydraulic torque converter.

[0004] In existing hydraulic torque converters, the mounting block on the cover assembly is threadedly connected to the flywheel, and the mounting block and cover are designed as a single unit. The positional accuracy of the threaded holes on the mounting block is ensured by machining. Since the hydraulic torque converter needs to transmit engine torque, performance verification requires testing during the functional prototype stage. However, the designed threads have not undergone heat treatment, and their strength does not meet the requirements. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing welded structures for hydraulic torque converter cover assembly fixing blocks by providing an automotive hydraulic torque converter.

[0006] The technical solution adopted to achieve the purpose of this invention is as follows: a hydraulic torque converter with a press-fit structure, comprising: a pump wheel assembly, a guide wheel assembly, a pump wheel thrust bearing, a turbine thrust bearing, a turbine assembly, a lock-up clutch assembly, and a cover assembly.

[0007] The cover assembly includes several outer portions of the fixing blocks, several inner portions of the fixing blocks, several inner and outer welds of the fixing blocks, and the cover.

[0008] The outer part of the fixing block is a rectangular block with a threaded hole in the center and a chamfer I at the opening of the threaded hole.

[0009] The outer portion of the fixing block is fixed to the outside of the cover.

[0010] The inner part of the fixing block is a cylinder, and the outer diameter end face of the cylinder is chamfered II.

[0011] The outer diameter of the inner part of the fixing block and the threaded hole of the outer part of the fixing block are interference-fitted.

[0012] The inner part of the fixing block is fixed to the outer part of the fixing block by press fitting.

[0013] The welds on the inner and outer sides of the fixing block are located between chamfer I on the outer side of the fixing block and chamfer II on the inner side of the fixing block.

[0014] Furthermore, the outer diameter of the inner part of the fixing block is press-fitted to the outer part of the fixing block using gas shielded welding.

[0015] Furthermore, the connection between the outer part of the fixing block and the cover can be either an integral connection or a separate connection.

[0016] The technical advantages of this invention are undeniable. This invention provides an automotive hydraulic torque converter with a simple structure; the fixing block and cover are positioned by press fitting and then connected by gas-shielded welding. It also features a short manufacturing cycle during the production of functional prototype hydraulic torque converters. Furthermore, the thread strength designed in this invention meets the requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of an existing automotive hydraulic torque converter;

[0019] Figure 3 This is a structural schematic diagram of the existing cover assembly;

[0020] Figure 4 This is a schematic diagram of the cover assembly of the present invention;

[0021] Figure 5 This is an exploded view of the cover assembly of the present invention;

[0022] In the diagram: 1. Pump wheel assembly; 2. Guide wheel assembly; 3. Pump wheel thrust bearing; 4. Turbine thrust bearing; 5. Turbine assembly; 6. Locking clutch assembly; 7. Cover assembly; 7-1. Outer part of the fixing block; 7-2. Inner part of the fixing block; 7-3. Inner and outer welds of the fixing block; 7-4. Cover. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0024] Example 1:

[0025] See Figures 1 to 5 A press-fit hydraulic torque converter includes: a pump wheel assembly 1, a guide wheel assembly 2, a pump wheel thrust bearing 3, a turbine thrust bearing 4, a turbine assembly 5, a lock-up clutch assembly 6, and a cover assembly 7.

[0026] The cover assembly 7 includes several outer portions 7-1 of the fixing blocks, several inner portions 7-2 of the fixing blocks, several inner and outer welds 7-3 of the fixing blocks, and a cover 7-4.

[0027] The outer part 7-1 of the fixing block is a rectangular block with a threaded hole in the center and a chamfer I at the opening of the threaded hole.

[0028] The outer portion 7-1 of the fixing block is fixed to the outside of the cover 7-4.

[0029] The inner part 7-2 of the fixing block is a cylinder, and the outer diameter end face of the cylinder is chamfered II.

[0030] The outer diameter of the inner portion 7-2 of the fixing block and the threaded hole of the outer portion 7-1 of the fixing block are interference-fitted.

[0031] The inner portion 7-2 of the fixing block is press-fitted to the outer portion 7-1 of the fixing block.

[0032] The inner and outer welds 7-3 of the fixing block are located between chamfer I of the outer part 7-1 of the fixing block and chamfer II of the inner part 7-2 of the fixing block.

[0033] The outer portion 7-1 of the fixing block is fixed to the outer side of the cover 7-4 by a universal machining method.

[0034] The inner part 7-2 of the fixing block is press-fitted to the outer part 7-1 of the fixing block by gas shielded welding at its outer diameter.

[0035] The connection between the outer part 7-1 of the fixing block and the cover 7-4 can be either an integral connection or a separate connection.

[0036] Example 2:

[0037] The purpose of this invention is to address the shortcomings of existing hydraulic torque converter cover assembly fixing block welding structures and to provide an automotive hydraulic torque converter with a simple structure. The fixing block and cover are assembled and positioned by press fitting and then connected by gas shielded welding, which has the characteristics of short production cycle in the manufacturing stage of hydraulic torque converter functional prototypes.

[0038] The technical solution of this invention is: an automotive hydraulic torque converter, mainly comprising a pump wheel assembly, a guide wheel assembly, a turbine assembly, a cover assembly, and a lock-up clutch assembly, etc. Its characteristic is that: the maximum outer diameter of the cover assembly is 240-290mm; the fixing block of the cover assembly is divided into inner and outer parts; the outer part of the fixing block is designed as an integral part with the cover of the cover assembly and can be machined using universal machining methods. The outer part of the fixing block has a hole with a diameter of 14-18mm at the center of the threaded hole; the depth of the hole is 9-15mm; the opening of the hole is chamfered, with an angle of 20-70 degrees between the chamfer and the end face of the fixing block; the chamfer depth is 2-5mm. The inner portion of the fixing block is a cylinder. The outer diameter of the cylinder is interference-fitted with the diameter of the hole at the center of the thread on the outer side of the fixing block, with an interference amount of 0.02–0.2 mm. The end face of the outer diameter of the cylinder has a chamfer, with an angle of 20–70 degrees between the chamfer and the end face of the fixing block, and the chamfer depth is 2–5 mm. The inner portion of the fixing block is press-fitted to the outer portion of the fixing block, and the connection at the outer diameter of the inner portion of the fixing block is achieved by gas shielded welding.

Claims

1. A press-fitted hydraulic torque converter, characterized in that, include: Pump wheel assembly (1), guide wheel assembly (2), pump wheel thrust bearing (3), turbine thrust bearing (4), turbine assembly (5), lock-up clutch assembly (6) and cover assembly (7). The cover assembly (7) includes a plurality of outer portions of fixing blocks (7-1), a plurality of inner portions of fixing blocks (7-2), a plurality of inner and outer welds of fixing blocks (7-3), and a cover (7-4); The outer part (7-1) of the fixing block is a rectangular block with a threaded hole in the center and a chamfer I at the opening of the threaded hole; The outer portion (7-1) of the fixing block is fixed to the outer side of the cover (7-4); The inner part (7-2) of the fixing block is a cylinder, and the outer diameter end face of the cylinder is provided with a chamfer II; The outer diameter of the inner part (7-2) of the fixing block and the threaded hole of the outer part (7-1) of the fixing block are interference-fitted; The inner part (7-2) of the fixing block is fixed to the outer part (7-1) of the fixing block by press fitting; The weld seam (7-3) on the inner and outer sides of the fixing block is located between chamfer I on the outer part (7-1) of the fixing block and chamfer II on the inner part (7-2) of the fixing block.

2. The hydraulic torque converter with a press-fit structure according to claim 1, characterized in that, The inner part (7-2) of the fixing block is press-fitted to the outer part (7-1) of the fixing block by gas shielded welding at the outer diameter.

3. The hydraulic torque converter with a press-fit structure according to claim 1, characterized in that, The connection between the outer part (7-1) of the fixing block and the cover (7-4) can be either integral or separate.

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