Gear shifting dog tooth transmission structure

Abstract

The utility model provides a gear shifting dog tooth transmission structure which comprises a gear position gear, a sliding block and a gear shifting shaft sleeve, and transmission dog teeth and first oil guide grooves with inclined faces are distributed at one end of the gear position gear in a staggered mode along the circumference. Gear shifting dog teeth and second oil guide grooves with inclined planes are arranged at the two ends of the gear shifting shaft sleeve in a staggered mode along the circumference, one end of the gear shifting gear is connected with any end of the gear shifting shaft sleeve, the transmission dog teeth correspond to the gear shifting dog teeth, and the first oil guide grooves correspond to the second oil guide grooves; a shaft sleeve sliding groove is formed in the peripheral side of the gear shifting shaft sleeve, the sliding block slides in the shaft sleeve sliding groove through a limiting block on the peripheral side, a ship-shaped friction block is arranged at the end, close to the shaft sleeve sliding groove, of the sliding block, the two ends of the ship-shaped friction block are provided with a front guide cone and a rear guide cone respectively, and an oil guide hole communicated with the shaft sleeve sliding groove is formed in the oblique angle of the tail end of the second oil guide groove. A novel dog tooth gear shifting structure which is high in bearing capacity, low in abrasion and small in impact is constructed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gear shifting mechanism of gearbox, especially relates to a gear shifting dog gear transmission structure. BACKGROUND

[0002] Dog gear shifting mechanism is commonly used in the gear shifting mechanism of automobile gearbox, which has the advantages of simple and reliable structure, fast gear shifting response and low cost.

[0003] However, the contact area of the two components of the friction pair used for decoupling rotation and translation in the mechanism is obviously different, which makes the wear problem of the slider with small contact surface area more prominent, and it is one of the common causes of gear shifting failure. In addition, the mechanism has the transmission characteristics of instantaneous decoupling and connection of power during gear shifting, so the prominent gear shifting impact is another disadvantage.

[0004] Therefore, how to reduce the wear degree of the slider, reduce the gear shifting impact and improve the carrying capacity of the dog gear transmission is the current problem. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the prior art, the utility model provides a gear shifting dog gear transmission structure to solve the technical problem of how to reduce the wear degree of the slider, reduce the gear shifting impact and improve the carrying capacity of the dog gear transmission in the related art.

[0006] The utility model provides a gear shifting dog gear transmission structure, including gear position gear, slider and gear shifting shaft sleeve, the one end of gear position gear is staggered and is provided with transmission dog tooth and first oil guide groove with inclined plane along the circumference distribution, two ends of gear shifting shaft sleeve all are equipped with gear shifting dog tooth and second oil guide groove with inclined plane along the circumference distribution staggered, the one end of gear position gear is connected with the arbitrary one end of gear shifting shaft sleeve, and transmission dog tooth corresponds gear shifting dog tooth, first oil guide groove corresponds second oil guide groove.

[0007] The side of gear shifting shaft sleeve is equipped with shaft sleeve sliding groove, the slider is slid in shaft sleeve sliding groove through the limiting block of side, and the one end of slider close to shaft sleeve sliding groove is equipped with boat-shaped friction block, both ends of boat-shaped friction block are equipped as front guide cone and rear guide cone respectively, and the tail end of second oil guide groove is equipped with oil guide hole connected with shaft sleeve sliding groove.

[0008] Optionally, when transmission dog tooth corresponds gear shifting dog tooth, and first oil guide groove corresponds second oil guide groove, it further includes:

[0009] The oblique angle extension line of the tail end inclination angle of first oil guide groove passes through second oil guide groove.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] Under the premise of ensuring the strength of dog gear transmission, the oil flow scheme is further matched, the independent oil guide structures are integrated and matched into a dynamic lubrication system, and the design with dispersed impact cone surface is matched, so that a new dog gear shifting structure with high bearing capacity, low wear and small impact is constructed. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is an overall combined structure schematic diagram of the utility model;

[0013] Figure 2 It is an arbitrary end structure schematic diagram of the shifting shaft sleeve in the utility model;

[0014] Figure 3 It is a plane structure schematic diagram of the shifting shaft sleeve in the utility model;

[0015] Figure 4 It is an end structure schematic diagram of the gear in the utility model;

[0016] Figure 5 It is a plane structure schematic diagram of the gear in the utility model;

[0017] Figure 6 It is a plane structure schematic diagram of the sliding block in the utility model;

[0018] Figure 7 It is a bottom structure schematic diagram of the sliding block in the utility model;

[0019] Figure 8 It is a bottom structure schematic diagram of the sliding block in the utility model;

[0020] Figure 9 It is a side view combined structure schematic diagram in the utility model;

[0021] Figure 10 It is a plane view combined structure schematic diagram in the utility model.

[0022] Explanation of reference numerals:

[0023] 1, gear; 2, shifting shaft sleeve; 3, sliding block; 101, transmission dog gear; 102, first oil guide groove; 201, shifting dog gear; 202, second oil guide groove; 203, shaft sleeve sliding groove; 204, oil guide hole; 301, boat-shaped friction block; 302, front guide cone; 303, rear guide cone; 304, front wing; 305, rear wing; 306, left wing; 307, right wing; 308, friction contact surface.

[0024] The implementation, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and beneficial effects of the utility model clearer and more understandable, the technical scheme in the utility model is further explained below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.

[0026] Referring to Figure 1 - Figure 6 and Figure 9 The utility model provides a kind of shift dog tooth 201 transmission structure, including gear 1, slider 3 and shift shaft sleeve 2, the gear 1 one end is along the circumferential distribution staggered and provided with transmission dog tooth 101 and with the first oil guide groove 102 of inclined surface, the shift shaft sleeve 2 both ends are provided with along the circumferential distribution staggered and provided with shift dog tooth 201 and with the second oil guide groove 202 of inclined surface, the gear 1 one end is connected with the arbitrary one end of the shift shaft sleeve 2, and the transmission dog tooth 101 corresponds the shift dog tooth 201, the first oil guide groove 102 corresponds the second oil guide groove 202;

[0027] The circumferential side of the shift shaft sleeve 2 is equipped with shaft sleeve sliding groove 203, the slider 3 is slid in the shaft sleeve sliding groove 203 by circumferential side limit block, and the slider 3 one end close to the shaft sleeve sliding groove 203 is equipped with boat-shaped friction block 301, the both ends of the boat-shaped friction block 301 are equipped with front guide cone 302 and rear guide cone 303 respectively, and the tail end of the second oil guide groove 202 is equipped with oil guide hole 204 that is connected with the shaft sleeve sliding groove 203.

[0028] Referring to Figure 7 and Figure 8 In the embodiment, in the dynamic shift process, under the action of centrifugal force, lubricating oil flows along the second oil guide groove 202 on the shift shaft sleeve 2 along the circumferential direction and outward in radial direction quickly, and is accompanied by the improvement of circumferential direction speed;Similarly, the lubricating oil on the gear 1 also has similar movement characteristics, but different is that, when the lubricating oil moves to the tail end of the first oil guide groove 102 of the gear 1, due to the effect of the tail end angle, the lubricating oil will move along the direction of the inclined surface and separate from the first oil guide groove 102 of the gear 1 to the direction of the second oil guide groove 202 of the shift shaft sleeve 2, and finally meet with the lubricating oil in the second oil guide groove 202 of the shift shaft sleeve 2;

[0029] And because the tail end of the second oil guide groove 202 is provided with an oil guide hole 204 communicating with the shaft sleeve sliding groove 203, when rotating to the sliding block 3 position, the converged lubricating oil will enter the shaft sleeve sliding groove 203, a part of the lubricating oil will directly flow into the friction contact surface 308 position through the bottom edge chamfer of the sliding block 3, and the other part will flow into the friction contact surface 308 under the guide flow of the front wing 304 or the rear wing 305, the front guide cone 302 or the rear guide cone 303 of the limiting block. Because the oil flow entering the shaft sleeve sliding groove 203 has a certain objective circumferential velocity and radial velocity, there will be a certain oil flow impact force in the transition area between the front (or rear) guide cone surface of the boat-shaped friction block 301 and the friction contact surface 308 and the bottom edge chamfer area, and the shaft axial force is generated under the action of the chamfer or the guide cone, which is just opposite to the direction of the gear hanging force, so as to reduce the pressure of the friction surface, and the front wing 304 or the rear wing 305, the left wing 306 and the right wing 307 of the limiting block can also collect a part of the oil flow from the oil guide hole 204 at the end of the shaft sleeve oil guide groove and other positions, thereby further improving the lubricating effect.

[0030] In addition, because the sliding block 3 and the shaft sleeve friction surface adopt a conical surface matching design, part of the axial impact load from the shaft sleeve during gear shifting can be converted to the radial direction, so as to reduce the impact force. The structure realizes the improvement of the lubricating state of the friction pair under the condition of ensuring sufficient transmission strength, and disperses the impact energy through the conical surface contact form.

[0031] In another embodiment, when the transmission dog tooth 101 corresponds to the gear shifting dog tooth 201, and the first oil guide groove 102 corresponds to the second oil guide groove 202, the structure further comprises:

[0032] The oblique angle extension line of the tail end inclination angle of the first oil guide groove 102 passes through the second oil guide groove 202.

[0033] Referring to Figure 10 When the gear shifting dog tooth 201 of the gear shifting shaft sleeve 2 corresponds to the transmission dog tooth 101, and the second oil guide groove 202 aligns with the first oil guide groove 102, the oblique angle extension line of the tail end inclination angle θ of the first oil guide groove 102 passes through the second oil guide groove 202, which further ensures that the lubricating oil enters the shaft sleeve sliding groove 203.

[0034] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A shift dog gear structure, characterized by, The gear shift gear, the slider and the gear shift sleeve are included, the gear shift gear is provided with the transmission dog tooth and the first oil guide groove with the inclined surface which are staggered and distributed along the circumference at one end, the gear shift sleeve is provided with the gear shift dog tooth and the second oil guide groove with the inclined surface which are staggered and distributed along the circumference at both ends, one end of the gear shift gear is connected with any one end of the gear shift sleeve, the transmission dog tooth corresponds to the gear shift dog tooth, and the first oil guide groove corresponds to the second oil guide groove; The gear shift sleeve is provided with the sleeve sliding groove on the circumferential side, the slider is slid in the sleeve sliding groove through the limiting block on the circumferential side, the slider is provided with the boat-shaped friction block at one end close to the sleeve sliding groove, both ends of the boat-shaped friction block are respectively provided as the front guide cone and the rear guide cone, and the tail end inclined angle of the second oil guide groove is provided with the oil guide hole which is communicated with the sleeve sliding groove.

2. The shift dog gear structure of claim 1, wherein, When the transmission dog tooth corresponds to the gear shift dog tooth and the first oil guide groove corresponds to the second oil guide groove, further including: The inclined angle extension line of the tail end inclined angle of the first oil guide groove passes through the second oil guide groove.

Images