A gear shift shaft of a transmission

Abstract

The utility model discloses a shift shaft of a transmission, comprising a main shaft, the outer wall of the main shaft is evenly provided with six keyways arranged along the length direction thereof, one end of the keyway passes through the end face of the main shaft, six splines are formed between the six keyways, the outer wall of the spline is provided with a groove arranged along the length direction thereof, and a reinforcing steel bar is embedded in the groove. The utility model has the following advantages and effects: by arranging a reinforcing steel bar in each spline, the steel clamping treatment of the spline is realized, the structural strength of the spline is enhanced, deformation due to torsion is prevented, the stability when connected with the gear and working is ensured, and the service life of the shift shaft is improved.

Description

Technical Field

[0001] The utility model relates to the field of transmissions, in particular to a shift shaft of a transmission. Background Art

[0002] The transmission changes speed by switching gears on the main shaft. Generally, the shift shaft and gears of the transmission are fixed with hexagonal splines.

[0003] Since the torque between the hexagonal spline and the gear can easily cause the hexagonal spline to deform, the connection between the two will no longer be firm after long-term use, which can easily cause inaccurate gear switching, reduce the stability of the transmission shift shaft, and shorten the service life of the transmission shift shaft. This needs to be improved. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a shift shaft of a transmission, which has the effect of improving stability and service life.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions: a shift shaft of a transmission, including a main shaft, the outer wall of the main shaft is evenly provided with six key grooves arranged along its length direction, one end of the key groove passes through the end face of the main shaft, six splines are formed between the six key grooves, the outer wall of the spline is provided with a groove arranged along its length direction, and a reinforcing steel bar is embedded in the groove.

[0006] By adopting the above technical solution, by setting a reinforcing steel bar in each spline, the spline is clamped with steel, the structural strength of the spline is enhanced, deformation due to torque is prevented, the stability during connection and operation with the gear is ensured, and the service life of the shift shaft is increased.

[0007] In a preferred example, the utility model can be further configured as follows: both side outer walls of the reinforcing steel bar are provided with clamping strips arranged along the length direction thereof, and both side inner walls of the key slot are provided with clamping grooves for the clamping strips to be embedded in.

[0008] By adopting the above technical solution, by setting the cooperation between the clamping strip and the clamping groove, the automatic fixation of the reinforcing steel bar after being pressed in can be achieved, and at the same time, the interference fit method can increase the stability after installation.

[0009] In a preferred example, the utility model can be further configured as follows: the reinforcing steel bar and the clamping bar are integrally formed and made of manganese steel.

[0010] By adopting the above technical solution, since manganese steel is a high-strength steel that can effectively cope with harsh working conditions such as impact, extrusion and material wear of the workpiece, the structural strength and stability of the spline can be increased.

[0011] In a preferred example, the present invention can be further configured as follows: the sealing end of the keyway is arranged at an inclined surface and extends to the surface of the main shaft.

[0012] By adopting the above technical solution and setting the tail end of the keyway as a bevel, the structural strength of the spline root position can be increased to prevent breakage, ensure stability when connected to the gear and working, and at the same time increase the service life of the shift shaft.

[0013] In a preferred example, the present invention can be further configured as follows: the end of the spline located at the open end of the keyway is provided with a 45° chamfer.

[0014] By adopting the above technical solution and setting the chamfer, the sleeve installation process of the gear is made easier and more convenient.

[0015] In a preferred example, the utility model can be further configured as follows: an outer wall of the main shaft close to the keyway sealing end is provided with an oil groove, and a connecting groove connecting the oil groove and the keyway is provided on the main shaft.

[0016] By adopting the above technical solution and arranging the oil groove and the connecting groove in cooperation, the lubricating oil is introduced into the keyway along the connecting groove, thereby increasing the lubrication degree and ensuring the smooth operation of the workpiece.

[0017] In a preferred example, the utility model can be further configured as follows: six oil grooves are provided, and they correspond to the key grooves respectively, and the oil groove includes three transverse grooves and one vertical groove, and the vertical groove is connected to the middle positions of the three transverse grooves and connected to the connecting groove.

[0018] By adopting the above technical solution, by setting oil grooves corresponding to each keyway, stable replenishment of lubricating oil at each keyway position is achieved. At the same time, a W-shaped oil groove is set to guide the lubricating oil into the keyway as much as possible to ensure smooth operation of the workpiece.

[0019] In a preferred example, the utility model can be further configured as follows: a countersunk oil hole is provided at the intersection of the vertical groove and the middlemost horizontal groove.

[0020] By adopting the above technical solution and providing the countersunk oil hole, the oil tank can store as much lubricating oil as possible, thereby achieving sufficient replenishment of the lubricating oil and ensuring smooth operation of the workpiece.

[0021] In summary, the utility model has the following beneficial effects:

[0022] 1. By setting a reinforcing steel bar in each spline, the spline is clamped with steel to enhance the structural strength of the spline, prevent deformation due to torque, ensure stability when connected to the gear and working, and at the same time increase the service life of the shift shaft;

[0023] 2. By setting the combination of the card strip and the card slot, the automatic fixation of the reinforced steel strip after pressing in can be achieved, and the interference fit method can increase the stability after installation;

[0024] 3. By setting the oil groove and the connecting groove, the lubricating oil is introduced into the keyway along the connecting groove to increase the lubrication degree and ensure the smooth operation of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment;

[0026] Figure 2 Schematic diagram of the structure of the reinforcing steel bar of the embodiment.

[0027] Figure numerals: 1, main shaft; 2, keyway; 3, spline; 4, groove; 5, reinforcing steel bar; 6, clamping bar; 7, clamping groove; 8, oil groove; 81, horizontal groove; 82, vertical groove; 83, countersunk oil hole; 9, connecting groove. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1 , Figure 2 As shown, a shift shaft of a transmission includes a main shaft 1, an outer wall of the main shaft 1 is evenly provided with six key grooves 2 arranged along its length direction, one end of the key groove 2 passes through the end face of the main shaft 1, and six splines 3 are formed between the six key grooves 2.

[0030] like Figure 1 , Figure 2 As shown, the sealing end of the keyway 2 is set as an inclined surface and extends to the surface of the main shaft 1. By setting the tail end of the keyway 2 as an inclined surface, the structural strength of the root position of the spline 3 can be increased to prevent breakage, ensure stability when connected to the gear and working, and at the same time improve the service life of the shift shaft.

[0031] like Figure 1 , Figure 2 As shown, the end of the spline 3 located at the open end of the keyway 2 is provided with a 45° chamfer, so by providing the chamfer, the sleeve installation process of the gear is made easier and more convenient.

[0032] like Figure 1 , Figure 2 As shown, the outer wall of the spline 3 is provided with a groove 4 arranged along its length direction, and a reinforcing steel bar 5 is embedded in the groove 4 to realize the steel clamping treatment of the spline 3, enhance the structural strength of the spline 3, prevent deformation caused by torsion, ensure stability when connected to the gear and working, and at the same time improve the service life of the shift shaft.

[0033] As Figure 1 , Figure 2 shown, clamping strips 6 are arranged on both outer walls of the reinforcing steel bar 5 along its length direction, and clamping grooves 7 for the clamping strips 6 to be embedded are arranged on both inner walls of the keyway 2. Therefore, through the cooperation of the clamping strips 6 and the clamping grooves 7, the automatic fixation after the reinforcing steel bar 5 is pressed in is realized, and the interference fit method can increase the stability after installation.

[0034] As Figure 1 , Figure 2 shown, the reinforcing steel bar 5 and the clamping strip 6 are integrally formed to increase the structural strength of the two. The materials of the reinforcing steel bar 5 and the clamping strip 6 are manganese steel. Since manganese steel is a high-strength steel, it can effectively cope with harsh working conditions such as the impact, extrusion and material wear of workpieces. Therefore, it can increase the structural strength and service stability of the spline 3.

[0035] When machining the shift shaft, first machine the groove 4 and the clamping groove 7, then embed the reinforcing steel bar 5 into the groove 4, and then machine the keyway 2 to ensure that the dimensions of each machined keyway 2 and spline 3 are the same.

[0036] As Figure 1 shown, an oil groove 8 is arranged on the outer wall of the main shaft 1 near the sealing end of the keyway 2. There are six oil grooves 8, which respectively correspond to the keyways 2, and a connecting groove 9 connecting the oil groove 8 and the keyway 2 is arranged on the main shaft 1.

[0037] Therefore, through the cooperation of the oil groove 8 and the connecting groove 9, the lubricating oil is introduced into the keyway 2 along the connecting groove 9 to increase the lubrication degree and ensure the smooth operation of the workpiece. At the same time, each oil groove 8 respectively corresponds to the oil groove 8 of each keyway 2 to realize the stable replenishment of the lubricating oil at the position of each keyway 2.

[0038] As Figure 1 shown, the oil groove 8 includes three transverse grooves 81 and one vertical groove 82. The vertical groove 82 communicates with the middle positions of the three transverse grooves 81 and communicates with the connecting groove 9. Therefore, by arranging the king-shaped oil groove 8, the lubricating oil is introduced into the keyway 2 as much as possible to ensure the smooth operation of the workpiece.

[0039] As Figure 1 shown, a counterbore oil hole 83 is arranged at the intersection position of the vertical groove 82 and the middlemost transverse groove 81, so that the oil groove 8 can store as much lubricating oil as possible to realize the full replenishment of the lubricating oil and ensure the smooth operation of the workpiece.

[0040] The specific embodiments are only explanations of the present invention, and they are not limitations of the present invention. Those skilled in the art can make modifications without creative contributions to the embodiments according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A shift shaft of a transmission, characterized in that: The invention comprises a main shaft (1), the outer wall of the main shaft (1) is evenly provided with six keyways (2) arranged along the length direction thereof, one end of each keyway (2) passes through the end face of the main shaft (1), six splines (3) are formed between the six keyways (2), the outer wall of the spline (3) is provided with a groove (4) arranged along the length direction thereof, and a reinforcing steel bar (5) is embedded in the groove (4).

2. A shift shaft of a transmission according to claim 1, characterized in that: The outer walls on both sides of the reinforcing steel bar (5) are provided with clamping strips (6) arranged along the length direction thereof, and the inner walls on both sides of the key slot (2) are provided with clamping grooves (7) for the clamping strips (6) to be embedded.

3. A shift shaft of a transmission according to claim 2, characterized in that: The reinforcing steel strip (5) and the clamping strip (6) are integrally formed and made of manganese steel.

4. The shift shaft of a transmission according to claim 1, characterized in that: The sealing end of the keyway (2) is arranged at an inclined surface and extends to the surface of the main shaft (1).

5. A shift shaft of a transmission according to claim 4, characterized in that: The end of the spline (3) located at the open end of the keyway (2) is provided with a 45° chamfer.

6. The shift shaft of a transmission according to claim 1, characterized in that: An oil groove (8) is provided on the outer wall of the main shaft (1) close to the sealing end of the keyway (2), and a connecting groove (9) connecting the oil groove (8) and the keyway (2) is provided on the main shaft (1).

7. A shift shaft of a transmission according to claim 6, characterized in that: Six oil grooves (8) are provided and correspond to the key grooves (2) respectively. The oil groove (8) comprises three transverse grooves (81) and one vertical groove (82). The vertical groove (82) is connected to the middle positions of the three transverse grooves (81) and is connected to the connecting groove (9).

8. The shift shaft of a transmission according to claim 7, characterized in that: A countersunk oil hole (83) is provided at the intersection of the vertical groove (82) and the middlemost transverse groove (81).

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