Circulating ball mechanical steering gear applied to 3.5-ton slight truck

Abstract

The recirculating ball mechanical steering gear comprises a steering gear shell, a screw and nut assembly and a swing arm assembly, the screw and nut assembly is connected with the swing arm assembly in a meshed mode and installed in a shell input cavity and a shell output cavity which are vertically distributed in the steering gear shell respectively, and the swing arm assembly is connected with the screw and nut assembly in a meshed mode. The transmission ratio of the steering gear is (17-22): 1, and the total number of turns of a steering wheel is 3.2-3.6. The transmission ratio of the steering gear and the total number of turns of the steering wheel are close to the number of turns of a car, driving experience is improved, and steering is more sensitive; the outer circulation design of each group is enhanced from 1.5 columns to 2.5 columns, and the bearing capacity is improved by about 43%; and a small-angle eccentric process is adopted, so that the steering follow-up performance of the middle position and the adjustability of the two sides after abrasion are ensured, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to a recirculating ball mechanical steering gear, in particular to a recirculating ball mechanical steering gear applied to a 3.5-ton light truck. Background Art

[0002] With the development of society, small and light trucks with a total mass of ≤3.5 tons have become the first choice for the "last mile" of urban logistics. However, the small and light trucks on the market currently have problems such as many steering wheel turns and insensitive steering. When matched with the electric column (EPS), there is a large input torque resulting in large steering gear wear gap. The market urgently needs to develop a recirculating ball steering gear with fewer turns and higher reliability. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in view of the defects of the prior art, a recirculating ball mechanical steering device applied to 3.5-ton light trucks is provided.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] A recirculating ball mechanical steering gear for use in 3.5-ton light trucks comprises a steering gear housing, a screw-nut assembly and a swing arm assembly, wherein the screw-nut assembly is meshedly connected with the swing arm assembly and respectively installed in a housing input cavity and a housing output cavity vertically distributed in the steering gear housing, the transmission ratio of the steering gear is 17-22:1, and the total number of steering wheel turns is 3.2-3.6 turns.

[0006] Preferably, a plug is provided in the oil filling hole at the top of the left end of the input cavity of the upper shell of the steering gear housing, and angular contact ball bearings are respectively provided at the front and rear ends of the input cavity of the housing.

[0007] Preferably, an input oil seal, a threaded cover and a locking nut which are coaxially arranged from the inside to the outside are provided at the left end entrance of the input cavity of the upper housing of the steering gear housing.

[0008] Preferably, the screw-nut assembly comprises a steering screw, a steering nut and two sets of ball guide tubes, wherein:

[0009] The steering nut is sleeved on the steering screw, and the two groups of ball guide tubes arranged thereon are both filled with a plurality of steel balls that circulate.

[0010] More preferably, the inlets and outlets at both ends of the ball guide tube are arranged tangentially to the spiral groove formed between the steering screw and the steering nut, thereby forming a circulating sealed pipeline.

[0011] More preferably, the axial spacing between the input ports at both ends of each group of the ball guide tubes is 2.5 rows of spiral grooves of the steering screw.

[0012] Preferably, the rocker arm assembly comprises a rocker arm shaft body, a rocker arm shaft sector tooth and a drop arm, wherein:

[0013] One end of the rocker arm shaft body is connected to the rocker arm shaft sector tooth, and the other end is fixedly connected to the vertical arm by a locking nut, and the rocker arm shaft sector tooth is meshedly connected to the steering nut.

[0014] More preferably, the rocker arm shaft sector teeth consist of 5 gears, and the pressure angle between the gears and the rack at the bottom of the steering nut is 27°.

[0015] More preferably, both left and right ends of the rocker arm shaft body are installed in the housing output cavity of the steering gear housing by using a first needle roller bearing and a second needle roller bearing.

[0016] More preferably, one end of the rocker arm shaft body is installed at the outlet of the output cavity of the housing through a side cover and an adjustment screw using a locking nut, and the middle part of the other end is sealed and installed at the inlet of the output cavity of the housing using an output oil seal.

[0017] The utility model adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0018] (1) The steering gear ratio of light trucks is reduced from 26.5 to 19, and the total number of steering wheel turns is reduced from 5.0 to 3.6, which is close to the number of turns of sedans, improving the driving experience and making the steering more sensitive;

[0019] (2) The design was improved from intersecting ducts to tangent ducts to improve the smoothness of the rolling of the steel balls; and the external circulation design of each of the two groups was strengthened from 1.5 rows to 2.5 rows, and the load-bearing capacity was increased by about 43%;

[0020] (3) The small-angle eccentricity process is adopted to ensure the follow-up performance of the steering in the middle position (small and no gap) and the adjustability after wear on both sides (no jamming during rotation), which prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a recirculating ball mechanical steering gear used in a 3.5-ton light truck according to the utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of a recirculating ball mechanical steering gear used in a 3.5-ton light truck according to the utility model;

[0023] Figure 3 This is a schematic diagram of the transverse cross-sectional structure of a recirculating ball mechanical steering gear used in a 3.5-ton light truck of the utility model;

[0024] Figure 4This is a left-side structural schematic diagram of a recirculating ball mechanical steering gear used in a 3.5-ton light truck according to the utility model;

[0025] Figure 5 This is a longitudinal cross-sectional structural diagram of a recirculating ball mechanical steering gear used in a 3.5-ton light truck of the utility model;

[0026] Figure 6 This is a schematic diagram of the assembly structure of a recirculating ball mechanical steering gear used in a 3.5-ton light truck. Figure 1 ;

[0027] Figure 7 This is a schematic diagram of the assembly structure of a recirculating ball mechanical steering gear used in a 3.5-ton light truck. Figure 2 ;

[0028] Figure 8 The utility model is a schematic structural diagram of a steering screw and a ball guide tube in a recirculating ball mechanical steering gear used for a 3.5-ton light truck. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0031] In some embodiments, Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, a recirculating ball mechanical steering gear for 3.5-ton light truck is provided. The steering gear mainly includes three parts: a steering gear housing 100, a screw nut assembly 200 and a swing arm assembly 300.

[0032] The screw nut assembly 200 is meshedly connected with the swing arm assembly 300, and is respectively installed in the vertically distributed housing input cavity and housing output cavity in the steering gear housing 100. The screw nut assembly 200 and the swing arm assembly 300 are in a cross-shaped upper and lower meshing connection structure.

[0033] To improve the driving experience of light trucks and make the steering more sensitive, the transmission ratio of the steering gear is 17-22:1, and the total number of steering wheel turns is 3.2-3.6 turns. Preferably, the steering is more sensitive. The transmission ratio of the steering gear is 19:1, and the total number of steering wheel turns is 3.6 turns, which is close to the number of turns of a car. The recirculating ball mechanical steering gear improves the driving experience and makes the steering more sensitive by reducing the steering gear transmission ratio of the light truck model from 26.5 to 19 and the total number of steering wheel turns from 5.0 to 3.6 turns, which is close to the number of turns of a car.

[0034] In some of the embodiments, Figure 3 , Figure 4 and Figure 6 As shown, a plug 101 is provided in the refueling hole at the top of the left end of the input cavity of the upper shell of the steering gear housing 100. The plug 101 is threadedly installed in the refueling hole with a sealing gasket to seal the refueling hole.

[0035] To ensure the rotation stability of the screw nut assembly 200 in the housing input cavity, angular contact ball bearings 102 are respectively provided at the front and rear ends of the housing input cavity. The front and rear angular contact ball bearings 102 are respectively sleeved and installed on the front and rear ends of the steering screw 201.

[0036] In addition, an input oil seal 103, a threaded cover 104 and a locking nut 105 are coaxially arranged from the inside to the outside at the left end entrance of the input cavity of the upper housing of the steering gear housing 100. The input oil seal 103 is sleeved on the front end of the steering screw 201 and is locked and fixed at the entrance of the housing input cavity by the threaded cover 104 and the locking nut 105.

[0037] In some of the embodiments, Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the screw-nut assembly 200 mainly includes a steering screw 201, a steering nut 202 and two sets of ball guide tubes 203. The steering nut 202 is sleeved on the steering screw 201, and the two sets of ball guide tubes 203 arranged thereon are filled with a plurality of circulating steel balls 204.

[0038] The inlets and outlets at both ends of the ball guide tube 203 are arranged tangentially to the spiral groove formed between the steering screw 201 and the steering nut 202, respectively, to form a circulating sealed pipeline filled with a plurality of steel balls 204 to support the steering screw 201.

[0039] In order to improve the smoothness of the rolling of the steel ball and the load-bearing capacity, the screw and nut assembly 200 adopts a design of two groups of external circulation tangent conduits in each group, and the axial spacing between the input ports at both ends of each group of the ball conduits 203 is 2.5 rows of spiral grooves of the steering screw 201. Compared with the traditional two groups of 1.5 rows of external circulation design, the recirculating ball mechanical steering gear strengthens the two groups of 1.5 rows to 2.5 rows of external circulation design, and the load-bearing capacity is increased by about 43%.

[0040] In some of the embodiments, Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the rocker arm assembly 300 mainly includes a rocker arm shaft body 301, a rocker arm shaft fan tooth 302 and a vertical arm 303, one end of the rocker arm shaft body 301 is connected to the rocker arm shaft fan tooth 302, and the other end is fixedly connected to the vertical arm 303 by a locking nut, and the rocker arm shaft fan tooth 302 is meshed with the steering nut 202.

[0041] Among them, the recirculating ball steering gear is a module 5 platform product based on the 65A electric column, so the rocker shaft sector teeth 302 are 5 gears, and the pressure angle between the gear and the bottom rack of the steering nut 202 is 27°. The rocker shaft sector teeth adopt a small-angle eccentric process to ensure the follow-up of the steering in the middle position (small and no gap) and the adjustability after wear on both sides (no jamming during rotation).

[0042] In order to replace the traditional bushing support method, improve the transmission efficiency of the steering gear and reduce torque fluctuations, the left and right ends of the rocker shaft body 301 are installed in the housing output cavity of the steering gear housing 100 using a first needle bearing 304 and a second needle bearing 305.

[0043] In addition, one end of the rocker shaft body 301 is installed at the outlet of the housing output cavity by a locking nut through a side cover 306 and an adjustment screw 307, and the middle of the other end is sealed and installed at the inlet of the housing output cavity by an output oil seal 308.

[0044] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0045] Secondly, the drawings of the embodiments disclosed in the present utility model only involve structures related to the embodiments disclosed in the present utility model, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0046] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A recirculating ball mechanical steering gear for 3.5 ton light trucks, characterized in that: It includes a steering gear housing, a screw nut assembly and a swing arm assembly, wherein: the screw nut assembly is meshed and connected with the swing arm assembly, and is respectively installed in a housing input cavity and a housing output cavity vertically distributed in the steering gear housing, the transmission ratio of the steering gear is 17-22:1, and the total number of steering wheel turns is 3.2-3.6 turns.

2. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 1 is characterized in that: A plug is arranged in the oil filling hole at the top of the left end of the input cavity of the upper shell of the steering gear housing, and angular contact ball bearings are arranged at the front and rear ends of the input cavity of the housing respectively.

3. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 1 is characterized in that: An input oil seal, a threaded cover and a locking nut which are coaxially arranged from inside to outside are arranged at the left end entrance of the input cavity of the upper shell of the steering gear shell.

4. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 1 is characterized in that: The screw and nut assembly includes a steering screw, a steering nut and two sets of ball guide tubes, wherein: The steering nut is sleeved on the steering screw, and the two groups of ball guide tubes arranged thereon are both filled with a plurality of steel balls that circulate.

5. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 4 is characterized in that: The inlets and outlets at both ends of the ball guide tube are arranged tangentially to the spiral groove formed between the steering screw and the steering nut, thereby forming a circulating sealed pipeline.

6. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 4 is characterized in that: The axial spacing between the input ports at both ends of each group of the ball guide tubes is 2.5 rows of spiral grooves of the steering screw.

7. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 4 is characterized in that: The rocker arm assembly includes a rocker arm shaft body, a rocker arm shaft sector gear and a drop arm, wherein: One end of the rocker arm shaft body is connected to the rocker arm shaft sector tooth, and the other end is fixedly connected to the vertical arm by a locking nut, and the rocker arm shaft sector tooth is meshedly connected to the steering nut.

8. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 7 is characterized in that: The rocker arm shaft sector teeth consist of 5 gears, and the pressure angle between the gears and the rack at the bottom of the steering nut is 27°.

9. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 7 is characterized in that: The left and right ends of the rocker shaft body are both installed in the housing output cavity of the steering gear housing by using a first needle bearing and a second needle bearing.

10. The recirculating ball mechanical steering gear for 3.5 ton light truck according to claim 7, characterized in that: One end of the rocker shaft body is installed at the outlet of the housing output cavity by a locking nut through a side cover and an adjusting screw, and the middle part of the other end is sealed and installed at the inlet of the housing output cavity by an output oil seal.

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